Small 5.8 G dual-polarized microstrip antenna applied to microwave mobile sensor
By using FR4 dielectric plates, U-shaped grooves, metal feed vias and other designs in small 5.8G dual-polarized microstrip antennas, the problems of double-polarized antenna size reduction and RF chip grounding difficulties are solved, and good impedance is achieved Matching and RF performance improvements.
Patent Information
- Application Number
- CN202420711644.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-04-08
AI Technical Summary
Existing microstrip dual-polarized patch antennas have difficulties in volume reduction and RF chip grounding, especially the problem of feed port position and impedance matching, resulting in reduced efficiency.
A small 5.8G dual-polarized microstrip antenna is designed, using cheap FR4 dielectric plates. By setting a U-shaped groove and metal feed via on the metal antenna patch, the deviation and impedance matching of the feed port are achieved, and the A metal via is provided in the center of the antenna to facilitate grounding of the RF chip.
The miniaturization and impedance matching of dual-polarized microstrip antennas are achieved, which solves the problems of feed port position and RF chip grounding, and improves RF working performance.
Smart Images
Figure CN222365728U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of antenna technology, in particular to a small 5.8G dual-polarization microstrip antenna applied to a microwave mobile sensor. Background Art
[0002] At present, the microstrip patch antennas used in mobile sensors are basically made of ordinary FR4 dielectric plates and microwave dielectric plates. Ordinary FR4 dielectric plates have the characteristics of low cost and easy processing, but their microwave loss is relatively large, and the dielectric constant is generally around 4.3. This limits the resonant direction of the 5.8GHz microstrip patch antenna designed with it to be approximately 11.5mm. With the development of the times, people are increasingly pursuing smaller electronic devices, and the volume of antennas is also required to be smaller. For single-polarized antennas, it is usually possible to obtain a smaller antenna size by means of slotting and loading. However, for dual-polarized antennas, it is relatively difficult, and improper handling may lead to increased coupling of the two polarizations. Secondly, the feed deviation from the center position of the general microstrip antenna determines its input impedance. For 50Ω matching, the feed port deviation from the center is relatively small. If it is expected that the RF chip with a relatively large package can be fed directly on the back, a blind hole process must be used, or the feed port must be directly moved outward, which will increase the input impedance, resulting in mismatch with 50Ω, reduced efficiency, and reduced RF working performance. Utility Model Content
[0003] The purpose of the utility model is to address the technical problems existing in the background technology and propose a small 5.8G dual-polarization microstrip antenna applied to a microwave mobile sensor, including a dielectric substrate, wherein a metal antenna patch is arranged on the top end surface of the dielectric substrate and a grounding metal layer is arranged on the bottom end surface. Furthermore, the dual-polarization microstrip antenna of the utility model also includes a first slot and a metal feeding via arranged on the metal antenna patch, the metal feeding via passes through the metal antenna patch and the dielectric substrate, the first slot is provided with a feeding port at the bottom of the slot, and the feeding port is connected to the receiving port and the transmitting port of an external transceiver through the metal feeding via.
[0004] Furthermore, the feeding port is arranged offset from the center of the metal antenna patch.
[0005] Furthermore, the first slot is arranged in a "U" shape, and the first slot includes a first U-shaped slot unit and a second U-shaped slot unit, and the first U-shaped slot unit and the second U-shaped slot unit are arranged orthogonally to each other.
[0006] Furthermore, the metal antenna patch includes a plurality of second slots, and the second slots are symmetrically arranged with respect to the center of the metal antenna patch.
[0007] Further, the second groove includes a first groove unit and a second groove unit, and one end of the first groove unit is connected to one end of the second groove unit.
[0008] Further, the first groove unit is arranged perpendicular to the second groove unit.
[0009] Furthermore, four groups of second slots are provided, and the four groups of second slots are used to reduce the operating frequency of the metal antenna patch.
[0010] Furthermore, the metal antenna patch includes two orthogonal resonance modes to radiate and generate two orthogonal polarizations respectively.
[0011] Furthermore, the metal antenna patch has a plurality of metal vias symmetrically distributed at the center, and the metal vias penetrate the metal antenna patch and the dielectric substrate.
[0012] Furthermore, the metal antenna patch is arranged in a symmetrical shape.
[0013] Compared with the prior art, the utility model has the following beneficial technical effects: the utility model uses cheap FR4 dielectric board material to realize a miniaturized dual-polarized microstrip patch antenna, and solves the technical problem that "the feeding port distance of the ordinary microstrip dual-polarized patch antenna is relatively close, and the large pad in the center of the RF chip of the small-sized board cannot be grounded by through-hole", which is convenient for use under certain specific conditions. Specifically, the utility model reduces the operating frequency of the antenna by setting four symmetrical groups of second slots, and realizes the miniaturization of the dual-polarized microstrip patch antenna. Furthermore, the feeding port of the utility model adds a U-shaped slot unit, which can well solve the contradiction between impedance matching and feeding port position, and can move the feeding port position to a position away from the center of the metal antenna patch, while achieving good impedance matching. Furthermore, the utility model sets one or more metal vias at the geometric center of the metal antenna patch to facilitate the grounding of the large pad in the center of the RF chip. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a top view of the utility model;
[0015] Figure 2 This is a side view of the utility model. DETAILED DESCRIPTION
[0016] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0017] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a specific connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0019] The specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0020] like Figure 1-Figure 2 As shown, the utility model proposes a small 5.8G dual-polarization microstrip antenna applied to a microwave mobile sensor, comprising a dielectric substrate 1, wherein the dielectric substrate 1 is provided with a metal antenna patch 2 on the top end surface and a grounding metal layer 3 on the bottom end surface. Further, the dual-polarization microstrip antenna also includes a first slot 21 and a metal feeding via 22 arranged on the metal antenna patch 2, the metal feeding via 22 passes through the metal antenna patch 2 and the dielectric substrate 1, the first slot 21 is provided with a feeding port at the bottom of the slot, and the feeding port is connected to the receiving port and the transmitting port of the external transceiver through the metal feeding via 22.
[0021] Specifically, in this embodiment, the feeding port is set away from the center of the metal antenna patch 2, and the first slot 21 is set in a "U" shape. The first slot 21 includes a first U-shaped slot unit 211 and a second U-shaped slot unit 212. The first U-shaped slot unit 211 and the second U-shaped slot unit 212 are set orthogonally to each other.
[0022] It can be understood that the two groups of orthogonally arranged U-shaped slot units can meet the impedance matching of the metal antenna patch 2. Furthermore, adding a U-shaped slot unit to the feeding port can well solve the contradiction between impedance matching and the feeding port position, and can move the feeding port position to a position away from the center of the metal antenna patch 2 while achieving good impedance matching.
[0023] Furthermore, in this embodiment, the metal antenna patch 2 includes a plurality of second slots 23, and the second slots 23 are symmetrically arranged about the center of the metal antenna patch 2. Specifically, the second slots 23 include a first slot unit 231 and a second slot unit 232, and one end of the first slot unit 231 is connected to one end of the second slot unit 232.
[0024] As an implementation of this embodiment, the first groove unit 231 is arranged perpendicular to the second groove unit 232, and four groups of second slots 23 are arranged, and the four groups of second slots 23 are used to reduce the operating frequency of the metal antenna patch 2. It can be understood that the utility model has four symmetrical groups of second slots 23, which can reduce the operating frequency of the antenna, thereby further reducing the volume of the dual-polarized microstrip patch antenna.
[0025] Furthermore, in this embodiment, the metal antenna patch 2 can have any shape, such as a symmetrical shape such as a square, a circle, an octagon, etc. The metal antenna patch 2 includes two orthogonal resonance modes to radiate and generate two orthogonal polarizations respectively.
[0026] Furthermore, in this embodiment, the metal antenna patch 2 has a plurality of metal vias 24 symmetrically distributed in the center, and the metal vias 24 penetrate the metal antenna patch 2 and the dielectric substrate 1. It can be understood that the metal vias 24 can connect the metal antenna patch 2 with the ground metal layer 3 and can meet the grounding of the large pad in the center of the RF chip.
[0027] Furthermore, in this embodiment, the dielectric substrate 1 is made of cheap FR4 material.
[0028] In summary, it can be understood that the utility model uses cheap FR4 dielectric board material to realize a miniaturized dual-polarized microstrip patch antenna, and solves the technical problem that "the feeding port distance of the ordinary microstrip dual-polarized patch antenna is relatively close, and the large pad in the center of the RF chip of the small-sized board cannot be grounded by through-hole", which is convenient for use under certain specific conditions. Specifically, the utility model reduces the operating frequency of the antenna by setting four symmetrical groups of second slots, and realizes the miniaturization of the dual-polarized microstrip patch antenna. Furthermore, the feed port of the utility model adds a U-shaped slot unit, which can well solve the contradiction between impedance matching and feed port position, and can move the feed port position to a position away from the center of the metal antenna patch 2, while achieving good impedance matching. Furthermore, the utility model sets one or more metal vias 24 at the geometric center of the metal antenna patch 2 to facilitate the grounding of the large pad in the center of the RF chip.
[0029] The above are one or more implementation methods provided in combination with specific content, and it is not intended that the specific implementation of the utility model is limited to these descriptions. Any method, structure, etc. similar to or identical to the method, structure, etc. of the utility model, or any technical deduction or replacement based on the concept of the utility model, shall be deemed to be within the protection scope of the utility model.
Claims
1. A small 5.8G dual-polarization microstrip antenna for use in a microwave mobile sensor, comprising a dielectric substrate (1), wherein the dielectric substrate (1) is provided with a metal antenna patch (2) on the top end surface and a grounding metal layer (3) on the bottom end surface, characterized in that: It also includes a first slot (21) and a metal feed via (22) arranged on the metal antenna patch (2), wherein the metal feed via (22) penetrates the metal antenna patch (2) and the dielectric substrate (1), and the first slot (21) is provided with a feed port at the bottom of the slot, and the feed port is connected to the receiving port and the transmitting port of the transceiver through the metal feed via (22).
2. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The feeding port is arranged offset from the center of the metal antenna patch (2).
3. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The first slot (21) is arranged in a "U" shape, and the first slot (21) comprises a first U-shaped slot unit (211) and a second U-shaped slot unit (212), and the first U-shaped slot unit (211) and the second U-shaped slot unit (212) are arranged orthogonally to each other.
4. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The metal antenna patch (2) comprises a plurality of second slots (23), wherein the second slots (23) are arranged symmetrically to the center of the metal antenna patch (2).
5. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 4, characterized in that: The second groove (23) comprises a first groove unit (231) and a second groove unit (232), and one end of the first groove unit (231) is connected to one end of the second groove unit (232).
6. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 5, characterized in that: The first groove unit (231) is arranged perpendicular to the second groove unit (232).
7. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 4, characterized in that: Four groups of the second slots (23) are provided, and the four groups of the second slots (23) are used to reduce the operating frequency of the metal antenna patch (2).
8. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The metal antenna patch (2) comprises two orthogonal resonance modes to respectively radiate and generate two orthogonal polarizations.
9. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The metal antenna patch (2) has a plurality of metal vias (24) symmetrically distributed at the center, and the metal vias (24) penetrate the metal antenna patch (2) and the dielectric substrate (1).
10. The small 5.8G dual-polarization microstrip antenna for microwave mobile sensor according to claim 1, characterized in that: The metal antenna patch (2) is arranged in a symmetrical shape.