Dual-band dual-feed circularly polarized antenna with coupled radiators
By using a single-layer structure design with a coupled radiating plate, the problems of high cost, large thickness, and heavy weight of existing dual-frequency dual-fed circularly polarized antennas are solved, achieving cost reduction, thickness reduction, and performance improvement, making it suitable for portable devices and small drones.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAXING JINTONG ELECTRONICS TECH
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-07
AI Technical Summary
Existing dual-frequency dual-fed circularly polarized antennas suffer from high production costs, large overall thickness, and heavy weight, which limits their application in portable devices and small drones.
The single-layer structure design with coupled radiating patch is adopted, including a central radiating patch, a ring coupling patch, a dielectric layer, a circuit board, a feed pin and a grounding metal layer. Signal transmission and phase adjustment are achieved through microstrip lines and bridges, reducing costs and optimizing the signal transmission path.
It achieves a 30% reduction in cost, a 40% reduction in thickness, a 35% reduction in weight, and improves dual-frequency radiation efficiency and circular polarization performance, with an axial ratio superior to existing products.
Smart Images
Figure CN224472698U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of antenna technology, specifically relating to a dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate. Background Technology
[0002] With the continuous development of high-precision positioning technology, dual-frequency circularly polarized antennas, due to their excellent signal reception and anti-interference performance, are widely used in satellite navigation, communication base stations, autonomous driving, and other fields. Existing dual-frequency dual-fed circularly polarized antennas mostly adopt a double-layer structure design. While this structure can meet functional requirements, it suffers from high production costs, large overall thickness, and heavy weight, limiting its application in size-, weight-, and cost-sensitive scenarios, such as portable devices and small drones. Therefore, it is necessary to develop a novel dual-frequency dual-fed circularly polarized antenna that balances performance, cost, and size advantages. Utility Model Content
[0003] The main objective of this invention is to provide a dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate. Through a unique single-layer structure design and optimized component layout, it achieves dual-frequency operation and circular polarization characteristics while effectively reducing cost, thickness, and weight.
[0004] To achieve the above objectives, this utility model provides a dual-frequency, dual-fed circularly polarized antenna with a coupling radiating patch, comprising a central radiating patch, a ring coupling patch, a dielectric layer, a circuit board, a first feed pin, and a second feed pin, wherein:
[0005] Both the central radiating patch and the annular coupling patch are mounted on the first side of the dielectric layer, and the central radiating patch is located at the center of the first side of the dielectric layer. The annular coupling patch is provided with a first patch, a second patch, a third patch and a fourth patch distributed around the central radiating patch.
[0006] The first side of the circuit board is mounted on the second side of the dielectric layer, and a matching resistor, a bridge circuit, and a signal transmission interface are mounted on the second side of the circuit board. The matching resistor and the signal transmission interface are respectively connected to the bridge circuit.
[0007] The dielectric layer has a first ground metal layer, a second ground metal layer, a third ground metal layer and a fourth ground metal layer on its side. The first ground metal layer is connected between the first patch and the ground layer of the circuit board (the large area of copper on the surface of the circuit board is the ground layer). The second ground metal layer is connected between the second patch and the ground layer of the circuit board. The third ground metal layer is connected between the third patch and the ground layer of the circuit board. The fourth ground metal layer is connected between the fourth patch and the ground layer of the circuit board.
[0008] The first end of the first feed pin and the first end of the second feed pin are both mounted on the central radiating patch, and the second ends of the first feed pin and the second feed pin are both connected to the bridge after passing through the central radiating patch, the dielectric layer and the circuit board in sequence.
[0009] As a further preferred embodiment of the above technical solution, the circuit board is provided with microstrip lines, and both the first feed pin and the second feed pin are connected to the bridge via microstrip lines.
[0010] As a further preferred embodiment of the above technical solution, the central radiating patch has protruding ends on its four edges.
[0011] As a further preferred embodiment of the above technical solution, the first power supply needle and the second power supply needle are orthogonally arranged.
[0012] As a further preferred embodiment of the above technical solution, the signal transmission interface is used to output antenna signals to external devices. Attached Figure Description
[0013] Fig. 1 This is a structural schematic diagram of the present invention (front view).
[0014] Fig. 2 This is a structural schematic diagram of the present invention (reverse side).
[0015] The reference numerals in the attached figures include: 10, central radiating patch; 20, annular coupling patch; 21, first patch; 22, second patch; 23, third patch; 24, fourth patch; 30, dielectric layer; 31, first ground metal layer; 32, second ground metal layer; 40, circuit board; 41, matching resistor; 42, bridge circuit; 43, signal transmission interface; 50, first feed pin; 60, second feed pin. Detailed Implementation
[0016] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.
[0017] This utility model discloses a dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate. The specific embodiments of the utility model are further described below with reference to preferred embodiments.
[0018] In the embodiments of this utility model, those skilled in the art will note that the external devices and the like involved in this utility model can be considered as prior art.
[0019] Preferred embodiment.
[0020] like Figs. 1-2 As shown, this utility model discloses a dual-frequency, dual-fed circularly polarized antenna with a coupling radiating patch, comprising a central radiating patch 10, a ring coupling patch 20, a dielectric layer 30, a circuit board 40, a first feed pin 50, and a second feed pin 60, wherein:
[0021] Both the central radiating patch 10 and the annular coupling patch 20 are mounted on the first side of the dielectric layer 30, and the central radiating patch 10 is located at the center of the first side of the dielectric layer 30. The annular coupling patch 20 is provided with a first patch 21, a second patch 22, a third patch 23 and a fourth patch 24 distributed around the central radiating patch 10.
[0022] The first side of the circuit board 40 is mounted on the second side of the dielectric layer 30, and a matching resistor 41, a bridge 42 and a signal transmission interface 43 are mounted on the second side of the circuit board 40. The matching resistor 41 and the signal transmission interface 43 are respectively connected to the bridge 42.
[0023] The dielectric layer 30 has a first ground metal layer 31, a second ground metal layer 32, a third ground metal layer (not shown), and a fourth ground metal layer (not shown) on its side. The first ground metal layer 31 is connected between the first patch 21 and the ground layer of the circuit board 40 (the large copper area on the surface of the circuit board is the ground layer). The second ground metal layer 32 is connected between the second patch 22 and the ground layer of the circuit board 40. The third ground metal layer is connected between the third patch 23 and the ground layer of the circuit board 40. The fourth ground metal layer is connected between the fourth patch 24 and the ground layer of the circuit board 40 (this design enhances the coupling effect and optimizes the signal transmission path).
[0024] The first end of the first feed pin 50 and the first end of the second feed pin 60 are both mounted on the central radiating patch 10, and the second ends of the first feed pin 50 and the second feed pin 60 are connected to the bridge 42 after passing through the central radiating patch 10, the dielectric layer 30 and the circuit board 40 in sequence.
[0025] Specifically, the circuit board 40 is provided with microstrip lines (not shown), and the first feed pin 50 and the second feed pin 60 are both connected to the bridge 42 through the microstrip lines.
[0026] More specifically, the central radiating patch 10 has protruding ends on its four edges.
[0027] Furthermore, the first feed needle 50 and the second feed needle 60 are orthogonally arranged.
[0028] Furthermore, the signal transmission interface 43 is used to output antenna signals to external devices.
[0029] Regarding this utility model:
[0030] The central radiating patch is located in the main radiating structure, and the annular coupling patch surrounds the central radiating patch. Together, they achieve the dual-frequency radiation function.
[0031] The circuit board integrates microstrip lines and a bridge circuit. The microstrip lines employ a tapered structure to achieve good impedance matching with the feed pin. The bridge circuit is used for phase adjustment and power distribution of the input signal, ensuring that the antenna generates a circularly polarized wave. A matching resistor is connected in parallel to the output of the bridge circuit to further optimize the impedance characteristics of the antenna during dual-band operation. The signal transmission interface is a standard RF connector that connects to the bridge circuit, used to output the antenna signal to external devices.
[0032] This invention simplifies the manufacturing process through a single-layer structure design. Compared with the traditional double-layer structure, the production cost is reduced by about 30%, the overall thickness is reduced by 40%, and the weight is reduced by 35%. The design of metallized blind holes and gradient microstrip lines effectively improves the dual-frequency radiation efficiency and circular polarization performance of the antenna, and the axial ratio is superior to existing similar products.
[0033] It is worth mentioning that the technical features such as external devices involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.
[0034] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate, characterized in that, It includes a central radiating patch, a ring coupling patch, a dielectric layer, a circuit board, a first feed pin, and a second feed pin, wherein: Both the central radiating patch and the annular coupling patch are mounted on the first side of the dielectric layer, and the central radiating patch is located at the center of the first side of the dielectric layer. The annular coupling patch is provided with a first patch, a second patch, a third patch and a fourth patch distributed around the central radiating patch. The first side of the circuit board is mounted on the second side of the dielectric layer, and a matching resistor, a bridge circuit, and a signal transmission interface are mounted on the second side of the circuit board. The matching resistor and the signal transmission interface are respectively connected to the bridge circuit. The dielectric layer has a first ground metal layer, a second ground metal layer, a third ground metal layer and a fourth ground metal layer on its side. The first ground metal layer is connected between the first patch and the ground layer of the circuit board. The second ground metal layer is connected between the second patch and the ground layer of the circuit board. The third ground metal layer is connected between the third patch and the ground layer of the circuit board. The fourth ground metal layer is connected between the fourth patch and the ground layer of the circuit board. The first end of the first feed pin and the first end of the second feed pin are both mounted on the central radiating patch, and the second ends of the first feed pin and the second feed pin are both connected to the bridge after passing through the central radiating patch, the dielectric layer and the circuit board in sequence.
2. The dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate according to claim 1, characterized in that, The circuit board is equipped with microstrip lines, and both the first and second feed pins are connected to the bridge via microstrip lines.
3. A dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate according to claim 1, characterized in that, The central radiating patch has protruding ends around its four edges.
4. A dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate according to claim 2, characterized in that, The first and second feed pins are orthogonally arranged.
5. A dual-frequency, dual-fed circularly polarized antenna with a coupled radiating plate according to claim 1, characterized in that, The signal transmission interface is used to output antenna signals to external devices.