Planar antenna and microwave oven

Abstract

The invention provides a planar antenna and a microwave oven, the planar antenna comprises a radiation main body and a terminal, the radiation main body is used for generating directional electromagnetic waves, the radiation main body is provided with a plurality of long edges and a plurality of chamfered edges, the plurality of long edges jointly control the antenna frequency and the S parameter, and each chamfered edge controls the S parameter of the antenna; the terminal is connected with the radiation main body, and is fed to the radiation main body to form a single-stage planar antenna; according to the planar antenna, fine adjustment and optimization of the antenna frequency and the S parameter are realized through the plurality of long edges and the plurality of chamfered edges arranged on the radiation main body, the design not only improves the integration level and reliability of the antenna, but also enables the antenna to adapt to complex communication environments and various frequency band requirements, and more importantly, the planar antenna is applied to a microwave oven, so that the application range of the planar antenna is widened. The temperature of each point in the microwave oven can be controlled in a differentiated mode, advantage heating of different frequencies and different space points is achieved, and therefore the heating requirements of different food materials and different cooking requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna manufacturing in the home appliance industry, and particularly relates to a planar antenna and a microwave oven. Background Art

[0002] In the context of the rapid development and continuous innovation of wireless communication technologies, as a core component of wireless communication devices, the improvement and optimization of the performance of antennas are crucial for enhancing the communication quality and efficiency of the entire communication system. With the continuous progress of modern communication technologies, modern communication devices have put forward higher requirements for the performance of antennas, such as pursuing higher gain, wider frequency band coverage, more stable radiation characteristics, and better electromagnetic compatibility, etc. Especially in specific application scenarios such as microwave ovens, the performance of the antenna is directly related to the heating effect of the microwave oven and the accuracy of internal temperature control.

[0003] Traditional antenna designs, such as helical antennas, parabolic antennas, etc., although they meet the requirements of early communication technologies to a certain extent, their complex three-dimensional structures, high manufacturing costs, and large volumes pose many challenges in the miniaturization, lightweight, and integration of modern communication devices. Therefore, planar antennas have gradually become a research hotspot in the field of wireless communication due to their advantages such as simple structure, easy integration, low manufacturing cost, and good electromagnetic compatibility.

[0004] In the design of planar antennas, in order to optimize the antenna performance, structures with various geometric shapes are widely applied to the radiation body, such as slots, patches, dipoles, etc. Among them, the flat plate structure has received extensive attention in the design of planar antennas due to its unique geometric shape and electromagnetic characteristics. The flat plate structure can provide a uniform current distribution, which helps to achieve broadband characteristics, etc.

[0005] However, although the flat plate structure has shown many advantages in the design of planar antennas, there are still some key problems to be solved in the existing planar antenna designs based on the flat plate structure. Some designs only control the frequency and S-parameters (i.e., scattering parameters, used to describe the transmission and reflection characteristics between antenna ports) of the antenna through simple flat plate patches or slots. This design method has limitations in achieving fine adjustment of antenna performance. Especially in the face of complex communication environments and various frequency band requirements, this simple design method seems inadequate.

[0006] In addition, although some designs use multiple flat plate structures, there is a lack of an effective cooperation mechanism between the flat plate structures, resulting in insignificant improvement in the overall performance of the antenna. Moreover, in the optimization of the antenna S-parameters, the existing designs often rely too much on the adjustment of the overall size of the flat plate structure, while ignoring the detailed design of the edge part of the flat plate structure, thus limiting the further improvement space of the antenna performance.

[0007] In the field of microwave heating, traditional microwave ovens usually use a control circuit to control a magnetron to continuously generate microwaves, which are then coupled into the cooking cavity through a waveguide system. In order to evenly distribute the microwave energy in the cooking cavity, a rotatable metal fan stirrer is usually equipped. However, this design has obvious deficiencies: when the materials, shapes, sizes, or placement positions of the food inside the microwave oven are different, due to the uncontrollable temperature in each space inside the microwave oven, the food is unevenly heated, and even burned. In addition, traditional microwave ovens generally adopt a single magnetron design. Although it can achieve the temperature uniformity in each space inside the microwave oven, this uniformity is fixed and uncontrollable, and cannot meet the differential heating requirements under different ingredients and different cooking needs.

[0008] The disclosure of the above background technical content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application, nor will it necessarily give technical teachings; in the case where there is no clear evidence indicating that the above content has been publicly disclosed before the filing date of this patent application, the above background technology should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention proposes a planar antenna and a microwave oven. By providing a plurality of long sides and a plurality of chamfered edges on the radiation body, fine adjustment and optimization of the antenna frequency and S parameters are achieved. This design not only improves the integration and reliability of the antenna, but also enables it to adapt to complex communication environments and various frequency band requirements. More importantly, when this planar antenna is applied in a microwave oven, it can achieve differential control of the temperature at each point inside the microwave oven, realize the optimal heating at different frequencies and different spatial points, so as to meet the heating requirements under different ingredients and different cooking needs, and improve the heating effect of the microwave oven and the accuracy of internal temperature control.

[0010] In order to achieve the above object, the technical solution of the present invention is as follows:

[0011] The present invention provides a planar antenna, including:

[0012] A radiation body for generating a directional electromagnetic wave, wherein a plurality of long sides and a plurality of chamfered edges are provided on the radiation body, the plurality of long sides jointly control the antenna frequency and S parameters, and each chamfered edge controls the antenna S parameter;

[0013] A terminal connected to the radiation body, and the radiation body is fed by the terminal to form a single-stage flat plate antenna.

[0014] The present invention provides a planar antenna and a microwave oven. By providing a plurality of long sides and a plurality of chamfered edges on the radiation body, fine adjustment and optimization of the antenna frequency and S-parameters are achieved. This design not only improves the integration and reliability of the antenna, but also enables it to adapt to complex communication environments and various frequency band requirements. More importantly, when this planar antenna is applied in a microwave oven, it can achieve differential control of the temperature at each point inside the microwave oven, realizing optimal heating at different frequencies and different spatial points, thereby meeting the heating requirements under different food ingredients and different cooking needs, and improving the heating effect of the microwave oven and the accuracy of internal temperature control.

[0015] As a preferred technical solution, there are at least four long sides, among which:

[0016] The first long side, together with a part of the second long side, the third long side, and the fourth long side, jointly controls the frequency and S-parameters of the antenna;

[0017] The second long side, together with a part of the first long side, the third long side, and the fourth long side, jointly controls the frequency and S-parameters of the antenna;

[0018] The third long side, together with a part of the first long side, the second long side, and the fourth long side, jointly controls the frequency and S-parameters of the antenna;

[0019] The fourth long side, together with a part of the first long side, the second long side, and the third long side, jointly controls the frequency and S-parameters of the antenna;

[0020] There are at least two chamfered edges, and the chamfered edges are arranged in correspondence.

[0021] As a preferred technical solution, the terminal includes: a radiation body locking and positioning assembly, and the radiation body locking and positioning assembly includes: a radiation body positioning member and a locking member. One end of the radiation body positioning member passes through the radiation body and the radiation body positioning member is connected to the radiation body through the locking member.

[0022] As a preferred technical solution, the radiation body locking and positioning assembly includes: an anti-slip gasket and a support platform. One end face of the radiation body positioning member is externally provided on the locking member to form a radiation body positioning plane. The anti-slip gasket is arranged between one end face of the radiation body and the locking member, and the other end of the radiation body positioning member is connected to one end face of the support platform.

[0023] As a preferred technical solution, the terminal includes: a first transition section and an antenna inner conductor rod. The other end face of the support platform is connected to one end of the antenna inner conductor rod through the first transition section.

[0024] As a preferred technical solution, the terminal includes: a positioning and fixing assembly, and the positioning and fixing assembly includes: a fixing stopper and a terminal male fastener. The other end of the inner conductor rod of the antenna is connected to one end of the fixing stopper, the other end of the fixing stopper is connected to one end of the terminal male fastener, a fastener is provided upward on the outer periphery of the terminal male fastener near one end of the fixing stopper, and a terminal male positioning plane is provided on the outer side wall of the terminal male fastener.

[0025] As a preferred technical solution, the terminal includes: a terminal female head limit post and a first feeding ground piece. The other end of the terminal male fastener is connected to one end of the terminal female head limit post, and the other end of the terminal female head limit post is connected to one end of the first feeding ground piece through a second transition section.

[0026] As a preferred technical solution, the terminal includes: a third transition section, a terminal male head snap ring, a fourth transition section, and a second feeding ground piece. The other end of the first feeding ground piece is connected to one end of the terminal male head snap ring through the third transition section, and the other end of the terminal male head snap ring is connected to the second feeding ground piece through the fourth transition section.

[0027] The present invention also provides a microwave oven, including: the planar antenna as described in any one of the above. At least two planar antennas are provided, and the planar antennas are installed on the top of the microwave oven body through a radiation main body locking and positioning assembly. A coupling connection is formed between the planar antennas and one end face of the microwave oven body to generate a downward radiation electric field, and the beam direction, beam shape, and beam width are controlled by adjusting the phase difference between the planar antennas.

[0028] As a preferred technical solution, it includes:

[0029] A phase adjuster for adjusting the phase difference between the planar antennas;

[0030] A temperature probe for collecting temperature data inside the microwave oven body in real time;

[0031] A controller, the temperature probe is electrically connected to the phase adjuster through the controller. The controller is used for controlling the phase adjuster to adjust the phase difference between the planar antennas according to the received temperature data inside the microwave oven body, so as to achieve optimal heating at different frequencies and different spatial points inside the microwave oven body.

[0032] A planar antenna and a microwave oven provided by the present invention have the following beneficial effects:

[0033] 1) By setting multiple long sides and multiple chamfered edges on the radiation body, fine adjustment and optimization of the antenna frequency and S-parameters are achieved. This design not only improves the integration and reliability of the antenna, but also enables it to adapt to complex communication environments and various frequency band requirements. More importantly, when this planar antenna is applied in a microwave oven, it can achieve differential control of the temperature at each point inside the microwave oven, realizing optimal heating at different frequencies and different spatial points, thereby meeting the heating requirements under different food ingredients and different cooking needs, and improving the heating effect of the microwave oven and the accuracy of internal temperature control;

[0034] 2) The design and arrangement of the long sides will directly affect the resonant frequency of the antenna. By adjusting the design and arrangement of the long sides, precise adjustment of the antenna operating frequency can be achieved to meet specific frequency band requirements. The S-parameters (scattering parameters) are important parameters describing the characteristics of the antenna ports, including the reflection coefficient (S11), etc. The design of the long sides also helps to optimize these parameters, reduce signal reflection and loss, and improve the radiation efficiency of the antenna. The design of the chamfered edges can further fine-tune the S-parameters of the antenna, especially the reflection coefficient, to optimize the matching characteristics of the antenna; the design of the chamfered edges can further reduce signal reflection and improve the performance of the antenna;

[0035] Applying this planar antenna in a microwave oven can achieve differential heating by utilizing the characteristics of its directional electromagnetic waves; due to the fine adjustment of the antenna frequency and S-parameters, the distribution of electromagnetic waves inside the microwave oven can be more uniform or have specific directivity, thereby realizing differential control of the temperature at each point inside the microwave oven;

[0036] Different food ingredients and cooking needs have different requirements for the heating method; by adjusting the frequency and S-parameters of the antenna, the distribution of electromagnetic waves can be optimized to have an optimal heating effect at different frequencies and different spatial points; in this way, the heating requirements of different food ingredients can be met, and the heating effect of the microwave oven and the accuracy of internal temperature control can be improved;

[0037] The design of this planar antenna not only improves the integration of the antenna, making it more compact and easier to install, but also improves the reliability of the antenna through fine adjustment and optimization; this is particularly important for devices such as microwave ovens that require long-term stable operation.

[0038] 3) In the design of the planar antenna, there are at least four long sides, and each long side jointly controls the antenna frequency and S-parameters with a part of the other three long sides; this design utilizes the principle of multipath interference, that is, when electromagnetic waves propagate on the long sides, reflection and interference will occur, thus affecting the resonant frequency and S-parameters of the antenna; by precisely adjusting the size, shape and arrangement of the long sides, fine adjustment of the antenna frequency and S-parameters can be achieved. For example, adjusting the shape and arrangement of the long sides can optimize the S-parameters and reduce signal reflection and loss;

[0039] The design of the chamfered edge further increases the fine-tuning ability of the antenna S-parameters; the chamfered edges are arranged in correspondence, which can further optimize the matching characteristics of the antenna, reduce signal reflection, and improve the radiation efficiency of the antenna; the design of the chamfered edge can also be used to adjust the directivity and polarization characteristics of the antenna, so as to meet the requirements of specific communication environments;

[0040] Applying this planar antenna to a microwave oven can utilize the characteristics of its directional electromagnetic waves to achieve differential heating; due to the fine adjustment of the antenna frequency and S-parameters, the distribution of electromagnetic waves inside the microwave oven can be more uniform or have specific directivity; by adjusting the frequency and S-parameters of the antenna, the propagation path and intensity distribution of electromagnetic waves inside the microwave oven can be controlled, so as to achieve differential control of the temperature at each point inside the microwave oven;

[0041] Different food ingredients and cooking requirements have different requirements for the heating method; by adjusting the frequency and S-parameters of the antenna, the distribution of electromagnetic waves can be optimized to have an advantageous heating effect at different frequencies and different spatial points. For example, for food ingredients that need to be quickly heated, a higher antenna frequency and optimized S-parameters can be selected to form stronger hot spots of electromagnetic waves inside the microwave oven; while for food ingredients that need to be evenly heated, a lower antenna frequency and optimized S-parameters can be selected to form a more uniform heating distribution of electromagnetic waves inside the microwave oven.

[0042] 4) By adjusting the phase difference between the first planar antenna and the second planar antenna, the direction and shape of the beam can be controlled; this technology is called phased array technology. Utilizing the interference and superposition effects of waves, the signal can be focused in a specific direction, thereby improving the heating effect and reliability of a certain area inside the microwave oven, so as to achieve uniform heating of different food ingredients inside the microwave oven; the change of the phase not only affects the direction of the beam, but also can change the width of the beam; by adjusting the phase difference between the first planar antenna and the second planar antenna, beam narrowing or widening can be achieved to adapt to the heating of foods with different positions and different volumes inside the microwave oven;

[0043] The temperature probe is used to collect the temperature data inside the microwave oven body in real time, and the controller is used to control the phase adjuster to adjust and change the phase difference between the first planar antenna and the second planar antenna according to the received temperature data inside the microwave oven body, weaken the heating effect of the high-temperature point of the food in real time, and enhance the heating effect of the low-temperature point, so as to achieve uniform heating; in addition, by changing the phase difference between the first planar antenna and the second planar antenna, the heating effect of a certain area of the food is weakened in real time, and the heating effect of another area is enhanced, so as to achieve differential control of the temperature at each point inside the microwave oven. Description of the Drawings

[0044] Figure 1 Schematic structural diagram of a planar antenna provided by the present invention;

[0045] Figure 2 Schematic structural diagrams of a planar antenna provided by the present invention from different perspectives;

[0046] Figure 3 Schematic structural diagrams of a planar antenna provided by the present invention from different perspectives;

[0047] Figure 4 Schematic structural diagrams of a planar antenna provided by the present invention from different perspectives;

[0048] Figure 5 Schematic structural diagram of a microwave oven provided by the present invention;

[0049] Figure 6 Frequency return loss and efficiency diagram of a first planar antenna in a microwave oven provided by the present invention;

[0050] Figure 7 Frequency return loss and efficiency diagram of a second planar antenna in a microwave oven provided by the present invention;

[0051] Figure 8 Heating effect diagrams of placing 5 identical food ingredients in different areas in the microwave oven provided by the present invention;

[0052] Wherein, 1 - radiation body; 2 - terminal; 3 - long side; 31 - first long side; 32 - second long side; 33 - third long side; 34 - fourth long side; 4 - chamfered edge; 5 - radiation body positioning member; 51 - radiation body positioning plane; 6 - locking member; 7 - anti-slip gasket; 8 - support platform; 9 - first transition section; 10 - antenna inner conductor rod; 11 - fixed stop member; 12 - terminal male fastener; 13 - fastener; 14 - terminal male positioning plane; 15 - terminal female limit post; 16 - second transition section; 17 - first feed-in ground member; 18 - third transition section; 19 - terminal male snap ring; 20 - fourth transition section; 21 - second feed-in ground member; 22 - microwave oven body; 23 - planar antenna; 24 - first planar antenna; 25 - second planar antenna. Detailed description of the specific implementation mode

[0053] The preferred implementation modes of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] As Figure 1-4 shown, the present invention provides a planar antenna, including:

[0055] Radiation body 1, the radiation body 1 is used to generate directional electromagnetic waves, and a plurality of long sides 3 and a plurality of chamfered edges 4 are provided on the radiation body 1. The plurality of long sides 3 jointly control the antenna frequency and S parameters, and each chamfered edge 4 controls the antenna S parameters;

[0056] Terminal 2, the terminal 2 is connected to the radiation body 1, and is fed from the terminal to the radiation body 1 to form a single-stage planar antenna.

[0057] The present invention proposes a planar antenna and a microwave oven. By providing a plurality of long sides and a plurality of chamfered edges on the radiation body, fine adjustment and optimization of the antenna frequency and S parameters are achieved. This design not only improves the integration and reliability of the antenna, but also enables it to adapt to complex communication environments and various frequency band requirements. More importantly, applying this planar antenna in a microwave oven can achieve differential control of the temperature at each point inside the microwave oven, realize the optimal heating at different frequencies and different spatial points, so as to meet the heating requirements under different food ingredients and different cooking needs, and improve the heating effect and the accuracy of internal temperature control of the microwave oven.

[0058] Preferably, as Figure 1-4 shown, there are at least four long sides 3, among which:

[0059] The first long side 31 and a part of the second long side 32, the third long side 33 and the fourth long side 34 jointly control the frequency and S parameters of the antenna;

[0060] The second long side 32 and a part of the first long side 31, the third long side 33 and the fourth long side 34 jointly control the frequency and S parameters of the antenna;

[0061] The third long side 33 and a part of the first long side 31, the second long side 32 and the fourth long side 34 jointly control the frequency and S parameters of the antenna;

[0062] The fourth long side 34 and a part of the first long side 31, the second long side 32 and the third long side 33 jointly control the frequency and S parameters of the antenna;

[0063] There are at least two chamfered edges 4, and the chamfered edges 4 are arranged correspondingly;

[0064] In the design of the planar antenna, there are at least four long sides 3, and each long side 3 jointly controls the frequency and S parameters of the antenna with a part of the other three long sides 3; this design utilizes the principle of multipath interference, that is, when electromagnetic waves propagate on the long side 3, reflection and interference will occur, thereby affecting the resonant frequency and S parameters of the antenna; by precisely adjusting the size, shape and arrangement of the long sides, fine adjustment of the antenna frequency and S parameters can be achieved. For example, adjusting the shape and arrangement of the long side 3 can optimize the S parameters and reduce signal reflection and loss;

[0065] The design of the chamfered edge 4 further increases the ability to finely tune the antenna S-parameters; the chamfered edges 4 are arranged in correspondence, which can further optimize the matching characteristics of the antenna, reduce signal reflection, and improve the radiation efficiency of the antenna; the design of the chamfered edge 4 can also be used to adjust the directivity and polarization characteristics of the antenna, so as to meet the requirements of specific communication environments.

[0066] Preferably, as Figure 1-4 shown, the terminal 2 includes: a radiation body locking and positioning assembly, and the radiation body locking and positioning assembly includes: a radiation body positioning member 5 and a locking member 6. One end of the radiation body positioning member 5 passes through the radiation body 1 and the locking member 6 connects the radiation body positioning member 5 to the radiation body 1; the tight fit of the radiation body positioning member 5 and the locking member 6 can ensure a stable and reliable electrical connection between the radiation body 1 and the terminal 2; this is crucial for the performance of the antenna because unstable electrical connections may cause problems such as signal loss and frequency offset, thus affecting the overall performance of the antenna; through precise positioning and locking, the gap and looseness between the radiation body 1 and other components can be reduced, thereby reducing the possibility of electromagnetic interference; this is of great significance for improving the anti-interference ability and signal quality of the antenna; the design of the radiation body locking and positioning assembly makes the installation process of the antenna simpler and faster; the operator only needs to pass the radiation body positioning member 5 through the radiation body 1 and use the locking member 6 for fixation, without the need for complex adjustment and calibration; when the antenna needs maintenance or replacement, the radiation body 1 can be easily removed from the terminal 2 by loosening the locking member 6, thus simplifying the maintenance process and reducing the maintenance cost.

[0067] Preferably, as Figure 1-4 shown, the radiation body locking and positioning assembly includes: an anti-slip gasket 7 and a support platform 8. One end face of the radiation body positioning member 5 is externally provided on the locking member 6 to form a radiation body positioning plane 51. The anti-slip gasket 7 is arranged between one end face of the radiation body 1 and the locking member 6. The other end of the radiation body positioning member 5 is connected to one end face of the support platform 8. The anti-slip gasket 7 prevents loosening between the locking member 6 and the radiation body 1.

[0068] Preferably, as Figure 1-4As shown, the terminal 2 includes: a first transition section 9 and an antenna inner conductor rod 10. The other end face of the support platform 8 is connected to one end of the antenna inner conductor rod 10 through the first transition section 9. The first transition section 9 serves as a connection bridge between the support platform 8 and the antenna inner conductor rod 10, ensuring that the electrical connection between the two is stable and reliable. This is crucial for the performance of the antenna because unstable electrical connections may cause problems such as signal loss and frequency offset. By firmly connecting the support platform 8 and the antenna inner conductor rod 10 through the first transition section 9, the stability of the entire antenna can be enhanced, which helps to ensure that the antenna can maintain the stability and reliability of its performance during long-term use.

[0069] Preferably, as Figure 1-4 shown, the terminal 2 includes: a positioning and fixing assembly. The positioning and fixing assembly includes: a fixing stopper 11 and a terminal male fastener 12. The other end of the antenna inner conductor rod 10 is connected to one end of the fixing stopper 11, and the other end of the fixing stopper 11 is connected to one end of the terminal male fastener 12. A fastener 13 is provided upward on the outer periphery of the terminal male fastener 12 near one end of the fixing stopper 11, and a terminal male positioning plane 14 is provided on the outer side wall of the terminal male fastener 12. The fixing stopper 11 plays a role of connection and support. This connection ensures the stable position of the antenna inner conductor rod 10 in the terminal 2, preventing it from loosening or displacing during use. By closely combining the terminal male fastener 12 with the fixing stopper 11, it can also play a role of protection and isolation, which can prevent impurities such as moisture and dust in the external environment from entering the terminal and affecting the performance and lifespan of the antenna.

[0070] Preferably, as Figure 1-4 shown, the terminal 2 includes: a terminal female limit post 15 and a first feed-in ground piece 17. The other end of the terminal male fastener 12 is connected to one end of the terminal female limit post 15, and the other end of the terminal female limit post 15 is connected to one end of the first feed-in ground piece 17 through a second transition section 16. The main function of the terminal female limit post 15 is for limiting and fixing. One end of it is connected to the terminal male fastener 12, ensuring the stability and accuracy of the terminal male during the connection process. Through the design of the terminal female limit post 15, it can prevent the terminal male from shifting or loosening during insertion or extraction, thus ensuring that the electrical connection between the antenna and the connection device is stable and reliable. The main function of the first feed-in ground piece 17 is for feeding and grounding. One end of the first feed-in ground piece 17 is connected to the terminal female limit post 15 through the second transition section 16. Through the design of the first feed-in ground piece 17, the feeding and grounding processing of electromagnetic wave signals can be realized, thereby ensuring the normal operation of the antenna.

[0071] Preferably, as Figure 1-4As shown, the terminal 2 includes: a third transition section 18, a male terminal retaining ring 19, a fourth transition section 20, and a second feed-in ground part 21. The other end of the first feed-in ground part 17 is connected to one end of the male terminal retaining ring 19 through the third transition section 18, and the other end of the male terminal retaining ring 19 is connected to the second feed-in ground part 21 through the fourth transition section 20. The third transition section 18, as the connection part between the first feed-in ground part 17 and the male terminal retaining ring 19, ensures the stability and reliability of the electrical connection between the two. The third transition section 18 is responsible for transmitting the electromagnetic wave signal received from the first feed-in ground part 17 and transferring it to the male terminal retaining ring 19. Due to possible differences in impedance, size, etc. between different components, the third transition section 18 also plays a role in transition and matching. Through its carefully designed structure and size, it achieves a smooth transition from the first feed-in ground part 17 to the male terminal retaining ring 19, thereby reducing signal reflection and loss during transmission.

[0072] The male terminal retaining ring 19 includes: an upper groove of the male terminal retaining ring and a lower edge of the male terminal retaining ring. The upper groove of the male terminal retaining ring is connected to the lower edge of the male terminal retaining ring. The male terminal retaining ring 19 is a fastener used to fix and connect different components. One end of the male terminal retaining ring 19 is connected to the first feed-in ground part 17 through the third transition section 18, and the other end of the male terminal retaining ring 19 is connected to the second feed-in ground part 21 through the fourth transition section 20. This connection design ensures the stability and reliability of the entire terminal structure. The male terminal retaining ring 19 usually has the characteristics of quick installation and disassembly, which makes it very convenient during antenna installation and maintenance. Operators can easily snap the male terminal retaining ring 19 in or out, thus achieving quick connection or disconnection of the antenna.

[0073] The fourth transition section 20 continues the electrical connection function of the third transition section 18, transferring the signal on the male terminal retaining ring 19 to the second feed-in ground part 21. It ensures the continuity and stability of the signal during transmission. Similar to the third transition section 18, the fourth transition section 20 achieves a smooth transition from the male terminal retaining ring 19 to the second feed-in ground part 21, thereby reducing signal reflection and loss during transmission.

[0074] The second feed-in ground part 21, as the continuation of power feeding and grounding, continues the function of the first feed-in ground part 17. It is responsible for transferring the electromagnetic wave signal from the terminal to other parts of the antenna and ensuring the grounding treatment of the antenna. The second feed-in ground part 21 can further optimize the performance of the antenna. For example, its impedance matching characteristics can be adjusted to reduce signal reflection and loss during transmission; or its frequency response characteristics can be adjusted to meet the performance requirements within a specific frequency band.

[0075] As Figure 5As shown in the figure, the present invention further provides a microwave oven, comprising: the planar antenna 23 as described in any one of the above, at least two of the planar antennas 23 are provided, and the planar antennas 23 are mounted on the top of the microwave oven body 22 through a radiation body locking and positioning assembly. A coupling connection is formed between the planar antenna 23 and an end face of the microwave oven body 22 to generate a downward-radiating electric field. By adjusting the phase difference between the two planar antennas 23, the control of the beam direction, beam shape, and beam width can be achieved.

[0076] Preferably, it includes:

[0077] A phase adjuster for adjusting the phase difference between the planar antennas 23;

[0078] A temperature probe for collecting the temperature data inside the microwave oven body 22 in real time;

[0079] A controller, the temperature probe is electrically connected to the phase adjuster through the controller. The controller is used to control the phase adjuster to adjust the phase difference between the planar antennas 23 according to the received temperature data inside the microwave oven body 22, so as to achieve the optimal heating at different frequencies and different spatial points inside the microwave oven body 22;

[0080] The planar antenna 23 includes: a first planar antenna 24 and a second planar antenna 25;

[0081] By adjusting the phase difference between the first planar antenna 24 and the second planar antenna 25, the control of the beam direction and shape can be achieved; this technology is called phased array technology. Utilizing the interference and superposition effects of waves, the signal can be focused in a specific direction, thereby improving the heating effect and reliability in a certain area inside the microwave oven, and thus enabling the uniform heating of different food materials inside the microwave oven; the change of the phase not only affects the beam direction but also can change the beam width; by adjusting the phase difference between the first planar antenna 24 and the second planar antenna 25, the beam narrowing or widening can be achieved to adapt to the heating of foods with different positions and volumes inside the microwave oven;

[0082] The temperature probe is used to collect the temperature data inside the microwave oven body 22 in real time. The controller is used to control the phase adjuster to adjust and change the phase difference between the first planar antenna 24 and the second planar antenna 25 according to the received temperature data inside the microwave oven body, weakening the heating effect at the high-temperature points of the food in real time and enhancing the heating effect at the low-temperature points, so as to achieve uniform heating; in addition, by changing the phase difference between the first planar antenna 24 and the second planar antenna 25, weakening the heating effect in a certain area of the food in real time and enhancing the heating effect in another area, so as to achieve the differential control of the temperature at each point inside the microwave oven.

[0083] AsFigure 6 As shown in the figure, the frequency return loss and efficiency diagram of the first planar antenna 24 in a microwave oven provided by the present invention. The first planar antenna 24 can maintain stable performance within a wider frequency range, optimize the antenna frequency and S parameters of the antenna, thereby improving the return loss and efficiency of the antenna, and improving the performance of microwave heating technology. The parameters of the first planar antenna 24 are shown in Table 1 below:

[0084] Table 1 Parameters of the first planar antenna

[0085]

[0086] From Table 1, we can see that the radiation ability, operating frequency range, and energy conversion efficiency of the first planar antenna 24 are excellent.

[0087] As Figure 7 shown in the figure, the frequency return loss and efficiency diagram of the second planar antenna 25 in a microwave oven provided by the present invention. The second planar antenna 25 can maintain stable performance within a wider frequency range, optimize the antenna frequency and S parameters of the antenna, thereby improving the return loss and efficiency of the antenna, and improving the performance of microwave heating technology. The parameters of the second planar antenna 25 are shown in Table 2 below:

[0088]

[0089]

[0090] From Table 2, we can see that the radiation ability, operating frequency range, and energy conversion efficiency of the second planar antenna 25 are excellent.

[0091] As Figure 8 shown in the figure, the heating effect diagram of placing 5 identical food ingredients in different areas in the microwave oven provided by the present invention. Control the input power, heating frequency point, and heating time. For 5 identical food ingredients, with the position unchanged, change the phase difference of the input power of the first planar antenna 24 and the second planar antenna 25. The temperatures of the 5 food ingredients (numbered ① - ⑤) are shown in Table 3 below.

[0092] Table 3 Heating data of placing 5 identical food ingredients in different areas in the microwave oven

[0093]

[0094] From Table 3, we find that by adjusting and changing the phase difference between the first planar antenna 24 and the second planar antenna 25, the heating effects of the 5 food ingredients in different areas inside the microwave oven body 22 are different, realizing differential control of the temperatures at each point inside the microwave oven body 22.

[0095] It can be understood that the present invention is described by means of some embodiments. Those skilled in the art will know that, without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all changes or equivalent substitutions that fall within the scope of the claims of this application. Additionally, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A planar antenna, characterized in that: include: A radiation body, the radiation body is used to generate directional electromagnetic waves, the radiation body is provided with a plurality of long sides and a plurality of cut-angle sides, the plurality of long sides jointly control the antenna frequency and S parameters, and each of the cut-angle sides controls the antenna S parameters; The terminal is connected to the radiation body and is fed to the radiation body by the terminal to form a single-stage flat-plate antenna.

2. The planar antenna according to claim 1, characterized in that: There are at least four long sides, wherein: The first long side and a part of the second long side, the third long side and the fourth long side jointly control the frequency and S parameters of the antenna; The second long side and a portion of the first long side, the third long side and the fourth long side jointly control the frequency and S parameters of the antenna; The third long side and a portion of the first long side, the second long side and the fourth long side jointly control the frequency and S parameters of the antenna; The fourth long side, the first long side, the second long side and a part of the third long side jointly control the frequency and S parameter of the antenna; There are at least two chamfered edges, and the chamfered edges are arranged correspondingly.

3. The planar antenna according to claim 1, characterized in that: The terminal comprises: a radiation body locking and positioning assembly, and the radiation body locking and positioning assembly comprises: a radiation body positioning piece and a locking piece, one end of the radiation body positioning piece passes through the radiation body and the radiation body positioning piece is connected to the radiation body through the locking piece.

4. The planar antenna according to claim 3, characterized in that: The radiation body locking and positioning assembly includes: an anti-slip gasket and a supporting platform. One end face of the radiation body positioning piece is externally arranged on the locking piece to form a radiation body positioning plane. The anti-slip gasket is arranged between one end face of the radiation body and the locking piece. The other end of the radiation body positioning piece is connected to one end face of the supporting platform.

5. The planar antenna according to claim 4, characterized in that: The terminal comprises: a first transition section and an inner conductor rod of the antenna, and the other end surface of the support platform is connected to one end of the inner conductor rod of the antenna through the first transition section.

6. The planar antenna according to claim 5, characterized in that: The terminal includes: a positioning and fixing component, which includes: a fixed stopper and a terminal male fastener, the other end of the inner conductor rod of the antenna is connected to one end of the fixed stopper, the other end of the fixed stopper is connected to one end of the terminal male fastener, a fastener is provided on the outer circumference of the terminal male fastener close to one end of the fixed stopper, and a terminal male positioning plane is provided on the outer side wall of the terminal male fastener.

7. The planar antenna according to claim 6, characterized in that: The terminal comprises: a terminal female limiting column and a first feeding ground component, the other end of the terminal male fastener is connected to one end of the terminal female limiting column, and the other end of the terminal female limiting column is connected to one end of the first feeding ground component through a second transition section.

8. The planar antenna according to claim 7, characterized in that: The terminal includes: a third transition section, a terminal male clamp, a fourth transition section, and a second feeding ground piece. The other end of the first feeding ground piece is connected to one end of the terminal male clamp through the third transition section, and the other end of the terminal male clamp is connected to the second feeding ground piece through the fourth transition section.

9. A microwave oven, characterized in that: include: According to any one of claims 1 to 8, at least two planar antennas are provided, and the planar antennas are installed on the top of the microwave oven body through a radiation body locking and positioning assembly, and a coupling connection is formed between the planar antenna and an end surface of the microwave oven body to generate a downward radiating electric field, and the beam direction, beam shape and beam width are controlled by adjusting the phase difference between the planar antennas.

10. The microwave oven according to claim 9, characterized in that include: A phase adjuster, used for adjusting the phase difference between the planar antennas; A temperature probe, used for collecting temperature data inside the microwave oven body in real time; A controller, wherein the temperature probe is electrically connected to the phase adjuster through the controller, and the controller is used to control the phase adjuster to adjust the phase difference between the planar antennas according to the temperature data received from the inside of the microwave oven body, so as to achieve advantageous heating at different frequencies and different spatial points inside the microwave oven body.

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