WO2018050104A1 - 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 (100) comprises a grounding plate (1), a first antenna rod (2), a second antenna rod (3), and auxiliary antenna assemblies (4). The first antenna rod (2) is disposed on the grounding plate (1). The second antenna rod (3) is disposed on the first antenna rod (2) and is disposed parallel to the grounding plate (1). Each auxiliary antenna assembly (4) comprises an auxiliary antenna rod (41) and a lifting device (42). The lifting device (42) is located on one side of the grounding plate (1) distant from the second antenna rod (3). One end of the auxiliary antenna rod (41) penetrates through the grounding plate (1) and is connected to the lifting device (42). The lifting device (42) is suitable for driving the corresponding auxiliary antenna rod (41) to axially move.

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 proposes an antenna assembly for a microwave oven having an auxiliary antenna rod that is expandable in the axial direction, and 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, one end of the first antenna rod is electrically connected to the semiconductor microwave source through the grounding plate; the second antenna rod is disposed on the first antenna rod and Arranging in parallel with the grounding plate; at least one auxiliary antenna assembly, each of the auxiliary antenna assemblies being disposed on the grounding plate, each of the auxiliary antenna assemblies including an auxiliary antenna rod and a lifting device, the lifting device being located at One side of the grounding plate remote from the second antenna rod, one end of the auxiliary antenna rod is connected to the lifting device through the grounding plate, and the lifting device is adapted to drive the corresponding auxiliary antenna rod shaft Moving to adjust the distance between the free end of the auxiliary antenna rod and the ground plate.

An antenna assembly 100 of a microwave oven according to an embodiment of the present invention, by providing at least one auxiliary antenna assembly and each auxiliary antenna assembly on a ground plate, each auxiliary antenna assembly including an auxiliary antenna rod and a lifting device, using a lifting device Driving the corresponding auxiliary antenna rod axially to adjust the distance between the free end of the corresponding auxiliary antenna rod and the grounding plate, thereby facilitating adjustment of the performance of the antenna assembly, and improving the heating efficiency of the microwave oven when the antenna assembly is used in a microwave oven And uniformity of heating.

According to some embodiments of the present invention, the distance between the free end of each of the auxiliary antenna rods and the ground plate is H1, and the maximum value of H1 is (λ/8) ± X mm, where λ = c / f, c For the speed of light, f is the operating frequency and X is the preset value.

According to some embodiments of the invention, the horizontal distance between each of the auxiliary antenna masts and the first antenna mast is H2, H2 = (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.

According to some embodiments of the present invention, the vertical distance between the second antenna rod and the ground plate is H3, H3=(λ/4)±X mm, where λ=c/f, c is the speed of light, and f is working. Frequency, X is the preset value.

According to some embodiments of the present invention, the length of the second antenna rod is L, L = (λ / 4) ± X mm, wherein λ = c / f, c is the speed of light, f is the operating 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 second antenna rod is symmetrically disposed relative to the first antenna rod.

According to some embodiments of the invention, the auxiliary antenna assemblies are two.

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 as described above, the antenna assembly is disposed on a sidewall of the cooking cavity, and the first antenna rod to the second antenna rod are located in the cooking cavity, and the ground plate is located in the cooking cavity And a control device coupled to the lifting device to control the lifting device to drive the auxiliary antenna rod to move axially.

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

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; auxiliary antenna assembly 4; auxiliary antenna rod 41; lifting device 42; lifting shaft 421; fixing base 422;

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", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the indications "radial", "circumferential", etc. is based on the orientation shown in the drawing 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 through the antenna assembly 100 into a cooking cavity of the microwave oven.

As shown in FIG. 1, an antenna assembly 100 according to an embodiment of the present invention may include a ground plate 1, a first antenna rod 2, a second antenna rod 3, and at least one auxiliary antenna assembly 4. 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 grounding plate 1 and disposed substantially perpendicular to the grounding plate 1, and one end of the first antenna rod 2 is electrically connected to the semiconductor microwave source through the grounding plate 1. For example, the lower end of the first antenna rod 2 passes through the ground plate 1 to extend from one side of the ground plate 1 to the other side of the ground plate 1 to be electrically connected to the semiconductor microwave source, and the first antenna rod 2 and the ground plate 1 Generally vertical setting. The microwave generated by the semiconductor microwave source can thus be transmitted to the first antenna mast 2.

The second antenna rod 3 is disposed on the first antenna rod 2 and disposed in parallel with the ground plate 1, whereby the second antenna rod 3 is disposed on the first antenna rod 2 and disposed perpendicular to the first antenna rod 2. For example, the second antenna rod 3 is symmetrically disposed with respect to the first antenna rod 2, that is, the second antenna rod 3 is symmetrically disposed with respect to the central axis of the first antenna rod 2, whereby the center of the second antenna rod 3 is located at the first On the axis of the antenna mast 2. Thereby an electrical connection between the first antenna mast 2 and the second antenna mast 3 is facilitated in order to facilitate the transmission of microwaves from the first antenna mast 2 to the second antenna mast 3. Optionally, the second antenna rod 3 and the first antenna rod 2 are fixedly connected by welding.

Preferably, an insulating member 5 is disposed between the mating faces of the first antenna rod 2 and the grounding plate 1 to function as an insulation, on the one hand, the reliability of the use of the antenna assembly 100 can be improved, and on the other hand, it is advantageous to avoid The performance of the radiated microwave of the antenna assembly 100 caused by the absence of the insulating member 5 is affected.

As shown in FIG. 1, each of the auxiliary antenna assemblies 4 is provided on the ground plate 1. For example, the auxiliary antenna assembly 4 is plural, and the plurality of auxiliary antenna assemblies 4 are all disposed on the grounding plate 1 and evenly distributed on both sides of the first antenna rod 2. Or, in others In the embodiment, the auxiliary antenna assembly 4 is one.

Each of the auxiliary antenna assemblies 4 includes an auxiliary antenna rod 41 and a lifting device 42. The lifting device 42 is located on a side of the grounding plate 1 remote from the second antenna rod 3, and one end of the auxiliary antenna rod 41 is connected to the lifting device 42 through the grounding plate 1. . For example, the lifting device 42 is located on the lower side of the grounding plate 1, and the lower end of the auxiliary antenna rod 41 is connected from the upper side of the grounding plate 1 through the grounding plate 1 to the lower side of the grounding plate 1 to be connected to the lifting device 42.

The lifting device 42 is adapted to drive the corresponding auxiliary antenna rod 41 to move axially to adjust the distance between the free end of the auxiliary antenna rod 41 and the grounding plate 1. For example, the lifting device 42 includes a fixing base 422 and a lifting shaft 421. The lifting shaft 421 is movable relative to the fixing base 422 in the axial direction of the lifting shaft 421, and the auxiliary antenna rod 41 can be sleeved on the lifting shaft 421 when the lifting shaft 421 When moving in the axial direction, the auxiliary antenna rod 41 moves axially with the axial movement of the corresponding lifting shaft 421. Specifically, in order to prevent the performance of the radiated microwave of the antenna assembly 100 from being affected, the surface of the lifting shaft 421 for the insulator or the lifting shaft 421 is coated with an insulating layer.

It can be understood that when the auxiliary antenna assembly 4 is plural, the lifting device 42 of each auxiliary antenna assembly 4 can correspondingly drive the corresponding auxiliary antenna rod 41 to move axially, and the free ends of the different auxiliary antenna rods 41 are The distance between the grounding plates 1 can be adjusted by the corresponding lifting device 42 for the lifting of the respective auxiliary antenna rods 41. For example, when the auxiliary antenna assembly 4 is two, the lifting devices 42 of the two auxiliary antenna assemblies 4 respectively drive the respective auxiliary antenna rods 41 to move axially between the free ends of the two auxiliary antenna rods 41 and the grounding plate 1 The distance is the same or different. It can be understood here that the distance between the free end of the auxiliary antenna rod 41 and the grounding plate 1 is the length of the auxiliary antenna rod 41 which protrudes from the above side of the grounding plate 1.

Preferably, an insulating member 5 is disposed between each auxiliary antenna rod 41 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 to avoid The performance of the radiated microwave of the antenna assembly 100 due to the absence of the insulating member 5 is affected.

An antenna assembly 100 of a microwave oven according to an embodiment of the present invention, by arranging at least one auxiliary antenna assembly 4, and arranging each of the auxiliary antenna assemblies 4 on the grounding plate 1, each auxiliary antenna assembly 4 including an auxiliary antenna rod 41 and lifting The device 42 drives the corresponding auxiliary antenna rod 41 to move axially by using the lifting device 42 to adjust the distance between the free end of the corresponding auxiliary antenna rod 41 and the grounding plate 1, thereby facilitating the adjustment of the performance of the antenna assembly 100. When it is placed on a microwave oven, it is advantageous to improve the heating efficiency and uniformity of heating of the microwave oven.

In some embodiments of the present invention, as shown in FIG. 1, the distance between the free end of each auxiliary antenna rod 41 and the ground plate 1 is H1, and the maximum value of H1 is (λ/8) ± X mm. That is, the maximum length of the auxiliary antenna rod 41 that can protrude from the above side of the ground plate 1 is (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 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. Thereby the size and structure of the antenna assembly 100 is optimized.

Specifically, the horizontal distance between each of the auxiliary antenna rods 41 and the first antenna rod 2 is H2, that is, the side of each of the auxiliary antenna rods 41 remote from the first antenna rod 2 and the first antenna rod 2 The horizontal distance between the central axes is H2, H2 = (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 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 15 mm, 15.5 mm, or 25 mm. Thereby the size and structure of the antenna assembly 100 is optimized.

In some embodiments of the present invention, the vertical distance between the second antenna rod 3 and the grounding plate 1 is H3, that is, the vertical distance between the side of the second antenna rod 3 remote from the grounding plate 1 and the grounding plate 1 For H3, H3=(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, H3 is 30 mm, 31 mm, or 40 mm. Thereby the size and structure of the antenna assembly 100 is optimized.

According to some embodiments of the present invention, the length of the second antenna rod 3 is L, L = (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 pre- Set the 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, L is 30 mm, 31 mm, or 40 mm. Thereby the size and structure of the antenna assembly 100 is optimized.

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. Optionally, the semiconductor microwave source is disposed in one-to-one correspondence with the antenna assembly 100. Of course, the present invention is not limited thereto. In other embodiments, the plurality of antenna assemblies 100 may also correspond to one semiconductor microwave source.

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 cavity 200, and the first antenna rod 2 to the second antenna mast 3 are located within the cooking cavity 200, and the ground plate 1 is located outside the cooking cavity 200. That is, the first antenna rod 2 and the second antenna rod 3 are located within the cooking cavity 200, and the ground plate 1 is located on the outer side wall of the cooking cavity 200 such that a common ground is achieved between the ground plate 1 and the sidewall of the cooking cavity 200. Since the auxiliary antenna rod 41 of the auxiliary antenna assembly 4 is axially movable, the auxiliary antenna rod 41 can be moved axially from the placement chamber into the cooking chamber 200, and can also be moved axially from the cooking chamber 200 to the placement chamber. Preferably, a cooking chamber 200 of the microwave oven is provided with a cover through which microwaves can pass to cover the antenna assembly 100.

Each of the semiconductor microwave sources is disposed within the placement cavity to facilitate insertion of the first antenna rod 2 into the placement chamber for electrical connection with a semiconductor microwave source within the placement chamber. 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 the first antenna rod 2 of each antenna assembly 100 passes through the grounding plate 1 and the semiconductor microwave source. Electrical connection.

A control device is coupled to each of the lifting devices 42 to respectively control the lifting device 42 to drive the corresponding auxiliary antenna rod 41 shaft Move to. For example, the user can adjust the control device such that the control device controls one of the lifting devices 42 to drive the corresponding auxiliary antenna rod 41 to move axially according to the adjustment result of the user or the control device controls the plurality of lifting devices 42 to respectively drive the respective ones according to the adjustment result of the user. The auxiliary antenna rod 41 moves axially. When the plurality of lifting devices 42 are controlled, the plurality of lifting devices 42 drive the corresponding auxiliary antenna rods 41 to move axially differently, that is, the plurality of auxiliary antenna rods 41 protrude from the grounding plate 1 The length of one side can be different.

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.

As shown in FIG. 2, the inventors set up an antenna assembly 100 on the inner side wall of the cooking chamber 200 of the microwave oven in an actual study. The antenna assembly 100 includes: a grounding plate 1, a first antenna rod 2, a second antenna rod 3, and Two auxiliary antenna assemblies 4. 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. One end of the first antenna rod 2 is electrically connected to the semiconductor microwave source located in the placement cavity through the grounding plate 1. The second antenna rod 3 is disposed on the first antenna rod 2 and disposed in parallel with the ground plate 1, and each of the auxiliary antenna assemblies 4 is disposed on the ground plate 1. Each of the auxiliary antenna assemblies 4 includes an auxiliary antenna rod 41 and a lifting device 42. The lifting device 42 is located on a side of the grounding plate 1 remote from the second antenna rod 3, and one end of the auxiliary antenna rod 41 is connected to the lifting device 42 through the grounding plate 1. . The lifting device 42 is adapted to drive the corresponding auxiliary antenna rod 41 to move axially to adjust the distance between the free end of the auxiliary antenna rod 41 and the grounding plate 1.

The antenna assembly 100 has H1 of 15 mm, H2 of 15 mm, H3 of 30 mm, and L of 30 mm. The first antenna rod 2 to the second antenna rod 3 of the antenna assembly 100 are located in the cooking cavity 200. The grounding plate 1 is located outside the cooking cavity 200. The antenna assembly 100 needs to increase the cover capable of penetrating the microwave to ensure that the antenna assembly 100 does not Exposed in the cooking cavity 20020.

In the test, 1L of water is placed in the cooking chamber 200. When the H1 of the two auxiliary antenna rods 41 is 0, and the operating frequency of the microwave oven is constantly changing between 2.4 GHz and 2.5 GHz, the standing wave value of the cooking chamber 200 is as follows: Shown.

frequency	2.40	2.41	2.42	2.43	2.44	2.45	2.46	2.47	2.48	2.49	2.50
Standing wave value	2.3	2.2	1.6	1.9	3.1	1.3	1.5	2.4	3.4	1.5	2.6

It is understood by those skilled in the art that the smaller the standing wave value is, 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. 2 or less.

There are still many standing frequencies in the above table that do not meet the design requirements. The standing wave value is optimized by adjusting the distance between the free ends of the two auxiliary antenna rods 41 and the grounding plate 1, as follows:

2. The distance between one of the auxiliary antenna rods 41 and the grounding plate 1 is 2 mm at 2.40 GHz, and the distance between the other auxiliary antenna rod 41 and the grounding plate 1 is 3 mm, and a standing wave of 1.7 is obtained;

At 2.41 GHz, the distance between one of the auxiliary antenna rods 41 and the grounding plate 1 is 1 mm, and the distance between the other auxiliary antenna rod 41 and the grounding plate 1 is 5 mm, and a standing wave of 1.5 is obtained;

Adjusting the distance between one of the auxiliary antenna rods 41 and the grounding plate 1 at 2.44 GHz is 10 mm, another auxiliary day The distance between the wire rod 41 and the grounding plate 1 is 4 mm, and a standing wave of 1.4 is obtained;

2. The distance between one of the auxiliary antenna rods 41 and the grounding plate 1 is adjusted to be 3 mm at 2.47 GHz, and the distance between the other auxiliary antenna rod 41 and the grounding plate 1 is 7 mm, and a standing wave of 1.3 is obtained;

2. The distance between one of the auxiliary antenna rods 41 and the grounding plate 1 is 8 mm at 2.48 GHz, and the distance between the other auxiliary antenna rod 41 and the grounding plate 1 is 12 mm, and a standing wave of 1.5 is obtained;

At 2.50 GHz, the distance between one of the auxiliary antenna rods 41 and the grounding plate 1 is adjusted to be 9 mm, and the distance between the other auxiliary antenna rod 41 and the grounding plate 1 is 2 mm, and a standing wave of 1.8 is obtained.

Therefore, when the microwave oven is heated, by changing the operating frequency of the semiconductor microwave source, and adjusting the distance between the free end of the auxiliary antenna rod 41 and the grounding plate 1 on the basis of the microwave oven, the standing wave values can be guaranteed at different phases. Less than 2, so that the heating efficiency is higher and the heating uniformity is better.

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 (11)

1. 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 one end of the first antenna rod is electrically connected to the semiconductor microwave source through the ground plate ;

   a second antenna rod, the second antenna rod is disposed on the first antenna rod and disposed in parallel with the ground plate;

   At least one auxiliary antenna assembly, each of the auxiliary antenna assemblies being disposed on the ground plate, each of the auxiliary antenna assemblies including an auxiliary antenna rod and a lifting device, the lifting device being located away from the ground plate One side of the two antenna rods, one end of the auxiliary antenna rod is connected to the lifting device through the grounding plate, and the lifting device is adapted to drive the corresponding axial movement of the auxiliary antenna rod to adjust the auxiliary antenna The distance between the free end of the rod and the ground plate.
2. The antenna assembly of the microwave oven according to claim 1, wherein a distance between a free end of each of the auxiliary antenna rods and the ground plate is H1, and a maximum value of H1 is (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.
3. The antenna assembly of the microwave oven according to any one of claims 1 to 2, wherein a horizontal distance between each of the auxiliary antenna rods and the first antenna rod is H2, H2 = (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.
4. The antenna assembly of the microwave oven according to any one of claims 1 to 3, wherein a vertical distance between the second antenna rod and the ground plate is H3, H3 = (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.
5. The antenna assembly of the microwave oven according to any one of claims 1 to 4, wherein the length of the second antenna rod is L, L = (λ / 4) ± X mm, wherein λ = c / f , c is the speed of light, f is the working frequency, and X is the preset value.
6. An antenna assembly for a microwave oven according to any one of claims 2 to 5, wherein 2.4 GHz ≤ f ≤ 2.5 GHz.
7. An antenna assembly for a microwave oven according to any one of claims 2 to 5, wherein X = 0 mm or X = 10 mm.
8. The antenna assembly of the microwave oven according to any one of claims 1 to 7, wherein an insulating member is provided between the mating faces of the first antenna rod and the ground plate.
9. The antenna assembly of the microwave oven according to any one of claims 1 to 8, wherein the second antenna rod is symmetrically disposed with respect to the first antenna rod.
10. The antenna assembly of the microwave oven according to any one of claims 1 to 9, wherein the auxiliary antenna assembly is two.
11. 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 chamber, and the first antenna rod to the second antenna rod being located in the cooking chamber The ground plate is located outside the cooking cavity;

    And a control device coupled to the lifting device to control the lifting device to drive the auxiliary antenna rod to move axially.

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