Excitation structure and microwave oven

Abstract

The embodiment of the invention provides an excitation structure and a microwave oven, the excitation structure comprises a waveguide horn antenna and a surface wave generation assembly, and the waveguide horn antenna comprises a microwave transmission channel with a transmission inlet. The surface wave generation assembly comprises a seat body and a plurality of surface wave excitation structures, the seat body is provided with a surface wave generation cavity, the surface wave excitation structures are arranged in the surface wave generation cavity at intervals in the first direction, the two opposite ends of the surface wave generation cavity in the first direction are provided with a first communication port and a second communication port respectively, and the first communication port is communicated with the second communication port. And the microwave transmission channel is respectively communicated with the first communication port and the second communication port. The excitation structure provided by the embodiment of the invention can improve the heating uniformity.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to an excitation structure and a microwave oven. Background Technology

[0002] Microwave ovens, as products that can quickly heat food, are widely used in various aspects of society. As people's living standards improve, the demand for microwave ovens goes beyond just rapid reheating. Whether defrosting, reheating, or baking, there are extremely high requirements for the evenness of heating in microwave ovens.

[0003] In related technologies, microwave ovens primarily use a turntable, cavity bulges, stirring blades, and stirring antennas to disturb the electric field distribution inside the cavity, thereby altering the energy field distribution acting on the food. However, this method is ineffective in improving heating uniformity, making it difficult for microwave ovens to achieve good, uniform heating results. Summary of the Invention

[0004] In view of this, the main objective of the embodiments of this application is to provide an excitation structure and a microwave oven that can improve heating uniformity.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] The first aspect of this application provides an incentive structure, including:

[0007] A waveguide horn antenna, the waveguide horn antenna including a microwave transmission channel with a transmission inlet;

[0008] A surface wave generating assembly includes a base and multiple surface wave excitation structures. The base has a surface wave generating cavity. Each surface wave excitation structure is spaced apart in the surface wave generating cavity along a first direction. The surface wave generating cavity has a first communication port and a second communication port at opposite ends along the first direction. The microwave transmission channel is connected to the first communication port and the second communication port, respectively.

[0009] In one embodiment, the seat includes a first sidewall and a second sidewall spaced apart along the first direction, and the surface wave generating cavity is located between the first sidewall and the second sidewall;

[0010] A portion of the first sidewall is open to form the first communication opening; and / or,

[0011] A portion of the second sidewall is opened to form the second communication opening.

[0012] In one embodiment, the base includes a bottom wall located on the bottom side of the surface wave generating cavity, and each of the surface wave excitation structures is disposed on the bottom wall;

[0013] A portion of the bottom wall at one end along the first direction is open to form the first communication opening facing downwards; and / or,

[0014] A portion of the bottom wall at the other end along the first direction is open to form a downward-facing second communication port.

[0015] In one embodiment, the seat includes a bottom wall and a first side wall and a second side wall spaced apart along the first direction. The surface wave generating cavity is located between the first side wall and the second side wall. The bottom wall is located at the bottom side of the surface wave generating cavity. A portion of the bottom wall near the first side wall is open to form a first communication port with the opening facing downwards. A portion of the second side wall is open to form a second communication port.

[0016] In one embodiment, the first connection port includes a plurality of sub-connection ports;

[0017] Each of the sub-connecting ports is spaced apart along the first direction and extends along the second direction; or,

[0018] Each of the sub-connecting ports is spaced apart along the second direction and extends along the first direction;

[0019] The second direction is perpendicular to the first direction.

[0020] In one embodiment, the opening size of the sub-connecting port along the spacing direction is greater than or equal to 10 mm and less than or equal to 20 mm; and / or,

[0021] The opening size of the sub-connecting port along the extension direction is greater than or equal to 30 mm and less than or equal to 60 mm.

[0022] In one embodiment, at least a portion of the waveguide horn antenna is located on the bottom side of the bottom wall and extends along the first direction to communicate with the first communication port and the second communication port, respectively.

[0023] In one embodiment, the microwave transmission channel includes a first channel and a second channel, the waveguide horn antenna includes a transmission waveguide having the first channel and a horn antenna having the second channel, the first channel has the transmission inlet and is connected to the first communication port, the second channel is connected to the second communication port, the horn antenna is disposed on the outside of the second sidewall and extends to the bottom, and the transmission waveguide is located on the bottom side of the bottom wall and extends along the first direction, so that the first channel and the second channel are connected.

[0024] In one embodiment, a portion of the top side of the transmission waveguide is opened to form a third connection port, the third connection port being connected to both the first channel and the first connection port; and / or,

[0025] The transmission entry point is located at the end of the transmission waveguide furthest from the second channel.

[0026] In one embodiment, a portion of the surface wave excitation structure forms a first group of structures spaced apart along the first direction, and another portion of the surface wave excitation structure forms a second group of structures spaced apart along the first direction. The first group of structures and the second group of structures are spaced apart along a second direction, and the first connecting port and the second connecting port are respectively located at opposite ends of the spaced-apart structures along the first direction; wherein, the second direction is perpendicular to the first direction.

[0027] In one embodiment, the surface wave excitation structure is a metal corrugated sheet.

[0028] A second aspect of this application provides a microwave oven, including any of the excitation structures described above.

[0029] This application provides an excitation structure and a microwave oven. The excitation structure includes a waveguide horn antenna and a surface wave generating assembly. The base has a surface wave generating cavity, with a first connection port and a second connection port at opposite ends along a first direction. The microwave transmission channel of the waveguide horn antenna is connected to the first and second connection ports. After microwaves enter the microwave transmission channel from the transmission inlet, some microwaves are transmitted into the surface wave generating cavity from the first connection port, and another portion of microwaves is transmitted into the surface wave generating cavity from the second connection port. Simultaneously, since the first and second connection ports are located at opposite ends of the surface wave generating cavity along the first direction, and each surface wave excitation structure is spaced apart within the surface wave generating cavity along the first direction, the microwaves entering the surface wave generating cavity can be excited into surface waves by the surface wave excitation structure. By radiating uniform surface waves, the heating uniformity of the microwave oven can be improved. On the other hand, microwaves enter the surface wave generating cavity through the first and second connecting ports, which allows the microwaves to act more evenly on each surface wave excitation structure, making the electromagnetic energy distribution in the microwave oven cavity more uniform, thus further improving the effect of uniform heating of food. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an excitation structure according to an embodiment of this application;

[0031] Figure 2 for Figure 1 The front view;

[0032] Figure 3 for Figure 2 Top view;

[0033] Figure 4 for Figure 2 Side view;

[0034] Figure 5 This is a schematic diagram of an excitation structure according to another embodiment of this application;

[0035] Figure 6 for Figure 5 Top view.

[0036] Explanation of reference numerals in the attached figures

[0037] 10. Excitation structure; 11. Waveguide horn antenna; 11a. Microwave transmission channel; 11b. Transmission entrance; 11c. First channel; 11d. Second channel; 111. Transmission waveguide; 112. Horn antenna; 12. Surface wave generating assembly; 121. Base; 121a. Surface wave generating cavity; 121b. First connecting port; 121c. Second connecting port; 1211. First sidewall; 1212. Second sidewall; 1213. Bottom wall; 122. Surface wave excitation structure; 123. First group of structures; 124. Second group of structures. Detailed Implementation

[0038] In this application, the orientation or positional relationship of "top", "bottom", and "first direction" is based on the appendix. Figure 2 The orientation or positional relationship shown, the "second direction" orientation or positional relationship is based on the attached... Figure 3 The orientation or positional relationship shown is for illustrative purposes only and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0039] One embodiment of this application provides an excitation structure 10, please refer to... Figures 1 to 6 It includes a waveguide horn antenna 11 and a surface wave generating component 12. The waveguide horn antenna 11 has a microwave transmission channel 11a, and the microwave transmission channel 11a has a transmission inlet 11b.

[0040] The surface wave generating assembly 12 includes a base 121 and a plurality of surface wave excitation structures 122. The base 121 has a surface wave generating cavity 121a. Each surface wave excitation structure 122 is spaced apart in the surface wave generating cavity 121a along a first direction. The surface wave generating cavity 121a has a first communication port 121b and a second communication port 121c at opposite ends along the first direction. The microwave transmission channel 11a is connected to the first communication port 121b and the second communication port 121c respectively.

[0041] Another embodiment of this application provides a microwave oven, including the excitation structure 10 described in any embodiment of this application.

[0042] Specifically, the excitation structure 10 can be used to transmit microwaves and generate surface waves through excitation to heat food by means of surface waves.

[0043] The microwave transmission channel 11a transmits microwaves input from a microwave source to the surface wave generating cavity 121a. The microwaves generated by the microwave source are input into the microwave transmission channel 11a from the transmission inlet 11b and then into the surface wave generating cavity 121a via the waveguide horn antenna 11. Surface waves can be generated by the surface wave excitation structure 122 to heat the food in the cooking cavity.

[0044] It should be noted that the surface wave excitation structure 122 is a structure that excites uniform surface waves under the action of microwaves. Its specific structure can be set according to the actual situation, and it can be a metal corrugated structure or a dielectric strip array structure. For example, the surface wave excitation structure 122 is a metal corrugated sheet.

[0045] Specifically, the microwaves input from the microwave source are transmitted into the surface wave generating cavity 121a through the microwave transmission channel 11a, which can excite uniform longitudinal and transverse surface waves on each metal corrugated sheet. The surface wave energy can cover most of the microwave oven area and the generated reflections are small, thereby improving the heating uniformity.

[0046] Each surface wave excitation structure 122 is arranged at intervals along the first direction within the surface wave generating cavity 121a. It should be noted that the surface wave excitation structures 122 can be arranged in a row and at intervals along the first direction, or they can be arranged in multiple rows and at intervals along the first direction.

[0047] The first connection port 121b and the second connection port 121c are located at opposite ends of the surface wave generating cavity 121a along the first direction, and the microwave transmission channel 11a connects the first connection port 121b and the second connection port 121c. That is, there are at least two microwave transmission paths between the microwave transmission channel 11a and the surface wave generating cavity 121a. As a result, a portion of the microwaves transmitted along the microwave transmission channel 11a can enter the surface wave generating cavity 121a along the first connection port 121b, and another portion can enter the surface wave generating cavity 121a along the first connection port 121b. This allows the microwaves to act more evenly on each surface wave excitation structure 122.

[0048] In related technologies, microwave ovens only have a communication port at the front of the base for microwaves to enter. During the food heating process, the surface waves generated are absorbed by the food at the front, making it difficult for the food at the back to be heated, resulting in uneven heating.

[0049] The excitation structure 10 in this embodiment includes a waveguide horn antenna 11 and a surface wave generating assembly 12. The base 121 has a surface wave generating cavity 121a. The surface wave generating cavity 121a has a first connecting port 121b and a second connecting port 121c at opposite ends along a first direction. The microwave transmission channel 11a of the waveguide horn antenna 11 is connected to the first connecting port 121b and the second connecting port 121c. After microwaves enter the microwave transmission channel 11a from the transmission inlet 11b, under the transmission of the microwave transmission channel 11a, some microwaves can be transmitted from the first connecting port 121b into the surface wave generating cavity 121a, and another portion of microwaves can be transmitted from the second connecting port 121c into the surface wave generating cavity 121a. Simultaneously, since the first connecting port 121b and the second connecting port 121c are located at opposite ends of the surface wave generating cavity 121a along the first direction, and each surface wave excitation structure 122 is spaced apart within the surface wave generating cavity 121a along the first direction. Therefore, on the one hand, microwaves entering the surface wave generating cavity 121a can be excited into surface waves by the surface wave excitation structure 122. By radiating uniform surface waves, the heating uniformity of the microwave oven can be improved. On the other hand, microwaves enter the surface wave generating cavity 121a through the first connecting port 121b and the second connecting port 121c respectively, which allows the microwaves to act more uniformly on each surface wave excitation structure 122, making the electromagnetic energy distribution in the microwave oven cavity more uniform, thus further improving the effect of uniform heating of food.

[0050] In addition, the surface wave generating cavity 121a has a first connecting port 121b and a second connecting port 121c at opposite ends along the first direction. It should be noted that the specific configuration and position of the first connecting port 121b and the second connecting port 121c can be set according to the actual situation.

[0051] The first connecting port 121b can be located on the side wall of the base 121 or on the bottom wall 1213 of the base 121.

[0052] For example, the seat 121 includes a first sidewall 1211 and a second sidewall 1212 spaced apart along a first direction, a surface wave generating cavity 121a located between the first sidewall 1211 and the second sidewall 1212, and a portion of the first sidewall 1211 is open to form a first communication port 121b.

[0053] Specifically, the surface wave generating cavity 121a is provided with a first sidewall 1211 and a second sidewall 1212 at opposite ends along the first direction, wherein the first sidewall 1211 forms a first communication port 121b, so that microwaves in the microwave transmission channel 11a can enter the surface wave generating cavity 121a from the first sidewall 1211.

[0054] It should be noted that since each surface wave excitation structure 122 is spaced apart in the surface wave generating cavity 121a along the first direction, the opening of the first communication port 121b faces each surface wave excitation structure 122, which facilitates the generation of surface waves.

[0055] For example, the base 121 includes a bottom wall 1213 located on the bottom side of the surface wave generating cavity 121a, and each surface wave excitation structure 122 is disposed on the bottom wall 1213. A portion of one end of the bottom wall 1213 along the first direction is open to form a first communication port 121b with the opening facing downward.

[0056] Specifically, since the first connecting port 121b is located on the bottom wall 1213 and its opening faces downward, among the microwaves entering the surface wave generating cavity 121a through the first connecting port 121b, a portion of the microwaves can act on the surface wave excitation structure 122 to generate surface waves, while another portion of the microwaves will enter the cooking cavity to directly heat the food, thereby forming a composite heating method to further improve the heating uniformity.

[0057] The second connecting port 121c can be located on the side wall of the base 121 or on the bottom wall 1213 of the base 121.

[0058] For example, the seat 121 includes a first sidewall 1211 and a second sidewall 1212 spaced apart along a first direction, a surface wave generating cavity 121a located between the first sidewall 1211 and the second sidewall 1212, and a portion of the second sidewall 1212 is open to form a second communication port 121c.

[0059] Specifically, the second sidewall 1212 forms a second communication port 121c, allowing microwaves in the microwave transmission channel 11a to enter the surface wave generating cavity 121a from one side of the second sidewall 1212. Furthermore, the opening of the second communication port 121c faces each surface wave excitation structure 122, which facilitates the generation of surface waves.

[0060] For example, the base 121 includes a bottom wall 1213 located on the bottom side of the surface wave generating cavity 121a. Each surface wave excitation structure 122 is disposed on the bottom wall 1213. A portion of the bottom wall 1213 is open at the other end along the first direction to form a downward-facing second communication port 121c. Thus, among the microwaves entering the surface wave generating cavity 121a through the second communication port 121c, a portion of the microwaves can act on the surface wave excitation structure 122 to generate surface waves, while another portion of the microwaves will enter the cooking cavity to directly heat the food, thereby forming a composite heating method to further improve heating uniformity.

[0061] The first connecting port 121b and the second connecting port 121c can be located on the side walls of the seat body 121 on both sides, or both the first connecting port 121b and the second connecting port 121c can be located on the bottom wall 1213 of the seat body 121. Of course, one of the first connecting ports 121b and the second connecting port 121c can be located on the side wall of the seat body 121, and the other can be located on the bottom wall 1213 of the seat body 121.

[0062] In one embodiment, please refer to Figure 2 The seat 121 includes a bottom wall 1213 and a first side wall 1211 and a second side wall 1212 spaced apart along a first direction. The surface wave generating cavity 121a is located between the first side wall 1211 and the second side wall 1212. The bottom wall 1213 is located on the bottom side of the surface wave generating cavity 121a. A portion of the bottom wall 1213 near the first side wall 1211 is open to form a first communication port 121b with the opening facing downward. A portion of the second side wall 1212 is open to form a second communication port 121c.

[0063] Specifically, the first sidewall 1211, the second sidewall 1212 and the bottom wall 1213 enclose and form a surface wave generating cavity 121a. The base 121 may also include a platform located on the top side of the surface wave generating cavity 121a. The platform is used to carry food. The platform can be enclosed with the shell of the microwave oven located on its top side to form a cooking cavity. The food to be heated is placed in the cooking cavity.

[0064] It is understandable that the surface waves generated in the surface wave generating cavity 121a can be transmitted to the cooking cavity to heat the food inside the cooking cavity.

[0065] The first connecting port 121b is located on the bottom wall 1213 of the base 121, and the second connecting port 121c is located on the second side wall 1212. Thus, some microwaves enter the surface wave generating cavity 121a through the second connecting port 121c, and by acting on the surface wave excitation structure 122, generate uniform surface waves. The other portion of microwaves enters the surface wave generating cavity 121a through the first connecting port 121b; part of it acts on the surface wave excitation structure 122 to generate surface waves, while the other part directly enters the cooking cavity to heat the food.

[0066] It should be noted that the specific structural form of the first connecting port 121b can be set according to the actual situation.

[0067] For example, please see Figure 3 The first connecting port 121b includes multiple sub-connecting ports, each of which is spaced apart along a first direction and extends along a second direction, wherein the second direction is perpendicular to the first direction.

[0068] Specifically, by setting the first connection port 121b, the heating of the food located on the top side of the surface wave excitation structure 122 at the end away from the second connection port 121c can be supplemented. The sub-connection ports are set at intervals, thereby forming a slot antenna array as a whole, which can better improve the heating uniformity.

[0069] In some embodiments, the configuration of each sub-connection port can also be set according to the actual situation.

[0070] For example, please see Figure 6 The first connecting port 121b includes multiple sub-connecting ports, each of which is spaced apart along the second direction and extends along the first direction, wherein the second direction is perpendicular to the first direction.

[0071] Furthermore, the size of the sub-connection port should not be too small to prevent insufficient microwaves from entering the surface wave generating cavity 121a from the side closest to the first sidewall 1211, thus affecting heating uniformity. At the same time, the size of the sub-connection port should not be too large to prevent excessive microwaves from entering from that side, thus affecting heating uniformity.

[0072] For example, the opening size of the sub-connectors along the spacing direction is greater than or equal to 10 mm and less than or equal to 20 mm. Examples include 10 mm, 15 mm, or 20 mm. Here, the spacing direction refers to the direction in which the sub-connectors are arranged at intervals.

[0073] For example, the opening size of the sub-connector along the extension direction is greater than or equal to 30mm and less than or equal to 60mm. Such as 30mm, 45mm or 60mm.

[0074] In one embodiment, please refer to Figure 2 At least a portion of the waveguide horn antenna 11 is located on the bottom side of the bottom wall 1213 and extends along a first direction to communicate with the first communication port 121b and the second communication port 121c, respectively.

[0075] Specifically, the waveguide horn antenna 11 extends from the bottom side of the bottom wall 1213 along the first direction, which can reduce the area of ​​the waveguide horn antenna 11 outside the coverage of the surface wave generating component 12, and can maximize the size of the surface wave generating component 12, thereby increasing the space of the cooking cavity located on the top side of the surface wave generating component 12, so as to improve the usable volume ratio of the microwave oven.

[0076] In one embodiment, please refer to Figure 2The microwave transmission channel 11a includes a first channel 11c and a second channel 11d. The waveguide horn antenna 11 includes a transmission waveguide 111 with the first channel 11c and a horn antenna 112 with the second channel 11d. The first channel 11c has a transmission inlet 11b and is connected to a first connection port 121b. The second channel 11d is connected to the second connection port 121c. The horn antenna 112 is disposed on the outside of the second sidewall 1212 and extends to the bottom. The transmission waveguide 111 is located on the bottom side of the bottom wall 1213 and extends along a first direction so that the first channel 11c is connected to the second channel 11d.

[0077] It should be noted that the transmission entry 11b can be located at the end of the transmission waveguide 111 away from the second channel 11d, and the transmission entry 11b can be located on the side of the first channel 11c near the first connection port 121b.

[0078] Therefore, the microwaves entering the first channel 11c from the transmission inlet 11b are transmitted along the extension direction of the first channel 11c. A portion enters the surface wave generating cavity 121a through the first connecting port 121b, while the other portion continues to be transmitted along the first channel 11c to the second channel 11d, then propagates upwards along the second channel 11d and is input into the surface wave generating cavity 121a through the second connecting port 121c. This allows for the generation of uniform surface waves in the surface wave generating cavity 121a, enabling uniform heating of the food within the cooking cavity.

[0079] Of course, in some embodiments, the transmission entry 11b may also be located at one end of the transmission waveguide 111 near the second channel 11d.

[0080] In one embodiment, a portion of the top side of the transmission waveguide 111 is opened to form a third connection port, which is connected to the first channel 11c and the first connection port 121b, respectively.

[0081] Specifically, the top wall of the transmission waveguide 111 is located on the bottom side of the bottom wall 1213 of the base 121, and the top side of the top wall of the transmission waveguide 111 forms a third connection port corresponding to the first connection port 121b, so as to communicate with the first connection port 121b. Thus, the microwaves transmitted along the first channel 11c can enter the surface wave generating cavity 121a after passing through the third connection port and the first connection port 121b.

[0082] It should be noted that the third connection port can be configured in the same position and manner as the first connection port 121b to facilitate microwave transmission. Of course, the third connection port can also be configured in different ways.

[0083] In other embodiments, the transmission waveguide 111 may not have a top wall, or the top wall of the transmission waveguide 111 may have an opening in the area covered by the bottom wall 1213 of the base 121, with the bottom wall 1213 of the base 121 covering and sealing the opening. This saves material, and the third connecting port may not be provided on the top side of the transmission waveguide 111, as this facilitates processing and shaping.

[0084] In one embodiment, please refer to Figure 3 A portion of the surface wave excitation structure 122 forms a first group of structures 123 at intervals along the first direction, and another portion of the surface wave excitation structure 122 forms a second group of structures 124 at intervals along the first direction. The first group of structures 123 and the second group of structures 124 are arranged at intervals along the second direction. The first connecting port 121b and the second connecting port 121c are respectively arranged at opposite ends of the interval along the first direction, wherein the second direction is perpendicular to the first direction.

[0085] Specifically, each surface wave excitation structure 122 is divided into a first group of structures 123 and a second group of structures 124 spaced apart along a second direction. The surface wave excitation structures 122 in the first group of structures 123 are spaced apart along the first direction, and the surface wave excitation structures 122 in the second group of structures 124 are also spaced apart along the first direction. The first connecting port 121b and the second connecting port 121c are located at the interval between the first group of structures 123 and the second group of structures 124, respectively at opposite ends of the interval. This allows microwaves to act more uniformly on each surface wave excitation structure 122, further improving the uniform heating effect on food.

[0086] In one embodiment, the base 121 includes a base and a stage, with the stage covering the top side of the base to jointly enclose and form a surface wave generating cavity 121a. At least a portion of the stage on the side near the horn antenna 112 extends to the top side of the horn antenna 112. In a projection plane parallel to the stage, the projection of at least a portion of the horn antenna 112 coincides with the projection of a portion of the stage.

[0087] Specifically, the entire area of ​​the side of the platform near the horn antenna 112 can extend to the top side of the horn antenna 112, or a portion of the side of the platform near the horn antenna 112 can extend to the top side of the horn antenna 112.

[0088] In a projection plane parallel to the stage, the projection of at least a portion of the horn antenna 112 coincides with the projection of a portion of the stage. The extended region of the stage can cover part or all of the horn antenna 112, meaning that part or all of the horn antenna 112 is located on the underside of the extended region of the stage. From a projection perspective, the projections of the two partially overlap.

[0089] Therefore, by extending the platform, the size of the platform can be increased, thereby expanding the area of ​​the cooking cavity formed by the platform and the housing, and reducing the area of ​​the waveguide horn antenna 11 outside the coverage of the platform, thus further improving the usable volume ratio of the microwave oven, while also facilitating assembly.

[0090] It should be noted that the stage can be extended only on the side closest to the horn antenna 112. Of course, depending on the actual situation, the sidewalls of the other sides of the stage can also extend outwards.

[0091] In one specific embodiment, by housing a portion of the waveguide horn antenna 11 within the surface wave generating cavity 121a, the structural size of the waveguide horn antenna 11 located outside the surface wave generating cavity 121a can be reduced by 40%, and the usable volume ratio of the microwave oven can be increased by 10%.

[0092] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0093] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. An excitation structure, characterized in that, include: A waveguide horn antenna, the waveguide horn antenna including a microwave transmission channel with a transmission inlet; A surface wave generating assembly includes a base and multiple surface wave excitation structures. The base has a surface wave generating cavity. Each surface wave excitation structure is spaced apart in the surface wave generating cavity along a first direction. The surface wave generating cavity has a first communication port and a second communication port at opposite ends along the first direction. The microwave transmission channel is connected to the first communication port and the second communication port, respectively.

2. The excitation structure according to claim 1, characterized in that, The seat includes a first sidewall and a second sidewall spaced apart along the first direction, and the surface wave generating cavity is located between the first sidewall and the second sidewall; A portion of the first sidewall is opened to form the first communication opening; And / or, A portion of the second sidewall is opened to form the second communication opening.

3. The excitation structure according to claim 1, characterized in that, The base includes a bottom wall located on the bottom side of the surface wave generating cavity, and each of the surface wave excitation structures is disposed on the bottom wall; A portion of the bottom wall at one end along the first direction is open to form the first communication opening facing downwards; And / or, A portion of the bottom wall at the other end along the first direction is open to form a downward-facing second communication port.

4. The excitation structure according to claim 1, characterized in that, The seat includes a bottom wall and a first side wall and a second side wall spaced apart along the first direction. The surface wave generating cavity is located between the first side wall and the second side wall. The bottom wall is located at the bottom of the surface wave generating cavity. A portion of the bottom wall near the first side wall is open to form a first communication port with the opening facing downwards. A portion of the second side wall is open to form a second communication port.

5. The excitation structure according to claim 4, characterized in that, The first connection port includes multiple sub-connection ports; Each of the sub-connecting ports is spaced apart along the first direction and extends along the second direction; or, Each of the sub-connecting ports is spaced apart along the second direction and extends along the first direction; The second direction is perpendicular to the first direction.

6. The excitation structure according to claim 5, characterized in that, The opening size of the sub-connecting port along the spacing direction is greater than or equal to 10 mm and less than or equal to 20 mm; and / or, The opening size of the sub-connecting port along the extension direction is greater than or equal to 30 mm and less than or equal to 60 mm.

7. The excitation structure according to any one of claims 4-6, characterized in that, At least a portion of the waveguide horn antenna is located on the bottom side of the bottom wall and extends along the first direction to communicate with the first communication port and the second communication port, respectively.

8. The excitation structure according to claim 7, characterized in that, The microwave transmission channel includes a first channel and a second channel. The waveguide horn antenna includes a transmission waveguide having the first channel and a horn antenna having the second channel. The first channel has the transmission inlet and is connected to the first communication port. The second channel is connected to the second communication port. The horn antenna is disposed on the outside of the second sidewall and extends to the bottom. The transmission waveguide is located on the bottom side of the bottom wall and extends along the first direction, so that the first channel is connected to the second channel.

9. The excitation structure according to claim 8, characterized in that, A portion of the top side of the transmission waveguide is opened to form a third connection port, which is connected to both the first channel and the first connection port; and / or The transmission entry point is located at the end of the transmission waveguide furthest from the second channel.

10. The excitation structure according to any one of claims 1-4, characterized in that, A portion of the surface wave excitation structure forms a first group of structures spaced apart along the first direction, and another portion of the surface wave excitation structure forms a second group of structures spaced apart along the first direction. The first group of structures and the second group of structures are spaced apart along the second direction, and the first connecting port and the second connecting port are respectively located at opposite ends of the spaced-apart structure along the first direction; wherein, the second direction is perpendicular to the first direction.

11. The excitation structure according to any one of claims 1-6, characterized in that, The surface wave excitation structure is a metal corrugated sheet.

12. A microwave oven, characterized in that, Includes the excitation structure described in any one of claims 1-11.

Images