CN111384598A - Yagi antenna - Google Patents
Yagi antenna Download PDFInfo
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- CN111384598A CN111384598A CN201811610081.1A CN201811610081A CN111384598A CN 111384598 A CN111384598 A CN 111384598A CN 201811610081 A CN201811610081 A CN 201811610081A CN 111384598 A CN111384598 A CN 111384598A
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- 239000000758 substrate Substances 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000013068 supply chain management Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/28—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements
- H01Q19/30—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention relates to the technical field of antennas, and discloses a yagi antenna which comprises a planar dielectric substrate and an antenna body printed on the surface of the planar dielectric substrate, wherein the antenna body comprises a transmitter, at least one first wave guide, at least one second wave guide and a reflector, wherein the transmitter, the first wave guide, the second wave guide and the reflector are parallel to each other and are in a strip shape; wherein, a ladder-shaped gap for dividing the emitter into two parts is formed on the emitter; the first wave guide is positioned at one side of the transmitter and is coupled with the transmitter; the second wave guide is positioned between the first wave guide and the transmitter and is coupled with the transmitter close to the transmitter; the reflector is located on a side of the transmitter facing away from the first waveguide. The yagi antenna can achieve the characteristics of high directivity and high gain in a specific direction and ultra-wide bandwidth, and has the advantages of being small in size, light in weight and the like.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a yagi antenna.
Background
Currently, Radio Frequency Identification (RFID) technology is widely used in the fields of inventory management, supply chain management (scm), factory automation, national defense, medical treatment, construction, transportation, and the like. For example, RFID tags are used in the traditional transportation field to manage vehicle violations, count traffic flows, mass transit and parking control in cities, day-to-day vehicle traffic management, illegal vehicle identification within specified time limits, and the like. In order to identify an RFID tag of a specific vehicle on a road on which a large number of vehicles travel, an RFID reader antenna needs to be miniaturized and also needs to be designed to increase a radiation gain in a specific direction.
The plane YAGI antenna (YAGI antenna) is simple to manufacture and relatively small, and therefore is widely used as an antenna of an RFID card reader. A YAGI antenna generally has a characteristic of concentrating a radiation gain in a specific direction. However, since the higher the antenna gain is, the narrower the bandwidth is, it is an urgent technical problem to be solved by those skilled in the art how to realize a planar YAGI antenna having a high directivity and a high gain in a specific direction and having an ultra wide bandwidth.
Disclosure of Invention
The invention provides a yagi antenna which can achieve the characteristics of high directivity, high gain and ultra-wide bandwidth in a specific direction.
In order to achieve the purpose, the invention provides the following technical scheme:
a yagi antenna comprises a plane type dielectric substrate and an antenna body printed on the surface of the plane type dielectric substrate, wherein the antenna body comprises a transmitter, at least one first wave guide, at least one second wave guide and a reflector which are parallel to each other and are all in a strip shape; wherein,
a step-shaped gap for dividing the emitter into two parts is formed on the emitter;
the first wave guide is positioned at one side of the transmitter and is coupled with the transmitter;
the second waveguide is positioned between the first waveguide and the transmitter and coupled with the transmitter proximate to the transmitter;
the reflector is located on a side of the transmitter facing away from the first waveguide.
The yagi antenna comprises a planar dielectric substrate and an antenna body printed on the surface of the planar dielectric substrate, wherein the antenna body comprises a transmitter, a first waveguide, a second waveguide and a reflector, wherein, a ladder-shaped gap which divides the emitter into two parts is formed on the emitter, and the emitter can be expanded into a plurality of sizes and shapes for use according to the different applied frequencies of the antenna, the frequency domain of the antenna can be expanded to ensure that a plurality of impedances are easier to match, and a second wave guide is arranged near the transmitter to be used as a parasitic component to carry out impedance matching and stably expand the impedance bandwidth, thereby realizing that the yagi antenna has high directivity and high gain in a specific direction and simultaneously has the characteristic of ultra wide bandwidth, and, the yagi antenna is realized on the planar dielectric substrate, and has the advantages of miniaturization, light weight and the like.
In one possible implementation, the reflector length is greater than the transmitter length, the transmitter length is greater than the length of the second waveguide, and the length of the second waveguide is greater than the length of the first waveguide.
In one possible implementation, the stepped gap includes a first gap and a second gap provided along the width direction of the transmitter, and a third gap along the length direction of the transmitter and communicating the first gap and the second gap.
In a possible implementation manner, the first gap is located at a side of the transmitter close to the first waveguide, the second gap is located at a side of the transmitter close to the reflector, and a signal connection terminal and a ground terminal are respectively formed at two sides of the second gap.
In a possible implementation manner, the wireless communication device further includes a radio frequency cable, the radio frequency cable is provided with a signal line for transmitting a radio frequency signal and a ground plane for transmitting a ground voltage, the signal line is electrically connected to the signal connection terminal on the transmitter, and the ground plane is electrically connected to the ground terminal on the transmitter.
In a possible implementation manner, when the number of the first waveguides is multiple, the multiple first waveguides are distributed at the same interval and have the same length.
In one possible implementation manner, the planar dielectric substrate is made of an FR4 glass fiber epoxy resin copper clad plate.
In a possible implementation manner, the antenna further comprises a protective casing for protecting the planar dielectric substrate and the antenna body.
In one possible implementation, the planar dielectric substrate is fixed in the protective housing by a bracket.
In a possible implementation manner, the edge of the planar dielectric substrate is formed with a fixing groove for matching connection with the inside of the protective shell.
Drawings
Fig. 1 is a schematic structural diagram of a yagi antenna according to an embodiment of the present invention;
fig. 2 is a graph showing the relationship between the resonant frequency change and the reflection loss change of the yagi antenna according to the embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the length variation of the step-shaped slot and the variation of the reflection loss according to the embodiment of the present invention;
fig. 4 shows a radiation pattern of a yagi antenna according to an embodiment of the present invention.
Icon:
1-a planar dielectric substrate; 2-a transmitter; 21-step type gap; 3-a first wave guide; 4-a second waveguide; 5-a reflector; 6-fixing the groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a yagi antenna, which includes a planar dielectric substrate 1 and an antenna body printed on the planar dielectric substrate 1, wherein the antenna body includes a transmitter 2, at least one first waveguide 3, a second waveguide 4 and a reflector 5, which are parallel to each other and all of which are in the shape of a strip; wherein,
a step-shaped gap 21 for dividing the emitter 2 into two parts is formed on the emitter 2;
the first wave guide 3 is positioned at one side of the transmitter 2 and is coupled with the transmitter 2;
the second waveguide 4 is located between the first waveguide 3 and the transmitter 2 and coupled with the transmitter 2 adjacent to the transmitter 2;
the reflector 5 is located on the side of the emitter 2 facing away from the first waveguide 3.
The yagi antenna in the above embodiment of the invention includes a planar dielectric substrate 1 and an antenna body printed on the surface of the planar dielectric substrate 1, wherein the antenna body includes a transmitter 2, a first waveguide 3, a second waveguide 4 and a reflector 5, wherein the transmitter 2 is formed with a step-shaped slot 21 dividing the transmitter 2 into two parts, and the slot can be expanded into various sizes and shapes according to the frequency difference applied by the antenna, so as to expand the frequency domain of the antenna and make it easier to match various impedances, and the second waveguide 4 is arranged near the transmitter 2 as a parasitic component to perform impedance matching and stably expand the impedance bandwidth, thereby realizing that the yagi antenna has high directivity and high gain in a specific direction and has the characteristic of having a bandwidth at the same time, and realizing an ultra-wide yagi antenna on the planar dielectric substrate, also has the advantages of miniaturization and light weight.
In addition, the yagi antenna in the embodiment of the invention can be suitable for a wireless system, so that the limitation on space is eliminated, and the cost can be saved.
In the embodiment of the present invention, the planar dielectric substrate 1 may be specifically made of FR4 glass fiber epoxy resin copper clad plate, and the transmitter 2 is specifically a half-wavelength dipole transmitter 2.
FIG. 1 is a schematic structural diagram of a yagi antenna, L, according to an embodiment of the present inventionDRDenotes the length, L, of the emitter 2DDenotes the length, L, of the first wave-guide 3RDenotes the length of the reflector 5, ssl denotes the length of the stepped slot 21, dDDenotes the distance between two adjacent first wave-guides 3, dRRepresenting the distance between the emitter 2 and the reflector 5.
In particular, the length L of the reflector 5RGreater than length L of emitter 2DRLength L of the emitter 2DRIs longer than the length of the second wave-guide 4, the length of the second wave-guide 4 is longer than the length L of the first wave-guide 3D. In practical applications, the length L of the reflector 5RLength L of the emitter 2DRLength L of the first waveguide 3DThe specific parameters of (a) are selected according to the resonant frequency of the antenna and the material of the planar dielectric substrate 1 in the present embodiment, and are not limited herein.
Specifically, the stepped slits 21 may include first and second slits provided in a width direction of the emitter 2, and a third slit along a length direction of the emitter 2 and communicating the first and second slits.
Specifically, a signal connection terminal and a ground terminal are respectively formed at both sides of the stepped slot 21, and preferably, the first slot is located at a side of the transmitter 2 adjacent to the first waveguide 3, the second slot is located at a side of the transmitter 2 adjacent to the reflector 5, and a signal connection terminal and a ground terminal are respectively formed at both sides of the second slot.
In the embodiment of the present invention, in practical applications, the length ssl of the step-shaped slot 21 and the distance from the transmitter 2 to the second waveguide 4 can be optimized through experiments. The position of the stepped slot 21 is optimized by increasing the length of the stepped slot 21 from the center of the emitter 2 to one side. And the ultra wide bandwidth frequency of the antenna can be optimized by optimizing the length ssl of the stepped slot 21, the length of the second waveguide, and the distance from the transmitter 2 to the second waveguide 4.
In the embodiment, the yagi antenna in the RFID card reader uses the UHF frequency domain center frequency, and fig. 2 shows a graph of the relationship between the change in the resonant frequency of the yagi antenna and the change in the reflection loss provided in the embodiment of the present invention; as shown in fig. 2, it is shown that when the length ssl of the stepped slot is 25mm and the width ssl is 1mm, the reflection loss value of the antenna is measured by a network analyzer, and the reflection loss in the UHF band (0.86GHz to 0.96GHz band) is 20dB or less. In an actual simulation experiment, the impedance bandwidth based on-10 dB ensures that the impedance bandwidth is more than 220MHz based on UHF center frequency, and the impedance bandwidth is fully ensured in consideration of actual use environment.
Fig. 3 is a graph showing the relationship between the change in the length of the stepped slot and the change in the reflection loss, and fig. 3 shows the change in the reflection loss of the antenna when the length of the stepped slot changes from 20mm to 33mm and the resonant frequency is the same. As can be seen from the figure, the reflection loss value also changes with the change in the length of the step-shaped slot. The main parameter involved in the impedance matching of the antenna of the present invention is the length ssl of the stepped slot.
Fig. 4 shows a radiation pattern of the yagi antenna, which varies with azimuth in the Y-Z plane when UHF frequency band 920MHZ is in the ultra high frequency domain, according to an embodiment of the present invention. Curve a represents the radiation gain of the antenna in a specific direction, and it can be seen from the figure that the position where the maximum radiation occurs is the position in the arrangement direction of the wave guides (azimuth angle phi is 90 degrees), and the position where the minimum radiation occurs is the position of the reflector (azimuth angle phi is 270 degrees).
In the embodiment of the present invention, specifically, the yagi antenna further includes a radio frequency cable, the radio frequency cable is provided with a signal line for transmitting a radio frequency signal and a ground plane for transmitting a ground voltage, the signal line is electrically connected to the signal connection terminal on the transmitter 2, and the ground plane is electrically connected to the ground terminal on the transmitter 2, so as to implement transmission of an antenna signal.
In the above-described embodiment of the invention, specifically, when the number of the first waveguides 3 is plural, the plural first waveguides 3 are distributed at the same interval and have the same length. In practical applications, the spacing d between the first wave-guides 3DAnd the distance d of the emitter 2 from the reflector 5RThe setting is optimized according to the center frequency of the antenna and is not limited herein. The higher the number of first waveguides in the yagi antenna, the higher the gain, for example, 7 first waveguides are provided in fig. 1. In practical applications, the number of the first wave guides is specifically set according to the use situation, and is not limited herein.
In the above embodiment of the invention, the planar dielectric substrate 1 and the antenna body are further protected by a protective case.
Specifically, the planar dielectric substrate 1 may be fixed in the protective housing by a bracket, thereby avoiding unstable fixation.
Preferably, the edge of the planar dielectric substrate 1 is further formed with a fixing groove 6 for matching connection with the inside of the protective housing, so that the planar dielectric substrate 1 is further fixed in the protective housing.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The yagi antenna is characterized by comprising a planar dielectric substrate and an antenna body printed on the surface of the planar dielectric substrate, wherein the antenna body comprises a transmitter, at least one first wave guide, a second wave guide and a reflector which are parallel to each other and are in a strip shape; wherein,
a step-shaped gap for dividing the emitter into two parts is formed on the emitter;
the first wave guide is positioned at one side of the transmitter and is coupled with the transmitter;
the second waveguide is positioned between the first waveguide and the transmitter and coupled with the transmitter proximate to the transmitter;
the reflector is located on a side of the transmitter facing away from the first waveguide.
2. The yagi antenna of claim 1 wherein said reflector length is greater than said transmitter length, said transmitter length is greater than a length of said second waveguide, said second waveguide length is greater than a length of said first waveguide.
3. The yagi antenna of claim 1, wherein the stepped slot comprises first and second slots disposed along a width direction of the radiator, and a third slot along a length direction of the radiator and communicating the first and second slots.
4. The yagi antenna as claimed in claim 3, wherein the first slot is located at a side of the radiator adjacent to the first waveguide, the second slot is located at a side of the radiator adjacent to the reflector, and a signal connection terminal and a ground terminal are formed at both sides of the second slot, respectively.
5. The yagi antenna of claim 4, further comprising a radio frequency cable, wherein a signal line for transmitting a radio frequency signal and a ground plane for transmitting a ground voltage are disposed on the radio frequency cable, the signal line is electrically connected to the signal connection terminal on the transmitter, and the ground plane is electrically connected to the ground terminal on the transmitter.
6. The yagi antenna as claimed in claim 1, wherein when the number of the first waveguides is plural, the plural first waveguides are equally spaced and have equal lengths.
7. The yagi antenna of claim 1, wherein the planar dielectric substrate is made of FR4 glass fiber epoxy resin copper clad laminate.
8. Yagi antenna according to any of claims 1-7, further comprising a protective housing for protecting the planar dielectric substrate and antenna body.
9. The yagi antenna of claim 8, wherein the planar dielectric substrate is secured within the protective housing by a bracket.
10. The yagi antenna of claim 9, wherein the edge of the planar dielectric substrate is formed with a fixing groove for fitting connection with the inside of the protective housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610081.1A CN111384598A (en) | 2018-12-27 | 2018-12-27 | Yagi antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610081.1A CN111384598A (en) | 2018-12-27 | 2018-12-27 | Yagi antenna |
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| Publication Number | Publication Date |
|---|---|
| CN111384598A true CN111384598A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811610081.1A Pending CN111384598A (en) | 2018-12-27 | 2018-12-27 | Yagi antenna |
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| CN (1) | CN111384598A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116231283A (en) * | 2023-03-14 | 2023-06-06 | 东莞市猎声电子科技有限公司 | A kind of antenna and its application |
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|---|---|---|---|---|
| US6326922B1 (en) * | 2000-06-29 | 2001-12-04 | Worldspace Corporation | Yagi antenna coupled with a low noise amplifier on the same printed circuit board |
| JP2005142925A (en) * | 2003-11-07 | 2005-06-02 | Yagi Antenna Co Ltd | Antenna device |
| CN102044756A (en) * | 2009-10-26 | 2011-05-04 | 雷凌科技股份有限公司 | Dual Band Printed Yagi Antenna |
| CN202196864U (en) * | 2011-08-17 | 2012-04-18 | 广东盛华德通讯科技股份有限公司 | Dual-frequency yagi antenna |
| KR20140102974A (en) * | 2013-02-15 | 2014-08-25 | 동서대학교산학협력단 | A broadband plannar Quasi-Yagi antenna |
| CN204741080U (en) * | 2015-05-27 | 2015-11-04 | 深圳光启智能光子技术有限公司 | Antenna device |
| CN106299641A (en) * | 2016-08-08 | 2017-01-04 | 哈尔滨工业大学 | Wide-band high gain yagi aerial |
| CN108232467A (en) * | 2017-12-20 | 2018-06-29 | 深圳市航天华拓科技有限公司 | Micro-strip Quasi-Yagi antenna |
-
2018
- 2018-12-27 CN CN201811610081.1A patent/CN111384598A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326922B1 (en) * | 2000-06-29 | 2001-12-04 | Worldspace Corporation | Yagi antenna coupled with a low noise amplifier on the same printed circuit board |
| JP2005142925A (en) * | 2003-11-07 | 2005-06-02 | Yagi Antenna Co Ltd | Antenna device |
| CN102044756A (en) * | 2009-10-26 | 2011-05-04 | 雷凌科技股份有限公司 | Dual Band Printed Yagi Antenna |
| CN202196864U (en) * | 2011-08-17 | 2012-04-18 | 广东盛华德通讯科技股份有限公司 | Dual-frequency yagi antenna |
| KR20140102974A (en) * | 2013-02-15 | 2014-08-25 | 동서대학교산학협력단 | A broadband plannar Quasi-Yagi antenna |
| CN204741080U (en) * | 2015-05-27 | 2015-11-04 | 深圳光启智能光子技术有限公司 | Antenna device |
| CN106299641A (en) * | 2016-08-08 | 2017-01-04 | 哈尔滨工业大学 | Wide-band high gain yagi aerial |
| CN108232467A (en) * | 2017-12-20 | 2018-06-29 | 深圳市航天华拓科技有限公司 | Micro-strip Quasi-Yagi antenna |
Non-Patent Citations (1)
| Title |
|---|
| 俱新德: "《实用天线工程技术》", 30 April 2015 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116231283A (en) * | 2023-03-14 | 2023-06-06 | 东莞市猎声电子科技有限公司 | A kind of antenna and its application |
| CN116231283B (en) * | 2023-03-14 | 2024-03-19 | 东莞市猎声电子科技有限公司 | Antenna and application |
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Application publication date: 20200707 |