TWI866655B - Method of simulating human tissues’ electromagnetic wave absorption rate and electronic device thereof - Google Patents

Abstract

A method of simulating human tissues’ electromagnetic wave absorption rate and the electronic device thereof are provided. The method includes building a circuit model; according to a target human tissue, obtaining parameters of target cells, parameters of cell fluid, and the number of cells; and according to the circuit model, the parameters of cells, the parameters of cell fluid and the number of cells, determining a tissue resistance related to the electromagnetic wave absorption rate. The model includes multiple equivalent parallel plate circuits of cells and multiple equivalent parallel plate circuits of cell fluid. One of the equivalent parallel plate circuits of cell fluid connects a first one of the equivalent parallel plate circuits of cells to a second one of the equivalent parallel plate circuits of cells.

Description

A method for simulating the electromagnetic wave absorption rate of human tissue and an electronic device thereof

This disclosure relates to a method for simulating the electromagnetic wave absorption rate of human body tissue and an electronic device thereof.

With the rapid development of technology, people in daily life are using wireless communication devices more and more, such as smart phones and wearable devices. Ordinary people can no longer live without electromagnetic waves. However, since the human body is a material with high dielectric constant and high loss, there is an interaction between the human body and electromagnetic waves, and excessive electromagnetic waves may cause damage to the nervous system, such as headaches, dizziness, general weakness, memory loss, sleep disorders, etc.

SAR (Specific Absorption Rate) is the electromagnetic wave power absorbed or consumed by human tissue per unit weight. The SAR value can be used to determine whether the electromagnetic waves of smartphones or wearable devices are excessive, but the human body is a multi-layered tissue structure. However, there are currently few studies that simulate the electromagnetic wave absorption rate of multi-layered tissues in the human body.

This disclosure provides a method and electronic device for simulating the electromagnetic wave absorption rate of human tissue. The conductivity of tissues in different parts of the human body is also different, which results in different dielectric constants, and the electromagnetic wave absorption and loss of each tissue will also be different. By connecting multiple cell fluid parallel plate equivalent circuits with multiple cytoplasm parallel plate equivalent circuits to simulate different tissues of the human body, the correlation between the equivalent resistance of human tissue and the electromagnetic wave absorption rate is obtained, thereby exploring the electromagnetic wave absorption rate of the human body.

The present disclosure proposes a method for simulating the electromagnetic wave absorption rate of human tissue applicable to electronic devices, the method comprising establishing a circuit model, the model comprising a cell equivalent parallel plate circuit and a cell fluid equivalent parallel plate circuit, wherein the cell fluid equivalent parallel plate circuit connects the first cell equivalent parallel plate circuit to the second cell equivalent parallel plate circuit; obtaining cell parameters, cell fluid parameters and cell quantity according to the target human tissue; and determining tissue resistance related to the electromagnetic wave absorption rate according to the circuit model, cell parameters, cell fluid parameters and cell quantity.

According to one embodiment of the present disclosure, in the above method, the cytoplasm equivalent parallel plate circuit includes a first resistor and a first capacitor connected in parallel, and the cytosol equivalent parallel plate circuit includes a second resistor and a second capacitor connected in parallel.

According to one embodiment of the present disclosure, in the above method, the at least one cell parameter includes cell thickness, cell conductivity and cell dielectric constant, and the at least one cell fluid parameter includes cell fluid dielectric constant and cell fluid conductivity.

According to one embodiment of the present disclosure, the above method further includes sending a message based on the tissue resistance to notify personnel to adjust product parameters.

According to one embodiment of the present disclosure, in the above method, the first cytoplasm equivalent parallel plate circuit is connected in series with the third cytoplasm equivalent parallel plate circuit, and the second cytoplasm equivalent parallel plate circuit is connected in series with the fourth cytoplasm equivalent parallel plate circuit.

The present disclosure provides an electronic device for simulating the electromagnetic wave absorption rate of human tissue, including a memory for storing a plurality of instructions; a processor for executing the instructions to complete the following steps, the steps including establishing a circuit model, the model including a plurality of cytoplasm equivalent parallel plate circuits and a plurality of cytosol equivalent parallel plate circuits, wherein one of the cytosol equivalent parallel plate circuits is The first cytoplasm equivalent parallel plate circuit is connected to the second cytoplasm equivalent parallel plate circuit; at least one cell parameter, at least one cytosol parameter and a cell quantity are obtained according to a target human tissue; and the tissue resistance related to the electromagnetic wave absorption rate is determined according to the circuit model, the at least one cell parameter, the at least one cytosol parameter and the cell quantity.

According to one embodiment of the present disclosure, in the above-mentioned electronic device for electromagnetic wave absorption rate of human tissue, the cytoplasm equivalent parallel plate circuit includes a first resistor and a first capacitor connected in parallel, and the cell fluid equivalent parallel plate circuit includes a second resistor and a second capacitor connected in parallel.

According to one embodiment of the present disclosure, in the above-mentioned electronic device for electromagnetic wave absorption rate of human tissue, at least one cell parameter includes cell thickness, cell conductivity and cell dielectric constant, and at least one cell fluid parameter includes cell fluid dielectric constant and cell fluid conductivity.

According to one embodiment of the present disclosure, the electronic device for measuring electromagnetic wave absorption rate of human tissues, wherein the steps further include sending a message based on the tissue resistance to notify personnel to adjust product parameters.

According to one embodiment of the present disclosure, in the above-mentioned electronic device for electromagnetic wave absorption rate of human tissue, the first cytoplasm equivalent parallel plate circuit is used to connect to the third cytoplasm equivalent parallel plate circuit, and the second cytoplasm equivalent parallel plate circuit is used to connect to the fourth cytoplasm equivalent parallel plate circuit.

100:Methods

101, 102, 103, 104, 105, 106, 107: Steps

200: Single cell equivalent circuit model

2001: Cell membrane capacitance

2002: Cytoplasmic capacitance

2003: Cytoplasmic resistance

201: Single cell parallel plate circuit model

2011: Electric current

2012: Cell membrane

2013: Cytoplasm

2014: Cytoplasmic parallel plate resistance

2015: Cytoplasmic parallel plate capacitance

300: Single-layer tissue circuit model

301: Cell fluid equivalent parallel plate circuit

3011: Parallel plate resistance of cell fluid

3012: Parallel plate capacitance of cell fluid

302: Cytoplasmic equivalent parallel plate circuit

3021: Cytoplasmic parallel plate resistance

3022: Cytoplasmic parallel plate capacitance

400:Multi-layer organizational circuit model

500: Target organization

600: Skin tissue arrangement diagram

610: Fat tissue arrangement diagram

620: Muscle tissue arrangement diagram

6201:Myometrial cells

6202:Actin cells

6203:Myosin cells

630: Skeletal tissue arrangement diagram

6301: Trabecular cells

6302: Cortical bone cells

700:Hand simulation model

701: Hand size model

702: Hand structure model

7021: Hand skin tissue

7022: Hand fat tissue

7023:Hand muscle tissue

7024: Hand bone tissue

800: Head simulation model

801: Head size model

802: Head structure model

8021: Head skin tissue

8022: Head fat tissue

8023: Head bone tissue

900: Electronic devices

910: Processor

920: Memory

d _c : cytoplasm thickness

d _m : cell membrane thickness

d _t : thickness

d _t1 : length

d _hand , d _head : width

d _cell : length

S: cell spacing

FIG1 is a flow chart of a method for simulating the electromagnetic wave absorption rate of human tissue according to some embodiments of the present disclosure.

FIG2A is a simulation of a single cell circuit model according to some embodiments of the present disclosure.

FIG. 2B is a parallel plate circuit model simulating a single cell according to some embodiments of the present disclosure.

Figure 3 is a single circuit model according to some implementations of the present disclosure.

FIG4 is a multiple circuit model according to a partial implementation of the present disclosure.

FIG5 is a simulation diagram of a target organization according to some implementation methods of the present disclosure.

Figures 6A to 6D are cell arrangement diagrams of each target tissue according to some embodiments of the present disclosure.

FIG. 7A and FIG. 7B are diagrams showing the changes in resistance and electromagnetic wave absorption power of various human body tissues with respect to frequency according to some embodiments of the present disclosure.

FIG8 is a hand tissue simulation model according to an embodiment of the present disclosure.

FIG. 9 is a head tissue simulation model according to an embodiment of the present disclosure.

FIG10 is an electronic device according to a partial implementation of the present disclosure.

This disclosure establishes an equivalent circuit based on the physical structure and dielectric properties of a single cell, and simulates cells and cell fluid as equivalent planar circuits, wherein the cell fluid equivalent planar circuit serves as a connecting circuit between cells. Multiple cell equivalent planar circuits are connected in series through the cell fluid equivalent planar circuit to form a tissue, and the Advanced Design System (ADS) is used based on the 930MHz, 2.4GHz, and 5.8GHz frequency bands in the Industrial Scientific Medical Band (ISM Band) to simulate the absorption rate of electromagnetic waves in human tissues.

FIG1 is a flow chart of a method 100 for simulating electromagnetic wave absorption rate of human tissue according to some implementations, FIG2A is a single cell equivalent circuit model 200 according to some implementations, and FIG2B is a single cell parallel plate circuit model 201 according to some implementations. Referring to FIG. 1 , FIG. 2A , and FIG. 2B , the method 100 starts at step 101, wherein step 101 includes providing a single cell equivalent circuit model 200, including a cell membrane capacitance 2001, a cytoplasmic capacitance 2002, and a cytoplasmic resistance 2003, and converting the single cell equivalent circuit model 200 into a single cell parallel plate circuit model 201, wherein the cutoff frequency f ₀ can be calculated using the geometric parameters and material parameters of the cell, and the cutoff frequency f ₀ is used to convert the single cell equivalent circuit model 200 in FIG. 2A into the single cell parallel plate circuit model 201 in FIG. 2B , wherein the cell membrane 2012 of the single cell parallel plate circuit model 201 has a cell membrane thickness d _m , the cytoplasm 2013 has a cytoplasm thickness d _c .

其中：

在上式中，ω ₀為角共振頻率、σ _C為細胞質導電度、ε _m為細胞模介電常數、ε ₀為真空介電常數，藉由將細胞的幾何參數與材料參數帶入此公式，可獲得不同細胞各自對應的截止頻率，其結果記錄在表一中。 The calculation steps of f ₀ are described in formula (a):

in:

In the above formula, ω ₀ is the angular resonance frequency, σ _C is the cell mass conductivity, ε _m is the cell mode dielectric constant, and ε ₀ is the vacuum dielectric constant. By substituting the geometric parameters and material parameters of the cell into this formula, the cutoff frequencies corresponding to different cells can be obtained. The results are recorded in Table 1.

In some embodiments of the present disclosure, Table 1 provides cell parameters of different human tissue cells, including cell thickness d _m , cytoplasm thickness d _c , cell conductivity, cell dielectric constant, and the cutoff frequency corresponding to each human tissue cell, such as skin, muscle, fat, bone, etc., obtained according to formula (a). However, it should be noted that this should not limit the scope of the present embodiment. As shown in FIG. 2A , a single cell can be simulated as an RC circuit composed of a plurality of cell membrane capacitors 2001, a plurality of cytoplasm capacitors 2002, and a plurality of cytoplasm resistors 2003. From f ₀ recorded in Table 1, it can be seen that the cell is much larger than f ₀ in the 930 MHz, 2.4 GHz, and 5.8 GHz frequency bands of the ISM Band. Therefore, the current 2011 will penetrate the cell, and the cell can be simplified into a cube composed of a cell membrane 2012 and a cytoplasm 2013, and regarded as a single cell parallel plate circuit model 201, as shown in FIG. 2B .

FIG2B is a single cell parallel plate circuit model 201, which includes a connected cytoplasmic parallel plate resistor 2014 and a cytoplasmic parallel plate capacitor 2015, please refer to step 101 in FIG1 and FIG2B. After establishing the single cell parallel plate circuit model 201, the geometric parameters and material parameters of the cell can be used to enter formula (b) and formula (c) to obtain the resistance value of the cytoplasmic parallel plate resistor 2014 and the capacitance value of the cytoplasmic parallel plate capacitor 2015, wherein formula (b) and formula (c) are parallel plate capacitance formula and resistance formula respectively.

Formula (b) is described as follows: C _c =k ε ₀ ε _c d _cIn the above formula, C _c is the capacitance value of the cytoplasmic parallel plate capacitor, k is the dielectric constant, ε ₀ is the vacuum dielectric constant, and ε _c is the cytoplasmic dielectric constant. Because ε ₀ is a constant, formula (b) can be simplified to formula (b ₁ ), and formula (b ₁ ) is described as follows: C _c = ε _r d _cIn the above formula, ε _r is the cytoplasmic dielectric constant.

在上式中，R_c為細胞質平行板電容的電阻值，l為細胞立方體的長度、σ _s為細胞立方體的體積導電率、A為細胞立方體的面積。 The description of formula (c) is as follows:

In the above formula, R _c is the resistance value of the cytoplasmic parallel plate capacitor, l is the length of the cell cube, σ _s is the volume conductivity of the cell cube, and A is the area of the cell cube.

公式(c₁)中的R_c可由d_c及σ _s表示。 Since l and A can be expressed as d _c , formula (c) can be expressed as formula (c ₁ ). The description of formula (c ₁ ) is as follows:

R _c in formula (c ₁ ) can be expressed by d _c and σ _s .

因頻率的不同而細胞具有不同的導電率，因此可以藉由公式(b₁)及公式(c₂)得到單一細胞平行板電路模型201在不同頻率下的R_c與C_c，其結果記錄在表二及表三中。 Formula (c ₁ ) can be further simplified into formula (c ₂ ), which is described _as follows:

Since cells have different conductivities at different frequencies, R _c and C _c of the single cell parallel plate circuit model 201 at different frequencies can be obtained by using formula (b ₁ ) and formula (c ₂ ). The results are recorded in Table 2 and Table 3.

In some embodiments of the present disclosure, Table 2 and Table 3 provide the resistance, capacitance, and conductivity of different tissues of the human body, such as skin, muscle, fat, bone, etc., obtained according to formula (b ₁ ) and formula (c ₂ ) at the 930 MHz, 2.4 GHz, and 5.8 GHz frequency bands of the ISM Band. However, it should be noted that this should not limit the scope of the present embodiment. It can be seen from Table 2 and Table 3 that different conductivity can obtain different resistances, or different dielectric constants can obtain different capacitances.

Please refer to Table 2, which is a table of the resistance parameters of human tissue cells obtained from conductivity and size parameters. At the same frequency, the cell resistance is in the order of fat, bone, skin, and muscle. From formula (c ₂ ), we know that when the size parameter is a fixed value, that is, the cytoplasm thickness and surface area are fixed, the resistance is inversely proportional to the conductivity. The higher the conductivity, the lower the resistance. The water content of human cells can be analyzed here. Since the human body is composed of 70% water, cells with high water content will have higher cell conductivity, and cells with low water content will have lower cell conductivity. Therefore, it can be seen that the muscle cells have the highest water content, and the fat cells have the lowest water content.

Please refer to Table 3, which is a table of the capacitance parameters of human tissue cells obtained from the dielectric constant and size parameters. At the same frequency, the cell capacitance is in the order of muscle, skin, bone, and fat. From formula (b ₁ ), it can be seen that when the size parameter is a fixed value, that is, the cytoplasm thickness and surface area are fixed, the cell capacitance is proportional to the dielectric constant. The higher the dielectric constant, the greater the capacitance.

FIG3 is a single-layer tissue circuit model 300 according to some embodiments. Referring to FIG3 , the method proceeds to step 102. Step 102 includes establishing a single-layer tissue circuit model 300. The monolayer tissue circuit model 300 includes a cytosol equivalent parallel plate circuit 301 and a cytoplasm equivalent parallel plate circuit 302, wherein the cytosol equivalent parallel plate circuit 301 includes a cytosol parallel plate resistor 3011 and a cytosol parallel plate capacitor 3012 in parallel, and the cytosol equivalent parallel plate circuit 302 includes a cytosol parallel plate resistor 3021 and a cytosol parallel plate capacitor 3022 in parallel. In this embodiment, the cytosol equivalent parallel plate circuit 301 is used as a connection interface between cells to connect two cytosol equivalent parallel plate circuits 302 in series, wherein there is a cell spacing S between the cytosol equivalent parallel plate circuits 302. However, it should be noted that this should not limit the scope of this embodiment.

Please refer to FIG. 3 , wherein the resistance value of the cytoplasmic parallel plate resistor 3021 and the capacitance value of the cytoplasmic parallel plate capacitor 3022 can be obtained by using the above formula (b ₁ ) and formula (c ₂ ) and referring to the cell parameters (eg, size parameters, conductivity, and dielectric constant) in Tables 2 and 3 . The cell fluid equivalent parallel plate circuit 301 includes a cell fluid parallel plate resistor 3011 and a cell fluid parallel plate capacitor 3012, wherein the resistance value of the cell fluid parallel plate resistor 3011 and the capacitance value of the cell fluid parallel plate capacitor 3012 are obtained by using the following formula (d) and formula (e ₂ ) and referring to the cell fluid parameters (eg, cell fluid dielectric constant and cell fluid conductivity) recorded in Table 4.

In some embodiments of the present disclosure, Table 4 provides the dielectric constant and conductivity of the cell fluid at the 930MHz, 2.4GHz and 5.8GHz frequency bands of the ISM Band. It can be seen from Table 4 that the dielectric constant and conductivity of the cell fluid change slightly at different frequencies.

其中：A=d _c d _c 在上式中，C_i為細胞液平行板電容的電容值、A為細胞的表面積、ε ₀為細胞液介電常數、ε _r為相對介電常數。 The description of formula (d) is as follows:

Where: A= d _c d cIn the above formula, _Ci is the capacitance value of the cell fluid parallel plate capacitance, A is the surface area _of the cell, ε ₀ is the cell fluid dielectric constant, and ε _r is the relative dielectric constant.

在上式中，R_i為細胞液平行板電組的電阻值、A為細胞的表面積、l為細胞液的長度、σ為細胞液的體積導電率。因l與A可以S與C_i表示，公式(e)可為公式(e₁)，公式(e₁)的描述如下：

公式(e₁)中的R_i可由ε ₀、ε_r、C_i及σ表示。 The description of formula (e) is as follows:

In the above formula, _Ri is the resistance of the cell fluid parallel plate electrode, A is the surface area of the cell, l is the length of the cell fluid, and σ is the volume conductivity of the cell fluid. Since l and A can be represented by S and _Ci , formula (e) can be formula (e ₁ ), and the description of formula (e ₁ ) is as follows:

R _i in formula (e ₁ ) can be represented by ε ₀ , ε _r , C _i and σ .

並將表四中的細胞液參數帶入公式(d)及公式(e₂)中，可得到細胞液等效平行板電路301在不同頻率下的細胞液平行板電阻3011的電阻值與細胞液平行板電容3012的電容值，其結果記錄在表五及表六中。 Formula (e ₁ ) can be further simplified into formula (e ₂ ), which _is described as follows:

Substituting the cell fluid parameters in Table 4 into formula (d) and formula (e ₂ ), the resistance value of the cell fluid parallel plate resistor 3011 and the capacitance value of the cell fluid parallel plate capacitor 3012 of the cell fluid equivalent parallel plate circuit 301 at different frequencies can be obtained. The results are recorded in Tables 5 and 6.

In some embodiments of the present disclosure, Tables 5 and 6 provide the resistance and capacitance corresponding to the cell fluid of different human tissues, such as skin, muscle, fat, bone, etc., obtained according to formula (d) and formula (e ₂ ), where A/S is a size parameter. However, it should be noted that this should not limit the scope of the present embodiment.

Please refer to Table 5, which is a table of the resistance parameters of human tissue cell fluid. At the same frequency, the resistance of cell fluid is in the order of muscle, skin, fat, and bone. The surface area of each tissue cell can be analyzed by formula (e). From formula (e), it can be seen that the resistance of cell fluid is inversely proportional to the surface area of the cell. It can be seen that the resistance of muscle cell fluid is the largest, and the surface area of muscle cells is the smallest, while the resistance of bone cell fluid is the smallest, and the surface area of bone cells is the largest.

Please refer to Table 6, which is a table of capacitance parameters of human tissue cell fluid. At the same frequency, the capacitance of cell fluid is bone, fat, skin, and muscle in order. The surface area of each tissue cell can be analyzed by formula (d). From formula (d), it can be seen that the capacitance of cell fluid is proportional to the surface area of the cell. It can be seen that the capacitance of muscle cell fluid is the smallest, so the surface area of muscle cells is the smallest, and the capacitance of bone cell fluid is the largest, so the surface area of bone cells is the largest.

Please refer to FIG4 , method 100 comes to step 103, FIG4 is a multi-layer tissue circuit model 400 of some embodiments. The multi-layer tissue circuit model 400 includes a plurality of cytosol equivalent parallel plate circuits 301 and a plurality of cytoplasm equivalent parallel plate circuits 302, wherein the cytosol equivalent parallel plate circuit 301 includes a cytosol parallel plate resistor 3011 and a cytosol parallel plate capacitor 3012 connected in parallel, and the cytosol equivalent parallel plate circuit 302 includes a cytosol parallel plate resistor 3021 and a cytosol parallel plate capacitor 3022 connected in parallel. In this embodiment, multiple cytosol equivalent parallel plate circuits 301 are used as the connection interface between cells to connect multiple cytoplasm equivalent parallel plate circuits 302 in series, for example, the cytosol equivalent parallel plate circuit 301 connects the first and third of the multiple cytoplasm equivalent parallel plate circuits 302 in series, and the cytosol equivalent parallel plate circuit 301 connects the second and fourth of the multiple cytoplasm equivalent parallel plate circuits 302 in series.

FIG5 is a simulation diagram of a target tissue according to some embodiments. Referring to FIG5 , method 100 proceeds to step 104. According to step 104, a simulation diagram of the target tissue is designed to obtain the cell number of the target tissue 500, and is shown in FIG5 . In FIG5 , the target tissue 500 is designed as a cube having a thickness d _t and a length d _cell . In order to make the multi-layer tissue circuit model 400 approach the target tissue 500, the equivalent capacitance of the multi-layer tissue circuit model 400 needs to be approached to the capacitance of the target tissue 500. Therefore, the capacitance of the target tissue needs to be calculated. The capacitance of the target tissue can be obtained by substituting the target tissue cell parameters into formula (f) and formula (g).

其中：d _cell =d _c +d _m The descriptions of formula (f) and formula (g) are as follows:

Where: d _cell = d _c + d _m

S _cell = d _cell × d _cell

2 S _cell = S _cell + S _cell In the above formula, S _cell is the surface area of the target tissue, R _t is the resistance value of the target tissue resistor, and C _t is the capacitance value of the target tissue capacitor. Since it is a double cell series connection, S _cell is 2S _cell . And from formula (f), it can be seen that since C _t is affected by the length and thickness of the target tissue, in order to facilitate discussion, different target tissues are designed to have the same size, where the length d _cell is 28μm and the thickness d _t is 1mm. The results are recorded in Tables 7 and 8.

In some embodiments of the present disclosure, Tables 7 and 8 provide analog resistance and analog capacitance corresponding to different tissues of the human body, such as skin, muscle, fat, bone, etc., at the 930MHz, 2.4GHz, and 5.8GHz frequency bands of the ISM Band, and are obtained according to formulas (f) and (g). However, it should be noted that this should not limit the scope of the present embodiment.

Please refer to Table 7, which is a table of simulated cell capacitance of each target tissue. At the same frequency, the capacitance is in the order of muscle, skin, bone, and fat. From formula (g), we know that capacitance is proportional to dielectric constant. The higher the dielectric constant, the higher the capacitance. Please refer to Table 8, which is a table of simulated cell resistance of each target tissue. At the same frequency, the resistance is in the order of fat, bone, skin, and muscle. From formula (g), we know that resistance is inversely proportional to conductivity. The higher the conductivity, the lower the resistance.

FIG6A to FIG6D are cell arrangement diagrams of target tissues according to some embodiments of the present disclosure. According to some embodiments of the present disclosure, FIG6A is a skin tissue arrangement diagram 600, FIG6B is a fat tissue arrangement diagram 610, FIG6C is a muscle tissue arrangement diagram 620, including myometrial cells 6201, actin cells 6202, myosin cells 6203, and FIG6D is a bone tissue arrangement diagram 630, including trabecular cells 6301 and cortical bone cells 6302. The red arrows in FIG6A to FIG6D are the directions of current flow, please refer to FIG6A to FIG6D. According to step 104, in order to make the multi-layer tissue circuit model 400 closer to the target tissue, the multi-layer tissue circuit model 400 is arranged according to the cell arrangement of each target tissue in Figures 6A to 6D by ADS, wherein the number of cells simulated in ADS is twice the number of cells in the actual tissue, because the serial connection method in ADS is parallel plate arrangement of cells, and the results are recorded in Table 9.

In some embodiments of the present disclosure, Table 9 provides the number of target tissues, such as skin, muscle, fat, bone, etc., connected in series on the ADS at the 930MHz, 2.4GHz, and 5.8GHz frequency bands of the ISM Band, where N is the number of ADS simulated cells connected in series. However, it should be noted that this should not limit the scope of the present embodiment.

Please refer to Table 9, which is a table of the ADS simulated cell series number of each target tissue. At the same frequency, the series number is fat, bone, skin, and muscle in order. From Table 7 and Table 9, it can be seen that the series number is inversely proportional to the capacitance of the target tissue, and due to the characteristics of capacitor series connection, it can be seen that fat can be connected in series with the most cells.

Please refer to step 105 in FIG. 1 . The complex circuit model can be made close to the target tissue by using Table 9. Then, by using formula (e) and formula (h), the equivalent resistance and electromagnetic wave absorption power of each human body tissue simulated by the multi-layer tissue circuit model 400 can be obtained through ADS. The results are recorded in Table 10.

在上式中，P為複數電路模型的電磁波吸收功率、V為複數電路模型的節點電壓、R為複數電路模型的電阻。 The description of formula (h) is as follows:

In the above formula, P is the electromagnetic wave absorption power of the complex circuit model, V is the node voltage of the complex circuit model, and R is the resistance of the complex circuit model.

In some embodiments of the present disclosure, Table 10 provides the resistance and electromagnetic wave absorption power of various human tissues, such as skin, muscle, fat, bone, etc., simulated by the multi-layer tissue circuit model 400 at the 930MHz, 2.4GHz, and 5.8GHz frequency bands of the ISM Band. However, it should be noted that this should not limit the scope of the present embodiment.

FIG. 7A and FIG. 7B are diagrams showing the change of resistance and electromagnetic wave absorption power of each human body tissue with respect to frequency according to some embodiments of the present disclosure, and Table 10 is a table showing the resistance and electromagnetic wave absorption power of each human body tissue in FIG. 7A and FIG. 7B, step 105 in FIG. 1 and Table 10. It can be seen from FIG. 7A and FIG. 7B, Table 10 and formula (h) that the equivalent resistance of the simulated tissue is inversely proportional to the absorption power. At the same frequency, the equivalent resistance of the simulated tissue is bone, fat, skin, and muscle in order, and the absorption power is muscle, skin, fat, and bone in order. Here, the water content of the simulated tissue can be analyzed. The more water content of the tissue, the smaller the resistance. Therefore, muscles have the highest water content, while bones have the lowest water content.

Please refer to Figures 8 and 9. The method 100 comes to step 106 to establish a body part model, including multiple multi-layer tissue circuit models 400, wherein the multiple multi-layer tissue circuit models 400 are connected in series with each other. Figures 8 and 9 show the hand simulation model 700 and the head simulation model 800 designed according to the implementation method in Figure 5 and step 106.

In FIG8 , the hand simulation model 700 includes a hand size model 701 and a hand structure model 702. The hand size model 701 is a cube with a length d _t1 and a width d _hand , and the hand structure model 702 is a cube composed of hand skin tissue 7021, hand fat tissue 7022, hand muscle tissue 7023, and hand bone tissue 7024 connected in series by the multi-layer tissue circuit model 400. The length d _t1 and width d _hand of the hand size model 701 are set to be consistent with the laboratory setting, wherein the length d _t1 is 28 μm and the width d _hand is 37 mm. The hand skin tissue 7021 of the hand structure model 702 is set to 1mm, the hand fat tissue 7022 is set to 2mm, the hand muscle tissue 7023 is set to 20mm, and the hand bone tissue 7024 is set to 15mm. Then, the real part of the impedance of the hand simulation model 700 is obtained from ADS, and then the resistance value of the simple hand is obtained. The results are recorded in Table 11.

FIG9 is another embodiment of the present disclosure. In FIG9 , a head simulation model 800 includes a head size model 801 and a head structure model 802. The head size model 801 is a cube having a length d _t1 and a width d _head , and the head structure model 802 is a cube composed of a head skin tissue 8021, a head fat tissue 8022, and a head bone tissue 8023 connected in series by a multi-layer tissue circuit model 400. The length d _t1 and the width d _head of the head size model 801 are set to be consistent with the laboratory setting, wherein the length d _t1 is 28 μm, and the width d _head is 22.8 mm. The head skin tissue 8021 of the head structure model 802 is set to 0.7mm, the head fat tissue 8022 is set to 1.6mm, and the head bone tissue 8023 is set to 20.5mm. Then, the real part of the impedance of the head simulation model 800 is obtained from ADS, and then the resistance value of the simplified head is obtained. The results are recorded in Table 11.

In some embodiments of the present disclosure, Table 11 provides the resistance of the hand simulation model 700 and the head simulation model 800 at the 930MHz, 2.4GHz, and 5.8GHz frequency bands of the ISM Band.

Please refer to Table 11 to go to step 107, and determine the tissue resistance related to the electromagnetic wave absorption rate according to the circuit model. Table 11 is a resistance comparison table of the hand simulation model 700 and the head simulation model 800. It can be seen from Table 11 that at the same frequency, the resistance of the hand simulation model 700 is greater than that of the head simulation model 800. The resistance is different due to the different tissue composition. The head simulation model 800 lacks muscle tissue and has a smaller thickness. It can be seen that the size and thickness of human tissue are proportional to the human resistance. The thicker the human tissue, the greater the resistance. And from formula (h), it can be seen that the resistance is inversely proportional to the electromagnetic wave absorption power P, so the electromagnetic wave absorption power of the hand simulation model 700 will be less than that of the head simulation model 800.

The simulation model of human tissue, such as the single-layer tissue circuit model 300, the multi-layer tissue circuit model 400, the hand simulation model 700 or the head simulation model 800 can be executed by, for example, an electronic device (such as a computer). Referring to FIG. 10 , the electronic device 900 can be a smart phone, a tablet computer, a personal computer, a laptop computer, a server, a distributed computer, a cloud server, an industrial computer or various electronic devices with computing capabilities, etc., but the present invention is not limited thereto. The electronic device 900 includes a processor 910 and a memory 920, and the processor 910 is communicatively connected to the memory 920, where the communication connection can be achieved through any wired or wireless communication means, or can also be achieved through the Internet. The processor 910 can be a central processing unit, a microprocessor, a microcontroller, a digital signal processor, an image processing chip, a special application integrated circuit, etc. The memory 920 can be a random access memory, a read-only memory, a flash memory, a floppy disk, a hard disk, an optical disk, a flash drive, a tape, or a database accessible via the Internet, which stores multiple instructions. The processor 910 will execute these instructions to complete the method described in Figure 1. The electronic device 900 may also include an appropriate output interface to electrically connect to an appropriate output device, such as an audio and video output interface electrically connected to a display to provide information to notify personnel.

From the above implementation method, it can be seen that one advantage of the present disclosure is to form a multi-layer tissue circuit model 400 by connecting multiple cell fluid equivalent parallel plate circuits 301 to multiple cytoplasm equivalent parallel plate circuits 302. The number of cells connected in series is obtained by ADS, so that the multi-layer tissue circuit model 400 simulates different human tissues, such as the hand simulation model 700 and the head simulation model 800, and by formula (h), it can be seen that the resistance of different human tissues is inversely proportional to the electromagnetic wave absorption rate, and the electromagnetic wave absorption relationship of human tissues is obtained.

The electromagnetic wave absorption relationship of human body tissue disclosed in this disclosure can be used to improve product development and design, for example, by maintaining the power upper limit of wireless communication equipment within the SAR standard. For example, when the simulated resistance/electromagnetic wave absorption rate is greater than a preset value, the computer determines that the design of this product does not meet the regulations, and then sends a message to notify the personnel to adjust the product parameters, such as adjusting the power of the wireless communication equipment or adjusting the antenna position. When the simulated resistance/electromagnetic wave absorption rate is equal to or less than a preset value, the computer determines that the design of this product meets the regulations, and sends a message to notify the personnel to proceed with subsequent product development or mass production.

Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field can easily use the present disclosure as a basis for designing or modifying other processes and structures to achieve the same purpose and/or achieve the same advantages of the embodiments introduced in the present disclosure. Anyone with ordinary knowledge in this technical field should also understand that various changes, substitutions, and modifications can be made to the present disclosure without violating the spirit and scope of the present disclosure.

301: Cell fluid equivalent parallel plate circuit

3011: Parallel plate resistance of cell fluid

3012: Parallel plate capacitance of cell fluid

302: Cytoplasmic equivalent parallel plate circuit

3021: Cytoplasmic parallel plate resistance

3022: Cytoplasmic parallel plate capacitance

400:Multi-layer organizational circuit model

Claims (8)

A method for simulating the electromagnetic wave absorption rate of a human body tissue is applicable to an electronic device, wherein the method comprises: establishing a circuit model, wherein the model comprises a plurality of cytoplasm equivalent parallel plate circuits and a plurality of cytoplasm equivalent parallel plate circuits, wherein one of the cytoplasm equivalent parallel plate circuits connects a first one of the cytoplasm equivalent parallel plate circuits to a second one of the cytoplasm equivalent parallel plate circuits, wherein each of the cytoplasm equivalent parallel plate circuits comprises a first resistor and a first capacitor connected in parallel, and each of the cytoplasm equivalent parallel plate circuits comprises a first resistor and a first capacitor connected in parallel. a second resistor and a second capacitor, wherein a first end of the first resistor is connected to a first end of the first capacitor, a second end of the first resistor is connected to a second end of the first capacitor, a first end of the second resistor is connected to a first end of the second capacitor, and a second end of the second resistor is connected to a second end of the second capacitor; obtaining at least one cell parameter, at least one cell fluid parameter, and a cell quantity according to a target human tissue; and determining a tissue resistor according to the circuit model, the at least one cell parameter, the at least one cell fluid parameter, and the cell quantity. The method as described in claim 1, wherein the at least one cell parameter includes a cell thickness, a cell conductivity and a cell dielectric constant, and the at least one cell fluid parameter includes a cell fluid dielectric constant and a cell fluid conductivity. The method as described in claim 1 further includes: based on the tissue resistance, sending a message to notify personnel to adjust product parameters. The method as described in claim 1, wherein the first of the cytoplasm equivalent parallel plate circuits is connected in series with a third of the cytoplasm equivalent parallel plate circuits, and the second of the cytoplasm equivalent parallel plate circuits is connected in series with a fourth of the cytoplasm equivalent parallel plate circuits. An electronic device for simulating the electromagnetic wave absorption rate of human tissues includes: a memory for storing a plurality of instructions; a processor for executing the instructions to complete the following steps: establishing a circuit model, the model includes a plurality of cytoplasm equivalent parallel plate circuits and a plurality of cytoplasm equivalent parallel plate circuits, wherein one of the cytoplasm equivalent parallel plate circuits connects a first one of the cytoplasm equivalent parallel plate circuits to a second one of the cytoplasm equivalent parallel plate circuits, wherein each of the cytoplasm equivalent parallel plate circuits includes a first resistor and a first capacitor connected in parallel, and each of the cytoplasm equivalent parallel plate circuits includes a first resistor and a first capacitor connected in parallel. The circuit includes a second resistor and a second capacitor connected in parallel, wherein a first end of the first resistor is connected to a first end of the first capacitor, a second end of the first resistor is connected to a second end of the first capacitor, a first end of the second resistor is connected to a first end of the second capacitor, and a second end of the second resistor is connected to a second end of the second capacitor; at least one cell parameter, at least one cell fluid parameter, and a cell quantity are obtained according to a target human tissue; and a tissue resistance related to the electromagnetic wave absorption rate is determined according to the circuit model, the at least one cell parameter, the at least one cell fluid parameter, and the cell quantity. An electronic device for measuring electromagnetic wave absorption rate of human tissue as described in claim 5, wherein the at least one cell parameter includes a cell thickness, a cell conductivity and a cell dielectric constant, and the at least one cell fluid parameter includes a cell fluid dielectric constant and a cell fluid conductivity. An electronic device for measuring the electromagnetic wave absorption rate of human tissue as described in claim 5, wherein the steps further include: based on the tissue resistance, sending a message to notify personnel to adjust product parameters. An electronic device for measuring electromagnetic wave absorption rate of human tissue as described in claim 5, wherein the first of the cell plasma equivalent parallel plate circuits is used to connect to a third of the cell plasma equivalent parallel plate circuits, and the second of the cell plasma equivalent parallel plate circuits is used to connect to a fourth of the cell plasma equivalent parallel plate circuits.