A high-isolation satellite communication antenna system

Abstract

The utility model discloses a kind of high-isolation degree Tian Tong satellite communication antenna systems, including stabilized power supply, receiving module, transmitting module, acoustic surface filter module, low-noise amplifier module and duplexer module;The stabilized power supply is respectively connected with low-noise amplifier module and duplexer module electricity;The duplexer module is respectively connected with transmitting module and low-noise amplifier module electricity;The acoustic surface filter module is respectively connected with receiving module and low-noise amplifier module electricity;The utility model uses TX / RX medium antenna upper and lower laminated PIN layout, avoids the interference of TX to RX, receiving LNA amplification chip is preposed SAW filter in input end, postposition single-stage duplexer in output end, realizes the isolation of more than 55dB, reaches TX / RX one-line and modularization, low-cost design, can be widely applied in intelligent network connected car, automatic driving and emergency communication scene.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted satellite communication technology, specifically to a high-isolation Tiantong satellite communication antenna system. Background Technology

[0002] With the development of vehicle-to-everything (V2X) and intelligent driving (Level 3 and above), the demand for real-time data transmission is increasing daily, requiring the coordinated operation of satellite communication (such as Tiantong) and the Global Navigation Satellite System (GNSS). This has led to a significant increase in demand for satellite communication. Tiantong satellite communication, as an independently controllable satellite mobile communication system in my country, possesses unique advantages in ensuring communication in special environments and in innovative applications of vehicle-mounted communication.

[0003] However, traditional Tiantong antenna systems have the following technical drawbacks:

[0004] 1. When the transmitter transmits (TX), it can easily interfere with the receiver (RX), which may damage the amplification chip in the low noise amplifier (LNA).

[0005] 2. Conventional processing methods require dual-path beams and multi-stage filters, which are costly;

[0006] 3. It occupies a large space and makes it difficult to achieve independent modularization of the antenna;

[0007] 4. It relies on satellite communication host (Satellite Box, SBOX) software control, resulting in poor compatibility.

[0008] Therefore, there is an urgent need for a high-isolation, miniaturized, modular, and low-cost Tiantong antenna system to meet the development needs of vehicle networking and intelligent driving. Utility Model Content

[0009] In view of this, in order to solve the problems of insufficient TX-RX isolation, high cost, large size and poor compatibility in existing Tiantong antenna systems, this utility model proposes a high-isolation Tiantong satellite communication antenna system, which has the advantages of high isolation, miniaturization, modularity and low cost, and is suitable for intelligent connected vehicles, autonomous driving and emergency communication scenarios.

[0010] This utility model solves the above problems through the following technical means:

[0011] This utility model provides a high-isolation Tiantong satellite communication antenna system, including a regulated power supply, a receiving module, a transmitting module, a surface acoustic wave filter module, a low-noise amplifier module, and a duplexer module;

[0012] The regulated power supply is electrically connected to the low-noise amplifier module and the duplexer module, respectively.

[0013] The duplexer module is electrically connected to the transmitting module and the low-noise amplifier module, respectively.

[0014] The surface acoustic wave (SAW) filter module is electrically connected to the receiving module and the low-noise amplifier module, respectively.

[0015] Transmission link: The modulated carrier signal from the satellite communication host enters through the VCC / RF OUT port of the duplexer module, and after being selected by the bandpass of the duplexer module, it is coupled to the transmission module and transmitted to the satellite;

[0016] Receive link: The receiving module converts the satellite downlink signal into an electrical signal, which is then frequency-selected by the surface acoustic wave (SAW) filter module and transmitted to the low-noise amplifier module for amplification. Finally, it is bandpass filtered by the duplexer module and transmitted to the receiving front end of the satellite communication host.

[0017] Preferably, the high-isolation Tiantong satellite communication antenna system further includes a coupling module, which is disposed between the circuits of the transmitting module and the duplexer module, and is electrically connected to the transmitting module and the duplexer module respectively.

[0018] Preferably, the regulated power supply includes a chip U1. Pin 2 of chip U1 is grounded. Pin 1 of chip U1 serves as a voltage input pin and is connected to one end of capacitor C13, one end of capacitor C8, one end of coil L3, and the EN enable pin of chip U1. The other end of coil L3 is connected to one end of TVS diode D1 and a duplexer module, and the other end of TVS diode D1 is grounded. Pin 4 of chip U1 is connected to one end of capacitor C1, and the other end of capacitor C1 is grounded. Pin 5 of chip U1 serves as an output pin and is connected to one end of capacitor C11, one end of capacitor C12, and a low-noise amplifier module. The other end of capacitor C11 and the other end of capacitor C12 are grounded.

[0019] Preferably, the receiving module includes an RX dielectric antenna, one end of which is connected to one end of capacitor C2 and one end of coil L1, the other end of coil L1 is connected to one end of capacitor C4 and one end of resistor R1, and the other end of resistor R1 is grounded; the other end of capacitor C2 is connected to one end of coil L4 and one end of capacitor C6, the other end of coil L4 is connected to the other end of capacitor C4 and one end of capacitor C9; the other end of capacitor C9 is connected to one end of ESD transistor D2, one end of coil L6 and surface acoustic wave filter module, the other end of ESD transistor D2 is grounded, and the other end of coil L6 is connected to the other end of capacitor C6 and the other end of the RX dielectric antenna; wherein capacitors C2, C4, C6, C9, coil L1, coil L4, coil L6 and resistor R1 together form the phase shifting network circuit of the receiving module.

[0020] Preferably, the transmitting module includes a TX dielectric antenna, one end of which is connected to one end of capacitor C3 and one end of coil L2, the other end of coil L2 is connected to one end of capacitor C5 and one end of resistor R2, and the other end of resistor R2 is grounded; the other end of capacitor C3 is connected to one end of coil L5 and one end of capacitor C7, the other end of coil L5 is connected to the other end of capacitor C5 and one end of capacitor C10; the other end of capacitor C10 is connected to one end of coil L7 and the coupling module, and the other end of coil L7 is connected to the other end of capacitor C7 and the other end of the TX dielectric antenna; wherein capacitors C3, C5, C7, C10, coil L2, coil L5, coil L7, and resistor R2 together form the phase-shifting network circuit of the transmitting module.

[0021] Preferably, the surface acoustic wave (SAW) filter module includes a SAW filter F1. Pins 1, 3, 4, and 6 of the SAW filter F1 are grounded. Pin 2 of the SAW filter F1 is connected to one end of capacitor C25, and the other end of capacitor C25 is connected to the receiving module. Pin 5 of the SAW filter F1 is connected to one end of capacitor C26 and one end of capacitor C30, and the other end of capacitor C30 is grounded. The other end of capacitor C26 is connected to one end of coil L9 and one end of capacitor C32, and the other end of capacitor C32 is grounded. The other end of coil L9 is connected to the low-noise amplifier module and one end of capacitor C33, and the other end of capacitor C33 is grounded.

[0022] Preferably, the low-noise amplifier module includes amplifier U2. Pin 2 of amplifier U2 is connected to the surface acoustic wave (SAW) filter module, pin 9 of amplifier U2 is grounded, pin 1 of amplifier U2 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of capacitor C20, one end of resistor R3, one end of capacitor C21, one end of capacitor C24, and one end of coil L8, the other end of capacitor C21 is grounded, the other end of capacitor C24 is grounded, the other end of resistor R3 is connected to a regulated power supply, and the other end of capacitor C20 is grounded; the other end of coil L8 is connected to pin 7 of amplifier U2 and capacitor C28. One end of capacitor C28 is connected to one end of coil L10. The other end of coil L10 is connected to one end of resistor R5 and one end of resistor R6. The other end of resistor R6 is grounded. The other end of resistor R5 is connected to one end of capacitor C29 and one end of resistor R7. The other end of resistor R7 is grounded. The other end of capacitor C29 is connected to one end of duplexer module and one end of capacitor C35. The other end of capacitor C35 is grounded. Pin 6 of amplifier U2 is connected to one end of resistor R8. The other end of resistor R8 is grounded. Resistors R5, R6, and R7 form a π-type attenuation circuit to achieve gain adjustment.

[0023] Preferably, the duplexer module includes a duplexer S1, pin 3 of which is connected to a low-noise amplifier module, pin 1 of which is connected to a coupling module, pin 2 of which is connected to one end of capacitor C22 and one end of coil L11 respectively, the other end of capacitor C22 is grounded, the other end of coil L11 is connected to one end of capacitor C23 and one end of capacitor C19 respectively, the other end of capacitor C23 is grounded, and the other end of capacitor C19 is connected to a regulated power supply.

[0024] Preferably, the coupling module includes capacitor C14 and capacitor C15. One end of capacitor C15 is connected to the duplexer module, and the other end of capacitor C15 is connected to one end of capacitor C14. The other end of capacitor C14 is connected to the transmitting module.

[0025] Preferably, the RX dielectric antenna and the TX dielectric antenna adopt a TX / RX stacked single-pin layout structure; the RX dielectric antenna and the TX dielectric antenna adopt left-hand circular polarization.

[0026] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0027] 1. High isolation: Through stacked layout, filtering suppression and polarization design, an isolation of more than 55dB is achieved to avoid TX interference to RX and damage to LNA chip;

[0028] 2. Low cost: The use of a one-line communication design and a single-stage duplexer reduces costs by 30% compared to conventional solutions;

[0029] 3. Miniaturization and modularization: The 38×38×6mm dielectric antenna layout and independent modular design reduce space occupation and facilitate vehicle installation;

[0030] 4. Strong compatibility: It does not rely on SBOX software for control and can be connected to the SBOX motherboard at one end, making it more adaptable. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the high-isolation Tiantong satellite communication antenna system of this utility model;

[0033] Figure 2 This is a schematic diagram of the voltage regulator of this utility model;

[0034] Figure 3 This is a schematic diagram of the receiving module of this utility model;

[0035] Figure 4 This is a schematic diagram of the transmitting module of this utility model;

[0036] Figure 5 This is a schematic diagram of the surface acoustic wave (SAW) filter module, low-noise amplifier module, duplexer module, and coupling module of this utility model. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the described embodiments are merely some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0038] like Figure 1 As shown, this utility model provides a high-isolation Tiantong satellite communication antenna system, including a regulated power supply, a receiving module, a transmitting module, a surface acoustic wave filter module, a low-noise amplifier module, a duplexer module, and a coupling module;

[0039] The regulated power supply is electrically connected to the low-noise amplifier module and the duplexer module, respectively.

[0040] The coupling module is electrically connected to the transmitting module and the duplexer module, respectively.

[0041] The surface acoustic wave (SAW) filter module is electrically connected to the receiving module and the low-noise amplifier module, respectively.

[0042] The low-noise amplifier module is electrically connected to the duplexer module.

[0043] Transmission link: The modulated carrier signal from the satellite communication host enters through the VCC / RF OUT port of the duplexer module, passes through the bandpass frequency selection of the duplexer module, and is coupled to the transmission module via the coupling module for transmission to the satellite;

[0044] Receive link: The receiving module converts the satellite downlink signal into an electrical signal, which is then frequency-selected by the surface acoustic wave (SAW) filter module and transmitted to the low-noise amplifier module for amplification. Finally, it is bandpass filtered by the duplexer module and transmitted to the receiving front end of the satellite communication host.

[0045] This utility model's LNA output terminal uses a duplexer to achieve transmit and receive isolation, avoiding signal crosstalk and enabling one-line operation. It facilitates simultaneous operation of the transmit and receive frequency bands separately. The antenna front end uses independent TX / RX pins, and the RX signal is pre-filtered, attenuating the TX signal by more than 55dB to ensure normal LNA operation.

[0046] This invention employs a 38×38×6mm TX / RX dielectric antenna (ceramic) stacked layer by layer, achieving 55dB isolation through a single-pin layout.

[0047] In the receiving link, the LNA amplifier chip is pre-filtered with a SAW filter (out-of-band rejection >35dB) and post-filtered with a single-stage duplexer (out-of-band rejection >30dB) to jointly suppress the transmitted signal.

[0048] The transmitting module operates at 1980MHz to 2010MHz with a maximum output power of 5W (37dBm); the receiving module operates at 2170MHz to 2200MHz, and after filtering and suppression, the transmitted signal strength input to the LNA is -18dBm (lower than the LNA input P1dB of -10dBm).

[0049] The transmitting and receiving modules are connected via a duplexer and are connected to the SBOX motherboard at one end, requiring no additional software control.

[0050] This invention meets the high TX / RX isolation requirements of the Tiantong system, and can solve the interference of multiple frequency bands (Tiantong S band + GNSS L band, Tiantong antenna with left-hand circular polarization LHCP, GNSS antenna with right-hand circular polarization RHCP); through innovative design, it realizes a miniaturized, modular, and low-cost Tiantong antenna system.

[0051] like Figure 2 As shown, the regulated power supply includes a chip U1. Pin 2 of chip U1 is grounded. Pin 1 of chip U1 serves as a voltage input pin and is connected to one end of capacitor C13, one end of capacitor C8, one end of coil L3, and the EN enable pin of chip U1. The other end of coil L3 is connected to one end of TVS diode D1 and a duplexer module, and the other end of TVS diode D1 is grounded. Pin 4 of chip U1 is connected to one end of capacitor C1, and the other end of capacitor C1 is grounded. Pin 5 of chip U1 serves as an output pin and is connected to one end of capacitor C11, one end of capacitor C12, and a low-noise amplifier module. The other end of capacitor C11 and the other end of capacitor C12 are grounded.

[0052] like Figure 3As shown, the receiving module includes an RX dielectric antenna. One end of the RX dielectric antenna is connected to one end of capacitor C2 and one end of coil L1. The other end of coil L1 is connected to one end of capacitor C4 and one end of resistor R1, and the other end of resistor R1 is grounded. The other end of capacitor C2 is connected to one end of coil L4 and one end of capacitor C6. The other end of coil L4 is connected to the other end of capacitor C4 and one end of capacitor C9. The other end of capacitor C9 is connected to one end of ESD transistor D2, one end of coil L6, and the surface acoustic wave filter module. The other end of ESD transistor D2 is grounded. The other end of coil L6 is connected to the other end of capacitor C6 and the other end of the RX dielectric antenna. Among them, capacitors C2, C4, C6, C9, coil L1, coil L4, coil L6, and resistor R1 together form the phase shifting network circuit of the receiving module.

[0053] like Figure 4 As shown, the transmitting module includes a TX dielectric antenna. One end of the TX dielectric antenna is connected to one end of capacitor C3 and one end of coil L2. The other end of coil L2 is connected to one end of capacitor C5 and one end of resistor R2, and the other end of resistor R2 is grounded. The other end of capacitor C3 is connected to one end of coil L5 and one end of capacitor C7. The other end of coil L5 is connected to the other end of capacitor C5 and one end of capacitor C10. The other end of capacitor C10 is connected to one end of coil L7 and the coupling module. The other end of coil L7 is connected to the other end of capacitor C7 and the other end of the TX dielectric antenna. Among them, capacitors C3, C5, C7, C10, coil L2, coil L5, coil L7, and resistor R2 together form the phase-shifting network circuit of the transmitting module.

[0054] like Figure 5 As shown, the surface acoustic wave (SAW) filter module includes a SAW filter F1. Pins 1, 3, 4, and 6 of the SAW filter F1 are grounded. Pin 2 of the SAW filter F1 is connected to one end of capacitor C25, and the other end of capacitor C25 is connected to the receiving module. Pin 5 of the SAW filter F1 is connected to one end of capacitor C26 and one end of capacitor C30, respectively. The other end of capacitor C30 is grounded. The other end of capacitor C26 is connected to one end of coil L9 and one end of capacitor C32, respectively. The other end of capacitor C32 is grounded. The other end of coil L9 is connected to the low-noise amplifier module and one end of capacitor C33, respectively. The other end of capacitor C33 is grounded.

[0055] Specifically, the low-noise amplifier module includes amplifier U2. Pin 2 of amplifier U2 is connected to the surface acoustic wave (SAW) filter module. Pin 9 of amplifier U2 is grounded. Pin 1 of amplifier U2 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of capacitor C20, one end of resistor R3, one end of capacitor C21, one end of capacitor C24, and one end of coil L8. The other end of capacitor C21 and capacitor C24 are grounded. The other end of resistor R3 is connected to a regulated power supply. The other end of capacitor C20 is grounded. The other end of coil L8 is connected to pin 7 of amplifier U2 and one end of capacitor C28. One end of capacitor C28 is connected to one end of coil L10. The other end of coil L10 is connected to one end of resistor R5 and one end of resistor R6. The other end of resistor R6 is grounded. The other end of resistor R5 is connected to one end of capacitor C29 and one end of resistor R7. The other end of resistor R7 is grounded. The other end of capacitor C29 is connected to one end of duplexer module and one end of capacitor C35. The other end of capacitor C35 is grounded. Pin 6 of amplifier U2 is connected to one end of resistor R8. The other end of resistor R8 is grounded. Resistors R5, R6, and R7 form a π-type attenuation circuit to achieve gain adjustment.

[0056] Specifically, the duplexer module includes a duplexer S1. Pin 3 of the duplexer S1 is connected to a low-noise amplifier module, pin 1 of the duplexer S1 is connected to a coupling module, pin 2 of the duplexer S1 is connected to one end of capacitor C22 and one end of coil L11 respectively, the other end of capacitor C22 is grounded, the other end of coil L11 is connected to one end of capacitor C23 and one end of capacitor C19 respectively, the other end of capacitor C23 is grounded, and the other end of capacitor C19 is connected to a regulated power supply.

[0057] Specifically, the coupling module includes capacitor C14 and capacitor C15. One end of capacitor C15 is connected to the duplexer module, and the other end of capacitor C15 is connected to one end of capacitor C14. The other end of capacitor C14 is connected to the transmitting module.

[0058] 1. Circuit Design Innovation

[0059] (1) This utility model adopts a TX / RX dielectric antenna (ceramic) stacked single PIN layout: a 38×38×6mm dielectric antenna (ceramic) is selected, and a 55dB isolation degree is achieved through the stacked single PIN design to reduce the direct interference of the transmitted signal to the receiving link.

[0060] (2) Receiver link optimization: The input end of the receiving LNA amplifier chip is pre-filtered with a SAW filter (out-of-band rejection > 35dB) and the output end is post-single-stage duplexer (out-of-band rejection > 30dB). Through joint suppression, the interference of the transmitted signal on the receiving link is reduced to below -18dBm (lower than -10dBm of the LNA input P1dB). At the same time, the duplexer realizes TX / RX one-line communication and connects to the SBOX motherboard at one end, without relying on SBOX software control.

[0061] 2. Isolation Guarantee Mechanism

[0062] System operating frequency: Transmit (TX) 1980MHz~2010MHz, Receive (RX) 2170MHz~2200MHz; Maximum output power at the transmitter is 5W (37dBm). Isolation is achieved through the following multi-dimensional suppression:

[0063] Antenna isolation 20dB;

[0064] SAW filter out-of-band rejection 35dB;

[0065] Duplexer out-of-band suppression 30dB;

[0066] Ultimately, this reduces the interference intensity of the transmitted signal in the receiving link to below -18dBm, preventing damage to the LNA amplifier chip.

[0067] 3. Polarization isolation design

[0068] The Tiantong antenna uses left-hand circular polarization (LHCP), while the GNSS antenna uses right-hand circular polarization (RHCP). The difference in polarization direction generates additional isolation, reducing interference from the coexistence of multiple frequency bands (Tiantong S-band + GNSS L-band).

[0069] The high-isolation Tiantong satellite communication antenna system of this embodiment has been successfully applied to the Mengshi vehicle and verified by the intelligent driving system. In actual operation, the interference of the transmitted signal to the receiving link is effectively suppressed, meeting the reliability and stability requirements of vehicle-mounted satellite communication.

[0070] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-isolation Tiantong satellite communication antenna system, characterized in that, It includes a regulated power supply, a receiving module, a transmitting module, a surface acoustic wave (SAW) filter module, a low-noise amplifier module, and a duplexer module; The regulated power supply is electrically connected to the low-noise amplifier module and the duplexer module, respectively. The duplexer module is electrically connected to the transmitting module and the low-noise amplifier module, respectively. The surface acoustic wave (SAW) filter module is electrically connected to the receiving module and the low-noise amplifier module, respectively. Transmission link: The modulated carrier signal from the satellite communication host enters through the VCC / RF OUT port of the duplexer module, and after being selected by the bandpass of the duplexer module, it is coupled to the transmission module and transmitted to the satellite; Receive link: The receiving module converts the satellite downlink signal into an electrical signal, which is then frequency-selected by the surface acoustic wave (SAW) filter module and transmitted to the low-noise amplifier module for amplification. Finally, it is bandpass filtered by the duplexer module and transmitted to the receiving front end of the satellite communication host.

2. The high-isolation Tiantong satellite communication antenna system according to claim 1, characterized in that, The high-isolation Tiantong satellite communication antenna system also includes a coupling module, which is located between the circuits of the transmitting module and the duplexer module, and is electrically connected to both the transmitting module and the duplexer module.

3. The high-isolation Tiantong satellite communication antenna system according to claim 1, characterized in that, The regulated power supply includes a chip U1. Pin 2 of chip U1 is grounded. Pin 1 of chip U1 serves as a voltage input pin and is connected to one end of capacitor C13, one end of capacitor C8, one end of coil L3, and the EN enable pin of chip U1. The other end of coil L3 is connected to one end of TVS diode D1 and a duplexer module. The other end of TVS diode D1 is grounded. Pin 4 of chip U1 is connected to one end of capacitor C1, and the other end of capacitor C1 is grounded. Pin 5 of chip U1 serves as an output pin and is connected to one end of capacitor C11, one end of capacitor C12, and a low-noise amplifier module. The other end of capacitor C11 and the other end of capacitor C12 are grounded.

4. The high-isolation Tiantong satellite communication antenna system according to claim 2, characterized in that, The receiving module includes an RX dielectric antenna. One end of the RX dielectric antenna is connected to one end of capacitor C2 and one end of coil L1. The other end of coil L1 is connected to one end of capacitor C4 and one end of resistor R1, and the other end of resistor R1 is grounded. The other end of capacitor C2 is connected to one end of coil L4 and one end of capacitor C6. The other end of coil L4 is connected to the other end of capacitor C4 and one end of capacitor C9. The other end of capacitor C9 is connected to one end of ESD transistor D2, one end of coil L6, and the surface acoustic wave filter module. The other end of ESD transistor D2 is grounded. The other end of coil L6 is connected to the other end of capacitor C6 and the other end of the RX dielectric antenna. Capacitors C2, C4, C6, C9, coil L1, coil L4, coil L6, and resistor R1 together form the phase-shifting network circuit of the receiving module.

5. The high-isolation Tiantong satellite communication antenna system according to claim 4, characterized in that, The transmitting module includes a TX dielectric antenna. One end of the TX dielectric antenna is connected to one end of capacitor C3 and one end of coil L2. The other end of coil L2 is connected to one end of capacitor C5 and one end of resistor R2, and the other end of resistor R2 is grounded. The other end of capacitor C3 is connected to one end of coil L5 and one end of capacitor C7. The other end of coil L5 is connected to the other end of capacitor C5 and one end of capacitor C10. The other end of capacitor C10 is connected to one end of coil L7 and the coupling module. The other end of coil L7 is connected to the other end of capacitor C7 and the other end of the TX dielectric antenna. Capacitors C3, C5, C7, C10, coil L2, coil L5, coil L7, and resistor R2 together form the phase-shifting network circuit of the transmitting module.

6. The high-isolation Tiantong satellite communication antenna system according to claim 1, characterized in that, The surface acoustic wave (SAW) filter module includes a SAW filter F1. Pins 1, 3, 4 and 6 of the SAW filter F1 are grounded. Pin 2 of the SAW filter F1 is connected to one end of capacitor C25, and the other end of capacitor C25 is connected to the receiving module. Pin 5 of the surface acoustic wave filter F1 is connected to one end of capacitor C26 and one end of capacitor C30 respectively. The other end of capacitor C30 is grounded. The other end of capacitor C26 is connected to one end of coil L9 and one end of capacitor C32 respectively. The other end of capacitor C32 is grounded. The other end of coil L9 is connected to the low noise amplifier module and one end of capacitor C33 respectively. The other end of capacitor C33 is grounded.

7. The high-isolation Tiantong satellite communication antenna system according to claim 1, characterized in that, The low-noise amplifier module includes amplifier U2. Pin 2 of amplifier U2 is connected to the surface acoustic wave (SAW) filter module. Pin 9 of amplifier U2 is grounded. Pin 1 of amplifier U2 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of capacitor C20, one end of resistor R3, one end of capacitor C21, one end of capacitor C24, and one end of coil L8. The other end of capacitor C21 and capacitor C24 are grounded. The other end of resistor R3 is connected to a regulated power supply, and the other end of capacitor C20 is grounded. The other end of coil L8 is connected to pin 7 of amplifier U2 and one end of capacitor C28. The other end of capacitor C28 is connected to one end of coil L10. The other end of coil L10 is connected to one end of resistor R5 and one end of resistor R6. The other end of resistor R6 is grounded. The other end of resistor R5 is connected to one end of capacitor C29 and one end of resistor R7. The other end of resistor R7 is grounded. The other end of capacitor C29 is connected to one end of duplexer module and one end of capacitor C35. The other end of capacitor C35 is grounded. Pin 6 of amplifier U2 is connected to one end of resistor R8. The other end of resistor R8 is grounded. Resistors R5, R6, and R7 form a π-type attenuation circuit to achieve gain adjustment.

8. The high-isolation Tiantong satellite communication antenna system according to claim 2, characterized in that, The duplexer module includes a duplexer S1. Pin 3 of the duplexer S1 is connected to a low-noise amplifier module. Pin 1 of the duplexer S1 is connected to a coupling module. Pin 2 of the duplexer S1 is connected to one end of capacitor C22 and one end of coil L11, respectively. The other end of capacitor C22 is grounded. The other end of coil L11 is connected to one end of capacitor C23 and one end of capacitor C19, respectively. The other end of capacitor C23 is grounded. The other end of capacitor C19 is connected to a regulated power supply.

9. The high-isolation Tiantong satellite communication antenna system according to claim 2, characterized in that, The coupling module includes capacitor C14 and capacitor C15. One end of capacitor C15 is connected to the duplexer module, and the other end of capacitor C15 is connected to one end of capacitor C14. The other end of capacitor C14 is connected to the transmitter module.

10. The high-isolation Tiantong satellite communication antenna system according to claim 5, characterized in that, The RX dielectric antenna and TX dielectric antenna adopt a TX / RX stacked single-pin layout structure; the RX dielectric antenna and TX dielectric antenna adopt left-hand circular polarization.

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