Design method of 0.7~2ghz linkage control dual-path output switch filter assembly

Abstract

The application discloses a design method of a 0.7-2GHz linkage control double-way output switch filter assembly, and the difficulty of the application is that based on the simulation of a schematic circuit, three-dimensional electromagnetic field simulation modeling is carried out on the box body, the blocking strip and the PCB (Printed Circuit Board) of the switch filter assembly, more accurate electric field energy, magnetic field energy and S parameter simulation results are obtained, and the simulation difficulty is great because of the system level modeling simulation requirement of the active device, the passive device and the PCB S parameter of the radio frequency circuit, the active device, the passive device and the PCB S parameter of the switch filter assembly are accurately simulated and modeled based on the three-dimensional electromagnetic field simulation and the schematic circuit simulation, so that the switch filter assembly of the 0.7-2GHz linkage control double-way output is accurately analyzed before the physical object is processed, and the application has a guiding role in the design of a radar receiver.

Description

Technical Field

[0001] This invention belongs to the field of radar receiver integrated circuits, specifically relating to a design method for a 0.7-2GHz linkage control dual-output switching filter component. Background Technology

[0002] Switching filter components can amplify, divide, attenuate, select, and filter weak radar signals received from the antenna in the 0.7–2 GHz range, and output radio frequency signals that meet the requirements. They are widely used in satellite communications and radar.

[0003] Traditional switching filter component design methods rely on experience. They simply calculate the gain index and then start designing and manufacturing the physical object. The components have a single output, limited control and function, and are 12mm or even thicker.

[0004] With the development of radar receivers, multiple antennas receive radar signals, and each radar signal operates at a different frequency band. Due to the high degree of integration, the design size of the 0.7-2GHz linkage control dual-output switching filter component in current radar systems is required to be as small as possible. Therefore, signal crosstalk, signal line crossing, and electromagnetic compatibility issues are more prominent.

[0005] The original design method relied solely on engineering experience to design and then manufacture the physical object. If the physical object test results did not meet the requirements, the equipment would be reworked, wasting manpower, time, and component costs. The designers' work efficiency was low, and they had to work overtime. This was because when designing components, the designers only simulated the schematic diagram and did not perform three-dimensional electromagnetic field simulation modeling of the PCB and structure of the switching and filtering components. Furthermore, they did not perform system-level modeling and simulation of the active and passive components and PCB S-parameters in the RF circuit. Summary of the Invention

[0006] This invention proposes a design method for a 0.7–2 GHz linkage control dual-output switching filter component, which solves the requirements of high reliability, linkage control, high integration and strong versatility for the 0.7–2 GHz linkage control dual-output switching filter component of P / L band frequency conversion channels.

[0007] The technical solution for achieving this invention is: a design method for a 0.7-2GHz linkage control dual-output switching filter component, characterized by the following steps:

[0008] S1: Based on the technical specifications of the 0.7-2GHz linkage control dual-output switch filter component in the radar receiver, formulate a scheme for the 0.7-2GHz linkage control dual-output switch filter component, and proceed to S2.

[0009] S2: Based on the above-mentioned plan and combined with the schematic diagram, obtain the schematic simulation model, and then proceed to S3.

[0010] S3: Based on the simulation results of the schematic diagram of the 0.7-2GHz linkage control dual-output switching filter component, perform PCB design and structural design for the component, then proceed to S4.

[0011] S4: Based on the PCB and structural design of the 0.7-2GHz linkage control dual-output switch filter component, establish a three-dimensional electromagnetic field simulation model, obtain the three-dimensional electromagnetic field simulation results, and proceed to S5.

[0012] S5: Based on the three-dimensional electromagnetic field simulation results of the 0.7~2GHz linkage control dual-output switching filter component, the component is modeled by field-circuit joint simulation to obtain the field-circuit joint simulation results.

[0013] S6: Based on the field-circuit joint simulation results of the 0.7-2GHz linkage control dual-output switch filter component, fabricate a physical prototype of the dual-output switch filter component.

[0014] Compared with the prior art, the significant advantages of this invention are:

[0015] (1) Using multi-layer board and field circuit joint simulation technology, a switching filter component based on MMIC was discovered. The thickness is designed to be 10mm. It can flexibly amplify, divide, attenuate, switch and filter 0.7~2GHz signals and output RF signals that meet the requirements. It meets the various requirements of P / L band frequency conversion channel for RF front end.

[0016] (2) The switching filter component in this invention has a simple structure design, low cost, and strong versatility. The field-circuit joint simulation results are consistent with the actual test results, which can guide the design of radar receivers.

[0017] (3) The present invention can manufacture a switch filter component with a size of 90mm×80mm×10mm and a weight of 173g. The component thickness is designed to be 10mm, so that the thickness of the ASAAC plug-in board is designed to be 24mm instead of the original 28mm, so that the radar receiver microwave subsystem chassis meets the requirements of miniaturization. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the design method of a dual-output switching filter component with linkage control from 0.7 to 2 GHz.

[0019] Figure 2 This is a block diagram of a scheme for a dual-output switching filter component with linkage control from 0.7 to 2 GHz.

[0020] Figure 3This is a schematic diagram of the first-stage π attenuator and the first-stage power divider of the 0.7-2GHz linkage control dual-output switching filter component.

[0021] Figure 4 This is a schematic diagram of a 0.7-2GHz linkage control dual-output switching filter component, a digitally controlled attenuator, and a second-stage power divider.

[0022] Figure 5 This is the schematic diagram of a 0.7-2GHz linkage control dual-output switching filter amplifier and a second-stage π attenuation.

[0023] Figure 6 This is a schematic diagram of the SP3T dual-output switching filter component and filter bank with 0.7-2GHz linkage control.

[0024] Figure 7 This is a schematic diagram of the power supply and control of a 0.7-2GHz linkage control dual-output switching filter component.

[0025] Figure 8 It is a simulation model of the schematic diagram of a dual-output switching filter component with linkage control from 0.7 to 2 GHz.

[0026] Figure 9 This is a PCB diagram of a dual-output switching filter component with linkage control from 0.7 to 2 GHz.

[0027] Figure 10 This is a structural diagram of the housing and pressure bar of the 0.7-2GHz linkage control dual-output switch filter component.

[0028] Figure 11 It is a three-dimensional electromagnetic field simulation model of a dual-output switching filter component with linkage control from 0.7 to 2 GHz.

[0029] Figure 12 It is a field-circuit joint simulation model of a dual-output switching filter component with linkage control from 0.7 to 2 GHz. Detailed Implementation

[0030] To improve work efficiency, this invention discloses a design method for a 0.7–2 GHz linkage control dual-output switching filter component. The challenge of this design method lies in performing three-dimensional electromagnetic field simulation modeling of the switch filter component's housing, baffles, and PCB board based on schematic circuit simulation, to obtain more accurate simulation results for electric field energy, magnetic field energy, and S-parameters. This involves system-level modeling and simulation of active and passive components of the RF circuit and PCB S-parameters, making the simulation difficult. This invention, based on three-dimensional electromagnetic field simulation and schematic circuit simulation, accurately simulates and models the active and passive components of the switch filter component and PCB S-parameters. This allows for precise analysis of the 0.7–2 GHz linkage control dual-output switching filter component before physical fabrication, providing guidance in radar receiver design.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0033] The following section will further introduce the specific implementation method, as well as the technical difficulties and inventive points of this invention, using this design example as an example.

[0034] Combination Figure 1 A design method for a 0.7–2 GHz linkage control dual-output switching filter component, the steps of which are as follows:

[0035] S1: Based on the technical specifications of the 0.7–2 GHz linkage control dual-output switching filter component in the radar receiver, the following block diagram is provided for the 0.7–2 GHz linkage control dual-output switching filter component. Figure 2 As shown.

[0036] The 0.7–2 GHz linkage control dual-output switching filter assembly includes a first-stage π attenuator, a first power divider, a digitally controlled attenuator, a second power divider, two amplification and attenuation circuits, three parallel filter banks, and four single-pole triple-throw switches. The amplification and attenuation circuit includes an amplifier, a second-stage π attenuator I, and a second-stage π attenuator II connected in sequence. After the 0.7–2 GHz signal passes through the first-stage π attenuator and the first-stage power divider, it is split into two paths, referred to as the first path and the second path. The second path signal output undergoes other frequency conversion processing. The first path signal undergoes digitally controlled attenuation and is then split into two paths by the second power divider. The two paths are respectively sent to the two amplification and attenuation circuits for sequential amplification and second-stage π attenuation. After being selected by the single-pole triple-throw switches, they are sent to the corresponding filter banks. After being filtered by the filter banks, they are then selected by the third and fourth single-pole triple-throw switches respectively. Through linkage control and switch selection, three sets of working signals can be output in dual-path mode. When the first channel outputs a 740MHz signal, the second channel outputs an 837.5MHz signal; when the first channel outputs a 1090MHz signal, the second channel outputs a 1030MHz signal; when the first channel outputs a 1532MHz signal, the second channel outputs a 1464MHz signal.

[0037] S2: Design the schematic diagram based on the scheme block diagram, as follows: Figures 3-7 As shown, the schematic simulation model is obtained based on the schematic diagram. Figure 8 As shown.

[0038] Schematic diagram as follows Figures 3-7 As shown, the first-stage π attenuator, the second-stage π attenuator I, and the second-stage π attenuator II all employ 3dB π attenuation, including a first adjustable resistor R1 (RMK1608MB180J, 18 ohms), a second adjustable resistor R2 (RMK1608MB301J, 300 ohms), and a third adjustable resistor R3 (RMK1608MB301J, 300 ohms). The first terminal of the second adjustable resistor R2 is connected to the first terminal of the first adjustable resistor R1, and the second terminal is grounded; the first terminal of the third adjustable resistor R3 is connected to the second terminal of the first adjustable resistor R1, and the second terminal is grounded. Both the first and second power dividers use the GP2S1+ from MINI Corporation (USA); the amplifier uses the TQP3M9028 from TriQuint Corporation (USA); and the digitally controlled attenuator uses the BW150SM4M from the 13th Research Institute of China Electronics Technology Group Corporation (CETC).

[0039] All four single-pole triple-throw switches are BW1027DPQ4 from the 13th Research Institute of China Electronics Technology Group Corporation (CETC). This reflective gallium arsenide (GaAs) single-pole triple-throw switch operates at frequencies ranging from 0.1 to 18 GHz. The control voltages for the single-pole triple-throw switches are shown in Table 1. When the control voltage is 0 to +0.2V, the control bit indicates low; when the control voltage is +3.3 to +5.5V, the control bit indicates high. The three filter banks are model numbers 2YMRB740 / 1090-8 / 24, 2YMRB837.5 / 1532-8-4C, and 2YMRB1030 / 1464-24 / 20, respectively.

[0040] Table 1 Control Voltages of Single-Pole Three-Throw Switches

[0041] Low 0～+0.2V high +3.3～+5.5V

[0042] S3: Based on the simulation results of the schematic diagram of the 0.7~2GHz linkage control dual-output switching filter component, design the PCB of the component as follows: Figure 9 As shown, and the structural design as follows Figure 10 As shown.

[0043] The design employs multilayer board technology, integrating three filter banks using four single-pole triple-throw switches. This unifies the discrete components of the three filter banks into a single design. Furthermore, the channel integrates a π-attenuator, power divider, digitally controlled attenuator, and amplifier, thereby achieving signal attenuation, power division, digitally controlled attenuation, amplification, switch selection, and filtering in the microwave channel. The PCB board material is RO4350B, a four-layer board with a total thickness of 0.8mm, including a 0.035mm copper layer, a 0.254mm thick RO4350B dielectric material, and a 0.152mm thick RO4450F prepreg. The intermediate dielectric material of the transition board for the switch-filter assembly is also RO4350B, with a total thickness of 0.324mm, including a 0.035mm thick copper layer and a 0.254mm thick dielectric material.

[0044] S4: Based on the PCB and structural design of the 0.7~2GHz linkage control dual-output switching filter component, a three-dimensional electromagnetic field simulation model is performed, such as... Figure 11 As shown, the three-dimensional electromagnetic field simulation results are obtained.

[0045] In the three-dimensional electromagnetic field simulation model, a transient solver and a hexahedral meshing method are employed. The innovation lies in the local refinement of the 0.035mm thick copper layer of the 0.7–2GHz linkage control dual-output switch filter component, increasing the number of hexahedral meshes. The simulation model also incorporates the switch filter component's housing structure, thereby achieving accurate three-dimensional electromagnetic field simulation of the switch filter component. Based on schematic circuit simulation, this invention performs three-dimensional electromagnetic field simulation modeling of the housing, baffles, and PCB board of the 0.7–2GHz linkage control dual-output switch filter component, obtaining the S-parameter simulation results for the discrete ports of the PCB.

[0046] S5: Based on the three-dimensional electromagnetic field simulation results of the 0.7~2GHz linkage control dual-output switching filter component, the component is modeled by field-circuit joint simulation to obtain the field-circuit joint simulation results.

[0047] The challenge lies in the system-level modeling and simulation requirements involving active and passive components of the RF circuit, making the simulation difficult. The innovation lies in establishing a system-level simulation model of the active and passive components and PCB S-parameters. Using the method of moments, the active and passive components are connected to discrete ports on the PCB, thus forming a system-level model. Based on three-dimensional electromagnetic field simulation and schematic circuit simulation, this invention performs field-circuit joint simulation modeling of a 0.7–2 GHz linked control dual-output switching filter component, obtaining the field-circuit joint simulation results, namely gain, noise figure, and P. -1 Field-circuit joint simulation curves.

[0048] S6: Based on the field-circuit joint simulation results of the 0.7-2GHz linkage control dual-output switch filter component, fabricate a physical prototype of the dual-output switch filter component.

[0049] The truth table of TTL control for three channels RF1 to RF3 using a single-pole triple-throw switch is shown in Table 2. When designing the PCB of the switch filter component, the VPA and VPB of the single-pole triple-throw switches at the input terminals of the two filters are connected in series, and the VPA and VPB of the single-pole triple-throw switches at the output terminals of the two filters are connected in series, thereby realizing the linkage control of the dual output signals.

[0050] Table 2 Truth Table for TTL Control of Single-Pole Three-Throw Switch

[0051]

[0052]

[0053] The RF input / output connectors use the JSMP(M)-JHD1 RF connectors from Xi'an Elite, ensuring a sealed design for the components. The power-on control connector uses the J30JMI-15ZKS19 rectangular connector from Xi'an Elite; the interface network labels and functions are shown in Table 3. The voltage regulator uses the LT1764EFE to regulate the +6V external power supply to the required +5V.

[0054] Table 3 Interface Network Labels and Functions of Rectangular Connector J30JMI-15ZKS19

[0055] 1 A_CTRL_1A 5dB control position of CNC attenuator 2 A_CTRL_3A 20dB control position of CNC attenuator 3 S1_VPB Filter input single-pole three-throw switch VPB linkage control bit 4 S3_VPA The filter output terminal single-pole three-throw switch VPA linkage control bit 5 AGND Grounding 6 -5V -5V power supply 7 +6V +6V power supply 8 +6V +6V power supply 9 A_CTRL_2A 10dB control position of CNC attenuator 10 S1_VPA Filter input single-pole triple-throw switch VPA linkage control bit 11 S3_VPB The filter output terminal single-pole three-throw switch VPB linkage control bit 12 AGND Grounding 13 AGND Grounding 14 -5V -5V power supply 15 +6V +6V power supply

[0056] The interface network labels and functions of the rectangular connector are shown in the figure. It uses +6V and -5V power. The digitally controlled attenuator uses components from the 13th Research Institute of China Electronics Technology Group Corporation (CETC). The basic attenuation levels are 5dB, 10dB, and 20dB, with a total attenuation of 35dB. The control bits are controlled by serial codes, namely A_CTRL_1A, A_CTRL_2A, and A_CTRL_3A, which control the 5dB, 10dB, and 20dB attenuation control bits of the BW150SM4M digitally controlled attenuator in the RF link, respectively. S1_VPA and S1_VPB represent the linkage control bits of the single-pole triple-throw switch VPA and VPB at the filter input, respectively. S3_VPA and S3_VPB represent the linkage control bits of the single-pole triple-throw switch VPA and VPB at the filter output, respectively. The control code table for the switching filter component is shown in Table 4, where 1 represents a high-order bit and 0 represents a low-order bit.

[0057] Table 4 Control Code Table for Switching Filter Components

[0058] 1 0 1 1 736–744MHz channel selection 0 1 0 1 1078–1102MHz channel selection 1 1 1 0 1528–1536MHz channel selection 1 0 1 1 833.5–841.5MHz channel selection 0 1 0 1 1018–1042MHz channel selection 1 1 1 0 1454–1474MHz channel selection

[0059] The switching filter component in this invention measures 90mm × 80mm × 10mm and weighs 173g. The component's thickness is designed to be 10mm, thereby reducing the ASAAC insert board thickness from the original 28mm to 24mm, enabling the radar receiver microwave subsystem chassis to meet miniaturization requirements.

Claims

1. A design method for a 0.7–2 GHz linkage control dual-output switching filter component, characterized in that, The steps are as follows: S1: Based on the technical specifications of the 0.7-2GHz linkage control dual-output switch filter component in the radar receiver, formulate a scheme for the 0.7-2GHz linkage control dual-output switch filter component, and proceed to S2; S2: Based on the above-mentioned plan and combined with the schematic diagram, obtain the schematic simulation model, and proceed to S3; S3: Based on the simulation results of the schematic diagram of the 0.7~2GHz linkage control dual-output switching filter component, the PCB design and structural design of the component are carried out, as detailed below: The design employs multi-layer board technology to integrate three filter banks using four single-pole triple-throw switches, thereby integrating the discrete components of the three filter banks into a single design. Furthermore, the channel integrates a π attenuator, power divider, digitally controlled attenuator, and amplifier, thus realizing signal attenuation, power division, digitally controlled attenuation, amplification, switch selection, and filtering in the microwave channel. Switch to S4; S4: Based on the PCB and structural design of the 0.7-2GHz linkage control dual-output switch filter component, a three-dimensional electromagnetic field simulation model was established, and the three-dimensional electromagnetic field simulation results were obtained as follows: In the three-dimensional electromagnetic field simulation model, a transient solver and a hexahedral mesh method were used to locally refine the copper layer of the 0.7-2GHz linkage control dual-output switch filter component, increasing the number of hexahedral meshes. The switch filter component box structure was also added to the simulation model, thereby realizing the accurate three-dimensional electromagnetic field simulation of the switch filter component. Based on the schematic circuit simulation, a three-dimensional electromagnetic field simulation model was performed on the housing, baffle, and PCB board of the 0.7-2GHz linkage control dual-output switch filter component, and the S-parameter simulation results of the discrete ports of the PCB were obtained. Switch to S5; S5: Based on the three-dimensional electromagnetic field simulation results of the 0.7~2GHz linkage control dual-output switching filter component, a field-circuit joint simulation model of the component is performed to obtain the field-circuit joint simulation results; the details are as follows: A system-level simulation model is established by using active devices, passive devices, and PCB S-parameters. The active devices, passive devices, and discrete ports on the PCB are then connected using the method of moments to form a system-level model. Based on three-dimensional electromagnetic field simulation and schematic circuit simulation, a field-circuit joint simulation model of a 0.7–2 GHz linkage control dual-output switching filter component was performed to obtain the gain, noise figure, and P. -1 Field-path co-simulation results of the field-path co-simulation curve; S6: Based on the field-circuit joint simulation results of the 0.7-2GHz linkage control dual-output switch filter component, fabricate a physical prototype of the dual-output switch filter component.

2. The design method of the 0.7-2GHz linkage control dual-output switching filter component according to claim 1, characterized in that, In S1, based on the technical specifications of the 0.7–2 GHz linkage control dual-output switching filter component in the radar receiver, a scheme is formulated for the 0.7–2 GHz linkage control dual-output switching filter component, as follows: The 0.7–2 GHz linkage control dual-output switching filter assembly includes a first-stage π attenuator, a first power divider, a digitally controlled attenuator, a second power divider, two amplification and attenuation circuits, three parallel filter banks, and four single-pole triple-throw switches. The amplification and attenuation circuit includes an amplifier, a second-stage π attenuator I, and a second-stage π attenuator II connected in sequence. After passing through the first-stage π attenuator and the first-stage power divider, the 0.7–2 GHz signal is split into two paths, referred to as the first path and the second path. The second path signal output undergoes further frequency conversion processing. The first path signal, after digitally controlled attenuation, is split into two paths by the second power divider, and the two signals are respectively sent to two amplifiers. After amplification and second-stage π attenuation in the attenuation circuit, the signal is selected by a single-pole triple-throw switch and sent to the corresponding filter bank. After filtering by the filter bank, the signal is selected by the third and fourth single-pole triple-throw switches respectively. Through linkage control and switch selection, three sets of working signals are output from dual channels. When the first channel outputs a 740MHz signal, the second channel outputs an 837.5MHz signal; when the first channel outputs a 1090MHz signal, the second channel outputs a 1030MHz signal; when the first channel outputs a 1532MHz signal, the second channel outputs a 1464MHz signal.

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