Antenna system and communication equipment

Abstract

The present application provides an antenna system and communication equipment for reducing the impact of added radio frequency devices on the sensitivity of the antenna receiving signal. The system specifically includes: a first channel for transmitting a first transmit signal to a first signal separation device; wherein the first channel includes a first phase shifter for adjusting the phase of the first transmit signal; a first signal separation device for transmitting the first transmit signal to a first antenna; receiving a first receive signal from the first antenna and transmitting the first receive signal to a second channel; a second channel for receiving the first receive signal from the first signal separation device and processing the first receive signal; wherein the second channel includes a first low-noise amplifier and a second phase shifter, the first low-noise amplifier is used to amplify the first receive signal to obtain a first receive signal after the signal is amplified; the second phase shifter is used to adjust the phase of the first receive signal after the signal is amplified.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to an antenna system and communication equipment. Background Art

[0002] During antenna operation, some antennas need to adjust their signal coverage angle to suit different situations, adjusting parameters such as signal strength and coverage area. Currently, the main approach is to add RF components to the antenna to adjust the phase of the transmitted and received signals, thereby adjusting the signal coverage angle. Antennas that adjust the signal coverage angle in this way are called electrically adjustable antennas.

[0003] However, existing electrically adjustable antennas have poor signal receiving sensitivity. Summary of the Invention

[0004] The present application provides an antenna system and a communication device for reducing the influence of an added radio frequency device on the sensitivity of the antenna receiving signals and improving the sensitivity of the antenna receiving signals.

[0005] In the first aspect, an embodiment of the present application provides an antenna system, which specifically includes: a first channel, the first channel is used to process a first transmit signal to obtain a processed first transmit signal, and transmit the processed first transmit signal to a first signal separation device; wherein the first channel includes a first phase shifter, and the first phase shifter is used to adjust the phase of the first transmit signal; the first signal separation device is used to separate the transmit signal from the receive signal after passing through the first signal separation device, including: transmitting the processed first transmit signal to the first antenna; receiving a first receive signal from the first antenna, and transmitting the first receive signal to a second channel; the second channel is used to receive the first receive signal from the first signal separation device, and process the first receive signal to obtain a processed first receive signal; wherein the second channel includes a first low-noise amplifier and a second phase shifter, the first low-noise amplifier is used to amplify the first receive signal to obtain a first receive signal after the amplification; the second phase shifter is used to adjust the phase of the first receive signal after the amplification.

[0006] In this solution, the phase shifter is retained at the signal transmitting end, ensuring the reliability of the antenna system's signal transmitting end when sending signals; a new phase shifter is added to the signal receiving end, and the low-noise amplifier is moved before the new phase shifter, avoiding the problem of increased noise in the signal caused by the received signal passing through multiple devices before entering the low-noise amplifier. This optimizes the system noise figure and improves the sensitivity of the antenna system's receiving signal.

[0007] In one possible design, the first channel also includes: a first filter, which is used to perform noise reduction processing on the first transmit signal to obtain a filtered first transmit signal, and transmit the filtered first transmit signal to the first phase shifter.

[0008] In this manner, the first filter can perform noise reduction processing on the first transmit signal, which can effectively improve the signal-to-noise ratio of the transmit signal and improve the performance of the antenna system.

[0009] In one possible design, the second channel also includes: a second filter, which is used to receive the first received signal from the first signal separation device, perform noise reduction processing on the first received signal to obtain a filtered first received signal, and transmit the filtered first received signal to the first low-noise amplifier.

[0010] In this manner, the second filter can filter out part of the noise in the first received signal, which can effectively improve the signal-to-noise ratio of the received signal and improve the performance of the antenna system.

[0011] In one possible design, the system also includes: a third filter, which is arranged between the first signal separation device and the first antenna; the third filter is used to receive the first transmit signal from the first signal separation device, perform noise reduction processing on the first transmit signal to obtain a filtered first transmit signal, and transmit the filtered first transmit signal to the first antenna; the third filter is also used to receive the first receive signal from the first antenna, perform noise reduction processing on the first receive signal to obtain a filtered first receive signal, and transmit the filtered first receive signal to the first signal separation device.

[0012] In this manner, the transmitting signal and the receiving signal share the same filter, which saves the implementation cost of this solution.

[0013] In one possible design, the system also includes: a third channel, the third channel is used to process the second transmit signal to obtain a processed second transmit signal, and transmit the processed second transmit signal to a second signal separation device; wherein the third channel includes a third phase shifter, and the third phase shifter is used to adjust the phase of the second transmit signal; the second signal separation device is used to separate the transmit signal from the receive signal after passing through the second signal separation device, including: transmitting the processed second transmit signal to the second antenna; and also receiving the second receive signal from the second antenna and transmitting the second receive signal to the fourth channel; the fourth channel is used to receive the second receive signal from the second signal separation device and process the second receive signal to obtain a processed second receive signal; wherein the fourth channel includes a second low-noise amplifier and a fourth phase shifter, the second low-noise amplifier is used to amplify the second receive signal to obtain a second receive signal after the amplification; the fourth phase shifter is used to adjust the phase of the second receive signal after the amplification.

[0014] In one possible design, the system also includes: a power amplifier for receiving a transmit signal from a baseband processor, power amplifying the transmit signal, and obtaining a transmit signal with amplified power; a power divider for processing the power-amplified signal to generate the first transmit signal and the second transmit signal; and allocating the first transmit signal to the first channel and allocating the second transmit signal to the third channel.

[0015] This method can fully utilize the advantages of multi-channel antennas and split the signals for transmission to achieve wider and more accurate antenna coverage.

[0016] In one possible design, the system also includes: a power synthesizer, used to synthesize the processed first received signal and the processed second received signal to obtain a synthesized received signal, and transmit the synthesized received signal to the baseband processor.

[0017] In one possible design, the system is a time division duplex (TDD) system, and the first signal separation device includes a circulator and a high-power switch, or the first signal separation device includes a high-power switch.

[0018] In one possible design, the system is a frequency division duplex (FDD) system, and the first signal separation device includes a duplexer, wherein the first signal separation device is also used to perform noise reduction processing on the transmitted signal and the received signal passing through the first signal separation device.

[0019] In a second aspect, an embodiment of the present application provides a communication device, which includes an antenna system as described in any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the electrically adjustable antenna solution in a time division duplex system;

[0022] Figure 2 This is a schematic diagram of the electrically adjustable antenna solution in a frequency division duplex system;

[0023] Figure 3 A schematic diagram of a possible antenna system provided for this application;

[0024] Figure 4 A schematic diagram of a possible antenna system for a time division duplex system provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of another possible antenna system applied to a time division duplex system provided in an embodiment of the present application;

[0026] Figure 6 A schematic diagram of another possible antenna system provided for this application;

[0027] Figure 7 A schematic diagram of a possible antenna system provided in an embodiment of the present application;

[0028] Figure 8 A schematic diagram of Example 1 provided in this application;

[0029] Figure 9 A schematic diagram of Example 2 provided in this application;

[0030] Figure 10 This is a schematic diagram of Example 3 provided in this application. DETAILED DESCRIPTION

[0031] The technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Unless there is a conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0032] It should be understood that in the description of the embodiments of this application, the terms "first" and "second" are used only for the purpose of distinguishing the description and should not be understood to indicate or imply relative importance or order. In the description of the embodiments of this application, "plurality" means two or more.

[0033] The term "and / or" in the embodiments of this application is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0034] Currently, there are two main implementation solutions for electrically steerable antennas:

[0035] Option 1: See Figure 1 , is a schematic diagram of the implementation scheme of the electrically adjustable antenna in the time division duplex (TDD) system. Figure 1 As shown in the figure, the transmit signal (marked by TX) sent by the baseband passes through the power amplifier to the circulator, and then to the high-power antenna filter. The power divider distributes it to multiple high-power phase shifters, which then phase-shift the transmit signal before it is finally transmitted outward by the antenna. The receive signal (marked by RX) is received by the antenna, phase-shifted by the high-power phase shifters, and then enters the high-power filter. It then passes through the circulator and reaches the low-noise amplifier, which amplifies the signal before sending it to the baseband processor.

[0036] Option 2, see Figure 2 , which is a schematic diagram of the implementation scheme of the electrically adjustable antenna in the frequency division duplex (FDD) system, as shown in FIG. Figure 2 As shown in the figure, the transmit signal from the baseband passes through the power amplifier to the duplexer, and then is distributed by the power divider to multiple high-power phase shifters. The phase shifters shift the transmit signal before it is finally transmitted outward by the antenna. After being received by the antenna, the received signal is phase-shifted by the high-power phase shifters and enters the duplexer. The duplexer transmits the received signal to the low-noise amplifier, which amplifies the signal before sending it to the baseband processor.

[0037] As can be seen from the two aforementioned solutions, after the antenna receives the signal, it passes through a phase shifter, a power combiner, a circulator / duplexer, and finally enters a low-noise amplifier. This signal flow inevitably introduces a lot of device noise into the received signal, reducing the signal-to-noise ratio (SNR) of the signal entering the low-noise amplifier. This, in turn, degrades the antenna system's sensitivity and reduces the base station's reception range.

[0038] In order to solve the above technical problems, the present application provides an antenna system to improve the sensitivity of the antenna in receiving signals.

[0039] The antenna system provided in the embodiments of the present application can be applied to various communication systems, such as: long-term evolution (LTE) systems, fifth-generation (5G) systems such as New Radio (NR), and next-generation communication systems such as 6G systems. Of course, the technical solutions of the embodiments of the present application can also be applied to other communication systems, such as satellite communication systems, vehicle-to-vehicle communication systems, etc.

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0041] See also Figure 3 , is a structural diagram of an antenna system provided in an embodiment of the present application. Figure 3 In the antenna system shown, an asymmetric architecture is adopted, and the signal transmitting end (including the first channel) and the signal receiving end (including the second channel) respectively use different devices, so that for the antenna provided in the embodiment of the present application, the transmitted signal and the received signal will pass through different devices respectively.

[0042] For ease of explanation, the embodiments of the present application are described below using communication between a base station antenna and a user terminal as an example.

[0043] In such Figure 3 The antenna system shown includes a first channel, a second channel, a first signal separation device and a first antenna; wherein the first channel includes a first phase shifter, the second channel includes a first low-noise amplifier and a second phase shifter, and the first signal separation device is used to separate the transmit signal and the receive signal.

[0044] Specifically, Figure 3 When the antenna system shown needs to transmit a signal, the first channel is used to process the first transmit signal: after the first transmit signal enters the first channel, the first phase shifter will adjust the phase of the first transmit signal; the first transmit signal after phase adjustment will be transmitted to the first signal separation device, and then transmitted to the first antenna by the first signal separation device, and finally sent by the first antenna.

[0045] When the antenna system receives a signal, the first received signal is received by the first antenna and enters the second channel via the first signal separation device. In the second channel, the received signal passes through the first low-noise amplifier and the second phase shifter. The first low-noise amplifier amplifies the first received signal to obtain the amplified first received signal, which is then transmitted to the second phase shifter. The second phase shifter adjusts the phase of the signal. The first phase shifter can be a high-power phase shifter to match the power of the transmitted signal, while the second phase shifter can be a low-power phase shifter to match the lower power of the received signal.

[0046] In this solution, a high-power phase shifter is retained at the signal transmitting end, ensuring the reliability of the antenna system's signal transmitting end when sending signals; while a low-power phase shifter is added to the signal receiving end, and the low-noise amplifier is moved before the low-power phase shifter. This can avoid the problem of increased noise in the signal caused by the received signal passing through multiple devices before entering the low-noise amplifier, optimize the system noise figure, and improve the sensitivity of the antenna system's receiving signal.

[0047] For TDD systems and FDD systems, different devices and implementation methods may be used in the specific implementation of this solution.

[0048] Optionally, for a TDD system, the first signal separation device may include a combination of a circulator and a high-power switch. Thus, when the TDD system transmits a signal, the high-power switch connects the switch to the grounded load, and the transmit signal is directly transmitted to the first antenna by the circulator, thereby preventing the high-power transmit signal from being transmitted to the second channel, thereby damaging the components of the second channel due to overload. When receiving a signal, the high-power switch is connected to the second channel, and the receive signal is transmitted to the second channel through the circulator.

[0049] This approach ensures that the transmission signal will not be transmitted to the second channel, avoids the risk of device damage due to overload, and improves the reliability of this solution.

[0050] Optionally, when the transmit signal power is low, the first signal separation device can include a high-power switch, eliminating the need for a circulator. For example, when transmitting, the high-power switch is connected to the first channel, allowing the transmit signal to pass smoothly through it and enter the first antenna. When receiving, the high-power switch is connected to the second channel, allowing the receive signal to pass smoothly through it and enter the second channel. This approach can reduce implementation costs.

[0051] In one possible implementation, for a TDD system, see Figure 4The first channel also includes a first filter for filtering out-of-band spurious noise and other noise present in the first transmit signal. The first filter can be a high-power filter to match the higher power of the first transmit signal. The first transmit signal first passes through the first filter before entering the first phase shifter.

[0052] In this manner, the first filter can perform noise reduction processing on the first transmit signal, which can effectively improve the signal-to-noise ratio of the transmit signal and improve the performance of the antenna system.

[0053] In one possible implementation, for a TDD system, see Figure 4 The second channel also includes a second filter for filtering out-of-band interference from the first received signal. The second filter can be a low-power filter to match the lower power of the first received signal. The first received signal first passes through the second filter before entering the first low-noise amplifier.

[0054] In this manner, the second filter can filter out part of the noise in the first received signal, which can effectively improve the signal-to-noise ratio of the received signal and improve the performance of the antenna system.

[0055] In another possible implementation, for a TDD system, see Figure 5 The antenna system provided in the embodiments of the present application may further include a third filter. In this design, the first and second channels do not include filters. Instead, a third filter is present between the first signal separator and the first antenna. The third filter is used to perform noise reduction processing on the transmitted signal and transmit the filtered transmitted signal to the first antenna. It is also used to perform noise reduction processing on the received signal and transmit the filtered received signal to the second channel. The third filter may be a high-power filter.

[0056] In this approach, there is no need to add an additional second filter. Instead, the filter is moved forward so that the transmit signal and the receive signal share the same filter, thereby saving the implementation cost of this solution.

[0057] Optionally, for an FDD system, the first signal separation device may include a duplexer. The duplexer is used to isolate the transmit signal from the receive signal, ensuring that both the signal transmitter and the signal receiver operate normally and preventing the transmit signal output from the first channel from entering the second channel. The duplexer also functions as a filter, separating the transmit signal from the receive signal while filtering both the transmit signal and the receive signal to improve their signal-to-noise ratio.

[0058] As described above, through different signal separation devices, this solution can be applied to both TDD systems and FDD systems, thereby improving the applicability of this solution.

[0059] The following implementations may be commonly adopted for both the TDD system and the FDD system.

[0060] Optional, see Figure 6 The antenna system may further include a third channel, a fourth channel, a second signal separation device, and a second antenna. The third channel includes a third phase shifter, the fourth channel includes a second low-noise amplifier and a fourth phase shifter, and the second signal separation device is configured to separate transmit and receive signals.

[0061] Specifically, the second transmit signal is transmitted via the third channel to the second signal separation device, which then transmits it to the second antenna. The second receive signal, received by the second antenna, is then transmitted via the second separation device to the fourth channel, where it is processed and output to the baseband. The specific processing methods for transmit signals in the third channel refer to those for the first channel, and the specific processing methods for receive signals in the fourth channel refer to those for the second channel, and are not further detailed here.

[0062] It should be understood that the devices included in the second signal separation device in the TDD system are the same as those included in the first signal separation device in the TDD system, and the devices included in the second signal separation device in the FDD system are the same as those included in the first signal separation device in the FDD system.

[0063] Optional, see Figure 7 The antenna system provided in this application may further include a power amplifier for receiving a transmit signal from a baseband processor and amplifying the power of the transmit signal to meet the requirements for signal transmission. The system may also include a power splitter for receiving the amplified transmit signal from the power amplifier and splitting the energy of the signal into a first transmit signal and a second transmit signal, respectively. The first transmit signal is transmitted to a first channel, while the second transmit signal is transmitted to a third channel.

[0064] This method can fully utilize the advantages of multi-channel antennas and split the signals for transmission to achieve wider and more accurate antenna coverage.

[0065] Optional, see Figure 7 The antenna system provided in the present application may also include a power synthesizer for receiving the processed first received signal and the second received signal from the second channel and the fourth channel, and synthesizing the first received signal and the second received signal to obtain a synthesized received signal; and transmitting the received signal to the baseband processor.

[0066] It should be understood that in the above introduction, although only four channels, namely the first channel, the second channel, the third channel and the fourth channel, are described, in actual production and life, more channels can be set according to specific usage requirements. The specific number of channels is not limited in this application.

[0067] It can be understood that the above embodiments can be combined with each other to achieve different technical effects.

[0068] The following describes several possible combinations through several specific examples.

[0069] Example 1: Implementation of a multi-channel antenna system in a TDD system.

[0070] See also Figure 8 The signal transmitter contains several channels, which are connected by a power divider. During transmission, the transmit signal TX is amplified by a power amplifier before entering a high-power filter to remove some out-of-band spurious signals before entering the power divider. The power divider then splits the transmit signal TX into a number of sub-transmit signals that match the number of channels in the transmitter. These sub-transmit signals are then fed to the high-power phase shifters in each channel for phase adjustment. After phase adjustment, the sub-transmit signals are then fed by a circulator to the corresponding antenna, which then completes the transmission.

[0071] The signal receiving end also includes several channels, and the antennas corresponding to these channels each receive several sub-received signals. These sub-received signals first pass through a circulator and enter a low-power filter. After filtering out some out-of-band interference from the received signal, they enter a low-noise amplifier (LNA). At this point, the sub-received signals in each channel first enter the LNA within that channel for signal amplification. This prevents the sub-received signals from being contaminated with device noise due to passing through the phase shifter, thereby optimizing the system noise of the antenna system. After signal amplification, the sub-received signals in each channel enter a low-power phase shifter for phase adjustment to shape the receive chain and ensure its coverage. Finally, these sub-received signals pass through a power combiner for signal synthesis, generating the combined receive signal RX. This signal is then transmitted to the baseband processor, completing signal reception.

[0072] Example 2: Another implementation of a multi-channel antenna system in a TDD system.

[0073] See also Figure 9 In this scheme, the signal is processed in all devices except the filter in the same way as Figure 8 The scheme shown is the same and will not be described here. Figure 8The difference with the solution shown here is that the filter is shared by both the transmitter and receiver. This eliminates the need for an additional low-power filter at the receiver, saving implementation costs while still optimizing system noise.

[0074] Example 3: Implementation of a multi-channel antenna system in an FDD system.

[0075] See also Figure 10 In this solution, the signal separation device is a duplexer, which performs both signal separation and filtering functions. Therefore, a filter is not required. Furthermore, in this solution, the received signal still first passes through a low-noise amplifier before entering a low-power phase shifter, thus ensuring the same optimization effect on system noise.

[0076] Based on the same technical concept, this application also provides a communication device, which includes any of the aforementioned antenna systems. The communication device can be any device with communication capabilities, such as a base station, mobile phone, drone, ship, satellite, ground station, etc., and this application does not impose any restrictions.

[0077] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0078] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0080] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0081] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An antenna system, characterized in that: The system is a time division duplex (TDD) system, comprising: a first channel, the first channel being configured to process a first transmit signal to obtain a processed first transmit signal, and transmit the processed first transmit signal to a first signal separation device; wherein the first channel includes a first phase shifter configured to adjust a phase of the first transmit signal; and the first signal separation device includes a circulator and a high-power switch, or the first signal separation device includes a high-power switch; The first signal separation device is configured to separate the transmit signal from the receive signal after passing through the first signal separation device, including: transmitting the processed first transmit signal to the first antenna; receiving the first receive signal from the first antenna, and transmitting the first receive signal to the second channel; The second channel is configured to receive the first received signal from the first signal separation device and process the first received signal to obtain a processed first received signal; wherein the second channel includes a first low-noise amplifier and a second phase shifter, the first low-noise amplifier is configured to amplify the first received signal to obtain an amplified first received signal; and the second phase shifter is configured to adjust the phase of the amplified first received signal. A power amplifier, configured to receive a transmission signal from the baseband processor and amplify the power of the transmission signal to obtain a transmission signal with amplified power; A power distributor is used to process the power-amplified signal to generate the first transmit signal and the second transmit signal, and distribute the first transmit signal to the first channel and distribute the second transmit signal to a third channel with the same structure as the first channel.

2. The system according to claim 1, wherein The first channel further includes: A first filter is used to perform noise reduction processing on the first transmit signal to obtain a filtered first transmit signal, and transmit the filtered first transmit signal to the first phase shifter.

3. The system according to claim 1 or 2, characterized in that The second channel further includes: The second filter is used to receive the first received signal from the first signal separation device, perform noise reduction processing on the first received signal to obtain a filtered first received signal, and transmit the filtered first received signal to the first low-noise amplifier.

4. The system according to claim 1, wherein: The system further comprises: a third filter, the third filter being arranged between the first signal separation device and the first antenna; The third filter is configured to receive the first transmit signal from the first signal separation device, perform noise reduction processing on the first transmit signal to obtain a filtered first transmit signal, and transmit the filtered first transmit signal to the first antenna; The third filter is further configured to receive the first received signal from the first antenna, perform noise reduction processing on the first received signal to obtain a filtered first received signal, and transmit the filtered first received signal to the first signal separation device.

5. The system according to claim 1, wherein: The system further comprises: a third channel, the third channel being configured to process the second transmit signal to obtain a processed second transmit signal, and transmit the processed second transmit signal to a second signal separation device; wherein the third channel includes a third phase shifter, the third phase shifter being configured to perform phase adjustment on the second transmit signal; The second signal separation device is configured to separate the transmit signal from the receive signal after passing through the second signal separation device, including: transmitting the processed second transmit signal to the second antenna; and further configured to receive a second receive signal from the second antenna and transmit the second receive signal to a fourth channel; The fourth channel is used to receive the second received signal from the second signal separation device and process the second received signal to obtain a processed second received signal; wherein, the fourth channel includes a second low-noise amplifier and a fourth phase shifter, the second low-noise amplifier is used to amplify the second received signal to obtain a second received signal after the amplification; the fourth phase shifter is used to adjust the phase of the second received signal after the amplification.

6. The system according to claim 5, wherein: The system further comprises: A power synthesizer is used to synthesize the processed first received signal and the processed second received signal to obtain a synthesized received signal, and transmit the synthesized received signal to the baseband processor.

7. A communication device, characterized in that: The communication device comprises the antenna system according to any one of claims 1 to 6.

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