An air-dielectric coupled dual-frequency antenna

Abstract

This utility model discloses an air-dielectric coupled dual-band antenna, belonging to the field of dual-band antenna technology. It includes a PCB board serving as the antenna's supporting structure and integrating radio frequency circuitry. A ceramic antenna unit is positioned on top of the PCB board, and an FPC board is positioned above the ceramic antenna unit. A first foam pad is positioned between the PCB board and the ceramic antenna unit, and a second foam pad is positioned between the ceramic antenna unit and the FPC board. The microstrip line integrated into the FPC board connects to the ceramic pins of the ceramic antenna unit. This utility model achieves miniaturization while maintaining dual-band performance, and significantly reduces product costs.

Description

Technical Field

[0001] This utility model relates to the field of dual-frequency antenna technology, and in particular to an air-dielectric coupled dual-frequency antenna. Background Technology

[0002] The Global Positioning System (GPS) antenna is a key component for receiving satellite signals. With the development of technology, the market demand for dual-frequency GPS antennas that can simultaneously receive signals from multiple frequency bands such as L1 and L5 is increasing, in order to improve the accuracy and reliability of positioning.

[0003] Currently, there are two main technical solutions for conventional GPS dual-band antennas on the market. The first is to use a stacked ceramic structure, which achieves dual-band operation through the stacking of multiple ceramic layers. However, this solution has a complex structure and high cost. The second is to use a single large-size ceramic antenna, such as a 35mm x 35mm x 5mm ceramic unit. Although the dual-band problem can be solved on a single ceramic, it also has significant drawbacks. First, the 35mm x 35mm size is too large and cannot meet the stringent miniaturization requirements of modern electronic devices, especially in applications such as the central control of two-wheeled vehicles. Second, the cost of large-size ceramic antennas is also relatively high.

[0004] If a small conventional ceramic antenna (e.g., 25mm x 25mm) is used, in the traditional design, i.e. the ceramic is close to the PCB board, it can usually only achieve single-frequency operation and cannot meet the performance requirements of L1 and L5 dual-band. Therefore, how to achieve dual-band functionality of GPS antenna while controlling cost and size is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to achieve miniaturization while maintaining dual-frequency performance, and at the same time significantly reduce product costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an air-medium coupled dual-frequency antenna, comprising a PCB board serving as the antenna's supporting structure and integrating radio frequency circuitry, a ceramic antenna unit disposed above the PCB board, an FPC board disposed above the ceramic antenna unit, a first foam pad disposed between the PCB board and the ceramic antenna unit, a second foam pad disposed between the ceramic antenna unit and the FPC board, and a microstrip line integrated into the FPC board connecting to the ceramic pins of the ceramic antenna unit.

[0007] As a further description of the above technical solution: both the first foam pad and the second foam pad are elastic spacers with low dielectric constant.

[0008] As a further description of the above technical solution: the first foam pad forms a preset physical gap between the PCB board and the ceramic antenna unit, and the gap is filled with air, thereby forming a layer with air as the main medium.

[0009] As a further description of the above technical solution: the FPC board, as a radiation and coupling component, is electromagnetically coupled to the ceramic antenna unit below it.

[0010] As a further description of the above technical solution: the size of the ceramic antenna unit is 25mm x 25mm x 4mm.

[0011] As a further description of the above technical solution: the antenna can operate simultaneously in both GPS L1 and L5 dual-band frequencies.

[0012] As a further description of the above technical solution: through the coupling and tuning of the FPC board and the ceramic antenna unit, and combined with the air dielectric layer between the ceramic antenna unit and the PCB board, the ceramic antenna unit generates a new resonance mode to achieve dual-frequency operation.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] By employing a small-sized ceramic antenna unit and using a coupling structure of air, ceramic, and FPC, dual-band operation of GPS L1 and L5 was successfully achieved. This resolves the technical contradiction that traditional ceramic antennas can only operate at a single frequency, while dual-band ceramic antennas are too large. This meets the design requirements for miniaturization of electronic devices. Furthermore, by using a low-cost small-sized standard ceramic unit, combined with an FPC and foam pad, it replaces the expensive multilayer ceramic or large-sized dual-band ceramic antenna solutions. The design structure is simple and the material cost is low, thus significantly reducing the overall cost of the dual-band GPS antenna. At the same time, by leaving a certain distance between the ceramic antenna unit and the PCB board, using air as a medium, and coupling it with the FPC, a new and effective technical approach is provided to achieve dual-band performance. Attached Figure Description

[0015] Figure 1 An assembly diagram of this utility model is shown;

[0016] Figure 2 An exploded view of this utility model is shown;

[0017] Legend:

[0018] 10. PCB board; 11. Ceramic antenna unit; 12. FPC board; 13. First foam pad; 14. Second foam pad; 15. Microstrip line. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-2 This utility model provides a technical solution: an air-medium coupled dual-frequency antenna, including a PCB board 10, a ceramic antenna unit 11, an FPC board 12, a first foam pad 13, a second foam pad 14, and a microstrip line 15.

[0021] Specifically, the PCB board 10 is the base and load-bearing structure of the entire antenna, used to install and fix the various components of the antenna, and can integrate the corresponding radio frequency circuits.

[0022] The ceramic antenna element 11 is one of the main radiating components of the antenna. In this embodiment, the ceramic antenna element 11 is preferably a patch ceramic element with a size of 25mm x 25mm x 4mm. In traditional designs, ceramic elements of this size can usually only achieve single-frequency operation.

[0023] The first foam pad 13 is disposed between the PCB board 10 and the ceramic antenna unit 11. The first foam pad 13 is an elastic spacer with a low dielectric constant. Its main function is to form a preset physical distance between the ceramic antenna unit 11 and the PCB board 10. This distance is filled with air, thereby forming a layer between the ceramic antenna unit 11 and the PCB board 10 with air as the main medium. By leaving a certain distance between the ceramic antenna unit 11 and the PCB board 10 and using air as the medium, it is one of the key technologies to achieve the dual-band performance of this application.

[0024] The FPC board 12 (flexible circuit board) is located at the top of the antenna structure. The second foam pad 14, as an elastic spacer with the same low dielectric constant, is placed between the ceramic antenna unit 11 and the FPC board 12 to support and fix the FPC board 12 and maintain a specific positional relationship between it and the ceramic antenna unit 11.

[0025] The FPC board 12 serves as another key radiation and coupling component of the antenna, and it is electromagnetically coupled to the ceramic antenna unit 11 below it. The microstrip line 15 built into the FPC board 12 is connected to the ceramic pin of the ceramic antenna unit 11 for power feeding and signal transmission.

[0026] The working principle of this application is to use the first foam pad 13 to separate the conventional single-frequency 25mmx25mmx4mm ceramic antenna unit 11 from the PCB board 10 to form an air dielectric layer. Then, the top FPC board 12 is coupled and tuned to the ceramic antenna unit 11. This special structure of ceramic + air dielectric + FPC enables the ceramic antenna unit 11, which originally could only work in a single frequency band, to generate a new resonant mode, thereby expanding it into an antenna that supports GPS L1 and L5 dual-band operation.

[0027] This application employs a small-sized ceramic antenna unit 11 (25mm x 25mm x 4mm) and successfully achieves dual-frequency operation of GPS L1 and L5 through a coupling structure of air, ceramic, and FPC. This solves the technical contradiction that traditional 25mm x 25mm ceramics can only operate at a single frequency, while 35mm x 35mm dual-frequency ceramics are too large. This meets the design requirements for miniaturization of electronic devices. Furthermore, by using a low-cost small-sized standard ceramic unit, combined with FPC and foam pads, it replaces the expensive multilayer ceramic or large-sized (35mm x 35mm x 5mm) dual-frequency ceramic antenna solutions. This design has a simple structure and low material cost, thus significantly reducing the overall cost of the dual-frequency GPS antenna. At the same time, by leaving a certain distance between the ceramic antenna unit 11 and the PCB board 10, using air as a medium, and coupling with the FPC, a new and effective technical approach is provided to achieve dual-frequency performance.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An air dielectric coupled dual frequency antenna, characterized by, The system includes a PCB board (10) that serves as the carrier structure for the antenna and integrates radio frequency circuitry. A ceramic antenna unit (11) is provided on the top of the PCB board (10). An FPC board (12) is provided on the top of the ceramic antenna unit (11). A first foam pad (13) is provided between the PCB board (10) and the ceramic antenna unit (11). A second foam pad (14) is provided between the ceramic antenna unit (11) and the FPC board (12). The microstrip line (15) on the FPC board (12) is connected to the ceramic pin of the ceramic antenna unit (11).

2. An air coupled dual frequency antenna as claimed in claim 1, wherein: Both the first foam pad (13) and the second foam pad (14) are elastic spacers with low dielectric constant.

3. The air coupled dual band antenna of claim 1, wherein: The first foam pad (13) forms a preset physical gap between the PCB board (10) and the ceramic antenna unit (11), and the gap is filled with air, thereby forming a layer with air as the main medium.

4. The air coupled dual band antenna of claim 1, wherein: The FPC board (12) serves as a radiation and coupling component, and is electromagnetically coupled to the ceramic antenna unit (11) below it.

5. The air coupled dual band antenna of claim 1, wherein: The ceramic antenna unit (11) has a size of 25mm x 25mm x 4mm.

6. An air coupled dual frequency antenna as recited in claim 1, wherein: The antenna can operate simultaneously in both GPS L1 and L5 frequency bands.

7. The air coupled dual band antenna of claim 1, wherein: By coupling and tuning the FPC board (12) with the ceramic antenna unit (11), and combining the air dielectric layer between the ceramic antenna unit (11) and the PCB board (10), the ceramic antenna unit (11) generates a new resonance mode to achieve dual-frequency operation.

Images