A low-loss power division, coupling, filter integrated device
By integrating a suspended stripline power divider, a microstrip directional coupler, and a suspended stripline filter into a PCB board structure, the problems of large size, high loss, and poor consistency caused by inter-module connections in phased array radar systems are solved. This achieves a low-loss, high-consistency integrated design, reducing costs and failure risks.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI LINGZHIYU TECH CO LTD
- Filing Date
- 2025-10-23
- Publication Date
- 2026-07-24
Smart Images
Figure CN224554682U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of phased array radar technology, specifically to a low-loss power divider, coupling, and filter integrated device. Background Technology
[0002] In phased array radar systems, power dividers, couplers, and filters are three indispensable key passive components. Power dividers are responsible for distributing the power of one input signal to multiple antenna elements; directional couplers are used to sample the main signal, typically serving monitoring or calibration functions; and filters are used to suppress interference signals outside the operating frequency band, ensuring the system's signal-to-noise ratio.
[0003] Currently, in traditional design schemes, power dividers, couplers, and filters are typically designed and manufactured as independent modules. Each independent module has its own physical casing, internal circuitry, and RF connection interfaces (such as SMA, N-type connectors, etc.). In practical applications, these discrete modules need to be cascaded together via RF cables and connectors to form a complete signal processing link.
[0004] In practical applications, the use of discrete passive components has the following drawbacks: 1. The metal casing of each module, connectors, and interconnecting cables significantly increase the overall size and weight of the system, making it difficult to meet the urgent needs of modern electronic devices for miniaturization and lightweighting.
[0005] 2. Each RF connection interface between modules introduces additional insertion loss. In complex multi-level cascaded power supply networks, the cumulative effect of these losses is particularly severe, directly reducing the system's efficiency and dynamic range.
[0006] 3. Repeated assembly and connection, as well as long interconnection paths, can introduce uncontrollable distributed parameters, leading to a deterioration in amplitude and phase consistency between channels, which affects the beam pointing accuracy and sidelobe level of the phased array radar.
[0007] 4. Independent material costs, multiple assembly processes, and a large number of connectors collectively increase the system's material and labor costs.
[0008] Although those skilled in the art have been seeking improvements, such as using cavity filters to reduce losses or trying various miniaturized filter structures, it is often difficult to achieve a good balance between multiple goals such as low loss, miniaturization, high consistency and low cost, and they often fall into the dilemma of sacrificing one thing for another. Utility Model Content
[0009] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a low-loss power divider, coupler, and filter integrated device to solve the problems of large overall size, heavy weight, high insertion loss, poor amplitude and phase consistency, high production cost, and low reliability caused by the power divider, coupler, and filter being assembled as independent modules through external connectors in the prior art.
[0010] To achieve the above and other related objectives, this utility model provides a low-loss power divider, coupler, and filter integrated device, including a main body and a cover plate fitted on the upper end of the main body. The main body integrates a suspended stripline power divider, a microstrip directional coupler, and a suspended stripline CMRC low-pass filter. The suspended stripline power divider uses a PCB board to support the stripline structure. A microstrip directional coupler is connected to the middle area of the PCB board to support the stripline structure, and a suspended stripline CMRC low-pass filter is installed in the area near the end of the PCB board to support the stripline structure. The front end of the main body is provided with an electrical input interface, which is electrically connected to a microstrip directional coupler; the side end of the main body is provided with an electrical output interface, which is electrically connected to the end of the PCB board supporting the strip structure.
[0011] In one embodiment of the present invention, the main body is provided with a lower air cavity, the cover plate is provided with an upper air cavity, the PCB board supporting strip structure includes a dielectric board and suspended copper strips laid on the dielectric board, the edge of the dielectric board is pressed between the main body and the cover plate, and the copper strips are disposed between the upper air cavity and the lower air cavity.
[0012] In one embodiment of the present invention, the microstrip directional coupler includes a microstrip PCB board and fixing screws. The lower end of the microstrip PCB board is entirely copper-plated and grounded, and the upper end of the microstrip PCB board is covered with microstrip lines. The edge of the microstrip PCB board is fixed to the main body by fixing screws.
[0013] In one embodiment of the present invention, a thin-film resistor is welded to the end of the microstrip line, and the other end of the thin-film resistor is grounded; the coupling portion of the microstrip line adopts a 1 / 4 wavelength impedance matching segment and includes a sawtooth structure.
[0014] In one embodiment of the present invention, the suspended stripline CMRC low-pass filter includes a suspended stripline input end and an output end, wherein both the suspended stripline input end and the output end of the suspended stripline CMRC low-pass filter are of the same width as the copper stripline supporting the stripline structure on the PCB board.
[0015] In one embodiment of this utility model, an isolation resistor is welded to the power distribution node of the suspended stripline power divider.
[0016] In one embodiment of this utility model, the electrical input interface adopts a universal SMA connector and feeds signals through a microstrip line, and the electrical output interface outputs signals using a coaxial feed pin.
[0017] As described above, the low-loss power divider, coupling, and filter integrated device of this invention has the following beneficial effects: 1. By setting up a PCB board to support the stripline structure, this utility model can innovatively integrate the functional circuits of the microstrip directional coupler, the suspended stripline power divider, and the suspended stripline filter between the main body and the cover plate, forming a compact integrated module. This completely eliminates the need for external connectors and cables between modules, achieving a high degree of structural integration, significantly reducing the size and weight of the device, and realizing a high degree of integration and miniaturization design of the device.
[0018] 2. The core components of the suspended stripline power divider and the suspended stripline CMRC low-pass filter of this utility model both adopt a suspended stripline structure. This structure uses upper and lower air cavities to surround the stripline, forming a transmission environment with low-loss air as the main medium, thereby greatly reducing signal transmission loss.
[0019] 3. This utility model optimizes the coupling structure by designing the microstrip directional coupler with a microstrip line, using a 1 / 4 wavelength impedance matching section, and incorporating a sawtooth structure, thus ensuring the stability and high directionality of the product's coupling. The integrated solution of this utility model integrates the functional circuits of key passive components in the phased array radar system and enables one-time assembly, avoiding random errors introduced by multiple interconnections of discrete modules, and ensuring that each output channel has excellent and stable amplitude and phase consistency.
[0020] 4. This utility model uses the mechanical structure of the main body and the cover plate to press and fix the PCB board, and uses the upper and lower air cavities to provide a stable and symmetrical electromagnetic environment for the suspended strip line; the microstrip directional coupler is firmly installed on the main body by fixing screws, which enhances the mechanical stability of the overall structure; the integrated device adopted by this utility model reduces a large number of external connectors, fundamentally reducing the risk of failure caused by loose connections and improving the long-term reliability of the device. Attached Figure Description
[0021] Figure 1 The diagram shown is an exploded view of the present invention.
[0022] Figure 2 The diagram shown is a cross-sectional view of the present invention.
[0023] Component designation explanation 1. Cover plate; 2. Suspended stripline CMRC low-pass filter; 3. Suspended stripline power divider; 4. Microstrip directional coupler; 5. Electrical output interface; 6. Main body; 7. Electrical input interface; 8. Transition structure; 9. Lower air cavity; 10. Upper air cavity; 11. PCB board supporting stripline structure; 12. Microstrip PCB board; 13. Fixing screws. Detailed Implementation
[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.
[0025] Please see Figures 1 to 2 It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should fall within the scope of the technical content disclosed in this utility model.
[0026] Please see Figures 1-2 This utility model provides a low-loss power divider, coupler, and filter integrated device, including a main body 6 and a cover plate 1 fitted on the upper end of the main body 6. The main body 6 has a lower air cavity 9, and the cover plate 1 has an upper air cavity 10. The main body 6 integrates a suspended stripline power divider 3, a microstrip directional coupler 4, and a suspended stripline CMRC low-pass filter 2. The front end of the main body 6 has an electrical input interface 7, which is electrically connected to the microstrip directional coupler 4. The electrical input interface 7 adopts a universal SMA connector and feeds in signals through a microstrip line. The main body 6 has an electrical output interface 5 on its side. The suspended stripline power divider 3 uses a PCB board to support the stripline structure 11. The electrical output interface 5 is electrically connected to the end of the PCB board to support the stripline structure 11. The electrical output interface 5 uses a coaxial feed pin to output signals. By setting the PCB board to support the stripline structure 11, this utility model can innovatively integrate the functional circuits of the microstrip directional coupler 4, the suspended stripline power divider 3, and the suspended stripline filter 2 between the main body 6 and the cover plate 1, forming a compact integrated module. This completely eliminates the need for external connectors and cables between modules, achieving a high degree of structural integration, significantly reducing the size and weight of the device, and realizing a high degree of integration and miniaturization design of the device.
[0027] The power distribution node of the suspended stripline power divider 3 is welded with an isolation resistor. The PCB board supporting the stripline structure 11 includes a dielectric board and suspended copper strips laid on the dielectric board. The edge of the dielectric board is pressed between the main body 6 and the cover plate 1, and the copper strips are located between the upper air cavity 10 and the lower air cavity 9. The suspended stripline CMRC low-pass filter 2 is installed in the area near the end of the PCB board supporting the stripline structure 11. Specifically, the suspended stripline CMRC low-pass filter 2 includes a suspended stripline, which uses a CMRC slow-wave structure for filtering. The input and output ends of the suspended stripline of the suspended stripline CMRC low-pass filter 2 are both the same width as the copper strips of the PCB board supporting the stripline structure 11. The core parts of the suspended stripline power divider 3 and the suspended stripline CMRC low-pass filter 2 both adopt a suspended stripline structure. This structure uses upper and lower air cavities to surround the stripline, forming a transmission environment with low-loss air as the main medium, thereby greatly reducing signal transmission loss.
[0028] The microstrip directional coupler 4 is connected to the middle region of the PCB board supporting the stripline structure 11. Specifically, the microstrip directional coupler 4 includes a microstrip PCB board 12 and fixing screws 13. The microstrip PCB board 12 is connected to the dielectric board of the PCB board supporting the stripline structure 11. The lower end of the microstrip PCB board 12 is entirely copper-plated and grounded, and the upper end of the microstrip PCB board 12 is covered with microstrip lines. The microstrip lines are constructed using multi-section impedance matching, and a thin-film resistor is soldered to the end of the microstrip line. The other end of the thin-film resistor is grounded. The coupling section of the microstrip line uses a 1 / 4 wavelength impedance matching segment and includes a sawtooth structure. The edge of the microstrip PCB board 12 is fixed to the main body 6 by fixing screws 13. This invention optimizes the coupling structure by designing the microstrip directional coupler 4 with a microstrip line, employing a 1 / 4 wavelength impedance matching section, and incorporating a sawtooth structure, thus ensuring the stability and high directionality of the product's coupling. The integrated solution of this invention integrates the functional circuits of key passive components in the phased array radar system, enabling one-time assembly and avoiding random errors introduced by multiple interconnections of discrete modules. This ensures that each output channel has excellent and stable amplitude and phase consistency.
[0029] This invention uses the mechanical structure of the main body 6 and the cover plate 1 to press and fix the PCB board, and utilizes the upper and lower air cavities to provide a stable and symmetrical electromagnetic environment for the suspended stripline. The upper air cavity 10, the lower air cavity 9, the PCB board supporting stripline structure 11, and the microstrip PCB board 12 are sequentially combined to form the transition structure 8 for the connection between the suspended stripline and the microstrip line. This transition structure 8 achieves impedance matching and seamless signal transmission between the suspended stripline environment and the microstrip line environment through mechanical pressing and electromagnetic field coupling design, thereby ensuring the high-frequency performance stability and low insertion loss of the entire integrated device. The microstrip directional coupler 4 is firmly installed on the main body 6 by fixing screws 13, which enhances the mechanical stability of the overall structure. The integrated device adopted by this invention reduces a large number of external connectors, fundamentally reducing the risk of failure caused by loose connections and improving the long-term reliability of the device.
[0030] In summary, this invention transforms the complex three-dimensional interconnection problem into a two-dimensional PCB circuit design problem. All functions are implemented using standard PCB processes and can be completed in a single assembly. This greatly simplifies the production process, saves on the cost of connectors, cables, and other materials, as well as assembly time, resulting in excellent economic efficiency and facilitating mass production and market application. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.
[0031] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A low-loss power divider, coupling, and filter integrated device, characterized in that: Includes a main body (6) and a cover plate (1) fitted on the upper end of the main body (6). The main body (6) integrates a suspended stripline power divider (3), a microstrip directional coupler (4), and a suspended stripline CMRC low-pass filter (2). The suspended stripline power divider (3) uses a PCB board to support the stripline structure (11), the microstrip directional coupler (4) is connected to the middle area of the PCB board to support the stripline structure (11), and the suspended stripline CMRC low-pass filter (2) is installed in the area near the end of the PCB board to support the stripline structure (11). The front end of the main body (6) is provided with an electrical input interface (7), which is electrically connected to the microstrip directional coupler (4); the side end of the main body (6) is provided with an electrical output interface (5), which is electrically connected to the end of the PCB board supporting strip structure (11).
2. The low-loss power divider, coupling, and filter integrated device according to claim 1, characterized in that: The main body (6) is provided with a lower air cavity (9), and the cover plate (1) is provided with an upper air cavity (10). The PCB board supporting strip structure (11) includes a dielectric board and a suspended copper strip laid on the dielectric board. The edge of the dielectric board is pressed between the main body (6) and the cover plate (1), and the copper strip is located between the upper air cavity (10) and the lower air cavity (9).
3. The low-loss power divider, coupling, and filter integrated device according to claim 2, characterized in that: The microstrip directional coupler (4) includes a microstrip PCB board (12) and fixing screws (13). The lower end of the microstrip PCB board (12) is entirely copper-plated and grounded. The upper end of the microstrip PCB board (12) is covered with microstrip lines. The edge of the microstrip PCB board (12) is fixed to the main body (6) by fixing screws (13).
4. The low-loss power divider, coupling, and filter integrated device according to claim 3, characterized in that: A thin-film resistor is welded to the end of the microstrip line, and the other end of the thin-film resistor is grounded; the coupling part of the microstrip line adopts a 1 / 4 wavelength impedance matching section and includes a sawtooth structure.
5. The low-loss power divider, coupling, and filter integrated device according to claim 1, characterized in that: The suspended stripline CMRC low-pass filter (2) includes a suspended stripline input end and an output end. The suspended stripline input end and the output end of the suspended stripline CMRC low-pass filter (2) are both the same width as the copper stripline of the PCB board supporting the stripline structure (11).
6. The low-loss power divider, coupling, and filter integrated device according to claim 1, characterized in that: An isolation resistor is welded at the power distribution node of the suspended stripline power divider (3).
7. The low-loss power divider, coupling, and filter integrated device according to claim 1, characterized in that: The electrical input interface (7) uses a universal SMA connector and feeds signals through a microstrip line, while the electrical output interface (5) uses a coaxial feed pin to output signals.