Multi-band patch antenna and alarm device

Abstract

This application provides a multi-band patch antenna and an alarm device. The multi-band patch antenna includes an evaluation board and a patch antenna disposed in the clearance area of ​​the evaluation board. The patch antenna includes at least a patch antenna radiator. The evaluation board includes at least an evaluation board radiator. The multi-band patch antenna generates self-resonance through the patch antenna radiator and generates resonance through coupling between the patch antenna radiator and the evaluation board radiator, thereby obtaining resonance in multiple frequency bands. This allows the multi-band patch antenna to operate in multiple target frequency bands, reducing the size of the multi-band patch antenna and widening its coverage bandwidth.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more specifically, to a multi-band patch antenna and an alarm device. Background Technology

[0002] Based on the antenna system in the alarm, alarm functions can be realized in fields such as system failure, security, transportation, medical rescue, emergency disaster relief, and sensor detection.

[0003] Currently, to meet the application needs of different alarms in various scenarios, antennas are often integrated inside the alarm unit, which places high demands on antenna performance and reliability. Antenna size is limited by the size of the alarm unit and the available installation space, resulting in antenna performance being significantly affected by size.

[0004] Therefore, the antenna design for alarm devices in the existing technology has certain limitations. Utility Model Content

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a multi-band patch antenna and alarm device, thereby solving the practical problem of the limitations in antenna design for alarm devices in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a multi-band patch antenna, including: an evaluation board and a patch antenna disposed in the clearance area of ​​the evaluation board; the patch antenna includes at least: a patch antenna radiator; the evaluation board includes at least: an evaluation board radiator;

[0008] The multi-band patch antenna generates self-resonance through the patch antenna radiator and resonance through coupling between the patch antenna radiator and the evaluation board radiator, thereby obtaining resonance in multiple frequency bands, so that the multi-band patch antenna can operate in multiple target frequency bands.

[0009] As an optional implementation, the patch antenna radiator generates self-resonance in a first frequency band or a second frequency band, so that the multi-band patch antenna operates in a first target frequency band or a second target frequency band.

[0010] As an optional implementation, the evaluation plate radiator includes: a first evaluation plate radiator;

[0011] The first evaluation board radiator is coupled with the patch antenna radiator to generate resonance in the third frequency band, so that the multi-band patch antenna operates in the third target frequency band.

[0012] As an optional implementation, the evaluation plate radiator further includes: a second evaluation plate radiator;

[0013] The second evaluation board radiator is coupled with the patch antenna radiator to generate resonance in the fourth frequency band, so that the multi-band patch antenna operates in the fourth target frequency band.

[0014] As an optional implementation, the first evaluation board radiator is coupled with the second evaluation board radiator to generate resonance in the fifth frequency band, so that the multi-band patch antenna operates in the fifth target frequency band.

[0015] As an optional implementation, the first target frequency band is 700MHz-960MHz;

[0016] The second target frequency band is 1700MHz-1900MHz;

[0017] The third target frequency band is 1900MHz-2100MHz;

[0018] The fourth target frequency band is 2100MHz-2300MHz;

[0019] The fifth target frequency band is 2300MHz-2700MHz.

[0020] As an optional implementation, the evaluation board further includes: an evaluation board pad group; the patch antenna further includes: a patch antenna pad group;

[0021] The evaluation board pad group and the patch antenna pad group are soldered one-to-one using SMT process.

[0022] As an optional implementation, the evaluation board pad group includes: a first evaluation board pad, a second evaluation board pad, a third evaluation board pad, and a fourth evaluation board pad; the patch antenna pad group includes: a first patch antenna pad, a second patch antenna pad, a third patch antenna pad, and a fourth patch antenna pad.

[0023] The first evaluation board pads and the first patch antenna pads are soldered together using the SMT process.

[0024] The second evaluation board pads and the second patch antenna pads are soldered together using the SMT process.

[0025] The third evaluation board pads and the third patch antenna pads are soldered together using the SMT process.

[0026] The fourth evaluation board pad and the fourth patch antenna pad are soldered together using the SMT process.

[0027] As an optional implementation, the evaluation board also includes: patch antenna test points and an evaluation board ground layer;

[0028] The patch antenna test point is located between the radiator of the second evaluation board and the ground layer of the evaluation board, so as to test the voltage standing wave ratio and radiation efficiency of the patch antenna on the evaluation board through the patch antenna test point.

[0029] Secondly, embodiments of this application provide an alarm device, including: the multi-band patch antenna described in the first aspect above, wherein the multi-band patch antenna is integrated inside the alarm device.

[0030] The beneficial effects of this application are:

[0031] This application provides a multi-band patch antenna and an alarm device. The multi-band patch antenna includes an evaluation board and a patch antenna disposed in the clearance area of ​​the evaluation board. The multi-band patch antenna generates self-resonance through its patch antenna radiator and resonance through coupling between the patch antenna radiator and the evaluation board radiator. Because the patch antenna has only one radiator, its size is reduced, achieving miniaturization. The multi-band patch antenna generates resonance in multiple frequency bands based on self-resonance or coupling, enabling it to operate in multiple target frequency bands, covering low-frequency and mid-to-high-frequency bandwidths. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 1 ;

[0034] Figure 2 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 2 ;

[0035] Figure 3 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 3 ;

[0036] Figure 4 A schematic diagram of the voltage standing wave ratio (VSWR) of a multi-band patch antenna provided in an embodiment of this application;

[0037] Figure 5This is a schematic diagram illustrating the radiation efficiency of a multi-band patch antenna provided in an embodiment of this application.

[0038] Icons: Evaluation board: 1; Patch antenna: 2; Patch antenna radiator: 21; Evaluation board radiator: 11; First evaluation board radiator: 111; Second evaluation board radiator: 112; Evaluation board pad group: 12; Patch antenna pad group: 22; First evaluation board pad: 121; Second evaluation board pad: 122; Third evaluation board pad: 123; Fourth evaluation board pad: 124; First patch antenna pad: 221; Second patch antenna pad: 222; Third patch antenna pad: 223; Fourth patch antenna pad: 224; Patch antenna test point: 13; Evaluation board ground plane: 14. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Currently, there are high requirements for the performance and reliability of antennas integrated inside alarm devices. Antennas are often integrated inside the alarm device, and their size is limited by the size of the alarm device and the available installation space, resulting in antenna performance being significantly affected by size. In other words, existing antenna designs for alarm devices have certain limitations.

[0044] Based on the aforementioned problems, this application proposes a multi-band patch antenna, including an evaluation board and a patch antenna soldered to the clearance area of ​​the evaluation board. The patch antenna radiator on the patch antenna generates self-resonance and couples with the evaluation board radiator on the evaluation board to generate resonance, resulting in resonance across multiple frequency bands, thereby enabling the multi-band patch antenna to operate in multiple target frequency bands. This reduces the size of the multi-band patch antenna and widens its coverage bandwidth.

[0045] Figure 1 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 1 ,like Figure 1 As shown, the multi-band patch antenna includes an evaluation board 1 and a patch antenna 2 disposed in the clearance area of ​​the evaluation board 1. The patch antenna 2 includes at least a patch antenna radiator 21; the evaluation board 1 includes at least an evaluation board radiator 11.

[0046] Optionally, refer to Figure 1 The multi-band patch antenna includes an evaluation board 1 and a patch antenna 2. The patch antenna 2 is soldered onto the clearance area of ​​the evaluation board 1 using surface mount technology (SMT). SMT soldering reduces installation costs and facilitates integration. The patch antenna 2 includes at least a patch antenna radiator 21, and the evaluation board 1 includes at least an evaluation board radiator 11.

[0047] Because the patch antenna 2 has only one radiator, namely the patch antenna radiator 21, the size of the patch antenna 2 is reduced, achieving miniaturization of the patch antenna 2. Furthermore, the patch antenna 2 is made of all-metal material, which offers higher reliability than flexible printed circuit (FPC) boards and printed circuit boards (PCBs).

[0048] The multi-band patch antenna generates self-resonance through the patch antenna radiator 21 and resonance through the coupling between the patch antenna radiator 21 and the evaluation board radiator 11, thereby obtaining resonance in multiple frequency bands so that the multi-band patch antenna can operate in multiple target frequency bands.

[0049] Optionally, the patch antenna radiator 21 in the multi-band patch antenna can resonate on its own, that is, the patch antenna radiator 21 generates self-resonance, and the patch antenna radiator 21 can couple with the evaluation board radiator 11 on the evaluation board 1 to generate resonance. Multiple frequency bands are resonated based on the self-resonance method or the coupling method, so that the multi-band patch antenna can operate in multiple target frequency bands.

[0050] The multi-band patch antenna, through the self-resonance of the patch antenna radiator 21 and the mutual coupling between the patch antenna radiator 21 and the evaluation board radiator 11, can cover linearly polarized omnidirectional radiation waves of 700MHz-960MHz and 1700MHz-2700MHz. In other words, the operating frequency band of the multi-band patch antenna can cover a low-frequency bandwidth of 700MHz-960MHz and a high-frequency bandwidth of 1700MHz-2700MHz.

[0051] In this embodiment, the multi-band patch antenna includes an evaluation board and a patch antenna disposed in the clearance area of ​​the evaluation board. The multi-band patch antenna generates self-resonance through its patch antenna radiator and resonance through coupling between the patch antenna radiator and the evaluation board radiator. Because the patch antenna has only one radiator, its size is reduced, achieving miniaturization. The multi-band patch antenna generates resonance in multiple frequency bands based on self-resonance or coupling, enabling it to operate in multiple target frequency bands, covering low-frequency and mid-to-high-frequency bandwidths.

[0052] Figure 2 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 2 ,like Figure 2 As shown, the evaluation board 1 also includes: evaluation board pad group 12. Figure 3 Schematic diagram of the structure of the multi-band patch antenna provided in the embodiments of this application Figure 3 ,like Figure 3 As shown, the patch antenna 2 also includes a patch antenna pad group 22.

[0053] The evaluation board pad group 12 and the patch antenna pad group 22 are soldered one-to-one using SMT process.

[0054] Optionally, refer to Figure 2 and Figure 3 The evaluation board 1 also includes an evaluation board pad group 12, and the patch antenna 2 also includes a patch antenna pad group 22. When soldering the patch antenna 2 onto the evaluation board 1, the evaluation board pad group 12 and the patch antenna pad group 22 can be soldered one-to-one using SMT technology, which improves the firmness of the patch antenna 2 mounted on the evaluation board 1.

[0055] In this embodiment, when soldering the patch antenna onto the evaluation board, the evaluation board pad group of the evaluation board and the patch antenna pad group of the patch antenna are soldered one-to-one using the SMT process. This improves the robustness of the patch antenna mounting on the evaluation board, reduces installation costs, and facilitates integration.

[0056] As an optional implementation, the evaluation board pad group 12 includes: a first evaluation board pad 121, a second evaluation board pad 122, a third evaluation board pad 123, and a fourth evaluation board pad 124; the patch antenna pad group 22 includes: a first patch antenna pad 221, a second patch antenna pad 222, a third patch antenna pad 223, and a fourth patch antenna pad 224.

[0057] Optionally, continue to refer to Figure 2 and Figure 3 The evaluation board pad group 12 includes four evaluation board pads: a first evaluation board pad 121, a second evaluation board pad 122, a third evaluation board pad 123, and a fourth evaluation board pad 124, which are arranged sequentially on the evaluation board 1. Correspondingly, the patch antenna pad group 22 includes four patch antenna pads: a first patch antenna pad 221, a second patch antenna pad 222, a third patch antenna pad 223, and a fourth patch antenna pad 224, which are arranged sequentially on the patch antenna 2.

[0058] The first evaluation board pad 121 and the first patch antenna pad 221 are soldered together using SMT (Surface Mount Technology). The second evaluation board pad 122 and the second patch antenna pad 222 are soldered together using SMT. The third evaluation board pad 123 and the third patch antenna pad 223 are soldered together using SMT. The fourth evaluation board pad 124 and the fourth patch antenna pad 224 are soldered together using SMT.

[0059] Optionally, continue to refer to Figure 2 and Figure 3 The first evaluation board pad 121 is soldered to the first patch antenna pad 221, the second evaluation board pad 122 is soldered to the second patch antenna pad 222, the third evaluation board pad 123 is soldered to the third patch antenna pad 223, and the fourth evaluation board pad 124 is soldered to the fourth patch antenna pad 224 using SMT technology.

[0060] Among them, the SMT process has extremely high soldering precision, which can ensure the precise alignment of solder joints and guarantee the stability of the electrical connection of each solder joint. In addition, the small size of the SMT solder joints can reduce the space occupied on the evaluation board 1 and the patch antenna 2 during soldering, improve the compactness of the multi-band patch antenna layout, and further enhance the miniaturization of the multi-band patch antenna.

[0061] In this embodiment, the evaluation board pad group includes a first evaluation board pad, a second evaluation board pad, a third evaluation board pad, and a fourth evaluation board pad, and the patch antenna pad group includes a first patch antenna pad, a second patch antenna pad, a third patch antenna pad, and a fourth patch antenna pad. The first evaluation board pad is soldered to the first patch antenna pad, the second evaluation board pad is soldered to the second patch antenna pad, the third evaluation board pad is soldered to the third patch antenna pad, and the fourth evaluation board pad is soldered to the fourth patch antenna pad using SMT technology. This one-to-one soldering using SMT technology ensures the stability of the electrical connection between the evaluation board and the patch antenna, reduces the space occupied on the evaluation board and patch antenna during soldering, improves the compactness of the multi-band patch antenna layout, and further enhances the miniaturization of the multi-band patch antenna.

[0062] As an optional implementation, the patch antenna radiator 21 generates self-resonance in a first frequency band or a second frequency band, so that the multi-band patch antenna operates in a first target frequency band or a second target frequency band. The first target frequency band is 700MHz-960MHz, and the second target frequency band is 1700MHz-1900MHz.

[0063] Optionally, the patch antenna radiator 21 can generate multimode resonance, thereby forming effective energy radiation in the first frequency band when the first self-resonance condition is met, or forming effective energy radiation in the second frequency band when the second self-resonance condition is met.

[0064] Specifically, when the patch antenna radiator 21 satisfies the first self-resonance condition, it generates self-resonance in the first frequency band, so that the multi-band patch antenna operates in the first target frequency band. Alternatively, when the patch antenna radiator 21 satisfies the second self-resonance condition, it generates self-resonance in the second frequency band, so that the multi-band patch antenna operates in the second target frequency band.

[0065] In other words, when the first self-resonance condition is met, the patch antenna radiator 21 generates a self-resonance of 700MHz-960MHz, causing the multi-band patch antenna to operate in the 700MHz-960MHz range, covering the low-frequency bandwidth of 700MHz-960MHz. Alternatively, when the second self-resonance condition is met, it generates a self-resonance of 1700MHz-1900MHz, causing the multi-band patch antenna to operate in the 1700MHz-1900MHz range, covering the mid-to-high frequency bandwidth of 1700MHz-1900MHz.

[0066] In this embodiment, the patch antenna radiator generates self-resonance in a first frequency band, enabling the multi-band patch antenna to operate in a first target frequency band, covering a low-frequency bandwidth of 700MHz-960MHz. Alternatively, the patch antenna radiator generates self-resonance in a second frequency band, enabling the multi-band patch antenna to operate in a second target frequency band, covering a mid-to-high frequency bandwidth of 1700MHz-1900MHz. Through the self-resonance generated by the patch antenna radiator, the multi-band patch antenna covers both the low-frequency bandwidth of 700MHz-960MHz and the mid-to-high frequency bandwidth of 1700MHz-1900MHz.

[0067] As an optional implementation, the evaluation plate radiator 11 includes: a first evaluation plate radiator 111.

[0068] Optionally, continue to refer to Figure 1 and Figure 2 The evaluation plate radiator 11 includes a first evaluation plate radiator 111, wherein the first evaluation plate radiator 111 has an "L" shaped structure.

[0069] The first evaluation board radiator 111 couples with the patch antenna radiator 21 to generate resonance in the third frequency band, so that the multi-band patch antenna operates in the third target frequency band. The third target frequency band is 1900MHz-2100MHz.

[0070] Optionally, the first evaluation board radiator 111 and the patch antenna radiator 21 are relatively close. The first evaluation board radiator 111 and the patch antenna radiator 21 are each an independent electromagnetic structure. They generate resonance in the third frequency band through electromagnetic coupling, so that the multi-band patch antenna can work in the third target frequency band.

[0071] Specifically, the first evaluation board radiator 111 and the patch antenna radiator 21 are electromagnetically coupled to generate a resonance of 1900MHz-2100MHz, so that the multi-band patch antenna operates in the 1900MHz-2100MHz range, covering the mid-to-high frequency bandwidth of 1900MHz-2100MHz.

[0072] In this embodiment, the evaluation board radiator includes a first evaluation board radiator. The first evaluation board radiator and the patch antenna radiator are electromagnetically coupled to generate resonance in the third frequency band, so that the multi-band patch antenna operates in the third target frequency band, covering the mid-to-high frequency bandwidth of 1900MHz-2100MHz.

[0073] As an optional implementation, the evaluation plate radiator 11 further includes a second evaluation plate radiator 112.

[0074] Optionally, continue to refer to Figure 1 and Figure 2The evaluation plate radiator 11 also includes a second evaluation plate radiator 112, which is arranged parallel to one of the radiation branches of the first evaluation plate radiator 111, and the second evaluation plate radiator 112 is relatively close to the first evaluation plate radiator 111.

[0075] The second evaluation board radiator 112 couples with the patch antenna radiator 21 to generate resonance in the fourth frequency band, so that the multi-band patch antenna operates in the fourth target frequency band. The fourth target frequency band is 2100MHz-2300MHz.

[0076] Optionally, the second evaluation board radiator 112 and the patch antenna radiator 21 are also relatively close. The second evaluation board radiator 112 and the patch antenna radiator 21 are each an independent electromagnetic structure. They generate resonance in the fourth frequency band through electromagnetic coupling, so that the multi-band patch antenna can work in the fourth target frequency band.

[0077] Specifically, the second evaluation board radiator 112 and the patch antenna radiator 21 are electromagnetically coupled to generate a resonance of 2100MHz-2300MHz, so that the multi-band patch antenna operates in the 2100MHz-2300MHz range, covering the mid-to-high frequency bandwidth of 2100MHz-2300MHz.

[0078] In this embodiment, the evaluation board radiator also includes a second evaluation board radiator. The second evaluation board radiator and the patch antenna radiator are electromagnetically coupled to generate resonance in the fourth frequency band, so that the multi-band patch antenna operates in the fourth target frequency band, covering the mid-to-high frequency bandwidth of 2100MHz-2300MHz.

[0079] As an optional implementation, the first evaluation board radiator 111 and the second evaluation board radiator 112 are coupled to generate resonance in the fifth frequency band, so that the multi-band patch antenna operates in the fifth target frequency band. The fifth target frequency band is 2300MHz-2700MHz.

[0080] Optionally, continue to refer to Figure 1 and Figure 2 Since the second evaluation board radiator 112 is arranged parallel to one of the radiating branches of the first evaluation board radiator 111, and the first evaluation board radiator 111 and the second evaluation board radiator 112 are close to each other, the first evaluation board radiator 111 and the second evaluation board radiator 112 are each an independent electromagnetic structure, and generate resonance in the fifth frequency band through electromagnetic coupling, so that the multi-band patch antenna works in the fifth target frequency band.

[0081] Specifically, the first evaluation board radiator 111 and the second evaluation board radiator 112 generate a resonance of 2300MHz-2700MHz through electromagnetic coupling, so that the multi-band patch antenna operates in the 2300MHz-2700MHz range, covering the mid-to-high frequency bandwidth of 2300MHz-2700MHz.

[0082] In this embodiment, the first evaluation board radiator and the second evaluation board radiator are electromagnetically coupled to generate resonance in the fifth frequency band, so that the multi-band patch antenna operates in the fifth target frequency band, covering the mid-to-high frequency bandwidth of 2300MHz-2700MHz.

[0083] As an optional implementation, the evaluation board 1 also includes: patch antenna test points 13 and evaluation board ground layer 14.

[0084] The patch antenna test point 13 is located between the radiator 112 of the second evaluation board and the ground layer 14 of the evaluation board, so as to test the voltage standing wave ratio and radiation efficiency of the patch antenna 2 on the evaluation board 1 through the patch antenna test point 13.

[0085] Optionally, continue to refer to Figure 1 and Figure 2 The evaluation board 1 also includes patch antenna test points 13 and an evaluation board ground plane 14. The evaluation board ground plane 14 serves as the reference ground for the multi-band patch antenna, providing a stable reference potential.

[0086] The patch antenna test point 13 is the point on which the actual test is performed on the evaluation board 1. The patch antenna test point 13 is located between the radiator 112 of the second evaluation board and the ground layer 14 of the evaluation board. The voltage standing wave ratio and radiation efficiency of the patch antenna 2 on the evaluation board 1 are tested through the patch antenna test point 13.

[0087] Specifically, Figure 4 This is a schematic diagram of the voltage standing wave ratio (VSWR) of a multi-band patch antenna provided in an embodiment of this application. Figure 5 This is a schematic diagram illustrating the radiation efficiency of a multi-band patch antenna provided in an embodiment of this application, in conjunction with... Figure 4 and Figure 5 When the multi-band patch antenna operates in the range of 700MHz-960MHz, the voltage standing wave ratio remains below 4.0, and the radiation efficiency can reach more than 30%. When the multi-band patch antenna operates in the range of 1700MHz-2700MHz, the voltage standing wave ratio remains below 3.0, and the radiation efficiency can reach more than 65%.

[0088] Overall, when the multi-band patch antenna operates in each target frequency band, the voltage standing wave ratio (VSWR) remains below 4.0, and the radiation efficiency reaches over 30%. In other words, when the multi-band patch antenna covers the low-frequency bandwidth of 700MHz-960MHz and the mid-to-high-frequency bandwidth of 1700MHz-2700MHz, the VSWR remains below 4.0, and the radiation efficiency reaches over 30%.

[0089] In this embodiment, the evaluation board also includes patch antenna test points and an evaluation board ground plane. The evaluation board ground plane serves as the reference ground for the multi-band patch antenna, providing a stable reference potential. The patch antenna test points are located between the radiator of the second evaluation board and the evaluation board ground plane, allowing for the testing of the patch antenna's voltage standing wave ratio (VSWR) and radiation efficiency on the evaluation board.

[0090] This application also provides an alarm device, including: the multi-band patch antenna described in the foregoing embodiments, wherein the multi-band patch antenna is integrated inside the alarm device.

[0091] By integrating a multi-band patch antenna inside the alarm device, the size of the antenna inside the alarm device is reduced, and the coverage bandwidth of the multi-band patch antenna inside the alarm device is widened, thereby improving the reception effect of the alarm device.

[0092] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A multi-band patch antenna, characterized in that, include: Evaluation board and patch antenna set in the clearance area of ​​the evaluation board; The patch antenna includes at least: a patch antenna radiator; the evaluation board includes at least: an evaluation board radiator; The multi-band patch antenna generates self-resonance through the patch antenna radiator and resonance through coupling between the patch antenna radiator and the evaluation board radiator, thereby obtaining resonance in multiple frequency bands, so that the multi-band patch antenna can operate in multiple target frequency bands.

2. The multi-band patch antenna according to claim 1, characterized in that, The patch antenna radiator generates self-resonance in a first frequency band or a second frequency band, so that the multi-band patch antenna operates in a first target frequency band or a second target frequency band.

3. The multi-band patch antenna according to claim 2, characterized in that, The evaluation plate radiator includes: a first evaluation plate radiator; The first evaluation board radiator is coupled with the patch antenna radiator to generate resonance in the third frequency band, so that the multi-band patch antenna operates in the third target frequency band.

4. The multi-band patch antenna according to claim 3, characterized in that, The evaluation plate radiator further includes: a second evaluation plate radiator; The second evaluation board radiator is coupled with the patch antenna radiator to generate resonance in the fourth frequency band, so that the multi-band patch antenna operates in the fourth target frequency band.

5. The multi-band patch antenna according to claim 4, characterized in that, The first evaluation board radiator and the second evaluation board radiator are coupled to generate resonance in the fifth frequency band, so that the multi-band patch antenna operates in the fifth target frequency band.

6. The multi-band patch antenna according to claim 5, characterized in that, The first target frequency band is 700MHz-960MHz; The second target frequency band is 1700MHz-1900MHz; The third target frequency band is 1900MHz-2100MHz; The fourth target frequency band is 2100MHz-2300MHz; The fifth target frequency band is 2300MHz-2700MHz.

7. The multi-band patch antenna according to claim 1, characterized in that, The evaluation board further includes: an evaluation board pad group; the patch antenna further includes: a patch antenna pad group; The evaluation board pad group and the patch antenna pad group are soldered one-to-one using surface mount technology (SMT).

8. The multi-band patch antenna according to claim 7, characterized in that, The evaluation board pad group includes: a first evaluation board pad, a second evaluation board pad, a third evaluation board pad, and a fourth evaluation board pad; the patch antenna pad group includes: a first patch antenna pad, a second patch antenna pad, a third patch antenna pad, and a fourth patch antenna pad. The first evaluation board pads and the first patch antenna pads are soldered together using the SMT process. The second evaluation board pads and the second patch antenna pads are soldered together using the SMT process. The third evaluation board pads and the third patch antenna pads are soldered together using the SMT process. The fourth evaluation board pad and the fourth patch antenna pad are soldered together using the SMT process.

9. The multi-band patch antenna according to claim 4, characterized in that, The evaluation board also includes: patch antenna test points and an evaluation board grounding layer; The patch antenna test point is located between the radiator of the second evaluation board and the ground layer of the evaluation board, so as to test the voltage standing wave ratio and radiation efficiency of the patch antenna on the evaluation board through the patch antenna test point.

10. An alarm device, characterized in that, include: The multi-band patch antenna according to any one of claims 1-9, wherein the multi-band patch antenna is integrated inside the alarm device.

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