Radio frequency input coupler
Through the separated structure and cooling-designed RF input coupler, the problems of disassembly and low power of existing RF power couplers are solved, high power transmission and stability are improved, and production difficulty and cost are reduced.
Patent Information
- Application Number
- CN202422465815.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-12
AI Technical Summary
Existing RF power couplers need to be disassembled when adjusting the coupling ring angle and bear low power.
The RF input coupler adopts a separate structure, including a cavity, RF input port, RF output port and coupling port, a PCB board and a heat dissipation board, a cooling pipe, a ceramic insulator and a sealing gasket, a non-linear coupling line is set on the PCB board, and the cooling medium flows out heat, supporting high power transmission.
It realizes rapid adjustment of the resonant cavity input impedance and supports RF power transmission of 100 kW level. It has a compact structure and simple operation, reducing production difficulty and cost, and improving stability and anti-interference ability.
Smart Images
Figure CN223181371U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of radio frequency couplers, in particular to a radio frequency input coupler. Background Art
[0002] A coupler is a microwave device widely used in microwave systems. The signal acquisition and injection module of a radar feeder system, the power meter in a signal generator, the control module of a high-power microwave heating device, and some microwave circuits can achieve real-time control of communication systems and feeder systems and operate efficiently and stably through the monitoring function of a directional coupler. Key microwave devices such as frequency stabilization devices, attenuators, and mixers also require directional couplers for power distribution and synthesis.
[0003] Couplers have a wide range of applications and various types. In some occasions, the requirements for their various performances are even very harsh. It is necessary to comprehensively consider the actual application scenarios and corresponding technical index requirements, and combine various factors such as cost, physical structure, and processing technology to conduct effective design of the directional coupler so that it can work efficiently and stably without interfering with the original system.
[0004] The disadvantages of existing radio frequency power couplers are as follows: First, the structure of the coaxial feeder conversion part is simple, and it is troublesome to disassemble and adjust when adjusting the angle of the coupling ring; second, the power that the internal coupling ring part can withstand is relatively low. Summary of the Invention
[0005] In view of this, the utility model provides a radio frequency input coupler, aiming to solve the problems of inconvenient disassembly and low power.
[0006] On the one hand, the utility model provides a radio frequency input coupler, including:
[0007] A coupler body, a radio frequency input port, a radio frequency output port, and two coupling ports;
[0008] A cavity is arranged inside the coupler body, the radio frequency input port and the radio frequency output port are correspondingly arranged on both sides of the coupler body, two coupling ports are arranged on the other side of the coupler body, a first insulator is arranged inside the cavity, a PCB board and a heat dissipation board are arranged inside the first insulator, the heat dissipation board is attached to the PCB board, and the radio frequency output port is connected to the outer ring flange of the coupler body.
[0009] Further, for the radio frequency input coupler described above,
[0010] Cooling pipes are arranged inside the cavity, a cooling pipe inlet and a cooling pipe outlet are arranged on the coupler body, and cooling components are arranged inside the radio frequency input port and the radio frequency output port, and the cooling components are cooling cavities.
[0011] Further, for the RF input coupler,
[0012] the RF input port is an N-type RF input port, and the output port is an isolated output microstrip port.
[0013] Further, for the RF input coupler,
[0014] At least two ground vias are provided on the PCB.
[0015] Further, for the RF input coupler,
[0016] A second insulator is provided inside the two coupling ports. A conductor is provided inside the second insulator, and the conductor is supported and fixed in the coupling ports through the second insulator.
[0017] Further, for the RF input coupler,
[0018] A sealing washer is provided between the two coupling ports and the coupler body, and the coupling ports are fixedly connected to the coupler body.
[0019] Further, for the RF input coupler,
[0020] The coupling line on the PCB is arranged in a non-linear structure, and the other coupling line is in a linear structure to increase the length of the coupling line.
[0021] Further, for the RF input coupler,
[0022] A connecting member is arranged between the PCB and the first insulator.
[0023] Further, for the RF input coupler,
[0024] The size of the PCB is the same as that of the heat dissipation plate.
[0025] Further, for the RF input coupler,
[0026] Both the first insulator and the second insulator are made of ceramic materials.
[0027] Compared with the prior art, the beneficial effects of the present utility model are as follows. A separated structure is adopted, and its ceramic window has a simple and compact structure, with relatively low manufacturing difficulty and cost. The cooling flow channel of the coupler body can quickly carry out the heat generated by power loss through the circulation of the cooling medium, and its heat dissipation effect is significantly better than that of water-cooled structures such as double spiral flow channels, which can better meet the RF input requirements of high-power accelerators. The fed RF power can be stabilized at the level of hundreds of kW, and the input impedance of the resonant cavity can be adjusted quickly and conveniently. In addition, the coupling ring part of the present utility model can be shaped or replaced according to actual needs, and the operation is simple and easy. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0029] Figure 1 is a three-dimensional structural schematic diagram of the RF input coupler provided by an embodiment of the present utility model;
[0030] Figure 2 is a cross-sectional view of the RF input coupler provided by an embodiment of the present utility model;
[0031] Figure 3 is a structural schematic diagram of the PCB board provided by an embodiment of the present utility model.
[0032] In the figure: 100 - coupler body; 101 - RF input port; 102 - RF output port; 103 - coupling port; 104 - flange; 105 - cooling pipe inlet; 106 - cooling pipe outlet; 200 - second insulator; 201 - first insulator; 202 - sealing washer; 203 - cooling cavity; 300 - PCB board; 301 - connecting piece; 302 - joint pad; 303 - PCB cover plate; 304 - mounting screw. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.
[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0035] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.
[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0037] Refer to Figure 1 and Figure 2 As shown, this embodiment provides a radio frequency input coupler, including a coupler body 100, a radio frequency input port 101, a radio frequency output port 102, and two coupling ports 103;
[0038] Specifically, a cavity is provided inside the coupler body 100. The radio frequency input port 101 and the radio frequency output port 102 are correspondingly provided on both sides of the coupler body 100. Two coupling ports 103 are provided on another side of the coupler body 100. A first insulator 201 is provided inside the cavity. A PCB board 300 and a heat dissipation plate are provided inside the first insulator 201. The heat dissipation plate is attached to the PCB board 300. The radio frequency output port 102 is connected to the outer ring flange 104 of the coupler body 100.
[0039] As can be seen from the above, the RF input coupler adopts a split structure. The coupler body 100 is provided with a cavity for accommodating the first insulator 201, the PCB board 300 inside the first insulator 201, and the heat sink on the rear side of the PCB board 300. The coupler body 100 is provided with an RF input port 101 and an RF output port 102 on both sides, and two coupling ports 103 are provided on the other side of the coupler body 100. The RF input port 101, the RF output port 102, and the two coupling ports 103 of the coupler body 100 are all provided with mounting screws 304. The mounting screws 304 are used to fix the RF input port 101, the RF output port 102, and the two coupling ports 103 to the coupler body 100. The RF output port 102 is connected to the outer ring flange 104 of the coupler body 100.
[0040] Specifically, the RF input coupler adopts a separate structure, which is simple and compact, with low manufacturing difficulty and cost. The RF input port 101, the RF output port 102, and the two coupling ports are fixed, which can improve the firmness of the actual connector and avoid the loosening of the connector due to insufficient force of the connection only through perforation and internal welding, which is not conducive to actual long-term use. The heat sink is set on the rear side of the PCB board 300, which can slightly reduce the heat generated by the PCB board 300.
[0041] Specifically, a cooling pipe is provided inside the cavity of the RF input coupler, a cooling pipe inlet 105 and a cooling pipe outlet 106 are provided on the coupler body 100, and a cooling component is provided inside the RF input port 101 and the RF output port 102, and the cooling component is a cooling cavity 203.
[0042] Specifically, the RF input coupler receives a pulse signal and generates heat in the process of amplifying and outputting the signal. A cooling pipe is provided inside the cavity of the RF input coupler to quickly remove the heat. The coolant enters the cooling pipe from the cooling pipe inlet 105 and is discharged from the cooling pipe outlet 106, which facilitates the replacement of the coolant. A cooling component is provided inside the RF input port 101 and the RF output port 102. The cooling component is a cooling cavity 203, which further cools the RF input coupler and can withstand higher transmission power without mechanical deformation.
[0043] Specifically, the radio frequency input coupler is provided with cooling channels that can better cover the heat - generating areas of the coupler body 100. Through the flow of the cooling medium, the heat generated by power loss can be quickly carried out. The coolant enters the cooling pipe from the cooling pipe inlet 105 and is discharged from the cooling pipe outlet 106, which facilitates the replacement of the coolant. Cooling components are provided inside the radio frequency input port 101 and the radio frequency output port 102. The cooling components are cooling cavities 203, which further cool the radio frequency input coupler to avoid mechanical deformation caused by excessive temperature during high - power transmission.
[0044] Specifically, the radio frequency input port 101 of the radio frequency input coupler is an N - type radio frequency input port 101, and the output port is an isolated output microstrip port.
[0045] Specifically, when this radio frequency coupler is connected to a base station, a repeater, and an indoor wiring system, since the microstrip line of the isolated output microstrip port is welded to the using device, and the coupler body 100 is fixedly installed with the using device, the coupler body 100 can be effectively fixed in the system, realizing the stability of microwave transmission.
[0046] Specifically, at least two ground vias are provided on the PCB board 300 of the radio frequency input coupler.
[0047] Specifically, the ground vias provided on the PCB board 300 of the radio frequency input coupler can improve the signal integrity and reduce noise; if the potentials of two planes are the same, adding additional ground vias can provide a low - impedance path for signal return, ensuring the signal quality.
[0048] Specifically, a second insulator 200 is provided inside the two coupling ports of the radio frequency input coupler. A conductor is provided inside the second insulator 200, and the conductor is supported and fixed in the coupling port through the second insulator 200.
[0049] Specifically, after adopting the above structure, since there are two coupling ports on the coupler body 100, conductors are provided inside the two coupling ports, one end of the conductor is provided with an SMA - type isolation port, and the other end is connected to the radio frequency input end, the coupler can be directly connected to the radio frequency unit through the SMA - type isolation port, thereby measuring the coupling degree in the entire coupling system; it directly simplifies the docking scheme between the coupler and the radio frequency unit, making it very easy to dock the isolation port and the radio frequency port. The measurement system using this radio frequency coupler is more than 2 times smaller in volume than the existing measurement system, so the space utilization rate is extremely high.
[0050] Specifically, a sealing gasket 202 is provided between the two coupling ports of the radio frequency input coupler and the coupler body 100, and the coupling port is fixedly connected to the coupler body 100. The sealing performance between the coupling port and the coupler body 100 is improved, making the connection more stable.
[0051] Refer to Figure 3 As shown, the coupling line of the PCB board 300 inside the radio frequency input coupler is set to a non-linear structure, and the other coupling line is a linear structure, increasing the length of the coupling line.
[0052] Specifically, four joint pads 302 are provided on the top surface of the PCB board 300. The four joint pads 302 are respectively welded to the inner cores of the radio frequency input port 101, the radio frequency output port 102, and the inner connection ends of the two coupling ports. The above structure improves the tolerance of the coupler to process variations. In the design of traditional radio frequency couplers, by changing one of the coupling lines to an oblique line or a stepped trace, the coupling length is increased, and at the same time, the resistance of the coupler parameters to process variations is improved, and the consistency and anti-interference ability of the coupler are improved.
[0053] Specifically, a connecting piece 301 is arranged between the PCB board 300 of the radio frequency input coupler and the first insulator 201. The heat dissipation plate is placed between the PCB board 300 and the first insulator 201 and fixed with the connecting piece 301.
[0054] Specifically, the size of the PCB board 300 is the same as that of the heat dissipation plate. The heat dissipation plate makes the heat dissipation of the PCB board 300 uniform. The same size also facilitates the installation between the PCB board 300, the heat dissipation plate, and the first insulator 201, making the structure more compact.
[0055] Specifically, both the first insulator 201 and the second insulator 200 of the radio frequency coupler are ceramic materials, which have the advantage of small high-frequency loss, can effectively reduce the loss during high-power transmission, and improve the fed-in power.
[0056] Those of ordinary skill in the art can understand that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A radio frequency input coupler, characterized in that, Including: A coupler body, a radio frequency input port, a radio frequency output port and two coupling ports; A cavity is provided inside the coupler body. The radio frequency input port and the radio frequency output port are correspondingly provided on both sides of the coupler body. Two coupling ports are provided on the other side of the coupler body. A first insulator is provided inside the cavity. A PCB board and a heat sink are provided inside the first insulator. The heat sink is attached to the PCB board. The radio frequency output port is connected to the outer ring flange of the coupler body.
2. The radio frequency input coupler according to claim 1, wherein: A cooling pipe is provided inside the cavity. A cooling pipe inlet and a cooling pipe outlet are provided on the coupler body. Cooling components are provided inside the radio frequency input port and the radio frequency output port. The cooling components are cooling cavities.
3. The radio frequency input coupler according to claim 1, wherein: The radio frequency input port is an N-type radio frequency input port, and the output port is an isolated output microstrip port.
4. The radio frequency input coupler according to claim 1, wherein: At least two ground vias are provided on the PCB board.
5. The radio frequency input coupler according to claim 1, wherein: A second insulator is provided inside the two coupling ports. A conductor is provided inside the second insulator. The conductor is supported and fixed in the coupling port by the second insulator.
6. The radio frequency input coupler according to claim 1, wherein: A sealing gasket is provided between the two coupling ports and the coupler body. The coupling ports are fixedly connected to the coupler body.
7. The radio frequency input coupler according to claim 1, wherein: The coupling line of the PCB board is set to a non-linear structure, and the other coupling line is a linear structure to increase the length of the coupling line.
8. The radio frequency input coupler according to claim 1, wherein: A connecting piece is arranged between the PCB board and the first insulator.
9. The radio frequency input coupler according to claim 1, wherein: The size of the PCB board is the same as that of the heat sink.
10. The radio frequency input coupler according to claim 1, wherein: Both the first insulator and the second insulator are ceramic materials.