C-band single-local-oscillator dual-polarization dual-output circuit board structure

Abstract

The utility model relates to the technical field of amplifiers, and discloses a C-band single-local-oscillator dual-polarization dual-output circuit board structure which comprises a circuit board body, and the circuit board body is provided with a signal access port, a radio frequency amplification circuit, a two-stage radio frequency comb filter (BPF) circuit, a DRO oscillation circuit, an active frequency mixing circuit, an intermediate frequency amplification circuit and a multi-layer low-pass filter. A matrix switch circuit, an LC filter circuit and an output end; and the DRO oscillation circuit and the radio frequency amplification circuit are arranged at an interval. According to the C-frequency-band single-local-oscillator dual-polarization dual-output circuit board structure, the gain and the signal-to-noise ratio of radio frequency signals are improved, circuit signals are stable and high in quality, after signals transmitted from the radio frequency amplification circuit pass through the DRO oscillation circuit, local oscillator signals have high stability, the circuit is simple and reasonable in arrangement, the manual operation procedure is simple, and the cost is low. The frequency phase locking is accurate, the labor cost is reduced, and the method is suitable for batch production.

Description

Technical Field

[0001] The present application relates to the technical field of amplifiers, in particular to a low-noise frequency-reduction amplifier, and specifically to a C-band single local oscillator dual-polarization dual-output circuit board structure. Background Art

[0002] An LNB (low noise blockdown converter) is a low-noise, frequency-down amplifier consisting of a mixer and a local oscillator. LNBs are generally categorized as C-band LNBs (3.4GHz-4.2GHz) and KU-band LNBs (10.7GHz-12.75GHz). Because satellite signals are already quite weak before reaching the antenna, and because higher frequencies transmitted via coaxial cables experience greater signal loss, an LNB is needed to amplify them while minimizing signal-to-noise ratio degradation. The LNB's operation involves first amplifying the high-frequency satellite signal, then using a local oscillator circuit to convert it to an intermediate frequency (IF) of 950MHz-2150MHz (the IF range depends on the LNB type), and then further amplifying it for coaxial cable transmission and satellite receiver demodulation.

[0003] The circuit board structure commonly used in LNBs currently has complex circuit layout, complicated processing and manufacturing procedures, high labor costs, and is not suitable for mass production. Utility Model Content

[0004] The purpose of this application is to provide a C-band single local oscillator dual-polarization dual-output circuit board structure to solve the technical problems raised in the above background technology.

[0005] To achieve the above objectives, the present application discloses the following technical solutions: a C-band single local oscillator dual-polarization dual-output circuit board structure, comprising a circuit board body, on which are provided: a signal access port, a radio frequency amplifier circuit, a two-stage radio frequency comb filter (BPF) circuit, a DRO oscillator circuit, an active mixer circuit, an intermediate frequency amplifier circuit, a multi-layer low-pass filter, a matrix switch circuit, an LC filter circuit, and an output terminal; the DRO oscillator circuit is spaced apart from the radio frequency amplifier circuit;

[0006] The signal access port includes a vertical polarization signal access hole and a horizontal polarization signal access hole;

[0007] The radio frequency amplification circuit includes a vertical polarization primary amplification circuit, a horizontal polarization primary amplification circuit, a vertical polarization secondary amplification circuit, a horizontal polarization secondary amplification circuit, a vertical polarization tertiary amplification circuit, a horizontal polarization tertiary amplification circuit, a vertical polarization quaternary amplification circuit and a horizontal polarization quaternary amplification circuit;

[0008] The two-stage radio frequency comb filter BPF circuit includes a horizontally polarized first-stage radio frequency comb filter BPF circuit, a vertically polarized first-stage radio frequency comb filter BPF circuit, a horizontally polarized second-stage radio frequency comb filter BPF circuit, and a vertically polarized second-stage radio frequency comb filter BPF circuit;

[0009] The active mixing circuit includes a vertical polarization active mixing circuit and a horizontal polarization active mixing circuit;

[0010] The intermediate frequency amplifier circuit includes a vertical polarization first-stage intermediate frequency amplifier circuit, a horizontal polarization first-stage intermediate frequency amplifier circuit, a vertical polarization second-stage intermediate frequency amplifier circuit and a horizontal polarization second-stage intermediate frequency amplifier circuit;

[0011] The multilayer low-pass filter includes a vertically polarized intermediate frequency LTCC multilayer low-pass filter and a horizontally polarized intermediate frequency LTCC multilayer low-pass filter;

[0012] The output end includes a vertical polarization output end and a horizontal polarization output end;

[0013] The horizontally polarized signal access port, the horizontally polarized primary amplifier circuit, the horizontally polarized secondary amplifier circuit, the horizontally polarized tertiary amplifier circuit, the horizontally polarized primary RF comb filter BPF circuit, the horizontally polarized quaternary amplifier circuit and the horizontally polarized secondary RF comb filter BPF circuit, the horizontally polarized active mixer circuit, the horizontally polarized primary intermediate frequency amplifier circuit, the horizontally polarized intermediate frequency LTCC multilayer low-pass filter, the matrix switch circuit and the horizontally polarized secondary intermediate frequency amplifier circuit are connected in sequence;

[0014] The vertical polarization signal access port, the vertical polarization primary amplifier circuit, the vertical polarization secondary amplifier circuit, the vertical polarization tertiary amplifier circuit, the vertical polarization primary RF comb filter BPF circuit, the vertical polarization quaternary amplifier circuit and the vertical polarization secondary RF comb filter BPF circuit, the vertical polarization active mixer circuit, the vertical polarization primary intermediate frequency amplifier circuit, the vertical polarization intermediate frequency LTCC multilayer low-pass filter, the matrix switch circuit and the vertical polarization secondary intermediate frequency amplifier circuit are connected in sequence;

[0015] An LC filter circuit is respectively connected between the horizontally polarized first-stage intermediate frequency amplifier circuit and the horizontally polarized intermediate frequency LTCC multilayer low-pass filter, between the vertically polarized first-stage intermediate frequency amplifier circuit and the vertically polarized intermediate frequency LTCC multilayer low-pass filter, between the horizontally polarized intermediate frequency LTCC multilayer low-pass filter and the matrix switch circuit, and between the vertically polarized intermediate frequency LTCC multilayer low-pass filter and the matrix switch circuit;

[0016] The horizontal polarization active mixing circuit and the vertical polarization active mixing circuit are respectively connected to the DRO oscillation circuit;

[0017] The vertical polarization secondary intermediate frequency amplifier circuit is connected to the vertical polarization output end, and the horizontal polarization secondary intermediate frequency amplifier circuit is connected to the horizontal polarization output end.

[0018] Preferably, the horizontally polarized first-stage RF comb filter BPF circuit, the vertically polarized first-stage RF comb filter BPF circuit, the horizontally polarized second-stage RF comb filter BPF circuit and the vertically polarized second-stage RF comb filter BPF circuit are all 4.0GHZ-4.2GHZ comb bandpass filters.

[0019] Preferably, the matrix switch circuit is a 2*2SWITCH matrix switch circuit.

[0020] Preferably, the vertically polarized intermediate frequency LTCC multilayer low-pass filter and the horizontally polarized intermediate frequency LTCC multilayer low-pass filter are both intermediate frequency LTCC multilayer ceramic trap filters of 950 MHz to 1150 MHz.

[0021] Beneficial effects: The C-band single local oscillator dual-polarization dual-output circuit board structure of the present application, when the vertical and horizontal polarization signals are connected to the radio frequency amplifier circuit, the signal passes through the vertical polarization first-stage amplifier circuit, the horizontal polarization first-stage amplifier circuit, the vertical polarization second-stage amplifier circuit, and the horizontal polarization second-stage amplifier circuit, thereby improving the gain and signal-to-noise ratio of the radio frequency signal. The circuit signal is stable and the signal quality is high. Moreover, after the signal transmitted from the radio frequency amplifier circuit passes through the DRO oscillation circuit, the local oscillator signal has high stability. The C-band single local oscillator dual-polarization dual-output circuit board structure of the present application has a simple circuit and a reasonable layout, and has high product stability and reliability. Moreover, by adopting a method of mixing the oscillation signal and the radio frequency signal outside, the stability and signal-to-noise ratio of the local oscillator signal are improved. The circuit is simple and the layout is reasonable, the manual operation process is simple, the frequency phase locking is precise, the labor cost is reduced, and it is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of the C-band single local oscillator dual-polarization dual-output circuit board structure provided in an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the circuit connection of the C-band single local oscillator dual-polarization dual-output circuit board structure provided in the embodiment of the present application Figure 1 ;

[0025] Figure 3 Schematic diagram of the circuit connection of the C-band single local oscillator dual-polarization dual-output circuit board structure provided in the embodiment of the present application Figure 2 .

[0026] Figure 1: V100, vertical polarization signal access hole; H100, horizontal polarization signal access hole; V210, vertical polarization primary amplifier circuit; H210, horizontal polarization primary amplifier circuit; V220, vertical polarization secondary amplifier circuit; H220, horizontal polarization secondary amplifier circuit; V230, vertical polarization third amplifier circuit; H230, horizontal polarization third amplifier circuit; V240, vertical polarization fourth amplifier circuit; H240, horizontal polarization fourth amplifier circuit; H300, horizontal polarization primary RF comb filter BPF circuit; V300, vertical polarization primary RF comb filter BPF circuit; H310, horizontal polarization secondary RF comb filter BPF circuit; V310, vertically polarized secondary RF comb filter BPF circuit; 400, DRO oscillation circuit; V500, vertically polarized active mixing circuit; H500, horizontally polarized active mixing circuit; V600, vertically polarized first-stage intermediate frequency amplifier circuit; H600, horizontally polarized first-stage intermediate frequency amplifier circuit; V610, vertically polarized second-stage intermediate frequency amplifier circuit; H620, horizontally polarized second-stage intermediate frequency amplifier circuit; V700, vertically polarized intermediate frequency LTCC multilayer low-pass filter; H700, horizontally polarized intermediate frequency LTCC multilayer low-pass filter; 800, matrix switch circuit; V900, vertically polarized output terminal; H900, horizontally polarized output terminal. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In this document, the term "comprising" is intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0029] See also Figure 1-3

[0030] This embodiment discloses a C-band single local oscillator dual-polarization dual-output circuit board structure, including a circuit board body, on which are provided: a signal access port, a radio frequency amplifier circuit, a two-stage radio frequency comb filter (BPF) circuit, a DRO oscillator circuit 400, an active mixing circuit, an intermediate frequency amplifier circuit, a multi-layer low-pass filter, a matrix switch circuit 800, an LC filter circuit, and an output terminal; the DRO oscillator circuit 400 is separated from the radio frequency amplifier circuit.

[0031] Specifically: the signal access port includes the vertical polarization signal access port V100 and the horizontal polarization signal access port H100;

[0032] The radio frequency amplification circuit includes a vertical polarization primary amplification circuit V210, a horizontal polarization primary amplification circuit H210, a vertical polarization secondary amplification circuit V220, a horizontal polarization secondary amplification circuit H220, a vertical polarization tertiary amplification circuit V230, a horizontal polarization tertiary amplification circuit H230, a vertical polarization quaternary amplification circuit V240, and a horizontal polarization quaternary amplification circuit H240;

[0033] The two-stage radio frequency comb filter BPF circuit includes a horizontally polarized first-stage radio frequency comb filter BPF circuit H300, a vertically polarized first-stage radio frequency comb filter BPF circuit V300, a horizontally polarized second-stage radio frequency comb filter BPF circuit H310, and a vertically polarized second-stage radio frequency comb filter BPF circuit V310;

[0034] The active mixing circuit includes a vertical polarization active mixing circuit V500 and a horizontal polarization active mixing circuit H500;

[0035] The intermediate frequency amplifier circuit includes a vertical polarization first-stage intermediate frequency amplifier circuit V600, a horizontal polarization first-stage intermediate frequency amplifier circuit H600, a vertical polarization second-stage intermediate frequency amplifier circuit V610, and a horizontal polarization second-stage intermediate frequency amplifier circuit H610;

[0036] The multilayer low-pass filter includes a vertically polarized intermediate frequency LTCC multilayer low-pass filter V700 and a horizontally polarized intermediate frequency LTCC multilayer low-pass filter H700;

[0037] The output end includes a vertical polarization output end V900 and a horizontal polarization output end H900;

[0038] The horizontal polarization signal access hole H100, the horizontal polarization first-stage amplification circuit H210, the horizontal polarization second-stage amplification circuit H220, the horizontal polarization third-stage amplification circuit H230, the horizontal polarization first-stage radio frequency comb filter BPF circuit H300, the horizontal polarization fourth-stage amplification circuit H240 and the horizontal polarization second-stage radio frequency comb filter BPF circuit H310, the horizontal polarization active mixing circuit H500, the horizontal polarization first-stage intermediate frequency amplification circuit H600, the horizontal polarization intermediate frequency LTCC multilayer low-pass filter H700, the matrix switch circuit 800 and the horizontal polarization second-stage intermediate frequency amplification circuit H610 are sequentially connected;

[0039] The vertical polarization signal access hole V100, the vertical polarization first-stage amplification circuit V210, the vertical polarization second-stage amplification circuit V220, the vertical polarization third-stage amplification circuit V230, the vertical polarization first-stage radio frequency comb filter BPF circuit V300, the vertical polarization fourth-stage amplification circuit V240 and the vertical polarization second-stage radio frequency comb filter BPF circuit V310, the vertical polarization active mixing circuit V500, the vertical polarization first-stage intermediate frequency amplification circuit V600, the vertical polarization intermediate frequency LTCC multilayer low-pass filter V700, the matrix switch circuit 800 and the vertical polarization second-stage intermediate frequency amplification circuit V610 are sequentially connected;

[0040] An LC filter circuit is connected between the horizontal polarization first-stage intermediate frequency amplification circuit H600 and the horizontal polarization intermediate frequency LTCC multilayer low-pass filter H700, between the vertical polarization first-stage intermediate frequency amplification circuit V600 and the vertical polarization intermediate frequency LTCC multilayer low-pass filter V700, between the horizontal polarization intermediate frequency LTCC multilayer low-pass filter H700 and the matrix switch circuit 800, and between the vertical polarization intermediate frequency LTCC multilayer low-pass filter V700 and the matrix switch circuit 800, respectively.

[0041] The horizontal polarization active mixing circuit H500 and the vertical polarization active mixing circuit V500 are connected with the DRO oscillation circuit 400, respectively.

[0042] The vertical polarization second-stage intermediate frequency amplification circuit V610 is connected with the vertical polarization output end V900, and the horizontal polarization second-stage intermediate frequency amplification circuit H610 is connected with the horizontal polarization output end H900.

[0043] It is feasible that the horizontal polarization first-stage radio frequency comb filter BPF circuit H300, the vertical polarization first-stage radio frequency comb filter BPF circuit V300, the horizontal polarization second-stage radio frequency comb filter BPF circuit H310 and the vertical polarization second-stage radio frequency comb filter BPF circuit V310 are all 4.0GHZ-4.2GHZ comb band-pass filters. The matrix switch circuit 800 is a 2*2SWITCH matrix switch circuit. The vertical polarization intermediate frequency LTCC multi-layer low-pass filter V700 and the horizontal polarization intermediate frequency LTCC multi-layer low-pass filter H700 are both 950MHz-1150MHz intermediate frequency TLCC multi-layer ceramic notch filters.

[0044] The signal inlet is used for connecting external signals to the radio frequency amplification circuit. That is, after the signals are connected from the vertical polarization signal inlet hole V100 and the horizontal polarization signal inlet hole H100, the signals pass through the radio frequency amplification circuit, then pass through the DRO oscillation circuit 400, and finally are stably output from the vertical polarization output end V900 and the horizontal polarization output end H900 after mixing of the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500.

[0045] In the circuit board structure, the vertical polarization first-stage amplification circuit V210, the horizontal polarization first-stage amplification circuit H210, the vertical polarization second-stage amplification circuit V220, the horizontal polarization second-stage amplification circuit H220, the vertical polarization third-stage amplification circuit V230 and the horizontal polarization third-stage amplification circuit H230 can be regarded as a low-noise FET three-stage amplification circuit. Therefore, when the signals are connected to the radio frequency amplification circuit, the signals pass through the vertical polarization first-stage amplification circuit V210, the horizontal polarization first-stage amplification circuit H210, the vertical polarization second-stage amplification circuit V220, the horizontal polarization second-stage amplification circuit H220, the vertical polarization third-stage amplification circuit V230 and the horizontal polarization third-stage amplification circuit H230, so as to better improve the gain of the radio frequency signals, better improve the signal-to-noise ratio, and improve the signal quality of the circuit signals. Moreover, the signals transmitted from the radio frequency amplification circuit pass through the DRO oscillation circuit 400, and then are mixed in the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500, so as to make the local oscillator signals more stable. Therefore, by using the circuit board structure, the circuit is simple and reasonable in arrangement, the product has high stability and reliability, and by using the DRO external mixing method and the radio frequency signal external mixing method, the local oscillator signals are more stable and the signal-to-noise ratio is higher. It is worth mentioning that, due to the simple and reasonable circuit arrangement, the manual operation process is simpler, and the frequency phase-locked precision is higher. That is, the processing and manufacturing process is simple, the labor cost is low, and the product is suitable for batch production.

[0046] Through the design of two-stage radio frequency comb filter BPF circuit, the signal is better to improve the gain of radio frequency signal and improve the signal-to-noise ratio after passing through vertical polarization first-stage amplification circuit V210, horizontal polarization first-stage amplification circuit H210, vertical polarization second-stage amplification circuit V220, horizontal polarization second-stage amplification circuit H220, vertical polarization third-stage amplification circuit V230, horizontal polarization third-stage amplification circuit H230, vertical polarization fourth-stage amplification circuit V240 and horizontal polarization fourth-stage amplification circuit H240, the circuit signal is stable and the signal quality is higher, and the signal output from the radio frequency amplification circuit is filtered through horizontal polarization first-stage radio frequency comb filter BPF circuit H300 and vertical polarization first-stage radio frequency comb filter BPF circuit V300, then filtered through horizontal polarization second-stage radio frequency comb filter BPF circuit H310 and vertical polarization second-stage radio frequency comb filter BPF circuit V310V310, and then output after external mixing of DRO oscillation circuit 400, vertical polarization active mixing circuit V500 and horizontal polarization active mixing circuit H500, so that the local oscillator signal is more stable.

[0047] When the signal passes through the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500, the DRO oscillator 400 controls the frequency of the signal passing through the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500, so that the entire signal is in a stable state after passing through the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500, that is, the output local oscillator signal is more stable after external mixing of the DRO oscillation circuit 400, the vertical polarization active mixing circuit V500 and the horizontal polarization active mixing circuit H500.

[0048] In addition, through the design of vertical polarization first-stage intermediate frequency amplification circuit V600, horizontal polarization first-stage intermediate frequency amplification circuit H600, vertical polarization intermediate frequency LTCC multilayer low-pass filter V700 and horizontal polarization intermediate frequency LTCC multilayer low-pass filter H700H700, after the vertical polarization intermediate frequency LTCC multilayer low-pass filter V700 and the horizontal polarization intermediate frequency LTCC multilayer low-pass filter H700H700 multilayer filtering on the intermediate frequency amplification circuit, the matrix switch circuit 800 is connected, and the matrix switch circuit 800 can complete the vertical and horizontal polarization satellite signals required by two output ports (vertical polarization output port V900V900 and horizontal polarization output port H900H900) through different polarization switching voltages.

[0049] The circuit board structure utilizes a two-stage RF comb filter (BPF) circuit on the RF amplifier circuit, a multi-layer low-pass filter on the IF circuit to trap the interference, and then a multi-channel LC filter circuit. This eliminates interference signals from 5G mobile phone base stations, which have a frequency range of 3.4GHz-3.9GHz. The operating input frequency of this circuit board structure is 4.0GHz-4.2GHz, and the IF output frequency is 950MHz-1150MHz. The two-stage RF comb filter (BPF) circuit has a -56dB rejection rate for frequencies between 3.4GHz-3.9GHz, while the multi-layer low-pass filter and LC filter circuits have a -42dB rejection rate for IF signals. This ensures optimal operation in 5G base station environments, effectively avoiding the problem of traditional products being unable to operate in 5G base station environments. This circuit board structure also addresses the issue of interference between the signal frequencies received by this circuit board and those emitted by 5G mobile phone base stations, as these frequencies are close to those emitted by 5G mobile phone base stations. This circuit effectively filters out 5G base station signals. Therefore, during the reception process, the interference of the signal from the 5G mobile phone base station is avoided, which makes the overall reception more stable. In the environment of the 5G mobile phone base station, it can still operate and work normally, which ensures that the entire circuit board structure can work stably in different environments.

[0050] In summary, the C-band single local oscillator dual-polarization dual-output circuit board structure of this embodiment adopts a novel circuit design concept to replace the traditional circuit layout, making the product more stable and reliable. The local oscillator signal using this circuit board structure is more stable than that of a traditional PCB board, and the signal-to-noise ratio is greatly improved. Moreover, due to the simple circuit and reasonable layout of this circuit board structure, it is easy to operate, the overall operation process is simple, and the frequency phase locking is accurate. In other words, the stability of the local oscillation frequency in the entire receiving system is very important, and parameters such as frequency error and phase noise are crucial to signal demodulation. The circuit board body adopts a method of mixing the radio frequency signal and the local oscillation signal outside. This solves the stability of the local oscillation frequency very well and significantly saves the number of components used.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A C-band single local oscillator dual-polarization dual-output circuit board structure, characterized in that: The circuit board comprises a circuit board body, on which are provided: a signal access port, a radio frequency amplifying circuit, a two-stage radio frequency comb filter BPF circuit, a DRO oscillating circuit (400), an active mixing circuit, an intermediate frequency amplifying circuit, a multi-layer low-pass filter, a matrix switching circuit (800), an LC filtering circuit, and an output terminal; the DRO oscillating circuit (400) and the radio frequency amplifying circuit are spaced apart. The signal access port includes a vertical polarization signal access hole (V100) and a horizontal polarization signal access hole (H100); The radio frequency amplification circuit includes a vertical polarization primary amplification circuit (V210), a horizontal polarization primary amplification circuit (H210), a vertical polarization secondary amplification circuit (V220), a horizontal polarization secondary amplification circuit (H220), a vertical polarization tertiary amplification circuit (V230), a horizontal polarization tertiary amplification circuit (H230), a vertical polarization quaternary amplification circuit (V240) and a horizontal polarization quaternary amplification circuit (H240); The two-stage radio frequency comb filter BPF circuit comprises a horizontally polarized first-stage radio frequency comb filter BPF circuit (H300), a vertically polarized first-stage radio frequency comb filter BPF circuit (V300), a horizontally polarized second-stage radio frequency comb filter BPF circuit (H310), and a vertically polarized second-stage radio frequency comb filter BPF circuit (V310); The active mixing circuit includes a vertical polarization active mixing circuit (V500) and a horizontal polarization active mixing circuit (H500); The intermediate frequency amplifier circuit includes a vertical polarization first-stage intermediate frequency amplifier circuit (V600), a horizontal polarization first-stage intermediate frequency amplifier circuit (H600), a vertical polarization second-stage intermediate frequency amplifier circuit (V610) and a horizontal polarization second-stage intermediate frequency amplifier circuit (H610); The multilayer low-pass filter includes a vertically polarized intermediate frequency LTCC multilayer low-pass filter (V700) and a horizontally polarized intermediate frequency LTCC multilayer low-pass filter (H700); The output end includes a vertical polarization output end (V900) and a horizontal polarization output end (H900); The horizontal polarization signal access port (H100), the horizontal polarization first-stage amplifier circuit (H210), the horizontal polarization second-stage amplifier circuit (H220), the horizontal polarization third-stage amplifier circuit (H230), the horizontal polarization first-stage radio frequency comb filter BPF circuit (H300), the horizontal polarization fourth-stage amplifier circuit (H240), the horizontal polarization second-stage radio frequency comb filter BPF circuit (H310), the horizontal polarization active mixer circuit (H500), the horizontal polarization first-stage intermediate frequency amplifier circuit (H600), the horizontal polarization intermediate frequency LTCC multilayer low-pass filter (H700), the matrix switch circuit (800), and the horizontal polarization second-stage intermediate frequency amplifier circuit (H610) are connected in sequence; The vertical polarization signal access port (V100), the vertical polarization primary amplifier circuit (V210), the vertical polarization secondary amplifier circuit (V220), the vertical polarization tertiary amplifier circuit (V230), the vertical polarization primary radio frequency comb filter BPF circuit (V300), the vertical polarization quaternary amplifier circuit (V240), the vertical polarization secondary radio frequency comb filter BPF circuit (V310), the vertical polarization active mixer circuit (V500), the vertical polarization primary intermediate frequency amplifier circuit (V600), the vertical polarization intermediate frequency LTCC multilayer low-pass filter (V700), the matrix switch circuit (800), and the vertical polarization secondary intermediate frequency amplifier circuit (V610) are connected in sequence; An LC filter circuit is respectively connected between the horizontally polarized first-stage intermediate frequency amplifier circuit (H600) and the horizontally polarized intermediate frequency LTCC multilayer low-pass filter (H700), between the vertically polarized first-stage intermediate frequency amplifier circuit (V600) and the vertically polarized intermediate frequency LTCC multilayer low-pass filter (V700), between the horizontally polarized intermediate frequency LTCC multilayer low-pass filter (H700) and the matrix switch circuit (800), and between the vertically polarized intermediate frequency LTCC multilayer low-pass filter (V700) and the matrix switch circuit (800); The horizontal polarization active mixing circuit (H500) and the vertical polarization active mixing circuit (V500) are respectively connected to the DRO oscillation circuit (400); The vertical polarization secondary intermediate frequency amplifier circuit (V610) is connected to the vertical polarization output end (V900), and the horizontal polarization secondary intermediate frequency amplifier circuit (H610) is connected to the horizontal polarization output end (H900).

2. The C-band single local oscillator dual-polarization dual-output circuit board structure according to claim 1, characterized in that: The horizontally polarized first-stage radio frequency comb filter BPF circuit (H300), the vertically polarized first-stage radio frequency comb filter BPF circuit (V300), the horizontally polarized second-stage radio frequency comb filter BPF circuit (H310), and the vertically polarized second-stage radio frequency comb filter BPF circuit (V310) are all 4.0 GHz to 4.2 GHz comb bandpass filters.

3. The C-band single local oscillator dual-polarization dual-output circuit board structure according to claim 1, characterized in that: The matrix switch circuit (800) is a 2*2 SWITCH matrix switch circuit.

4. The C-band single local oscillator dual-polarization dual-output circuit board structure according to claim 1, characterized in that: The vertically polarized intermediate frequency LTCC multilayer low-pass filter (V700) and the horizontally polarized intermediate frequency LTCC multilayer low-pass filter (H700) are both intermediate frequency LTCC multilayer ceramic trap filters of 950MHz-1150MHz.

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