Indoor beautification antenna

Abstract

The embodiment of the present application provides an indoor beautification antenna, which belongs to the technical field of communication antennas, and includes a dielectric substrate, one side of which is provided with a stratum substrate; a patch substrate is provided on the side of the dielectric substrate away from the stratum substrate, and the circumferential edge of the patch substrate is constructed with an array of openings, and the opening group runs through the dielectric substrate and the stratum substrate; a main slot is provided in the patch substrate, and the main slot is arranged in a closed ring shape, and any two opposite sides of the main slot are respectively constructed with a guide slot, and the guide slot extends to the opening group, and the guide slot, the main slot and the opening group jointly separate the patch substrate to form two resonance regions; wherein the main slot forms a central patch resonant cavity, and each resonance region forms a substrate integrated waveguide resonant cavity. The indoor beautification antenna provided by the present application integrates a central patch resonant cavity and a substrate integrated waveguide resonant cavity in a frequency band, which is conducive to realizing multi-resonance point operation under a low-profile size design.

Description

Technical Field

[0001] The present application relates to the technical field of communication antennas, and in particular to an indoor beautification antenna. Background Art

[0002] As a kind of beautification antenna, the Chinese character antenna is mainly derived from the innovative exploration of the shape and structure of the antenna, making its shape similar to Chinese characters so that it can be used in public areas such as murals.

[0003] In the related art, a beautified antenna is generally formed by setting a metal sheet on a dielectric plate by carving, and the feeding probe of the beautified antenna is generally constructed in a bent "L" shape, thereby reducing the cost and facilitating impedance matching with the patch antenna.

[0004] However, due to the bending design of the feeding probe, the beautification antenna is overly dependent on the feeding network and high profile. The profile height needs to be greater than 0.11λo (λo is the wavelength in free space) to ensure a wider working bandwidth. The high-profile structure will cause the overall thickness of the antenna to increase. The thick beautification antenna is difficult to adapt to external assembly workpieces, and the beautification antenna in related technologies generally does not have filtering characteristics, resulting in poor adaptability of the antenna, which is not conducive to widespread promotion and use. Summary of the invention

[0005] The embodiment of the present application provides an indoor beautification antenna, which is used to solve the technical problems in the related art that the beautification antenna is difficult to take into account both low profile and wide bandwidth and lacks filtering characteristics.

[0006] The present application provides an indoor beautification antenna, comprising:

[0007] A dielectric substrate, wherein a stratum substrate is provided on one side of the dielectric substrate;

[0008] A patch substrate is arranged on a side of the dielectric substrate away from the stratum substrate, and a peripheral edge of the patch substrate is configured with an array of openings, and the openings penetrate the dielectric substrate and the stratum substrate;

[0009] A main slot is provided in the patch substrate, the main slot is annularly closed, any two opposite sides of the main slot are respectively configured with a guide slot, the guide slot extends to the opening group, and the guide slot, the main slot and the opening group jointly separate the patch substrate to form two resonance areas;

[0010] A central patch resonant cavity is formed inside the main slot, and each of the resonant regions forms a substrate integrated waveguide resonant cavity.

[0011] In a possible implementation, it further includes:

[0012] A feeding port group is arranged in the main slot to transmit an excitation signal to the central patch resonant cavity.

[0013] In a possible implementation, the feeding port group includes two separated coaxial feeding ports, the two coaxial feeding ports are symmetrically arranged with respect to the axis where the guide slot is located, and the two coaxial feeding ports are differential feeding ports.

[0014] In a possible implementation manner, the main slot is a rectangular slot, and the guide slot is located on a midline of the main slot.

[0015] In a possible implementation manner, a coaxial adjustment slot is provided at one end of at least one of the guide slots close to the main slot, and the adjustment slot enters the main slot to adjust the resonant frequency of the central patch resonant cavity.

[0016] In a possible implementation manner, each of the guide grooves is provided with an adjustment groove, both of the adjustment grooves are rectangular grooves, and the length of the adjustment groove is negatively correlated with the resonant frequency of the central patch resonant cavity.

[0017] In a possible implementation manner, an orthographic projection of the patch substrate on the dielectric substrate falls into the dielectric substrate.

[0018] In a possible implementation, the excitation mode of the substrate integrated waveguide resonant cavity is a transverse electric wave excitation mode, and the excitation mode of the central patch resonant cavity is a transverse magnetic wave excitation mode.

[0019] In a possible implementation manner, the patch substrate is circular in shape, and the opening group is a metallized through hole arranged in an array around the edge of the patch substrate.

[0020] In a possible implementation manner, the dielectric constant of the dielectric substrate is 2.2, the loss tangent value is 0.001, and the thickness is 1.5 mm.

[0021] The indoor beautification antenna provided by the present application is configured by arranging the main slot in a closed ring shape, and a guide slot is respectively constructed on any opposite sides of the main slot, and the guide slot extends to the opening group. The guide slot, the main slot and the opening group jointly separate the patch substrate into two resonance regions, the main slot forms a central patch resonant cavity, and each of the resonant regions forms a substrate integrated waveguide resonant cavity.

[0022] Therefore, the central patch resonant cavity and the substrate integrated waveguide resonant cavity respectively form an in-band resonance point. By designing one frequency band, two in-band resonance points can exist, thereby realizing wide-band filtering characteristics. In addition, since the central patch resonant cavity and the substrate integrated waveguide resonant cavity are formed separately, multi-mode resonance can be realized, the impedance matching of the antenna is improved, and the bandwidth of the antenna is expanded. In addition, the above-mentioned multi-mode resonance design can be completed through a dielectric substrate without designing a multi-layer module. The antenna work can be completed under a low-profile and small-size structure, which is conducive to being widely used in various different assembly and usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 This is a three-dimensional schematic diagram of an indoor beautification antenna in an embodiment of the present application;

[0025] Figure 2 for Figure 1 Side view of

[0026] Figure 3 This is a reflection coefficient diagram of the indoor beautification antenna in the embodiment of the present application;

[0027] Figure 4 It is the actual gain diagram of the indoor beautification antenna in the embodiment of the present application;

[0028] Figure 5 : is the radiation pattern of the indoor beautification antenna at the center frequency in the embodiment of the present application.

[0029] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0030] Description of Reference Numerals

[0031] 100-chip substrate; 200-dielectric substrate; 300-stratum substrate; 400-coaxial feeding port;

[0032] 101-main slot; 102-guide slot; 103-adjustment slot; 104-opening group;

[0033] 105-substrate integrated waveguide resonant cavity; 106-center patch resonant cavity. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0036] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0037] As mentioned in the background technology, the beautification antenna in the related technology is generally made into the shape of Chinese characters, which makes it more in line with the preferences of the public or the environmental requirements, bringing better user experience and acceptance. The Chinese character antenna is a branch of the beautification antenna. The Chinese character antenna retains the characteristics of Chinese characters to the greatest extent, but the antenna performance and various indicators are difficult to meet the requirements, and the theoretical analysis of the antenna is even more difficult.

[0038] In the related art, the Chinese character beautification antenna mainly adopts the method of setting the metal sheet on the dielectric layer plate on the copper layer of the dielectric plate or on the aluminum plate of the dielectric plate by engraving, which retains the specific geometric structure of the Chinese characters and has the advantages of small size, simplicity and low cost.

[0039] The feed probe of the above-mentioned Chinese character beautification antenna adopts an "L"-shaped bend. The original intention of this setting is to reduce costs while facilitating impedance matching with the patch antenna, thereby achieving a wider working bandwidth. However, the "L"-shaped feed probe increases the profile height of the beautification antenna to a certain extent, and is not conducive to filtering the antenna signal. It has great practical limitations and is not conducive to widespread promotion and use. Therefore, the Chinese character beautification antenna in the related art cannot take into account good radiation characteristics and filtering characteristics. At the same time, it is difficult to achieve a broadband working frequency band under the premise of low profile size.

[0040] Based on the above related technical description, one or more embodiments of the present application provide an indoor beautification antenna, which utilizes a central patch resonant cavity and a substrate integrated waveguide resonant cavity to respectively form an in-band resonance point. By designing one frequency band, two in-band resonance points can exist, thereby realizing wide-band filtering characteristics. In addition, since the central patch resonant cavity and the substrate integrated waveguide resonant cavity are formed separately, multi-mode resonance can be realized, the impedance matching of the antenna is improved, and the bandwidth of the antenna is expanded. In addition, the above-mentioned multi-mode resonance design can be completed through a dielectric substrate, without the need to design a multi-layer module, and the antenna operation can be completed under a low-profile and small-size structure, which is conducive to being widely used in various different assembly and usage scenarios.

[0041] The indoor beautification antenna in the embodiment of the present application is described below with reference to the accompanying drawings.

[0042] like Figure 1 and Figure 2 As shown, the indoor beautification antenna of the embodiment of the present application includes a dielectric substrate 200, a patch substrate 100 and a main slot 101. A stratum substrate 300 is provided on one side of the dielectric substrate 200; the patch substrate 100 is provided on the side of the dielectric substrate 200 away from the stratum substrate 300, and the circumferential edge of the patch substrate 100 is configured with an array of opening groups 104, and the opening group 104 penetrates the dielectric substrate 200 and the stratum substrate 300; the main slot 101 is provided in the patch substrate 100, and the main slot 101 is arranged in a closed annular shape, and a guide slot 102 is respectively configured on any opposite sides of the main slot 101, and the guide slot 102 extends to the opening group 104, and the guide slot 102, the main slot 101 and the opening group 104 jointly separate the patch substrate 100 to form two resonance regions; wherein, a central patch resonant cavity 106 is formed in the main slot 101, and each resonance region forms a substrate integrated waveguide resonant cavity 105.

[0043] It can be seen from the above description that the indoor beautification antenna of the embodiment of the present application, by constructing an opening group 104 on the circumferential edge of the patch substrate 100, the opening group 104 can prevent electromagnetic waves from leaking at the edge of the antenna, thereby reducing the edge effect and improving the radiation efficiency.

[0044] Since the main slot 101 is a closed ring slot, the area enclosed by the main slot 101 forms a central patch resonant cavity 106. At the same time, the resonant area separated by the guide slot 102, the main slot 101 and the opening group 104 can form a substrate integrated waveguide resonant cavity 105 by gap coupling. Therefore, two in-band resonance points can be integrated through one frequency band to achieve multi-mode operation and wide-band filtering characteristics.

[0045] In addition, the multi-mode resonance design can be completed through a dielectric substrate 200, without the need to design a multi-layer module, and the feeding probe does not need to be bent. The antenna can be operated in a low-profile and small-size structure, which is conducive to wide application in various assembly and usage scenarios.

[0046] It should be noted that the formation substrate 300 and the patch substrate 100 mentioned in the embodiment of the present application can be made of metal materials, for example, copper, silver, aluminum, nickel, tin metal materials or alloy materials, and suitable materials can be selected according to specific application requirements and performance requirements.

[0047] The dielectric substrate 200 can adopt the antenna dielectric plate material in the related technology, for example, polytetrafluoroethylene composite material (F4B), Rogers RO4003C, Rogers RO4350B, etc. When the dielectric substrate 200 adopts different plates, the size parameters of the indoor beautification antenna also need to be readjusted as long as the corresponding working frequency band and bandwidth requirements are met.

[0048] Exemplarily, the dielectric constant of the dielectric substrate 200 is 2.2, the loss tangent value is 0.001, and the thickness is 1.5.

[0049] The indoor beautification antenna in the embodiment of the present application may be a broadband antenna, a multi-band antenna or a phased array antenna, and there is no absolute limitation on this.

[0050] by Figure 1 Taking the indoor beautification antenna shown as an example, the patch substrate 100 is located on the upper layer of the dielectric substrate 200, and the stratum substrate 300 is located on the lower layer of the dielectric substrate 200. The patch substrate 100 serves as a radiation sheet, responsible for transmitting and receiving electromagnetic waves, and the stratum substrate 300 serves as a ground plane to provide a reference potential, which helps to form a closed electromagnetic field, reduce edge effects, and achieve impedance matching and electromagnetic shielding.

[0051] In some embodiments, the dielectric substrate 200 and the stratum substrate 300 are rectangular in shape, the patch substrate 100 is circular in shape, and the opening group 104 is a metallized through hole arrayed around the edge of the patch substrate 100 .

[0052] The dielectric substrate 200, the patch substrate 100 and the stratum substrate 300 are connected through metallized through holes. Specifically, the metallized through holes are evenly arrayed on the dielectric substrate 200 and penetrate the stratum substrate 300 and the patch substrate 100. A plurality of metallized through holes extend along the circumference of the patch substrate 100 and are formed into a circular ring shape. Here, the metallized through holes also play a role of coupling with the slots as gaps, so as to form a substrate integrated waveguide resonant cavity 105 on the patch substrate 100.

[0053] As an alternative implementation, the shape of the patch substrate 100 is a regular polygon, or the shape of the patch substrate 100 is a rectangle, which is not absolutely limited in the embodiments of the present application.

[0054] like Figure 1 As shown, in the embodiment of the present application, the indoor beautification antenna further includes a feeding port group, which is arranged in the main slot 101 to transmit an excitation signal to the central patch resonant cavity 106 .

[0055] The above-mentioned excitation signal is generally a radio frequency signal. The feeding port group includes two separated coaxial feeding ports 400 , the two coaxial feeding ports 400 are symmetrically arranged relative to the axis where the guide slot 102 is located, and the two coaxial feeding ports 400 are differential feeding ports.

[0056] Here, the coaxial feed port 400 refers to transmitting the RF signal to the patch substrate 100 of the indoor beautification antenna through the coaxial cable. Generally, the coaxial feed port 400 is used to connect the coaxial cable. The coaxial cable consists of a center conductor, an insulating medium and an external shielding layer. The center conductor of the coaxial cable passes through the coaxial feed port 400 and is connected to the patch substrate 100. The external shielding layer of the coaxial cable is connected to the formation substrate 300. The RF signal is transmitted to the patch substrate 100 of the indoor beautification antenna through the coaxial cable, thereby exciting the resonant mode of the indoor beautification antenna.

[0057] by Figure 1 Take the direction shown as an example. Figure 1 In the main slot 101, a first coaxial feeding port and a second coaxial feeding port are respectively arranged, the first coaxial feeding port is located at the left part of the main slot 101, and the second coaxial feeding port is located at the right part of the main slot 101. The first coaxial feeding port and the second coaxial feeding port are symmetrically arranged in the main slot 101 and have the same distance from the guide slot 102. Thus, it can ensure that the indoor beautification antenna achieves uniform electromagnetic field distribution and consistent radiation characteristics. At the same time, the two symmetrically arranged coaxial feeding ports 400 can more effectively excite the resonant mode of the antenna, reduce energy loss, and improve the radiation efficiency of the antenna.

[0058] Furthermore, the two coaxial feeding ports 400 are differential feeding ports, that is, the two coaxial feeding ports 400 are respectively fed with equal amplitude and opposite phase RF signals. The differential feeding method can realize linear polarization radiation, and the common mode components of the differential signal are offset, which is beneficial to improve the signal-to-noise ratio and anti-interference ability of the indoor beautification antenna.

[0059] like Figure 1 and Figure 4As shown, it should be noted that since both the first coaxial feeding port and the second coaxial feeding port are located inside the main slot 101, for the central patch resonator cavity 106 formed by the main slot 101, the first coaxial feeding port and the second coaxial feeding port are located at the central position of the central patch resonator cavity 106, and the central patch resonator cavity 106 can directly radiate. Therefore, when a high-frequency signal is fed in, the indoor beautifying antenna will generate out-of-band radiation null points, that is Figure 4 Point C in

[0060] Figure 4 When the frequency of the fed high-frequency signal is between the high-frequency bands of 3.5 GHz - 3.6 GHz, the gain that the indoor beautifying antenna can achieve is lower than -32 dBi (antenna gain refers to the ratio of the power density of the signal generated by the actual antenna and the ideal radiation unit at the same point in space under the condition of equal input power). The out-of-band radiation null points can effectively suppress out-of-band interference signals, enabling the indoor beautifying antenna to achieve filtering characteristics on the basis of radiation, improving the anti-interference ability of the system, and being beneficial for adapting to complex application scenarios.

[0061] As Figure 1 shown, in some embodiments, the main slot 101 is a rectangular slot, and the guiding slot 102 is located on the midline of the main slot 101.

[0062] The main slot 101 itself is an annular closed slot body. The rectangular annular slot body design of the main slot 101 is convenient for adapting to the Chinese character shape 'zhong', making it easy to be applied to different installation environments. As an alternative implementation, the shape of the main slot 101 can also be a closed annular circle, ellipse or other shapes. The embodiments of the present application do not make an absolute limitation on this.

[0063] It can also be seen from Figure 1 that one end of the guiding slot 102 is connected to the main slot 101, and the other end extends to the opening group 104. Through the guiding slot 102, long-slot radiation is realized, constituting the substrate integrated waveguide resonator cavity 105.

[0064] The guiding slot 102 is located on the midline of the main slot 101. Both guiding slots 102 extend along the radial direction of the patch substrate 100, and the straight lines where the two guiding slots 102 are located coincide. The patch substrate 100 is evenly divided into two resonant regions of the same size through the opening group 104, the guiding slot 102 and the main slot 101. The two resonant regions are symmetrically arranged with respect to the guiding slot 102, which is beneficial for the two substrate integrated waveguide resonator cavities 105 to form a symmetric electromagnetic field distribution and realize a specific resonant mode.

[0065] In some embodiments, a coaxial adjustment slot 103 is provided at one end of at least one guide slot 102 close to the main slot 101 , and the adjustment slot 103 enters the main slot 101 to adjust the resonance frequency of the central patch resonant cavity 106 .

[0066] Each guide slot 102 is provided with an adjustment slot 103 . Both adjustment slots 103 are rectangular slots. The length of the adjustment slot 103 is negatively correlated with the resonance frequency of the central patch resonant cavity 106 .

[0067] Since the adjustment slot 103 extends into the main slot 101, a new electromagnetic field boundary will be formed in the resonant cavity, and the newly generated electromagnetic field will affect the propagation path and standing wave mode of the electromagnetic wave, thereby changing the original resonant frequency. Exemplarily, the longer the adjustment slot 103 extends into the main slot 101, the lower the resonant frequency of the center patch resonant cavity 106, and the shorter the adjustment slot 103 extends into the main slot 101, the higher the resonant frequency of the center patch resonant cavity 106. Therefore, the resonant frequency of the center patch resonant cavity 106 can be disturbed by changing the length of the adjustment slot 103.

[0068] The length adjustment of the adjustment slot 103 can be achieved by laser engraving or tool cutting. For indoor beautification antennas with different required resonant frequencies, the length of the adjustment slot 103 with corresponding parameters is designed.

[0069] By providing an adjustment slot 103 at the end of each guide slot 102, the accuracy of adjusting the resonant frequency can be improved, which facilitates the indoor beautification antenna to achieve multi-band operation. In addition, the length of each adjustment slot 103 can be the same or different.

[0070] In some embodiments, the excitation mode of the substrate integrated waveguide resonant cavity 105 is a transverse electric wave excitation mode, and the excitation mode of the center patch resonant cavity 106 is a transverse magnetic wave excitation mode.

[0071] like Figure 3 As shown, further, in the resonance region separated by the guide groove 102, the excitation modes of the two substrate integrated waveguide resonant cavities 105 are both TE101 mode, Figure 3 Point A in the figure represents the in-band resonance point corresponding to the TE101 mode. The excitation mode of the central patch resonant cavity 106 is the TM10 mode. Figure 3 Point B in FIG. 1 represents the in-band resonance point corresponding to the TM10 mode. Thus, two in-band resonance points are combined in one indoor landscaping antenna to achieve wideband filtering operation.

[0072] like Figure 1 and Figure 2 As shown, in some embodiments, the orthographic projection of the patch substrate 100 on the dielectric substrate 200 falls into the dielectric substrate 200 .

[0073] Specifically, the size of the patch substrate 100 is smaller than the dielectric substrate 200, and the size of the stratum substrate 300 and the dielectric substrate 200 is roughly the same. The smaller-sized patch substrate 100 can make the electromagnetic field more concentrated, reduce the leakage of electromagnetic waves at the edge, and improve the radiation efficiency of the indoor beautification antenna. In addition, the smaller-sized patch substrate 100 can more easily achieve impedance matching, reduce signal reflection and loss, and achieve wider bandwidth matching. Therefore, by adjusting the size parameters of the patch substrate 100, the impedance characteristics of the indoor beautification antenna can be more accurately controlled.

[0074] like Figure 5 As shown, the figure shows the radiation pattern simulated at the center frequency of the indoor beautification antenna in the embodiment of the present application, wherein: Figure 5 The left picture in the middle is the E-plane radiation pattern of the indoor beautification antenna, and the right picture is the H-plane radiation pattern of the indoor beautification antenna.

[0075] The E plane refers to the plane containing the maximum radiation direction and the electric field vector, that is, the plane formed by the electric field intensity direction and the maximum radiation direction. The H plane refers to the plane containing the maximum radiation direction and the magnetic field vector, that is, the plane formed by the magnetic field direction and the maximum radiation direction.

[0076] Depend on Figure 5 It can be seen that the indoor beautification antenna achieves high cross-polarization suppression in the maximum radiation direction.

[0077] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0078] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. An indoor beautification antenna, characterized in that: include: A dielectric substrate (200), wherein a stratum substrate (300) is provided on one side of the dielectric substrate (200); A patch substrate (100) is arranged on a side of the dielectric substrate (200) away from the stratum substrate (300), and a peripheral edge of the patch substrate (100) is provided with an array of opening groups (104), and the opening groups (104) penetrate the dielectric substrate (200) and the stratum substrate (300); wherein the stratum substrate (300) and the patch substrate (100) are both made of metal materials; A main slot (101) is provided in the patch substrate (100), the main slot (101) is arranged in a closed annular shape, and a guide slot (102) is respectively constructed on any two opposite sides of the main slot (101), the guide slot (102) extends to the hole group (104), and the guide slot (102), the main slot (101) and the hole group (104) together separate the patch substrate (100) to form two resonance areas; A central patch resonant cavity (106) is formed inside the main slot (101), and each of the resonant regions forms a substrate integrated waveguide resonant cavity (105).

2. The indoor beautification antenna according to claim 1, characterized in that: Also includes: A feeding port group is provided in the main slot (101) to transmit an excitation signal to the central patch resonant cavity (106).

3. The indoor beautification antenna according to claim 2, characterized in that: The feeding port group comprises two separated coaxial feeding ports (400), the two coaxial feeding ports (400) are symmetrically arranged relative to the axis where the guide slot (102) is located, and the two coaxial feeding ports (400) are differential feeding ports.

4. The indoor beautification antenna according to claim 2, characterized in that: The main slot (101) is a rectangular slot, and the guide slot (102) is located on the midline of the main slot (101).

5. The indoor beautification antenna according to any one of claims 1 to 4, characterized in that: At least one of the guide slots (102) is provided with a coaxial adjustment slot (103) at one end close to the main slot (101); the adjustment slot (103) enters the main slot (101) to adjust the resonance frequency of the central patch resonant cavity (106).

6. The indoor beautification antenna according to claim 5, characterized in that: Each of the guide grooves (102) is provided with an adjustment groove (103), both adjustment grooves (103) are rectangular grooves, and the length of the adjustment groove (103) is negatively correlated with the resonance frequency of the central patch resonant cavity (106).

7. The indoor beautification antenna according to any one of claims 1 to 4, characterized in that: The orthographic projection of the patch substrate (100) on the dielectric substrate (200) falls into the dielectric substrate (200).

8. The indoor beautification antenna according to any one of claims 1 to 4, characterized in that: The excitation mode of the substrate integrated waveguide resonant cavity (105) is a transverse electric wave excitation mode, and the excitation mode of the central patch resonant cavity (106) is a transverse magnetic wave excitation mode.

9. The indoor beautification antenna according to any one of claims 1 to 4, characterized in that: The patch substrate (100) is circular in shape, and the opening group (104) is a metallized through hole arrayed around the edge of the patch substrate (100).

10. The indoor beautification antenna according to any one of claims 1 to 4, characterized in that: The dielectric substrate (200) has a dielectric constant of 2.2, a loss tangent value of 0.001, and a thickness of 1.5 mm.

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