WO2018050098A1 - Antenna assembly for microwave oven, and microwave oven - Google Patents

Abstract

An antenna assembly (100) for a microwave oven, and the microwave oven. The antenna assembly comprises a grounding plate (1), a first antenna rod (2), second antenna rods (3), a third antenna rod (4), and a drive device (5). The first antenna rod is disposed on the grounding plate, and a shaft hole penetrating the first antenna rod is disposed in the first antenna rod. One end of the second antenna rod penetrates through the grounding plate and is electrically connected to a semiconductor microwave source, and the other end of each second antenna rod is electrically connected to the first antenna rod. The third antenna rod is disposed on the first antenna rod and can rotate around the center axis of the first antenna rod. The drive device drives the third antenna rod to rotate, by means of a pivotal connection shaft (51) located in the shaft hole.

Description

Microwave oven antenna assembly and microwave oven Technical field

The present invention relates to the field of microwave ovens, and more particularly to an antenna assembly and a microwave oven for a microwave oven.

Background technique

With the research on semiconductor microwave heating technology, in order to improve the heating efficiency and heating uniformity of the microwave oven, methods such as adjusting the output power, phase, frequency, and multi-feed of the semiconductor microwave source are generally employed. However, the heating efficiency of the microwave oven of the related art is still low, and the heating uniformity is poor.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, the present invention provides an antenna assembly for a microwave oven having a third antenna rod with an adjustable angle. When the antenna assembly is used in a microwave oven, the heating efficiency of the microwave oven and the uniformity of heating can be improved.

The present invention also proposes a microwave oven comprising the antenna assembly of the microwave oven described above.

An antenna assembly of a microwave oven according to an embodiment of the present invention, the microwave oven having a semiconductor microwave source, the antenna assembly comprising: a ground plate; a first antenna rod, the first antenna rod being disposed on the ground plate and The grounding plate is disposed substantially vertically, the first antenna rod is provided with a shaft hole extending through the first antenna rod in the axial direction; at least one second antenna rod, each of the second antenna rods is disposed at the connection a second end of the at least one of the second antenna rods is electrically connected to the semiconductor microwave source through the ground plate, and the other end of each of the second antenna rods is electrically connected to the first antenna rod; a third antenna rod, the third antenna rod is disposed on the first antenna rod and disposed parallel to the ground plate, and the third antenna rod is rotatable around a central axis of the first antenna rod; The driving device is disposed on the ground plate and the driving device drives the third antenna rod to rotate through a pivot shaft located in the shaft hole.

An antenna assembly according to an embodiment of the present invention, by disposing a third antenna rod on a first antenna rod and making it parallel to the ground plate, while driving the third antenna rod to rotate around a central axis of the first antenna rod by using a driving device When the antenna assembly is used in a microwave oven, by rotating the third antenna rod to adjust the angle of the third antenna rod, it is advantageous to improve the heating efficiency when the microwave oven is heated, and the uniformity of heating when the microwave oven is heated.

According to some embodiments of the present invention, each of the second antenna rods includes a first connecting rod and a second connecting rod, one end of the first connecting rod is disposed on the grounding plate, and the first connecting rod The first connecting rod is electrically connected to the first antenna rod through the second connecting rod, and the first connecting rod is respectively disposed perpendicular to the grounding plate and the second connecting rod.

Specifically, the vertical distance between the second connecting rod and the grounding plate is H1, H1=(λ/8)±X mm, where λ=c/f, c is the speed of light, f is the working frequency, and X is the pre- Set the value.

Specifically, the length of the second connecting rod is L1, L1=(λ/8)±X mm, where λ=c/f, c is the speed of light, f is the operating frequency, and X is the preset value.

In some embodiments of the present invention, the length of the third antenna rod is L2, L2=(λ/4)±X mm, where λ=c/f, c is the speed of light, f is the operating frequency, and X is the pre- Set the value.

In some embodiments of the present invention, a vertical distance between the third antenna rod and the ground plate is H2, H2=(λ/4)±X mm, where λ=c/f, c is the speed of light, and f is Working frequency, X is the preset value.

Alternatively, 2.4 GHz ≤ f ≤ 2.5 GHz.

Alternatively, X = 0 mm or X = 10 mm.

According to some embodiments of the present invention, an insulating member is disposed between the mating faces of the first antenna rod and the ground plate.

According to some embodiments of the invention, the third antenna rod is symmetrically disposed relative to the first antenna rod.

A microwave oven according to an embodiment of the present invention includes a case body having a cooking cavity and a placement cavity spaced apart from each other; at least one semiconductor microwave source, each of the semiconductor microwave sources being disposed in the placement cavity; At least one antenna assembly, the antenna assembly is disposed on a sidewall of the cooking cavity, and the first antenna rod to the third antenna rod are located in the cooking cavity, and the ground plate is located in the a control device, the control device being coupled to the drive device to control the drive device to drive the third antenna rod to rotate.

According to the microwave oven of the embodiment of the present invention, by providing the antenna assembly described above, it is advantageous to improve the uniformity of heating of the microwave oven and the microwave heating efficiency.

According to some embodiments of the present invention, the antenna assembly and the semiconductor microwave source are respectively two, and the two antenna assemblies are respectively disposed on different sidewalls of the cooking cavity, and the two antenna components are respectively It is disposed in one-to-one correspondence with two of the semiconductor microwave sources.

Specifically, the microwave oven further includes a phase shifter for adjusting a phase difference of microwaves of the two semiconductor microwave sources when microwaves generated by the two semiconductor microwave sources pass through the phase shifter.

DRAWINGS

1 is a schematic illustration of an antenna assembly in accordance with some embodiments of the present invention;

2 is a schematic illustration of an antenna assembly for use in a microwave oven in accordance with some embodiments of the present invention.

Reference mark:

Antenna assembly 100;

Grounding plate 1; first antenna rod 2; second antenna rod 3; first connecting rod 31; second connecting rod 32;

a third antenna rod 4; a driving device 5; an insulating member 6;

Cooking chamber 200.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", length", "width", "thickness", "upper", "lower", "front", "back", "left", "right" are understood. Orientation or positional relationship of "upright", "horizontal", "top", "bottom", "inside", "outer", "axial", "circumferential", etc. is based on the orientation shown in the drawings Or, the positional relationship is merely for the convenience of the description of the present invention and the simplification of the description, and is not intended to imply that the device or the component of the present invention has a specific orientation and is constructed and operated in a specific orientation, and thus is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

An antenna assembly 100 of a microwave oven according to an embodiment of the present invention, the antenna assembly 100 can be used in a microwave oven having a semiconductor microwave source, and the antenna assembly 100 is electrically connected to a semiconductor microwave source to facilitate transmission of microwaves from the semiconductor microwave source to the antenna. The assembly 100 is further radiated into the microwave oven via the antenna assembly 100.

As shown in FIG. 1, an antenna assembly 100 according to an embodiment of the present invention may include a grounding plate 1, a first antenna mast 2, at least one second antenna mast 3, a third antenna mast 4, and a driving device 5. It is to be understood herein that "at least one" refers to one or more.

Specifically, as shown in FIG. 1, the first antenna rod 2 is disposed on the ground plate 1 and disposed substantially perpendicular to the ground plate 1. For example, the lower end of the first antenna rod 2 passes through the ground plate 1, and the first antenna rod 2 is disposed substantially perpendicular to the ground plate 1.

Each of the second antenna rods 3 is disposed on the grounding plate 1, and one end of the at least one second antenna rod 3 passes through the grounding plate 1 and a half The conductor microwave sources are electrically connected, and the other end of each of the second antenna rods 3 is electrically connected to the first antenna rod 2. For example, the second antenna rod 3 is two, and the two second antenna rods 3 are all disposed on the grounding plate 1, and one end of each of the second antenna rods 3 is electrically connected to the semiconductor microwave source through the grounding plate 1, for each The other end of the second antenna rod 3 is electrically connected to the first antenna rod 2. Alternatively, in other embodiments, the second antenna rod 3 is three, and the three second antenna rods 3 are all disposed on the grounding plate 1, and one end of one of the second antenna rods 3 passes through the grounding plate 1 and the semiconductor. The microwave source is electrically connected, and the other two ends of the second antenna rod 3 are not connected to the semiconductor microwave source, and the other end of each of the second antenna rods 3 is electrically connected to the first antenna rod 2. Of course, the present invention is not limited thereto. In other embodiments, as shown in FIG. 1, the second antenna rod 3 is one, the second antenna rod 3 is disposed on the grounding plate 1, and one end of the second antenna rod 3 is worn. The grounding plate 1 is connected to the semiconductor microwave source, and the other end of the second antenna rod 3 is electrically connected to the first antenna rod 2.

Preferably, an insulating member 6 is disposed between each of the second antenna rods 3 and the mating surface of the grounding plate 1 to function as an insulation, on the one hand, the reliability of the antenna assembly 100 can be improved, and on the other hand, it is advantageous. The performance of the radiated microwave of the antenna assembly 100 due to the absence of the insulating member 6 is prevented from being affected.

The third antenna rod 4 is disposed on the first antenna rod 2 and disposed in parallel with the ground plate 1, that is, the third antenna rod 4 is disposed perpendicular to the first antenna rod 2. The third antenna rod 4 is rotatable about a central axis of the first antenna rod 2, thereby improving the angle of the third antenna rod 4 by rotating the third antenna rod 4 when the antenna assembly 100 is used in a microwave oven, which is advantageous for improving The heating efficiency when the microwave oven is heated, and the uniformity of heating when the microwave oven is heated.

A shaft hole penetrating the first antenna rod 2 in the axial direction is provided in the first antenna rod 2. It can be understood here that the axial direction is the direction of the axis of the first antenna rod 2.

The driving device 5 is provided on the grounding plate 1 and the driving device 5 drives the third antenna rod 4 to rotate by a pivot shaft 51 located in the shaft hole. For example, the driving device 5 is disposed on a side of the grounding plate 1 remote from the first antenna rod 2, and the pivoting shaft 51 of the driving device 5 extends through the grounding plate 1 into the shaft hole of the first antenna rod 2 to be connected to the third antenna. The rods 4 are connected to drive the rotation of the third antenna rod 4, whereby the structure is simple and reliable.

Specifically, the third antenna rod 4 and the first antenna rod 2 are connected by a snap. For example, when the pivot shaft 51 is fixedly coupled to the third antenna rod 4, the third antenna rod 4 is provided with a convex portion, and the first antenna rod 2 is provided with an annular groove surrounding the shaft hole, when the pivot shaft 51 rotates and When the third antenna rod 4 is driven to rotate, the convex portion can cooperate with the annular groove and the convex portion can rotate relative to the annular groove to realize electrical connection between the first antenna rod 2 and the third antenna rod 4 without The rotation of the third antenna rod 4 relative to the first antenna rod 2 is affected.

Specifically, in order to prevent the performance of the radiated microwave of the antenna assembly 100 from being affected, the pivot shaft 51 is coated with an insulating layer for the surface of the insulator or the pivot shaft 51.

An antenna assembly 100 according to an embodiment of the present invention, by arranging a third antenna rod 4 on the first antenna rod 2 and making it The grounding plates 1 are arranged in parallel while the third antenna rod 4 is driven by the driving device 5 to be rotatable about the central axis of the first antenna rod 2. When the antenna assembly 100 is used in a microwave oven, the third antenna rod 4 is rotated to adjust the third The angle of the antenna rod 4 is advantageous for improving the heating efficiency when the microwave oven is heated and the uniformity of heating when the microwave oven is heated.

According to some embodiments of the present invention, as shown in FIG. 1, each of the second antenna rods 3 includes a first connecting rod 31 and a second connecting rod 32. One end of the first connecting rod 31 is disposed on the grounding plate 1, and the first A connecting rod 31 is electrically connected to the first antenna rod 2 via a second connecting rod 32, and the first connecting rod 31 is disposed perpendicular to the grounding plate 1 and the second connecting rod 32, respectively. That is, one end of the first connecting rod 31 is fixed on the grounding plate 1 and the first connecting rod 31 is disposed perpendicular to the grounding plate 1, and one end of the second connecting rod 32 is connected to the other end of the first connecting rod 31 and second. The connecting rod 32 is disposed perpendicular to the first connecting rod 31, and the other end of the second connecting rod 32 is electrically connected to the first antenna rod 2. Therefore, when one end of the at least one second antenna rod 3 is electrically connected to the semiconductor microwave source through the grounding plate 1, the first connecting rod 31 of the second antenna rod 3 passes through the grounding plate 1 and the semiconductor microwave source. Connected, so the structure is simple and reliable.

Preferably, an insulating member 6 is disposed between each of the first connecting rods 31 and the grounding plate 1 to function as an insulation, thereby improving the reliability of the use of the antenna assembly 100, and on the other hand, avoiding insulation. The performance of the radiating microwave of the antenna assembly 100 caused by the component 6 is affected.

Optionally, the second connecting rod 32 and the first connecting rod 31 and the second connecting rod 32 and the first antenna rod 2 are connected by welding. Of course, the present invention is not limited thereto. In other embodiments, the first antenna rod 2 may also be a rod, and the first antenna rod 2 is formed in a substantially "L" shape.

Specifically, as shown in FIG. 1, the vertical distance between the second connecting rod 32 and the grounding plate 1 is H1, H1=(λ/8)±X mm, where λ=c/f, c is the speed of light, and f is the microwave oven. Working frequency, X is the preset value. The speed of light referred to here means the speed at which light travels in the air, that is, c = 300,000 km/s. For example, when 2.4 GHz ≤ f ≤ 2.5 GHz, X = 0 mm or X = 10 mm, alternatively, H1 is 15 mm, 15.5 mm, or 25 mm.

Specifically, the length of the second connecting rod 32 is L1, L1=(λ/8)±X mm, where λ=c/f, c is the speed of light, f is the operating frequency of the microwave oven, and X is a preset value. The speed of light referred to here refers to the speed of light propagation in the air, c = 300,000 km / s. For example, when 2.4 GHz ≤ f ≤ 2.5 GHz, X = 0 mm or X = 10 mm, alternatively, L1 is 15 mm, 15.5 mm, or 25 mm.

In some embodiments of the present invention, the length of the third antenna rod 4 is L2, L2 = (λ / 4) ± X mm, where λ = c / f, c is the speed of light, f is the operating frequency of the microwave oven, and X is default value. The speed of light referred to here refers to the speed of light propagation in the air, c = 300,000 km / s. For example, when 2.4 GHz ≤ f ≤ 2.5 GHz, X = 0 mm or X = 10 mm, alternatively, L2 is 30 mm, 31 mm, or 40 mm.

According to some embodiments of the invention, the vertical distance between the third antenna rod 4 and the ground plate 1 is H2, H2 = (λ / 4) ± X Mm, where λ=c/f, c is the speed of light, f is the operating frequency of the microwave oven, and X is the preset value. The speed of light referred to here refers to the speed of light propagation in the air, c = 300,000 km / s. For example, when 2.4 GHz ≤ f ≤ 2.5 GHz, X = 0 mm or X = 10 mm, alternatively, H2 is 30 mm, 31 mm, or 40 mm.

In some embodiments of the invention, an insulating member 6 is disposed between the mating faces of the first antenna rod 2 and the ground plate 1. Thereby, the function of the insulation is to improve the reliability of the use of the antenna assembly 100, and on the other hand, to avoid the influence of the radiated microwave performance of the antenna assembly 100 caused by the absence of the insulating member 6.

Optionally, the third antenna rod 4 is arranged symmetrically with respect to the first antenna rod 2. That is, the third antenna rod 4 is symmetrically disposed with respect to the central axis of the first antenna rod 2. Thereby, the center of the third antenna rod 4 is located on the axis of the first antenna rod 2, and when the pivot shaft 51 drives the third antenna rod 4 to rotate, the third antenna rod 4 rotates with its center as the center. Of course, the present invention is not limited thereto. In other embodiments, the pivot shaft 51 is coupled to one end of the third antenna rod 4, and when the pivot shaft 51 is rotated, the third antenna rod 4 is rotated with its one end centered. It can be understood here that the first antenna rod 2 is arranged coaxially with the pivot shaft 51.

As shown in FIG. 2, a microwave oven according to an embodiment of the present invention includes a cabinet, at least one semiconductor microwave source, at least one of the above-described antenna assemblies 100, and a control device.

Specifically, the housing is provided with a cooking chamber 200 and a placement chamber that are spaced apart from one another, for example, the sidewalls of the cooking chamber 200 space the housing out of the cooking chamber 200 and the placement chamber.

Each antenna assembly 100 is disposed on a sidewall of the cooking chamber 200, and the first to third antenna rods 2 to 4 are located within the cooking chamber 200, and the grounding plate 1 is located outside the cooking chamber 200. That is, the first antenna rod 2, the second antenna rod 3, and the third antenna rod 4 are located within the cooking chamber 200, and the ground plate 1 is located on the outer side wall of the cooking chamber 200. Thereby a common ground is achieved between the ground plate 1 and the side wall of the cooking cavity 200. Preferably, the microwave oven is provided with a cover through which the microwaves pass to cover the first antenna rod 2 to the third antenna rod 4.

Each of the semiconductor microwave sources is disposed within the placement cavity to facilitate insertion of one end of the at least one second antenna rod 3 of each of the antenna assemblies 100 through the ground plane 1 to extend into the placement chamber to interface with the semiconductor microwave source within the chamber Electrical connection. For example, the semiconductor microwave source is one, the antenna assembly 100 is two, and the two antenna assemblies 100 correspond to one semiconductor microwave source. One end of at least one second antenna rod 3 of each antenna assembly 100 passes through the ground plate 1 and the semiconductor microwave source. Electrical connection. Or in other embodiments, both the antenna assembly 100 and the semiconductor microwave source are multiple, and the plurality of semiconductor microwave sources are in one-to-one correspondence with the plurality of antenna assemblies 100, and one end of at least one second antenna rod 2 of each antenna assembly 100 It is electrically connected to the corresponding semiconductor microwave source through the ground plate 1.

The control device is connected to the driving device 5 to control the driving device 5 to drive the third antenna rod 4 to rotate. For example, the user can adjust the control device to cause the control device to control the driving device 5 to drive the third antenna rod 4 to rotate according to the adjustment result of the user.

According to the microwave oven of the embodiment of the present invention, by providing the antenna assembly 100 described above, it is advantageous to improve the heating efficiency and the uniformity of heating of the microwave oven.

In some embodiments of the present invention, as shown in FIG. 2, the antenna assembly 100 and the semiconductor microwave source are respectively two, and the two antenna assemblies 100 are respectively disposed on different sidewalls of the cooking cavity 200, and two antenna components. 100 is arranged in one-to-one correspondence with two semiconductor microwave sources. Thereby, the driving devices 5 of the two antenna assemblies 100 are respectively driven to rotate the respective third antenna rods 4 to adjust the angle of the third antenna rod 4, thereby improving the heating efficiency of the microwave oven and the uniformity of heating of the microwave oven.

Specifically, the microwave oven further includes a phase shifter for adjusting a phase difference of microwaves of the two semiconductor microwave sources when the microwaves generated by the two semiconductor microwave sources pass through the phase shifter. Therefore, on the basis of adjusting the rotation angle of the third antenna rod 4, the phase difference of the microwaves of the two semiconductor microwave sources is further adjusted by the phase shifter, thereby further improving the heating efficiency of the microwave oven and the uniformity of heating of the microwave oven. . The structure and operation of the phase shifter are well known to those skilled in the art and will not be described in detail herein.

In the actual research, the inventors respectively provide an antenna assembly 100 on the bottom wall and the left side wall of the cooking chamber 200 of the microwave oven, and the antenna assembly 100 includes a grounding plate 1, a first antenna rod 2, a second antenna rod 3, and a Three antenna rods 4 and a drive unit 5. As shown in FIG. 1 , the first antenna rod 2 is disposed on the grounding plate 1 and disposed substantially perpendicular to the grounding plate 1 , and the first antenna rod 2 is provided with a shaft hole extending through the first antenna rod 2 in the axial direction. One end of the first connecting rod 31 of the second antenna rod 3 is electrically connected to the semiconductor microwave source through the grounding plate 1 , and the other end of the first connecting rod 31 is electrically connected to the first antenna rod 2 through the second connecting rod 32 , first The connecting rod 31 is disposed perpendicular to the grounding plate 1 and the second connecting rod 32. The third antenna rod 4 is disposed on the first antenna rod 2 and disposed in parallel with the grounding plate 1, and the third antenna rod 4 is oriented on the axis of the first antenna rod 2. Symmetrically disposed for the centerline and the third antenna rod 4 is rotatable about the central axis of the first antenna rod 2, the driving device 5 is disposed on the grounding plate 1 and the driving device 5 drives the third antenna rod through the pivoting shaft 51 located in the shaft hole 4 turns.

Each antenna assembly 100 has L1 = 15 mm, L2 = 30 mm, H1 = 15 mm, and H2 = 30 mm. The two grounding plates are heated, and the grounding plate 1 of each antenna assembly 100 is located on the outer side wall of the cooking cavity 200 to achieve common ground. The first antenna rod 2 to the third antenna rod 4 of each antenna assembly 100 extend into the cooking cavity 200. Inside, generally, the antenna assembly 100 needs to increase the cover that can penetrate the microwave to ensure that the first antenna rod 2 to the third antenna rod 4 are not exposed in the cooking cavity 200.

1L of water is placed in the cooking chamber 200. When the operating frequency of the microwave oven is 2.45 GHz, the phase difference between the two semiconductor microwave sources adjusted by the phase shifter varies between 10° and 180°, and the standing wave value of the cooking chamber 200 is as follows The table shows.

Phase difference (°) 10 20 30 40 50 60 70 80 90 Standing wave 2 1.4 1.2 2.6 2.1 3.2 1.3 1.5 1.4 Phase difference (°) 100 110 120 130 140 150 160 170 180 Standing wave 1.5 1.6 2.1 2.2 1.5 1.5 1.7 3.5 4

The smaller the standing wave value, the better. The ideal value is 1. When the standing wave value is equal to 2, the microwave transmission efficiency is 88.9%. When 1L water is put in, it is usually necessary to optimize the standing wave value below 2.

There are still many phase difference cases in the above table that do not meet the design requirements. The standing wave values are optimized by adjusting the angles of the two third antenna rods 4, as follows:

The phase difference is 10°: the left antenna rotates 10° clockwise, and the bottom antenna rotates 0° clockwise to obtain a standing wave: 1.7;

The phase difference is 40°: the left antenna rotates 10° clockwise, and the bottom antenna rotates 20° clockwise to obtain a standing wave: 1.5;

The phase difference is 50°: the left antenna rotates 20° clockwise, and the bottom antenna rotates 40° clockwise to obtain a standing wave: 1.3;

The phase difference is 60°: the left antenna rotates 30° clockwise, and the bottom antenna rotates 45° clockwise to obtain a standing wave: 1.4;

The phase difference is 120°: the left antenna rotates 60° clockwise, and the bottom antenna rotates 60° clockwise to obtain a standing wave: 1.8;

The phase difference is 130°: the left antenna rotates 40° clockwise, and the bottom antenna rotates 30° clockwise to obtain a standing wave: 1.7;

The phase difference is 170°: the left antenna rotates 60° clockwise, and the bottom antenna rotates 90° clockwise to obtain a standing wave: 1.6;

The phase difference is 180°: the left antenna rotates 90° clockwise, and the bottom antenna rotates 75° clockwise to obtain a standing wave: 1.8.

Therefore, when the microwave oven is heated, the phase difference of the microwave radiated by the semiconductor microwave source is usually changed by the phase shifter, and the angles of the two third antenna rods 4 are rotated on the basis of the phase shifter to ensure the standing wave at different phases. The values are all less than 2, thereby improving the heating efficiency of the microwave oven and the uniformity of heating.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (13)

An antenna assembly for a microwave oven, characterized in that the microwave oven has a semiconductor microwave source, and the antenna assembly comprises: Grounding plate a first antenna rod, the first antenna rod is disposed on the ground plate and disposed substantially perpendicular to the ground plate, and the first antenna rod is provided with an axis extending through the first antenna rod in an axial direction hole; At least one second antenna rod, each of the second antenna rods is disposed on the ground plate, and one end of at least one of the second antenna rods is electrically connected to the semiconductor microwave source through the ground plate, each The other end of the second antenna rod is electrically connected to the first antenna rod; a third antenna rod, the third antenna rod is disposed on the first antenna rod and disposed parallel to the ground plate, and the third antenna rod is rotatable about a central axis of the first antenna rod; a driving device, the driving device is disposed on the ground plate and the driving device drives the third antenna rod to rotate through a pivot shaft located in the shaft hole. The antenna assembly of the microwave oven according to claim 1, wherein each of said second antenna rods comprises a first connecting rod and a second connecting rod, one end of said first connecting rod being disposed on said grounding plate And the first connecting rod is electrically connected to the first antenna rod through the second connecting rod, and the first connecting rod is respectively disposed perpendicular to the grounding plate and the second connecting rod. The antenna assembly of the microwave oven according to claim 2, wherein a vertical distance between the second connecting rod and the grounding plate is H1, H1 = (λ / 8) ± X mm, wherein λ = c / f , c is the speed of light, f is the working frequency, and X is the preset value. The antenna assembly of the microwave oven according to claim 2, wherein the length of the second connecting rod is L1, L1 = (λ / 8) ± X mm, wherein λ = c / f, c is the speed of light, f For the working frequency, X is the preset value. The antenna assembly of the microwave oven according to any one of claims 1 to 4, wherein the length of the third antenna rod is L2, L2 = (λ / 4) ± X mm, where λ = c / f , c is the speed of light, f is the working frequency, and X is the preset value. The antenna assembly of the microwave oven according to any one of claims 1 to 5, wherein a vertical distance between the third antenna rod and the ground plate is H2, H2 = (λ / 4) ± X mm, Where λ=c/f, c is the speed of light, f is the operating frequency, and X is the preset value. An antenna assembly for a microwave oven according to any one of claims 3-6, wherein 2.4 GHz ≤ f ≤ 2.5 GHz. An antenna assembly for a microwave oven according to any one of claims 3-6, wherein X = 0 mm or X = 10 Mm. The antenna assembly of the microwave oven according to any one of claims 1 to 8, wherein an insulating member is provided between the mating faces of the first antenna rod and the ground plate. The antenna assembly of the microwave oven according to any one of claims 1 to 9, wherein the third antenna rod is symmetrically disposed with respect to the first antenna rod. A microwave oven characterized in that it comprises a casing having a cooking cavity and a placement cavity spaced apart from each other; At least one semiconductor microwave source, each of said semiconductor microwave sources being disposed within said placement cavity; At least one antenna assembly according to any one of claims 1 to 10, the antenna assembly being disposed on a sidewall of the cooking cavity, and the first to third antenna masts are located The grounding plate is located outside the cooking cavity in the cooking cavity; And a control device coupled to the drive device to control the drive device to drive the third antenna rod to rotate. The microwave oven according to claim 11, wherein the antenna assembly and the semiconductor microwave source are respectively two, and the two antenna assemblies are respectively disposed on different sidewalls of the cooking cavity, two The antenna assembly is disposed in one-to-one correspondence with two of the semiconductor microwave sources. A microwave oven according to claim 12, further comprising a phase shifter for adjusting two of said semiconductors when said microwaves generated by said two semiconductor microwave sources pass said phase shifter The phase difference of the microwave of the microwave source.

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