A Ku / K band up / down conversion method and circuit for phased array antenna extension

Abstract

The present invention discloses a Ku / K-band up / down frequency conversion method and circuit for a phased array antenna extension. The circuit includes a radio frequency input / output module, a primary frequency conversion module, a secondary frequency conversion module, a switch filter module, and an intermediate frequency input / output module. The radio frequency input / output module, the primary frequency conversion module, the secondary frequency conversion module, the switch filter module, and the intermediate frequency input / output module constitute a bidirectional frequency conversion link, enabling the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel, and the K-band transmitting channel to share the same frequency conversion channel. The frequency synthesizer and the point frequency source only need to provide a single local oscillator signal to the two mixers in the link. The present invention significantly reduces the structural complexity of the system. Through a shared frequency conversion channel, the functions and performance of four conventional frequency conversion channels are achieved, while the local oscillator power division network is omitted, thereby achieving the requirements of system integration, miniaturization, lightweighting, and high reliability of the phased array antenna extension.

Description

Technical Field

[0001] The present invention belongs to the technical field of wave communication electronic devices, and in particular relates to a Ku / K band up / down conversion method and circuit for a phased array antenna extension. Background Art

[0002] Phased array radar, or phase-controlled electronically scanned array radar, boasts the ability to rapidly and precisely switch beams, enabling it to complete a full airspace scan within a minute. A phased array radar consists of a large number of identical radiating elements, each independently controlled in phase and amplitude by beam steering and phase shifters, resulting in a precise and predictable radiation pattern and beam pointing. During radar operation, the transmitter distributes power to each antenna element via a feeder network. Energy is radiated by these numerous independent antenna elements and spatially combined to form the desired beam pointing.

[0003] Active phased array radar is a type of phased array radar. Each radiator in an active phased array radar is equipped with a transmitting / receiving component, and each component can independently generate and receive electromagnetic waves. Therefore, it has significant advantages over passive phased array radar in terms of bandwidth, signal processing, and redundancy design.

[0004] The transmit feed of an active phased array antenna consists of a row feed and multiple column feeds. Each column feed is a power distribution network, with multiple output segments connected to the inputs of the power amplifiers in the T / R modules of each antenna column. The output signals from the receiving circuits in the T / R modules are transmitted to the input of the power adder of the receive feeder. After power synthesis, they pass through a downconverter, intermediate frequency amplifier, and A / D converter to be converted into a binary signal, which is then transmitted to the digital row feed beamforming network.

[0005] The phased array antenna extension is the core component of an active phased array radar. Under the control of the terminal extension, it can perform up- and down-conversion of Ku- and K-band communication signals, as well as radiate and receive signals in specific directions. It also monitors the status of various antenna components, detects faults, and reports the status of internal modules. It also offers arbitrarily adjustable 3dB beamwidth. The phased array antenna extension primarily consists of two antenna arrays, a T / R module, a power splitter / combiner network, up- and down-conversion modules, a beam control board, and a power supply module.

[0006] like Figure 4As shown in the figure, conventional up- and down-conversion modules require four independent frequency conversion channels for the Ku-band receive, Ku-band transmit, K-band receive, and K-band transmit functions. Furthermore, each frequency conversion channel requires secondary frequency conversion to convert the L-band intermediate frequency signal. The frequency synthesizer and point frequency source require a complex power splitter network to meet the local oscillator signal requirements of the four frequency conversion channels. Therefore, a novel integration approach is needed to address the phased array antenna extension's requirements for integration, miniaturization, lightweight design, and high reliability. Summary of the Invention

[0007] The purpose of the present invention is to provide a Ku / K band up / down conversion method and circuit for a phased array antenna extension, mainly to solve the problem of complex structure of existing Ku / K band up / down conversion.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A Ku / K band up / down conversion method for a phased array antenna extension comprises the following steps:

[0010] S1, establish a bidirectional frequency conversion link with a Ku-band receiving channel, a Ku-band transmitting channel, a K-band receiving channel, and a K-band transmitting channel;

[0011] S2 uses a frequency synthesizer to provide a single local oscillator signal to the mixer, and realizes the frequency hopping output of the local oscillator signal through the serial port control program, and mixes it with the input RF signal to achieve a single frequency conversion;

[0012] S3 uses a point frequency source to provide a single-channel local oscillator signal with a fixed frequency to the mixer, which is mixed with the primary frequency conversion signal to achieve secondary frequency conversion;

[0013] S4, the secondary frequency conversion signal is controlled by the serial port program and output through the bandpass filter channels of different bandwidths of the switch filter module;

[0014] S5, the output signal of the switch filter module is output through the L-band transceiver circuit to output the L-band intermediate frequency signal to the subsequent digital circuit for A / D sampling processing; thereby completing the spectrum shift of the RF signal with two frequency conversions.

[0015] Furthermore, in step S1, a serial port program is used to control the selection switches of the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel and the K-band transmitting channel.

[0016] Furthermore, in step S4, the switch filter module implements gating of a 1 GHz bandwidth filtering channel, a 500 MHz bandwidth filtering channel or a 200 MHz bandwidth filtering channel through a 1 GHz bandpass filter, a 500 MHz bandpass filter or a 200 MHz bandpass filter.

[0017] Based on the above method, the present invention also provides a Ku / K band up and down frequency conversion circuit for a phased array antenna extension, comprising a radio frequency input and output module, a primary frequency conversion module, a secondary frequency conversion module, a switch filter module and an intermediate frequency input and output module connected in sequence; wherein the radio frequency input and output module, the primary frequency conversion module, the secondary frequency conversion module, the switch filter module and the intermediate frequency input and output module are all bidirectional working modules.

[0018] Furthermore, the RF signal input and output module includes a Ku-band transceiver front end, a K-band transceiver front end and a single-pole double-throw switch; wherein the Ku-band transceiver front end and the K-band transceiver front end are respectively connected to the two fixed ends of the single-pole double-throw switch, and the moving end of the single-pole double-throw switch is connected to the primary frequency conversion module, which is used to realize the selective input and selective output of the Ku-band and K-band RF signals.

[0019] Furthermore, in the present invention, the primary frequency conversion module includes a first mixer, a frequency synthesizer, and a first bidirectional amplifier; wherein, the RF end of the first mixer is connected to the active end of a single-pole double-throw switch, the local oscillator input end of the first mixer is connected to the frequency synthesizer, and the intermediate frequency end of the first mixer is connected to the first bidirectional amplifier; the other end of the first bidirectional amplifier is connected to the secondary frequency conversion module; the primary frequency conversion module is used to realize spectrum shifting between Ku / K band RF signals and X band intermediate frequency signals.

[0020] Furthermore, in the present invention, the secondary frequency conversion module includes a second mixer, a point frequency source, and a second bidirectional amplifier; the radio frequency end of the second mixer is connected to one end of the first bidirectional amplifier; the local oscillator input end of the second mixer is connected to the point frequency source, and the intermediate frequency end of the second mixer is connected to the second bidirectional amplifier; the other end of the second bidirectional amplifier is connected to the switch filter module; the secondary frequency conversion module is used to achieve spectrum shifting of the X-band intermediate frequency signal and the L-band intermediate frequency signal.

[0021] Furthermore, in the present invention, the switch filter module includes a first single-pole triple-throw switch, a second single-pole triple-throw switch, a 1 GHz band-pass filter, a 500 MHz band-pass filter, and a 200 MHz band-pass filter; wherein the moving end of the first single-pole triple-throw switch is connected to one end of the second bidirectional amplifier; the three fixed ends of the first single-pole triple-throw switch are respectively connected to one end of the 1 GHz band-pass filter, the 500 MHz band-pass filter, and the 200 MHz band-pass filter; the other ends of the 1 GHz band-pass filter, the 500 MHz band-pass filter, and the 200 MHz band-pass filter are respectively connected to the three fixed ends of the second single-pole triple-throw switch; and the moving end of the second single-pole triple-throw switch is connected to the intermediate frequency input and output module.

[0022] Furthermore, in the present invention, the intermediate frequency input and output module adopts an L-band transceiver circuit.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The radio frequency link in the present invention is a bidirectional frequency conversion link with the function of time-division multiplexing of the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel, and the K-band transmitting channel, which effectively reduces the structural complexity of the module and has the characteristics of integration and miniaturization.

[0025] (2) The present invention achieves the functions and performance of four conventional frequency conversion channels through a time-division multiplexed, bidirectional frequency conversion link. The frequency synthesizer and point frequency source only need to provide a single local oscillator signal to the two mixers in the link, eliminating the complex local oscillator power splitter network in conventional multi-channel components and effectively simplifying the circuit structure. Spectrum shifting is achieved through secondary frequency conversion, and the primary frequency conversion module uses the X-band signal as the intermediate frequency signal for transition, effectively reducing clutter signals within the useful signal band. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 for Figure 1 Schematic diagram of the partially enlarged structure in .

[0028] Figure 3 for Figure 1 Another part of the enlarged structural diagram.

[0029] Figure 4 This is a conventional design method for Ku / K band up / down conversion modules in the prior art.

[0030] Figure 5 This is a schematic diagram of the working mode of an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and examples. The embodiments of the present invention include but are not limited to the following examples.

[0032] The phased array antenna extension is the core component of an active phased array radar. Under the control of the terminal extension, it can perform up- and down-conversion of Ku- and K-band communication signals, as well as radiate and receive signals in specific directions. It also monitors the status of various antenna components, detects faults, and reports the status of internal modules. It also offers arbitrarily adjustable 3dB beamwidth. The phased array antenna extension primarily consists of two antenna arrays, a T / R module, a power splitter / combiner network, up- and down-conversion modules, a beam control board, and a power supply module.

[0033] The Ku / K-band up / down conversion module of this embodiment is used in the receiving link to convert the Ku / K-band communication signal to an L-band intermediate frequency signal, which is then provided to the subsequent digital circuit for A / D sampling and processing; in the transmitting link, it is used to convert the L-band intermediate frequency signal to a Ku / K-band communication signal, which is then connected to the power amplifier in the T / R component via the power distribution network and finally transmitted to the antenna unit.

[0034] The present invention discloses a Ku / K band up / down conversion method for a phased array antenna extension, comprising the following steps:

[0035] S1, establish a bidirectional frequency conversion link with a Ku-band receiving channel, a Ku-band transmitting channel, a K-band receiving channel, and a K-band transmitting channel; wherein, a serial port program is used to control the selection switches of the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel, and the K-band transmitting channel.

[0036] S2 uses a frequency synthesizer to provide a single local oscillator signal to the mixer, and realizes the frequency hopping output of the local oscillator signal frequency through the serial port control program, and mixes it with the input RF signal to achieve a single frequency conversion.

[0037] S3 uses a point frequency source to provide a single-channel local oscillator signal with a fixed frequency to the mixer, which is mixed with the primary frequency conversion signal to achieve secondary frequency conversion.

[0038] S4, the secondary frequency conversion signal is output through the bandpass filter channels of different bandwidths of the switch filter module after being controlled by the serial port program; wherein, the switch filter module realizes the selection of the 1GHz bandwidth filter channel, the 500MHz bandwidth filter channel or the 200MHz bandwidth filter channel through the 1GHz bandpass filter, the 500MHz bandpass filter and the 200MHz bandpass filter.

[0039] S5, the output signal of the switch filter module is output through the L-band transceiver circuit to output the L-band intermediate frequency signal to the subsequent digital circuit for A / D sampling processing; thereby completing the spectrum shift of the RF signal with two frequency conversions.

[0040] like Figures 1 to 3 As shown, based on the above method, this embodiment also provides a Ku / K band up / down conversion circuit for a phased array antenna extension, including a radio frequency input and output module, a primary frequency conversion module, a secondary frequency conversion module, a switch filter module, and an intermediate frequency input and output module connected in sequence; wherein the radio frequency input and output module, the primary frequency conversion module, the secondary frequency conversion module, the switch filter module, and the intermediate frequency input and output module are all bidirectional working modules.

[0041] The main working mode of the frequency conversion circuit is: the Ku / K band up and down conversion module can select the Ku band receiving mode, Ku band transmitting mode, K band receiving mode, K band transmitting mode and silent mode through the serial port program. Among them, the working directions of Ku band receiving mode, Ku band transmitting mode, K band receiving mode and K band transmitting mode are detailed in Figure 5 .

[0042] The Ku / K-band up and down conversion module opens the Ku-band receiving mode through the serial port program and can select the Ku-band receiving channel. The Ku-band RF signal is input from the RF input and output module, passes through the Ku-band transceiver front end, a fixed end and a moving end of the single-pole double-throw switch in sequence, and is output from the RF input and output module to the primary frequency conversion module. The Ku-band RF signal is input from the RF end of the first mixer of the primary frequency conversion module, and after conversion, the X-band intermediate frequency signal is output from the intermediate frequency end, and is output to the secondary frequency conversion module through the first bidirectional amplifier. During the conversion process, the frequency synthesizer receives the control signal and outputs the corresponding local oscillator signal, which is input to the local oscillator end of the first mixer; the X-band intermediate frequency signal is input from the RF end of the second mixer of the secondary frequency conversion module, and after frequency conversion, the L-band intermediate frequency signal is output from the intermediate frequency end, and is output to the switch filter module through the second bidirectional amplifier. During the conversion process, the point frequency source outputs a fixed local oscillator signal, which is input to the local oscillator end of the second mixer; L-band The IF signal is input from the switch filter module, passes through the moving end and one of the fixed ends of the first single-pole three-throw switch, a 1GHz bandpass filter, a 500MHz bandpass filter, or a 200MHz bandpass filter, and one of the fixed ends and moving end of the second single-pole three-throw switch, before being output to the IF input and output module. The switch filter module can be controlled via a serial port program to select a 1GHz bandwidth filter channel, a 500MHz bandwidth filter channel, or a 200MHz bandwidth filter channel. The L-band IF signal is input from the IF input and output module, passes through the L-band transceiver circuit, and is output. The Ku-band RF signal follows this signal flow, undergoes double frequency conversion to achieve signal spectrum shifting, and is output as an L-band IF signal to the subsequent digital circuit for A / D sampling and processing.

[0043] The Ku / K band up / down conversion module opens the Ku band transmission mode through the serial port program and selects the Ku band transmission channel. The L-band IF signal is input from the IF input / output module, passes through the L-band transceiver circuit, and is output to the switch and filter module. The L-band IF signal is input from the switch and filter module, passes through the moving terminal and one of the fixed terminals of the second single-pole three-throw switch, a 1GHz bandpass filter, a 500MHz bandpass filter, or a 200MHz bandpass filter, one of the fixed terminals and the moving terminal of the first single-pole three-throw switch, and is output from the switch and filter module to the secondary frequency conversion module. The L-band IF signal is input from the secondary frequency conversion module, passes through the second bidirectional amplifier, enters the mixer IF terminal, undergoes frequency conversion, and outputs an X-band IF signal from the RF terminal. The signal is then output from the secondary frequency conversion module to the primary frequency conversion module. During the conversion process, a fixed local oscillator signal is output from the point frequency source and is input to the local oscillator input terminal of the second mixer. The X-band IF signal is input from the primary frequency conversion module, passes through the first bidirectional amplifier, enters the first mixer IF terminal, undergoes frequency conversion, and outputs a Ku-band RF signal from the RF terminal. The signal is then output from the secondary frequency conversion module to the RF input / output module. During the conversion process, the frequency synthesizer receives the control signal and outputs a corresponding local oscillator signal, which is then fed into the local oscillator input port of the first mixer. The Ku-band RF signal is input to the RF I / O module, passing through the active terminal of a single-pole double-throw switch, a fixed terminal, and the Ku-band transceiver front end before being output from the RF I / O module. The L-band IF signal follows this signal flow, undergoing two frequency conversions to achieve spectrum shifting. The output Ku-band RF signal is then fed through the power distribution network to the power amplifier in the T / R module and ultimately delivered to the antenna unit.

[0044] The Ku / K-band up and down conversion module opens the K-band receiving mode through the serial port program and can select the K-band receiving channel. The K-band RF signal is input from the RF input and output module, passes through the K-band transceiver front end, a fixed end and a moving end of the single-pole double-throw switch in sequence, and is output from the RF input and output module to the primary frequency conversion module. The K-band RF signal is input from the RF end of the first mixer of the primary frequency conversion module, and after conversion, the X-band intermediate frequency signal is output from the intermediate frequency end, and is output to the secondary frequency conversion module through the first bidirectional amplifier. During the conversion process, the frequency synthesizer receives the control signal and outputs the corresponding local oscillator signal, which is input to the local oscillator end of the first mixer; the X-band intermediate frequency signal is input from the RF end of the second mixer of the secondary frequency conversion module, and after frequency conversion, the L-band intermediate frequency signal is output from the intermediate frequency end, and is output to the switch filter module through the second bidirectional amplifier. During the conversion process, the point frequency source outputs a fixed local oscillator signal, which is input to the local oscillator input end of the second mixer; the L-band intermediate frequency signal is input from the RF end of the second mixer of the secondary frequency conversion module. The 1-band IF signal is input from the switch filter module, passes through the moving end and one of the fixed ends of the first single-pole three-throw switch, a 1GHz bandpass filter, a 500MHz bandpass filter, or a 200MHz bandpass filter, and one of the fixed ends and moving end of the second single-pole three-throw switch, and is output to the IF input and output module. The switch filter module can be controlled by a serial port program to select a 1GHz bandwidth filter channel, a 500MHz bandwidth filter channel, or a 200MHz bandwidth filter channel. The L-band IF signal is input from the IF input and output module, passes through the L-band transceiver circuit, and is output. The K-band RF signal follows this signal flow and uses a double frequency conversion method to achieve signal spectrum shifting. The output L-band IF signal is provided to the subsequent digital circuit for A / D sampling and processing.

[0045] The Ku / K band up and down conversion module opens the K band transmission mode through the serial port program and can select the K band transmission channel. The L band intermediate frequency signal is input from the intermediate frequency input and output module, and is output to the switch filter module through the L band transceiver circuit; the L band intermediate frequency signal is input from the switch filter module, and passes through the second single-pole three-throw switch moving end and one of the fixed ends, the 1GHz band-pass filter or the 500MHz band-pass filter or the 200MHz band-pass filter, one of the fixed ends and the moving end of the first single-pole three-throw switch, and is output from the switch filter module to the secondary frequency conversion module; the L band intermediate frequency signal is input from the secondary frequency conversion module, and enters the mixer intermediate frequency through the second bidirectional amplifier. After frequency conversion, the RF outputs an X-band IF signal, which is then output from the secondary frequency conversion module to the primary frequency conversion module. During this conversion process, the point frequency source outputs a fixed local oscillator signal, which is input to the local oscillator input of the second mixer. The X-band IF signal is input from the primary frequency conversion module, passes through a first bidirectional amplifier, and then enters the first mixer's IF terminal. After frequency conversion, the RF output outputs a K-band RF signal, which is then output from the secondary frequency conversion module to the RF input / output module. During this conversion process, the frequency synthesizer receives a control signal and outputs a corresponding local oscillator signal, which is then input to the local oscillator input of the first mixer. The K-band RF signal enters the RF input / output module, passes through the active end of a single-pole double-throw switch, a fixed end, and the K-band transceiver front end, before being output from the RF input / output module. Following this signal flow, the L-band IF signal undergoes double frequency conversion to achieve spectrum shifting. The output K-band RF signal is then connected to the power amplifier in the T / R module via the power distribution network and ultimately delivered to the antenna unit.

[0046] The Ku / K-band up / down conversion module is in silent mode through the serial port program. The Ku-band receiving channel, Ku-band transmitting channel, K-band receiving channel, and K-band receiving channel can be shut down. The Ku / K-band up / down conversion module is in low power consumption state and has no external signal output within the working frequency band.

[0047] Through the above design, the RF link in the present invention is a bidirectional frequency-converting link with the function of time-sharing multiplexing of the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel and the K-band transmitting channel, which effectively reduces the structural complexity of the module and has the characteristics of integration and miniaturization.

[0048] The above embodiment is only one of the preferred implementation methods of the present invention and should not be used to limit the scope of protection of the present invention. Any changes or modifications that have no substantive meaning made to the main design concept and spirit of the present invention, as long as the technical problems solved are still consistent with the present invention, should be included in the scope of protection of the present invention.

Claims

1. A Ku / K band up / down conversion method for a phased array antenna extension, characterized in that: The following steps are involved: S1, establish a bidirectional frequency conversion link with a Ku-band receiving channel, a Ku-band transmitting channel, a K-band receiving channel, and a K-band transmitting channel; S2, using a frequency synthesizer to provide a single local oscillator signal to the first mixer, and realizing the frequency hopping output of the local oscillator signal frequency through the serial port control program, and mixing it with the input RF signal to achieve a single frequency conversion; S3, using a point frequency source to provide a single-channel local oscillator signal with a fixed frequency to the second mixer, which is mixed with the primary frequency conversion signal to achieve secondary frequency conversion; S4, the secondary frequency conversion signal is controlled by the serial port program and output through the bandpass filter channels of different bandwidths of the switch filter module; S5, the output signal of the switch filter module is output through the L-band transceiver circuit to output the L-band intermediate frequency signal to the subsequent digital circuit for A / D sampling processing; thereby completing the spectrum shift of the RF signal with two frequency conversions.

2. The Ku / K band up / down conversion method for a phased array antenna extension according to claim 1, characterized in that: In step S1, a serial port program is used to control the selection switches of the Ku-band receiving channel, the Ku-band transmitting channel, the K-band receiving channel, and the K-band transmitting channel.

3. The Ku / K band up / down conversion method for a phased array antenna extension according to claim 2, characterized in that: In step S4, the switch filter module implements gating of a 1 GHz bandwidth filtering channel, a 500 MHz bandwidth filtering channel, or a 200 MHz bandwidth filtering channel through a 1 GHz bandpass filter, a 500 MHz bandpass filter, or a 200 MHz bandpass filter.

4. A Ku / K band up / down conversion circuit for a phased array antenna extension, characterized in that: Used to implement the Ku / K band up / down conversion method for a phased array antenna extension as described in any one of claims 1 to 3, the frequency conversion circuit includes a radio frequency input and output module, a primary frequency conversion module, a secondary frequency conversion module, a switch filter module, and an intermediate frequency input and output module connected in sequence; wherein the radio frequency input and output module, the primary frequency conversion module, the secondary frequency conversion module, the switch filter module, and the intermediate frequency input and output module are all bidirectional working modules.

5. The Ku / K band up / down conversion circuit for a phased array antenna extension according to claim 4, characterized in that: The RF signal input and output module includes a Ku-band transceiver front end, a K-band transceiver front end and a single-pole double-throw switch; wherein the Ku-band transceiver front end and the K-band transceiver front end are respectively connected to the two fixed ends of the single-pole double-throw switch, and the moving end of the single-pole double-throw switch is connected to the primary frequency conversion module, which is used to realize the selective input and selective output of the Ku-band and K-band RF signals.

6. The Ku / K band up / down conversion circuit for a phased array antenna extension according to claim 5, characterized in that: The primary frequency conversion module includes a first mixer, a frequency synthesizer, and a first bidirectional amplifier; wherein the RF end of the first mixer is connected to the active end of a single-pole double-throw switch, the local oscillator input end of the first mixer is connected to the frequency synthesizer, and the intermediate frequency end of the first mixer is connected to the first bidirectional amplifier; the other end of the first bidirectional amplifier is connected to the secondary frequency conversion module; the primary frequency conversion module is used to achieve spectrum shifting between Ku / K band RF signals and X band intermediate frequency signals.

7. The Ku / K band up / down conversion circuit for a phased array antenna extension according to claim 6, characterized in that: The secondary frequency conversion module includes a second mixer, a point frequency source, and a second bidirectional amplifier; the radio frequency end of the second mixer is connected to one end of the first bidirectional amplifier; the local oscillator input end of the second mixer is connected to the point frequency source, and the intermediate frequency end of the second mixer is connected to the second bidirectional amplifier; the other end of the second bidirectional amplifier is connected to the switch filter module; the secondary frequency conversion module is used to achieve spectrum shifting of the X-band intermediate frequency signal and the L-band intermediate frequency signal.

8. The Ku / K band up / down conversion circuit for a phased array antenna extension according to claim 7, characterized in that: The switch filter module includes a first single-pole triple-throw switch, a second single-pole triple-throw switch, a 1 GHz band-pass filter, a 500 MHz band-pass filter, and a 200 MHz band-pass filter; wherein the moving end of the first single-pole triple-throw switch is connected to one end of the second bidirectional amplifier; the three fixed ends of the first single-pole triple-throw switch are respectively connected to one end of the 1 GHz band-pass filter, the 500 MHz band-pass filter, and the 200 MHz band-pass filter; the other ends of the 1 GHz band-pass filter, the 500 MHz band-pass filter, and the 200 MHz band-pass filter are respectively connected to the three fixed ends of the second single-pole triple-throw switch; and the moving end of the second single-pole triple-throw switch is connected to the intermediate frequency input and output module.

9. The Ku / K band up / down conversion circuit for a phased array antenna extension according to claim 8, characterized in that: The intermediate frequency input and output module adopts an L-band transceiver circuit.

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