Radio frequency switch matrix module

Abstract

The utility model relates to the technical field of radio frequency communication, in particular to a radio frequency switch matrix module, which comprises a reference circuit, a transceiving circuit, a control circuit, a power supply circuit and other circuits which are independently divided into cavities, and adopts a mode of separately laying radio frequency signals, low-frequency signal lines, power lines and the like to reduce the interference of the radio frequency signals on low-frequency control signals. On the layout of the printed board, when a control signal line must pass through a radio frequency signal, the electromagnetic interference of the radio frequency signal on the control signal line is reduced by adopting a laying mode of forming a right angle in relative positions. In the whole structural layout, the modules with high-frequency signals are far away from the low-frequency signal modules as far as possible so as to reduce crosstalk between the modules. The multi-channel multi-frequency L-band combiner has the advantages that the multi-channel multi-frequency L-band combiner is simple in structure and small in size, functions of transmitting and receiving six-out-of-two in L-band, transmitting and receiving L-frequency and combining 100MHz clock reference signals are realized, a PECL level signal or an RS422 communication interface is adopted for channel selection and control, and requirements of practical application are met.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency communication technology, and in particular to a radio frequency switch matrix module. Background Technology

[0002] Radio frequency switch matrix modules play an important role in modern communication systems and are widely used in terrestrial radio frequency equipment, aviation radio frequency equipment and other fields.

[0003] However, the RF switch matrix modules currently available on the market have some shortcomings. First, these modules are relatively large, making them difficult to meet the needs of some space-constrained applications. Second, their frequency range and functional specifications are also limited, failing to fully meet specific technical requirements. For example, existing RF switch matrix modules are often not well-suited for applications requiring L-band transmit / receive 6-to-2 selection, L-frequency transmit / receive, and 100MHz clock reference signal combining.

[0004] Therefore, it is necessary to develop a small-sized radio frequency switch matrix module that can meet the above functional requirements in order to overcome the shortcomings of existing technologies and meet the needs of practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a radio frequency switch matrix module that solves the problems of existing switch matrix modules being large in size, having a limited frequency range, and having functional specifications that are not suitable for specific technical requirements.

[0006] To achieve the above objectives, this utility model provides a radio frequency switch matrix module, including a reference circuit, a transceiver circuit, a control circuit, and a power supply circuit. The reference circuit is connected to the transceiver circuit, the control circuit is connected to both the transceiver circuit and the reference circuit, and the power supply circuit is connected to the reference circuit, the transceiver circuit, and the control circuit.

[0007] The reference circuit includes a first attenuator, a duplexer, a power divider, a first filter, and a first amplifier. The first attenuator is connected to the first amplifier, the first amplifier is connected to the first filter, the first filter is connected to the power divider, and the power divider is connected to six duplexers. The RF switch matrix module also includes a second filter, a first switch, a second switch, and a third switch. Each duplexer is connected to a second filter, each second filter is connected to a first switch, the output of each first switch is connected to six second switches, and each second switch is connected to two third switches.

[0008] The transceiver circuit includes a first 6-to-1 switch, a second amplifier, a coupler, a detector, an analog-to-digital converter, a first digitally controlled attenuator, a third amplifier, a second digitally controlled attenuator, a fourth amplifier, and a third filter. The six third switches are connected to one of the first 6-to-1 switches. Each of the first 6-to-1 switches is connected to a second amplifier. Each second amplifier is connected to a coupler. The coupler is connected to both the first digitally controlled attenuator and the detector. The detector is connected to the analog-to-digital converter. The third amplifier is connected to both the first and second digitally controlled attenuators. The second digitally controlled attenuator is connected to the fourth amplifier. The fourth amplifier is connected to the third filter.

[0009] The transceiver circuit further includes a second 6-to-1 switch, a fourth filter, a fifth amplifier, a second attenuator, a fourth switch, and a fifth switch. The input terminal of each first switch is connected to six of the fourth switches, each of the fourth switches is connected to two of the fifth switches, the six fifth switches are connected to one second 6-to-1 switch, each of the second 6-to-1 switches is connected to the fourth filter, the fourth filter is connected to the fifth amplifier, and the fifth amplifier is connected to the second attenuator.

[0010] The control circuit includes an FPGA, a temperature sensor, and an external interface. The FPGA is connected to the analog-to-digital converter, and is also connected to the first and second numerically controlled attenuators. The temperature sensor is connected to the FPGA, and the external interface is connected to the FPGA.

[0011] This utility model discloses an RF switch matrix module, in which the reference circuit, transceiver circuit, control circuit, and power supply circuit are each housed in separate compartments. RF signal lines are laid separately from low-frequency signal lines and power lines to reduce interference from RF signals to low-frequency control signals. In the printed circuit board layout, when control signal lines must pass alongside RF signal lines, they are laid at right angles to reduce electromagnetic interference from RF signals to control signal lines. Throughout the overall structure, modules with high-frequency signals are kept as far apart as possible from low-frequency signal modules to minimize crosstalk. It is compact in size and achieves 6-to-2 transmit and 6-to-2 receive functionality in the L-band, as well as L-frequency transmit and receive and 100MHz clock reference signal combining. Channel selection and control utilize PECL level signals or an RS422 communication interface, meeting the needs of practical applications. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a block diagram of the radio frequency switch matrix module of this utility model.

[0014] Figure 2 This is a reference circuit block diagram of this utility model.

[0015] Figure 3 This is a block diagram of the AGC circuit principle of this utility model.

[0016] Figure 4 This is a block diagram of the control circuit principle of this utility model.

[0017] Figure 5 This is a block diagram illustrating the power supply implementation principle of this utility model.

[0018] Figure 6 This is the circuit schematic of the power filter of this utility model.

[0019] In the diagram: 1-Reference circuit, 2-Transceiver circuit, 3-Control circuit, 4-Power supply circuit, 5-First attenuator, 6-Duplexer, 7-Power divider, 8-First filter, 9-First amplifier, 10-Second filter, 11-First switch, 12-Second switch, 13-Third switch, 14-First 6-to-1 switch, 15-Second amplifier, 16-Coupled, 17-Detector, 18-Analog-to-digital converter, 19-First digitally controlled attenuator, 20-Third amplifier, 21-Second digitally controlled attenuator, 22-Fourth amplifier, 23-Third filter, 24-Second 6-to-1 switch, 25-Fourth filter, 26-Fifth amplifier, 27-Second attenuator, 28-Fourth switch, 29-Fifth switch, 30-FPGA, 31-Temperature sensor, 32-External interface. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0021] Please see Figures 1 to 6 ,in, Figure 1 This is a block diagram of the radio frequency switch matrix module of this utility model. Figure 2 This is a reference circuit block diagram of this utility model. Figure 3 This is a block diagram of the AGC circuit principle of this utility model. Figure 4 This is a block diagram of the control circuit principle of this utility model. Figure 5 This is a block diagram illustrating the power supply implementation principle of this utility model. Figure 6 This is the circuit schematic of the power filter of this utility model.

[0022] This utility model provides a radio frequency switch matrix module, including a reference circuit 1, a transceiver circuit 2, a control circuit 3, a power supply circuit 4, a second filter 10, a first switch 11, a second switch 12, and a third switch 13. The reference circuit 1 includes a first attenuator 5, a duplexer 6, a power divider 7, a first filter 8, and a first amplifier 9. The transceiver circuit 2 includes a first six-to-one switch 14, a second amplifier 15, a coupler 16, a detector 17, an analog-to-digital converter 18, a first digitally controlled attenuator 19, a third amplifier 20, a second digitally controlled attenuator 21, a fourth amplifier 22, a third filter 23, a second six-to-one switch 24, a fourth filter 25, a fifth amplifier 26, a second attenuator 27, a fourth switch 28, and a fifth switch 29. The control circuit 3 includes an FPGA 30, a temperature sensor 31, and an external interface 32.

[0023] In this specific embodiment, the reference circuit 1 is connected to the transceiver circuit 2, the control circuit 3 is connected to both the transceiver circuit 2 and the reference circuit 1, and the power supply circuit 4 is connected to the reference circuit 1, the transceiver circuit 2, and the control circuit 3.

[0024] The first attenuator 5 is connected to the first amplifier 9, the first amplifier 9 is connected to the first filter 8, the first filter 8 is connected to the power divider 7, and the power divider 7 is connected to each of the six duplexers 6.

[0025] Secondly, each of the duplexers 6 is connected to the second filter 10, each of the second filters 10 is connected to the first switch 11, the output of each of the first switches 11 is connected to six second switches 12, and each of the second switches 12 is connected to two third switches 13.

[0026] Simultaneously, the six third switches 13 are connected to one first six-to-one switch 14, each first six-to-one switch 14 is connected to a second amplifier 15, each second amplifier 15 is connected to a coupler 16, the coupler 16 is connected to the first digitally controlled attenuator 19 and the detector 17, the detector 17 is connected to the analog-to-digital converter 18, the third amplifier 20 is connected to the first digitally controlled attenuator 19 and the second digitally controlled attenuator 21, the second digitally controlled attenuator 21 is connected to the fourth amplifier 22, and the fourth amplifier 22 is connected to the third filter 23.

[0027] In addition, each of the first switches 11 is connected to six of the fourth switches 28, each of the fourth switches 28 is connected to two of the fifth switches 29, the six fifth switches 29 are connected to one of the second six-to-one switches 24, each of the second six-to-one switches 24 is connected to the fourth filter 25, the fourth filter 25 is connected to the fifth amplifier 26, and the fifth amplifier 26 is connected to the second attenuator 27.

[0028] Finally, the FPGA30 is connected to the analog-to-digital converter 18, the FPGA30 is connected to the first numerically controlled attenuator 19 and the second numerically controlled attenuator 21 respectively, the temperature sensor 31 is connected to the FPGA30, and the external interface 32 is connected to the FPGA30.

[0029] Using a radio frequency switch matrix module in this embodiment, the module is divided into four functional circuits: a reference circuit 1, a transceiver circuit 2, a control circuit 3, and a power supply circuit 4. It mainly implements a 6-to-2 transmit and 6-to-2 receive function in the L-band; it also implements the combining function for L-frequency transmission and reception, as well as a 100MHz clock reference signal; the signal combining terminal has 6 input / output channels, and the transceiver terminal has 2 input / output channels each, as shown below. Figure 1 As shown.

[0030] The reference circuit 1 mainly consists of a duplexer 6, a power divider 7, a filter, and an amplifier. The block diagram of the reference circuit 1 is shown below. Figure 2 As shown.

[0031] The analog-to-digital converter 18 (ADC) primarily acquires the voltage value after 1200MHz detection, which is then processed by the FPGA 30 (Field-Programmable Logic Array) to control the attenuation value of the attenuator, thus implementing the AGC (Automatic Gain Control) function. The ADC used is the AD9629BCPZ-80, with 12 effective bits and an 80MHz sampling clock. It sends data to the FPGA 30 via a parallel port. Figure 3 As shown, the AGC circuit mainly consists of coupler 16, digitally controlled attenuator, amplifier, ADC, detector 17, and FPGA 30.

[0032] The control circuit 3 mainly realizes functions such as data conversion from the external interface 32, control of the digitally controlled attenuator, control of the switch, acquisition of ADC voltage, and acquisition of temperature.

[0033] The switch matrix module is powered by +5.5V. The +5.5V supply provides power to the FPGA30, receive channel, transmit channel, and clock channel via an LDO. The power supply block diagram based on the circuit implementation scheme is as follows: Figure 5 As shown.

[0034] Based on the output current requirements, each power converter is designed with a margin of 10% to 20%, and is equipped with short-circuit power protection and reverse connection protection.

[0035] To reduce the DC impedance of the input inductor and meet the maximum input current requirement, a common-mode inductor of 3A or higher is selected. The power supply filter is a low-pass filter circuit composed of inductors and capacitors; the principle is described in [link to relevant documentation]. Figure 6 .

[0036] This design employs a multi-stage filtering approach. It allows DC current to pass through while significantly attenuating high-frequency interference signals. Since interference signals include both differential-mode and common-mode interference, the power supply filter circuit must attenuate both types. The line-to-line capacitors (CX1-CX3), referred to as X capacitors, filter out differential-mode interference signals, while the line-to-ground capacitors (CY1-CY6), referred to as Y capacitors, filter out common-mode interference signals. The inductors used are common-mode coils with the same number of turns but opposite winding directions. After being connected to the filter circuit, the magnetic flux generated by the current in the coil cancels each other out within the magnetic ring, thus maintaining a constant inductance value. The common-mode coils and line-to-line capacitors also form independent low-pass filter circuits to suppress both common-mode and differential-mode interference signals, thereby suppressing EMI signals and meeting the electromagnetic compatibility requirements of the entire system.

[0037] Each functional module of the switch matrix module is both an interference source and a sensitive element. Structurally, a compartmentalized design isolates power control from radio frequency signals, with a separate cover plate ensuring structural isolation. Structural components undergo natural-color conductive oxidation treatment, and the internal modules and printed circuit board mounting achieve good grounding, effectively suppressing external radiation and improving its anti-interference capability.

[0038] The switch matrix module consists of separate chambers for the reference circuit 1, the transceiver circuit 2, the control circuit 3, and the power supply circuit 4. Radio frequency (RF) signals are laid out separately from low-frequency signal lines and power lines to reduce interference from RF signals to low-frequency control signals. In the printed circuit board layout, when control signal lines must pass alongside RF signals, they are laid out at right angles to reduce electromagnetic interference from RF signals to control signal lines. Throughout the overall structure, modules with high-frequency signals are kept as far apart as possible from low-frequency signal modules to minimize crosstalk. It is compact in size and implements L-band transmit / receive 6-to-2 and L-band transmit / receive functions, as well as combining of the 100MHz clock reference signal. Channel selection and control utilize PECL level signals or an RS422 communication interface, meeting the needs of practical applications.

[0039] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A radio frequency switch matrix module, characterized in that, comprising reference circuit, transceiver circuit, control circuit and power supply circuit, the reference circuit is connected with the transceiver circuit, the control circuit is connected with the transceiver circuit and the reference circuit respectively, the power supply circuit is connected with the reference circuit, the transceiver circuit and the control circuit respectively.

2. The radio frequency switch matrix module of claim 1, characterized in that, the reference circuit comprises a first attenuator, a duplexer, a power divider, a first filter and a first amplifier, the first attenuator is connected with the first amplifier, the first amplifier is connected with the first filter, the first filter is connected with the power divider, and the power divider is connected with six duplexers respectively.

3. The radio frequency switch matrix module of claim 2, characterized in that, the radio frequency switch matrix module further comprises a second filter, a first switch, a second switch and a third switch, each of the duplexer is connected with the second filter, each of the second filter is connected with the first switch, the output end of each of the first switch is connected with six second switches, and each of the second switch is connected with two third switches.

4. The radio frequency switch matrix module of claim 3, characterized in that, the transceiver circuit comprises a first six-to-one switch, a second amplifier, a coupler, a detector, an analog-to-digital converter, a first digital attenuator, a third amplifier, a second digital attenuator, a fourth amplifier and a third filter, six third switches are connected with a first six-to-one switch, each of the first six-to-one switch is connected with the second amplifier, each of the second amplifier is connected with the coupler, the coupler is connected with the first digital attenuator and the detector respectively, the detector is connected with the analog-to-digital converter, the third amplifier is connected with the first digital attenuator and the second digital attenuator respectively, the second digital attenuator is connected with the fourth amplifier, and the fourth amplifier is connected with the third filter.

5. The radio frequency switch matrix module of claim 4, characterized in that, the transceiver circuit further comprises a second six-to-one switch, a fourth filter, a fifth amplifier, a second attenuator, a fourth switch and a fifth switch, the input end of each of the first switch is connected with six fourth switches respectively, each of the fourth switch is connected with two fifth switches respectively, six fifth switches are connected with a second six-to-one switch, each of the second six-to-one switch is connected with the fourth filter, the fourth filter is connected with the fifth amplifier, and the fifth amplifier is connected with the second attenuator.

6. The radio frequency switch matrix module of claim 5, characterized in that, the control circuit comprises an FPGA, a temperature sensor and an external interface, the FPGA is connected with the analog-to-digital converter, the FPGA is connected with the first digital attenuator and the second digital attenuator respectively, the temperature sensor is connected with the FPGA, and the external interface is connected with the FPGA.

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