Antenna module and digital key with same

Abstract

The antenna module comprises a grounding plate and an antenna main body, the antenna main body comprises a first side part, a second side part and a radiation part, the upper end of the first side part is connected with the radiation part, the lower end of the first side part is connected with the grounding plate, and the side edge of the first side part is connected with the second side part. And the second side part comprises a plurality of bending parts, and the lower end of the second side part is flush with the grounding plate, so that a structure supporting effect is provided for the antenna main body on the grounding plate. According to the utility model, the antenna main body generates a semi-directional field shape by utilizing the characteristic that the grounding plate reflects electromagnetic waves, and is prevented from being influenced by a metal structure behind the grounding plate. The second side part is bent for multiple times in the horizontal direction to form the bent part, and when the antenna main body is installed, the second side part can be utilized to provide a stable structure supporting effect, so that the antenna main body can be directly assembled on the surface of the grounding plate through an SMT process, the automation degree of processing is improved, and the stability, reliability and consistency of a processed product are improved.

Description

Technical Field

[0001] This utility model relates to the field of digital key product technology, and in particular to an antenna module and a digital key having the same. Background Technology

[0002] Traditional automotive digital key products typically employ a printed circuit board (PCB) antenna design. Since PCB antennas are manufactured directly on the circuit board, they radiate electromagnetic waves into the surrounding space during operation. The metal components of the circuit board (such as ground planes, power layers, and metal vias) and the automotive sheet metal structure reflect these electromagnetic waves, interfering with the antenna's original radiation pattern and causing it to deviate from its ideal state. This ultimately leads to problems such as increased antenna field non-circularity. Furthermore, this design requires reserved clearance area on the PCB board (i.e., clearance design), resulting in excessive module space usage.

[0003] Existing technologies also employ vertical antenna solutions (for example), which can solve problems such as poor antenna field shape and circularity to some extent, but also have the following drawbacks: due to the lack of auxiliary support, conventional vertical antennas can often only be assembled by manual spot welding, which is cumbersome and cannot meet the requirements of SMT (Surface Mount Technology) production processes.

[0004] Therefore, existing antenna module designs are insufficient to meet current user demands for car digital key products. Utility Model Content

[0005] In order to overcome the technical problems of poor antenna field shape non-circularity, large space occupation, and cumbersome manufacturing process of conventional vertical antenna design, the present invention provides an antenna module and a digital key therein.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] An antenna module comprising:

[0008] Flooring;

[0009] The antenna body includes a first side, a second side, and a radiating part. The upper end of the first side is connected to the radiating part, the lower end of the first side is connected to the ground plane, and the side of the first side is connected to the second side.

[0010] The second side portion includes multiple bends, and the lower end of the second side portion is flush with the ground plane, thereby providing structural support for the antenna body on the ground plane.

[0011] In the technical scheme, the ground plate can reflect the electromagnetic wave emitted by the antenna main body, so that the antenna main body generates a semi-directional field shape, and is not affected by the metal structure such as the automobile panel behind the ground plate, and the antenna field shape is optimized to reduce the roundness. In addition, the lower end of the plurality of bending parts of the second side part is flush with the ground plate, and the bending part can be used as a support when the antenna main body is installed, and the antenna main body is stable on the ground plate without any auxiliary components, and meets the SMT production process.

[0012] As a preferred scheme, a preset distance is provided between the radiation part and the ground plate, so that a first clearance is formed between the radiation part and the ground plate.

[0013] In the technical scheme, the first clearance formed between the radiation part and the ground plate serves as a natural clearance area, and additional clearance design is not required on the ground plate, the space occupation of the ground plate is reduced, and the overall layout design of the antenna module is optimized.

[0014] Further, the radiation part is a plate structure, and the plate structure is arranged in parallel with the ground plate.

[0015] In the technical scheme, the radiation part of the antenna main body is used to generate and radiate electromagnetic waves, and the upper surface of the ground plate is used as a reflecting surface to form a complete antenna structure together with the radiation part.

[0016] As a preferred scheme, the first side part includes a ground part and a feed part arranged at intervals, the ground part is connected with the ground plate, the feed part is connected with the radio frequency circuit, and a second clearance is formed between the ground part and the feed part.

[0017] In the technical scheme, the ground part is connected with the radiation part and the ground plate, and is used for grounding; the feed part is connected with the radiation part and the radio frequency circuit, and is used for providing energy for antenna radiation and signal transmission. In addition, the second clearance is used as part of the clearance area, further reducing the space occupation of the ground plate, and optimizing the overall layout design of the antenna module.

[0018] As a preferred scheme, the first side part, the second side part and the radiation part are an integrally formed structure.

[0019] In the technical scheme, the integrally formed antenna main body design can accurately control the positions of the feed point and the short circuit point, and the size and shape of the radiation part, so as to realize more stable impedance matching. It is helpful to reduce signal reflection and loss, and improve the radiation efficiency and overall performance of the antenna.

[0020] As a preferred solution, the second side portion comprises a first bending portion and a second bending portion, two sides of the first bending portion are connected with the first side portion and the second bending portion respectively, and the first side portion and the first bending portion and the first bending portion and the second bending portion are arranged perpendicularly.

[0021] In the above technical solution, the at least twice bending design of the first bending portion and the second bending portion can ensure that sufficient stable structural support is provided for the antenna main body.

[0022] Further, at least part of the structure of the second bending portion is recessed towards the ground plate, so that a third clearance is formed between the second bending portion and the radiation portion.

[0023] In the above technical solution, the third clearance serves as part of the clearance area, further reducing the space occupation of the ground plate and optimizing the overall layout design of the antenna module.

[0024] Further, the second side portion further comprises a third bending portion connected with the second bending portion, the third bending portion is arranged perpendicularly with the second bending portion, and the lower end of the third bending portion is connected with the ground plate.

[0025] In the above technical solution, since the lower end of the third bending portion is connected with the ground plate, the second side portion is also grounded, forming a parasitic branch of the antenna main body, which can resonate with the low frequency of the radiation portion, thereby expanding the low frequency bandwidth of the antenna main body.

[0026] As a preferred solution, the ground plate is a circuit board, and the antenna main body is a PIFA antenna.

[0027] Based on the same design idea, the utility model also provides a digital key comprising the above-mentioned antenna module.

[0028] In summary, the antenna module and the digital key with the same provided by the utility model have at least the following technical effects compared with the prior art:

[0029] 1) The antenna main body is assembled on the ground plate, and the characteristics of reflecting electromagnetic waves of the ground plate (since electromagnetic waves cannot or are difficult to penetrate the ground plate) are utilized to make the antenna main body generate a semi-directional field shape. When used outside the vehicle cabin, the ground plate is placed vertically, the main radiation direction of the antenna main body is towards the vehicle, and then the metal structure (vehicle sheet metal, etc.) behind the ground plate has little effect on the antenna field shape, so the vehicle can be successfully unlocked or started; when used inside the vehicle cabin, the ground plate is placed horizontally to form a uniform horizontal plane field shape that can cover the entire vehicle cabin interior space.

[0030] 2) the second side of the antenna body is bent multiple times in the horizontal direction to form multiple bending parts, and the lower end of the second side is flush with the ground plate. Therefore, when the antenna body is mounted on the surface of the ground plate, the second side can provide stable structural support to ensure that the antenna body is stable on the ground plate without the aid of any auxiliary components (such as a bracket). Thus, the assembly of the antenna body on the surface of the ground plate can be directly completed by the SMT process, improving the automation level of processing, and the stability, reliability and consistency of the processed products.

[0031] 3) the radiation plate is mounted on the ground plate through the first side, and a natural clearance area is formed between the radiation plate and the surface of the ground plate, providing a relatively pure electromagnetic environment for the antenna body, thereby reducing the space occupation of the ground plate and optimizing the overall layout design of the antenna module. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of the antenna module of the present application;

[0033] Figure 2 is a front view of the antenna module of the present application;

[0034] Figure 3 is an antenna horizontal plane field pattern when the antenna module of the present application is applied outside the automobile cabin;

[0035] Figure 4 is an antenna horizontal plane field pattern when the antenna module of the present application is applied inside the automobile cabin.

[0036] Among them, the meaning of the reference signs is as follows:

[0037] 1, ground plate; 2, first side; 21, ground part; 22, feed part; 3, second side; 31, first bending part; 32, second bending part; 33, third bending part; 4, radiation part; 5, first clearance; 6, second clearance; 7, third clearance. DETAILED DESCRIPTION

[0038] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0039] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0041] Referring to Figure 1 and Figure 2 As shown in the technical scheme of the utility model, the antenna module comprises a grounding plate 1 and an antenna body arranged on the grounding plate 1, the antenna body comprises a first side part 2, a second side part 3 and a radiation part 4, the upper end of the first side part 2 is connected with the radiation part 4, the lower end of the first side part 3 is connected with the grounding plate 1, and the side edge of the first side part 2 is connected with the second side part 3. Among them, the radiation part 4 is used to generate and radiate electromagnetic waves, and since the electromagnetic waves cannot or are difficult to penetrate the grounding plate 1, the grounding plate 1 has a reflection effect on the electromagnetic waves generated by the radiation part 4, so that the antenna body generates a semi-directional field shape above the grounding plate 1. When the grounding plate 1 is placed vertically, the main radiation direction (the coverage area of the semi-directional field shape) of the antenna body is towards the automobile, so that the metal structure (automobile sheet metal, etc.) behind the grounding plate 1 has little effect on the antenna field type, so that the vehicle can be smoothly unlocked or started.

[0042] Specifically, the second side part 3 is bent multiple times in the horizontal direction to form multiple bending parts, and the lower end of the second side part 3 is flush with the grounding plate 1. Through this structure design method, when the antenna body is installed on the upper surface of the grounding plate 1, the second side part 3 can provide stable structural support to the antenna body, ensuring that the antenna body is stable on the grounding plate 1 without the help of any auxiliary components (such as a bracket). Therefore, without manual spot welding, the assembly of the antenna body on the surface of the grounding plate 1 can be directly completed through the SMT process, improving the automation degree of processing, and the stability, reliability and consistency of the processed products.

[0043] In an alternative, the first side portion 2, the second side portion 3 and the radiation portion 4 are integrally formed, that is, the antenna body is designed in an integrally formed structure, so as to precisely control the positions of the feed point and the short circuit point of the antenna and the size and shape of the radiation portion, thereby realizing more stable impedance matching. This helps to reduce signal reflection and loss and improve the radiation efficiency and overall performance of the antenna body.

[0044] In an alternative, at least part of the structure of the ground plate 1 can be designed as a circuit board (i.e. a PCB board), and at least part of the structure of the antenna body can be designed as a PIFA antenna.

[0045] Referring to Figs. 1 and 2, Figure 1 In a preferred embodiment of the present application, a predetermined distance is provided between the radiation portion 4 and the ground plate 1, so as to form a first clearance 5 between the radiation portion 4 and the ground plate 1.

[0046] Further, referring to Figs. 1 and 2, Figure 2 The radiation portion 4 is designed in a plate structure, and the plate structure is arranged in parallel with the ground plate 1. The plate-shaped radiation portion 4 radiates electromagnetic waves downward, and the upper surface of the ground plate 1 is used as a reflecting surface, which cooperates with the radiation portion 4 to form a complete antenna structure. Moreover, the coupling between the radiation portion 4 and the ground plate 1 forms a large capacitance, which can expand the bandwidth of the antenna.

[0047] In particular, the radiation portion 4 is preferably designed in a rectangular plate structure.

[0048] Referring to Figs. 1 and 2, Figure 1 and Figure 2 In another preferred embodiment of the present application, the first side portion 2 includes a ground portion 21 and a feed portion 22 arranged in a spaced manner, the ground portion 21 is connected with the ground plate 1, the feed portion 22 is connected with the radio frequency circuit, and a second clearance 6 is formed between the ground portion 21 and the feed portion 22. Specifically, the ground portion 21 is connected with the radiation portion 4 and the ground plate 1 at the upper and lower ends thereof, respectively, for serving as a ground of the antenna body; the feed portion 22 is connected with the radiation portion 4 and the radio frequency circuit (not shown in the figures) at the upper and lower ends thereof, respectively, for providing energy for the radiation of the antenna body and serving as a signal transmission function. More specifically, the second clearance 6 formed between the ground portion 21 and the feed portion 22 can also be used as part of the clearance area of the antenna module, further reducing the space occupation of the ground plate 1 and optimizing the overall layout design of the antenna module.

[0049] Referring to Figs. 1 and 2, Figure 2As shown in the other preferred embodiment of the utility model, the second side part 3 includes the first bending part 1 and the second bending part 32, the two sides of the first bending part 313 are connected with the first side part 2 and the second bending part 32 respectively, and the first side part 2 and the first bending part 31 and the second bending part 32 are perpendicular to each other. Among them, the at least twice bending design formed by the first bending part 31 and the second bending part 32 can ensure that the second side part 3 provides sufficient stable structural support for the antenna main body. Specifically, since the first side part 2 and the first bending part 31 and the second bending part 32 are perpendicular to each other, the first side part 2, the first bending part 31 and the second bending part 32 form a U-shaped structure, which ensures that the antenna main body can still stand stably on the grounding plate 1 under the condition of applying external force in any direction in the SMT process.

[0050] Further, referring to Figure 2 As shown, at least part of the structure of the second bending part 32 is recessed towards the direction of the grounding plate 1, so as to form a third avoidance position 7 between the second bending part 32 and the radiation part 4. Among them, the third avoidance position is used as part of the clearance area, further reducing the space occupation of the grounding plate 1, and optimizing the overall layout design of the antenna module.

[0051] Further, referring to Figure 2 As shown, the second side part 3 further includes a third bending part 33 connected with the second bending part 32, the third bending part 33 is perpendicular to the second bending part 32, and the lower end of the third bending part 33 is connected with the grounding plate 1. On the one hand, the third bending part 33 makes the second side part 3 form a three-bending structure design, further increases the contact area between the second side part 3 and the grounding plate 1, further improves the auxiliary support effect on the antenna main body, and improves its stability on the grounding plate 1. On the other hand, since the lower end of the third bending part 33 is connected with the grounding plate 1, the second side part 3 is also grounded, forming a parasitic branch of the antenna main body, which can resonate with the low frequency of the radiation part 4, thereby playing an expanding role in increasing the low frequency bandwidth of the antenna main body.

[0052] Based on the same design idea, the utility model also provides a digital key, which comprises the antenna module of the above embodiment.

[0053] By applying the antenna module of the utility model, the digital key of the utility model can achieve good control effect when applied to vehicle unlocking or starting function. Specifically:

[0054] Referring to Figure 3As shown, since the antenna main body of the utility model can produce semi-directional field shape in the direction perpendicular to the grounding plate 1, when the digital key of the utility model is applied outside the vehicle cabin, the grounding plate 1 is placed vertically, and the main radiation direction of the antenna main body is towards the automobile, then the metal structure (automobile sheet metal, etc.) behind the grounding plate 1 has no influence or less influence on the antenna field type, and the unlocking or starting operation on the vehicle can be smoothly completed.

[0055] Referring to Figure 4 As shown, since the antenna main body of the utility model can produce uniform field shape with better non-circularity in the horizontal plane direction of the grounding plate 1, when the digital key of the utility model is applied inside the vehicle cabin, the entire vehicle cabin internal space can be covered.

[0056] The technical means disclosed by the utility model scheme is not only limited to the technical means disclosed by the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. An antenna module, characterized by The antenna module comprises: a ground plate; an antenna body, the antenna body comprising a first side, a second side and a radiation part, an upper end of the first side being connected to the radiation part, a lower end of the first side being connected to the ground plate, a side edge of the first side being connected to the second side; wherein the second side comprises a plurality of bending parts, and a lower end of the second side is flush with the ground plate, thereby providing structural support for the antenna body on the ground plate.

2. The antenna module of claim 1, wherein, A preset distance is provided between the radiation part and the ground plate, so as to form a first clearance between the radiation part and the ground plate.

3. The antenna module of claim 2, wherein, The radiation part is in a plate structure, and the plate structure is parallel to the ground plate.

4. The antenna module of claim 1, wherein, The first side comprises a ground part and a feed part arranged at intervals, the ground part being connected to the ground plate, the feed part being connected to a radio frequency circuit, and a second clearance being formed between the ground part and the feed part.

5. The antenna module of claim 1, wherein, The first side, the second side and the radiation part are in an integral forming structure.

6. The antenna module of claim 1, wherein, The second side comprises a first bending part and a second bending part, two sides of the first bending part being respectively connected to the first side and the second bending part, and the first side and the first bending part, and the first bending part and the second bending part being arranged perpendicularly to each other.

7. The antenna module of claim 6, wherein, At least part of the structure of the second bending part is recessed towards the ground plate, so as to form a third clearance between the second bending part and the radiation part.

8. The antenna module of claim 6, wherein, The second side further comprises a third bending part connected to the second bending part, the third bending part being arranged perpendicularly to the second bending part, and a lower end of the third bending part being connected to the ground plate.

9. The antenna module of claim 1, wherein, The ground plate is a circuit board, and the antenna body is a PIFA antenna.

10. A digital key, characterized by The antenna module comprises any one of 1-9. The antenna module comprises any one of 1-9.

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