Radio frequency circuit, radio frequency module and electronic equipment

Abstract

The invention provides a radio frequency circuit, a radio frequency module and electronic equipment, relates to the field of radio frequency, and can support an ENDC of at least two low-frequency combinations. The radio frequency circuit comprises a first transmit-receive link, a second transmit-receive link, a third transmit-receive link and a fourth receive link. The first transmit-receive link and the second transmit-receive link are connected with the first antenna. And the third transceiving link and the fourth receiving link are both connected with the second antenna. The first antenna and the second antenna are both low-frequency antennas. The first transmit-receive link is used for transmitting a first signal and receiving the first signal in a master set through the first antenna. And the second transceiving link is used for transmitting the third signal through the first antenna, performing main set receiving of the third signal and performing diversity receiving of the second signal. And the third transceiving link is used for transmitting the second signal through the second antenna, receiving the main set of the second signal and receiving the diversity of the third signal. And the fourth receiving link is used for performing diversity reception of the first signal through the second antenna.

Description

Radio frequency circuit, radio frequency module and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on November 28, 2022, with application number 202211501785.1 and invention name “A radio frequency circuit, radio frequency module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the radio frequency field, and in particular to a radio frequency circuit, a radio frequency module and an electronic device. Background Art

[0003] In the field of communications, radio frequency signals can be roughly divided into low-frequency signals, medium-frequency signals, medium-high-frequency signals, and high-frequency signals. Among them, low frequency refers to the frequency band below 960MHz, such as B8 (880MHz-960MHz), B5 (824MHz-894MHz), B28 (703MHz-803MHz), B20 (791MHz-862MHz), etc.

[0004] Among the aforementioned frequency bands, B20, B28, and B8 require two-by-two ENDC (E-UTRAN New Radio-Dual Connectivity, 4G and 5G dual connectivity). However, in related technologies, RF circuits typically only support one low-frequency ENDC combination.

[0005] Therefore, how to design a radio frequency circuit that can support multiple low-frequency combination ENDCs has become an urgent problem to be solved.

[0006] Summary of the Invention

[0007] The present application provides a radio frequency circuit, a radio frequency module and an electronic device, which can support at least two low-frequency combinations of ENDC without increasing the occupied space and have high practicality.

[0008] In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions.

[0009] In a first aspect, a radio frequency circuit is provided, comprising: a first transceiver link, a second transceiver link, a third transceiver link, and a fourth receive link. The first transceiver link and the second transceiver link are both connected to a first antenna. The third transceiver link and the fourth receive link are both connected to a second antenna. The first antenna and the second antenna are both low-frequency antennas. The first transceiver link is used to transmit a first signal and receive a primary set of the first signal via the first antenna. The second transceiver link is used to transmit a third signal, receive a primary set of the third signal, and receive a diversity set of the second signal via the first antenna. The first, second, and third signals are all low-frequency signals. Only the downlink frequency band of the second signal overlaps with the third signal, and the overlap overlaps with the downlink frequency band of the third signal. The first signal does not overlap with either the second or third signal. The distance between the uplink frequency band of the first signal and the uplink frequency band of the second signal is less than the distance between the uplink frequency band of the first signal and the uplink frequency band of the third signal. The third transceiver link is used to transmit the second signal, receive a primary set of the second signal, and receive a diversity set of the third signal via the second antenna. The fourth receive link is used to receive a diversity set of the first signal via the second antenna.

[0010] In one possible design, the first transceiver link includes a first duplexer and a first switch. The first duplexer is used to filter the uplink signal and the downlink signal of the first signal. The uplink signal of the first signal refers to the signal of the uplink frequency band of the first signal, and the downlink signal of the first signal refers to the signal of the downlink frequency band of the first signal. The first duplexer is connected to the first port, the second port and the first switch respectively. The first switch is connected to the first antenna. The first port is the output port of the first signal, and the second port is the main set receiving port of the first signal. When the first switch connects the first duplexer to the first antenna, the uplink signal of the first signal is output by the first port, passes through the first duplexer and the first switch in sequence, and is then transmitted through the first antenna. After the downlink signal of the first signal is received by the first antenna, it passes through the first switch and the first duplexer in sequence, and the main set reception is completed by the second port.

[0011] In one possible design, the first duplexer includes a first filter and a second filter. A common port of the first filter and the second filter is connected to the first switch. The first filter is also connected to the first port. The second filter is also connected to the second port. The passband of the first filter is the uplink frequency band of the first signal. The passband of the second filter is the downlink frequency band of the first signal. When the first switch connects the first duplexer to the first antenna, the uplink signal of the first signal is output by the first port, passes through the first filter and the first switch in sequence, and is then transmitted through the first antenna. After the downlink signal of the first signal is received by the first antenna, it passes through the first switch and the second filter in sequence, and is then received by the second port to complete the main set.

[0012] In one possible design, the fourth receive chain includes a third filter and a second switch. The third filter is connected to the second switch and the third port, respectively. The second switch is connected to the second antenna. The third port is a diversity receive port for the third signal. The passband of the third filter is the downlink frequency band of the third signal. When the second switch connects the third filter to the second antenna, the downlink signal of the third signal is received by the second antenna, passes through the second switch and the third filter in sequence, and is then received by the third port for diversity reception. The downlink signal of the third signal refers to the signal in the downlink frequency band of the third signal.

[0013] In one possible design, the second transceiver link includes a second duplexer and a first switch. The second duplexer is configured to filter the uplink signal of the third signal, the downlink signal of the third signal, and the downlink signal of the second signal. The uplink signal of the third signal refers to the signal in the uplink frequency band of the third signal, the downlink signal of the third signal refers to the signal in the downlink frequency band of the third signal, and the downlink signal of the second signal refers to the signal in the downlink frequency band of the second signal. The second duplexer is connected to the fourth port, the fifth port, and the first switch, respectively. The first switch is connected to the first antenna. The fourth port is the output port for the third signal, and the fifth port is the main reception port for the third signal and the diversity reception port for the second signal. When the first switch connects the second duplexer to the first antenna, the uplink signal of the third signal is output from the fourth port, passes through the second duplexer, and the first switch, and is then transmitted through the first antenna. The downlink signal of the third signal is received by the first antenna, passes through the first switch, the second duplexer, and is then received by the fifth port for main reception. The downlink signal of the second signal is received by the first antenna, passes through the first switch, the second duplexer, and is then received by the fifth port for diversity reception.

[0014] In one possible design, the second duplexer includes a fourth filter and a fifth filter. The common port of the fourth filter and the fifth filter is connected to the first switch. The fourth filter is also connected to the fourth port. The fifth filter is also connected to the fifth port. The passband of the fourth filter is the uplink frequency band of the third signal. The passband of the fifth filter is the downlink frequency band of the third signal and the downlink frequency band of the second signal. When the first switch connects the second duplexer to the first antenna, the uplink signal of the third signal is output by the fourth port, passes through the fourth filter and the first switch in sequence, and is then transmitted through the first antenna. After the downlink signal of the third signal is received by the first antenna, it passes through the first switch and the fifth filter in sequence, and is then received by the fifth port for main set. After the downlink signal of the second signal is received by the first antenna, it passes through the first switch and the fifth filter in sequence, and is then received by the fifth port for diversity.

[0015] In one possible design, the third transceiver link includes a third duplexer and a second switch. The third duplexer is configured to filter the uplink signal of the second signal, the downlink signal of the second signal, and the downlink signal of the third signal. The uplink signal of the second signal refers to the signal in the uplink frequency band of the second signal, the downlink signal of the second signal refers to the signal in the downlink frequency band of the second signal, and the downlink signal of the third signal refers to the signal in the downlink frequency band of the third signal. The third duplexer is connected to the sixth port, the seventh port, and the second switch, respectively. The second switch is connected to the second antenna. The sixth port is the output port for the second signal, and the seventh port is the main reception port for the second signal and the diversity reception port for the third signal. When the second switch connects the third duplexer to the second antenna, the uplink signal of the second signal is output from the sixth port, passes through the third duplexer, and the second switch, and is then transmitted through the second antenna. The downlink signal of the second signal is received by the second antenna, passes through the second switch, the third duplexer, and is then received by the seventh port for main reception. The downlink signal of the third signal is received by the second antenna, passes through the second switch, the third duplexer, and is then received by the seventh port for diversity reception.

[0016] In one possible design, the third duplexer includes a sixth filter and a seventh filter. The common port of the sixth filter and the seventh filter is connected to the second switch. The sixth filter is also connected to the sixth port. The seventh filter is also connected to the seventh port. The passband of the sixth filter is the uplink frequency band of the second signal. The passband of the seventh filter is the downlink frequency band of the second signal and the downlink frequency band of the third signal. When the second switch connects the third duplexer to the second antenna, the uplink signal of the second signal is output by the sixth port, passes through the sixth filter and the second switch in sequence, and is then transmitted through the second antenna. After the downlink signal of the second signal is received by the second antenna, it passes through the second switch and the seventh filter in sequence, and the main set reception is completed by the seventh port. After the downlink signal of the third signal is received by the second antenna, it passes through the second switch and the seventh filter in sequence, and the diversity reception is completed by the seventh port.

[0017] In one possible design, when the first signal performs ENDC with the second signal, the first transceiver link, the second transceiver link, the third transceiver link, and the fourth receive link are all connected. When the second signal performs ENDC with the third signal, the second transceiver link and the third transceiver link are connected, and the first transceiver link and the fourth receive link are disconnected.

[0018] In one possible design, the RF module further includes a fifth receive link and a sixth transceiver link. The fifth receive link is connected to the first antenna. The sixth transceiver link is connected to the second antenna. The fifth receive link is configured to perform diversity reception of a fourth signal via the first antenna. The sixth transceiver link is configured to transmit the fourth signal and perform primary reception of the fourth signal via the second antenna. The fourth signal does not overlap with the third signal.

[0019] In one possible design, the fifth receiving chain includes an eighth filter and a first switch. The eighth filter is connected to the first switch and the eighth port, respectively. The first switch is also connected to the first antenna. The eighth port is a diversity receiving port for the fourth signal. The passband of the eighth filter is the downlink frequency band of the fourth signal. When the first switch connects the eighth filter to the first antenna, the downlink signal of the fourth signal is received by the first antenna, passes through the first switch and the eighth filter in sequence, and is then received by the eighth port for diversity. The downlink signal of the fourth signal refers to the signal in the downlink frequency band of the fourth signal.

[0020] In one possible design, the sixth transceiver link includes a fourth duplexer and a second switch. The fourth duplexer is used to filter the uplink signal of the fourth signal and the downlink signal of the fourth signal. The uplink signal of the fourth signal refers to the signal of the uplink frequency band of the fourth signal, and the downlink signal of the fourth signal refers to the signal of the downlink frequency band of the fourth signal. The fourth duplexer is connected to the ninth port, the tenth port, and the second switch, respectively. The second switch is connected to the second antenna. The ninth port is the output port of the fourth signal, and the tenth port is the main set receiving port of the fourth signal. When the second switch connects the fourth duplexer to the second antenna, the uplink signal of the fourth signal is output by the ninth port, passes through the fourth duplexer and the second switch in sequence, and is then transmitted through the second antenna. The downlink signal of the fourth signal is received by the second antenna, passes through the second switch and the fourth duplexer in sequence, and is then received by the tenth port to complete the main set reception.

[0021] In one possible design, the fourth duplexer includes a ninth filter and a tenth filter. The common port of the ninth and tenth filters is connected to the second switch. The ninth filter is also connected to the ninth port. The tenth filter is also connected to the tenth port. The passband of the ninth filter is the uplink frequency band of the fourth signal. The passband of the tenth filter is the downlink frequency band of the fourth signal. When the second switch connects the fourth duplexer to the second antenna, the uplink signal of the fourth signal is output from the ninth port, passes through the ninth filter, and then the second switch, and is then transmitted through the second antenna. The downlink signal of the fourth signal is received by the second antenna, passes through the second switch, the tenth filter, and then is received by the tenth port for the main set.

[0022] In a second aspect, a radio frequency module is provided, comprising: the radio frequency circuit of any one of the first aspects, a first antenna, a second antenna, a signal output module, and a signal receiving module. The first transceiver link and the second transceiver link in the radio frequency circuit are both connected to the first antenna. The third transceiver link and the fourth receiving link in the radio frequency circuit are both connected to the second antenna. The signal output module is respectively connected to the first transceiver link, the second transceiver link, and the third transceiver link. The signal output module is used to output a low-frequency signal, and the low-frequency signal includes at least: a first signal, a second signal, and a third signal. The signal receiving module is respectively connected to the first transceiver link, the second transceiver link, the third transceiver link, and the fourth receiving link. The signal receiving module is used to receive a low-frequency signal.

[0023] In one possible design, the RF module further includes a third switch. The signal output module is connected to the RF circuit via the third switch. The third switch is configured to connect the signal output module to the first transceiver link and the third transceiver link, and disconnect the signal output module from the second transceiver link, when the first signal and the second signal perform ENDC. The third switch is also configured to connect the signal output module to the second transceiver link and the third transceiver link, and disconnect the signal output module from the first transceiver link, when the second signal and the third signal perform ENDC.

[0024] In a third aspect, an electronic device is provided, the electronic device comprising the radio frequency circuit of any one of the first aspect or the radio frequency module of any one of the second aspect.

[0025] It should be understood that the technical solutions provided in the second and third aspects above and their technical features can all correspond to the radio frequency circuit provided in the first aspect and its possible designs, so the beneficial effects that can be achieved are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of a low frequency band;

[0027] FIG2 is a schematic diagram of a radio frequency circuit;

[0028] FIG3 is a schematic diagram of another radio frequency circuit;

[0029] FIG4 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0030] FIG5 is a schematic diagram showing the relationship between a first signal, a second signal, and a third signal provided in an embodiment of the present application;

[0031] FIG6 is a schematic diagram of a radio frequency circuit provided in an embodiment of the present application;

[0032] FIG7 is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application;

[0033] FIG8 is a schematic diagram of the operation of a radio frequency circuit provided in an embodiment of the present application;

[0034] FIG9 is a schematic diagram of the operation of another radio frequency circuit provided in an embodiment of the present application;

[0035] FIG10 is a schematic diagram of the operation of another radio frequency circuit provided in an embodiment of the present application;

[0036] FIG11 is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application;

[0037] FIG12 is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application;

[0038] FIG13 is a schematic diagram of the operation of another radio frequency circuit provided in an embodiment of the present application;

[0039] FIG14 is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application;

[0040] FIG15 is a schematic diagram of a radio frequency module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In the embodiments of the present application, the terms "first," "second," and "third" are used to distinguish different objects rather than to define a specific order. In addition, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way.

[0042] To facilitate understanding of the embodiments of the present application, some concepts or terms are explained below.

[0043] TX: Transmit, which refers to the uplink frequency band of the RF signal. In this embodiment, the TX of frequency band z is referred to as zTX. Band z can be any frequency band. For example, the TX of B28 can be referred to as B28TX.

[0044] RX: stands for Receive, and refers to the downlink frequency band of the RF signal. In this embodiment of the application, the RX of frequency band z is called zRX. For example, the RX of B28 can be called B28RX.

[0045] In the embodiments of the present application, a signal in the uplink frequency band of a radio frequency signal may be referred to as the uplink signal of the radio frequency signal, and a signal in the downlink frequency band of a radio frequency signal may be referred to as the downlink signal of the radio frequency signal. For example, B28TX may be referred to as the uplink signal of B28, and B28RX may be referred to as the downlink signal of B28.

[0046] B28L: Due to its wide frequency coverage, the B28 band is generally divided into two bands, L and H. The lower frequency band is called B28L. B28LTX, or B28L, has an uplink frequency band of 703MHz-733MHz. B28LRX has an uplink frequency band of 758MHz-788MHz.

[0047] B28H: Due to its wide frequency coverage, the B28 band is generally divided into two bands, L and H. The higher frequency band is called B28H. B28HTX covers 718MHz-748MHz, and B28HRX covers 773MHz-803MHz.

[0048] ENDC: E-UTRAN New Radio-Dual Connectivity, refers to dual connectivity for 4G and 5G. 4G bands begin with the letter B, and 5G bands begin with the letter N. For example, ENDC of B20+N28 means that both the 4G band B20 and the 5G band N28 are connected and operate simultaneously.

[0049] It should be noted that when the numbers after the letters of the 4G and 5G frequency bands are the same, the frequency ranges covered are also the same. For example, B28 and N28 cover the same frequency range. Therefore, an RF module that can implement B20+N28 ENDC is equivalent to being able to implement B28+N20 ENDC, and will not be further explained.

[0050] Filters: Filters allow specific frequency components in a signal to pass while significantly attenuating other frequency components. In addition to filter circuits composed of capacitors and inductors, there are also acoustic filters. These filters may be surface acoustic wave (SAW) or bulk acoustic wave (BAW). Compared to filters composed of capacitors and inductors, acoustic filters have higher Q factors and better selectivity. They are generally used in TX+RX duplexers in the FDD (Frequency Division Duplexing) band and filters in the TDD (Time Division Duplex) band. It should be noted that there is usually a transition band between the passband and stopband of a filter. Therefore, without careful design, two filters with close passbands should not be connected to the antenna switch at the same time to enable both to be turned on simultaneously, otherwise the in-band performance will be significantly affected. For example, the passband of one filter is B20TX, which is 832MHz-862MHz, while the passband of another filter is B8TX, which is 880MHz-915MHz. The passbands of the two filters differ by 18 MHz, so they cannot be connected to the antenna switch at the same time to enable both. Otherwise, the performance of the filters within the passband will be greatly affected.

[0051] A duplexer can be thought of as two combined transmit and receive filters, sharing a common node (antenna) for simultaneous reception and transmission of RF signals. The duplexer's design ensures that the passband of each filter does not load the other. Furthermore, the transmit signal at the receive filter output is significantly attenuated. In other words, a well-designed duplexer achieves high transmit-receive isolation. Therefore, the passbands of the two filters making up the duplexer can be relatively close. For example, one filter in the duplexer might have a passband of B28TX, meaning 703MHz-748MHz; the other filter might have a passband of B28RX, meaning 758MHz-803MHz. Despite a 10MHz difference in the passbands of the two filters, the duplexer ensures that they can operate simultaneously without interfering with each other.

[0052] Low frequency: Low frequency refers to frequencies below 960MHz. Common low frequency bands include B28, B20, B26, B5, and B8. Please refer to Figure 1 for a diagram of a low frequency band. As shown in Figure 1, B28TX is 703MHz-748MHz; B28RX is 758MHz-803MHz; B20RX is 791MHz-821MHz; B20TX is 832MHz-862MHz; B26TX is 814MHz-849MHz; B26RX is 859MHz-894MHz; B5TX is 824MHz-849MHz; B5RX is 869MHz-894MHz; B8TX is 880MHz-915MHz; and B8RX is 925MHz-960MHz.

[0053] Based on the above explanations of concepts or terms, the application background of the embodiments of the present application is introduced below.

[0054] As people pursue smaller and lighter terminal devices, the space within them is becoming increasingly compact. Due to their large size, low-frequency antennas are typically only installed in terminal devices. Increasing the number to three would compromise performance and sacrifice space. Increasing the number to four would further complicate space design.

[0055] By way of example, a radio frequency circuit is described below. The radio frequency circuit transmits and receives signals through three low-frequency antennas, and can implement ENDC of B20+N28L or ENDC of B28L+N20.

[0056] Please refer to Figure 2, which is a schematic diagram of a radio frequency circuit. As shown in Figure 2, the radio frequency circuit includes a duplexer x, a duplexer y, a filter e, and a switch i. Duplexer x includes filters a and b. Duplexer y includes filters c and d. Duplexers x and y are each connected to switch i. Switch i is also connected to antennas f and g. Filter e is connected to antenna h.

[0057] Filter a is also connected to the main receive port of B20. Filter b is also connected to the transmit port of B20. Filter c is also connected to the main receive port of B28L. Filter d is also connected to the transmit port of B28L. Filter e is also connected to the diversity receive port of B28L+B20. The main receive port of B20 is used for main receive of the B20RX signal. The transmit port of B20 is used to transmit the B20TX signal. The main receive port of B28L is used for main receive of the B28LRX signal. The transmit port of B28L is used to transmit the B28LTX signal. The diversity receive port of B28L+B20 is used for diversity receive of the B28LRX and B20RX signals.

[0058] The passband of filter a is B20RX. The passband of filter b is B20TX. The passband of filter c is B28LRX. The passband of filter d is B28LTX. The passband of filter e is B28LRX and B20RX. Therefore, filter e is a broadband filter.

[0059] When this RF circuit is operating, switch i connects duplexer x to antenna f and duplexer y to antenna g. The main receive path for the B20RX signal is: antenna f, switch i, filter a, and the main receive port of the B20. The diversity receive path for the B20RX signal is: antenna h, filter e, and the diversity receive port of the B28L+B20. The transmit path for the B20TX signal is: the transmit port of the B20, filter b, switch i, and antenna f. The main receive path for the B28LRX signal is: antenna g, switch i, filter c, and the main receive port of the B28L. The diversity receive path for the B28LRX signal is: antenna h, filter e, and the diversity receive port of the B28L+B20. The transmit path for the B28LTX signal is: the transmit port of the B28L, filter d, switch i, and antenna g.

[0060] It should be noted that the connection relationship between the duplexer and the antenna is merely illustrative. In some embodiments, switch i can also operate in a crossover state, that is, duplexer x is connected to antenna g, and duplexer y is connected to antenna f. This will not be further described.

[0061] As can be seen in the RF circuit shown in Figure 2, both duplexers x and y are enabled, enabling B20 transmission and main channel reception, and B28L transmission and main channel reception. It should be noted that "dual enable" here means both channels operate simultaneously, but connected to different antennas, namely antenna f and antenna g. Furthermore, leveraging the overlapping nature of the B20RX and B28RX, a wideband filter e with passbands for the B28LRX and B20RX, along with antenna h, is used for diversity reception of the B20 and B28L channels, thus achieving B20+N28L ENDC or B28L+N20 ENDC.

[0062] However, while the RF circuit shown in Figure 2 can implement B20+N28L ENDC or B28L+N20 ENDC, it requires a new low-frequency antenna (antenna h), further squeezing the already tight space inside the terminal device. Furthermore, the RF circuit shown in Figure 2 only supports B20+N28L ENDC or B28L+N20 ENDC, and cannot support ENDC between other low-frequency bands, resulting in a relatively limited functionality. It is not possible to implement ENDC between other low-frequency bands using the same principles as the RF circuit shown in Figure 2, as explained below.

[0063] In the RF circuit shown in Figure 2, the B28LRX+B20RX filter can be used because the frequency difference between B28LRX (758MHz-788MHz) and B20RX (791MHz-821MHz) is small, and the bandwidth of 63MHz (758MHz-821MHz) is also narrow, so the filter is relatively easy to implement.

[0064] However, for low-frequency bands with a large frequency difference and wide bandwidth, it is difficult to realize a filter that meets the requirements due to the limited feasibility of SAW (Surface Acoustic Wave) filters.

[0065] For example, to implement a B8+N20 ENDC or a B20+N8 ENDC using principles similar to the RF circuit shown in Figure 2, a B20RX+B8RX filter is required. However, the frequency difference between B20RX (791MHz-821MHz) and B8RX (925MHz-960MHz) is 104MHz, resulting in a bandwidth of 169MHz, which exceeds the feasible range of a SAW filter. In other words, it is difficult to implement a filter with these specifications. Therefore, it is impossible to implement a B8+N20 ENDC or a B20+N8 ENDC using a B20RX+B8RX filter using principles similar to the RF circuit shown in Figure 2.

[0066] This RF circuit also cannot include a duplexer with both the B8RX and B8TX filters, or a duplexer x with both switches turned on. This is because the B8TX and B20TX frequencies differ by 18MHz, and turning both switches on would affect the in-band performance of the B8TX and B20TX filters.

[0067] In order to reduce the space occupied by the RF circuit and save space resources inside the terminal device, the related art also provides a RF circuit that can implement B20+N28L ENDC or B28L+N20 ENDC through two low-frequency antennas.

[0068] Please refer to Figure 3, which is a schematic diagram of another RF circuit. As shown in Figure 3, the RF circuit includes a triplexer w, a filter m, and a switch n. Triplexer w includes filters j, k, and l. Triplexer w is connected to switch n. Filter j is connected to the transmit port of B20. Filter k is connected to the transmit port of B28L. Filter l is connected to the main receive port of B20+B28L. One end of filter m is connected to the diversity receive port of B20+B28L, and the other end is connected to switch n. Switch n is also connected to antenna p and antenna q.

[0069] The B20 transmit port is used to send B20TX signals. The B28L transmit port is used to send B28LTX signals. The B28L+B20 main receive port is used for main receive of B28LRX and B20RX signals. The B28L+B20 diversity receive port is used for diversity receive of B28LRX and B20RX signals.

[0070] The passband of filter j is B20TX. The passband of filter k is B28LTX. The passbands of filter l and filter m are B28LRX and B20RX respectively.

[0071] When the RF circuit shown in Figure 3 is operating, switch n connects triplexer w to antenna p and filter m to antenna q. The B20TX signal transmission path is: B20's transmit port, filter j, switch n, and antenna p. The B20RX signal main receive path is: antenna p, switch n, filter l, and the B28L+B20 main receive port. The B28LTX signal transmission path is: B28L's transmit port, filter k, switch n, and antenna p. The B28LRX receive path is: antenna p, switch n, filter l, and the B28L+B20 main receive port. The B20RX and B28LRX diversity receive paths are: antenna q, switch n, filter m, and the B28L+B20 diversity receive port.

[0072] It should be understood that the connection relationship between the triplexer w, the filter m, the antenna q, and the antenna p may also be that the switch n connects the triplexer w to the antenna q, and connects the filter m to the antenna p.

[0073] As can be seen in the RF circuit shown in Figure 3, triplexer w enables B20 transmission and main set reception, and B28L transmission and main set reception. Antenna p handles both B20 transmission and main set reception, and B28L transmission and main set reception. Antenna q, in conjunction with another B20+B28L RX filter (filter m), enables diversity reception for both B20 and B28L. This achieves B20+N28L ENDC or B28L+N20 ENDC.

[0074] The RF circuit shown in Figure 3 can implement B20+N28L ENDC or B28L+N20 ENDC through the two low-frequency antennas already in the terminal device, without introducing additional low-frequency antennas.

[0075] However, for the same reason as the filter shown in Figure 2 above, it is difficult to implement a filter with B20RX+B8RX specifications. Therefore, it is not possible to achieve B20+N8 ENDC or B8+N20 ENDC by replacing the B20RX+B28LRX filter with a B20RX+B8RX filter.

[0076] This RF circuit also cannot incorporate a duplexer or triplexer with both the B8RX and B8TX filters turned on. This is because the B8TX and B20TX frequencies differ by 18MHz, and turning on both switches would affect the in-band performance of the B8TX and B20TX filters.

[0077] That is to say, the RF circuit in the related technology can only realize ENDC of B20+N28L or B28L+N20 under the premise of using two low-frequency antennas, and cannot realize ENDC of other low-frequency bands such as B8+N20 or B20+N8.

[0078] To this end, the embodiments of the present application provide a radio frequency circuit, a radio frequency module, and an electronic device that can implement ENDC of at least two low-frequency combinations through two low-frequency antennas, and have high practicality.

[0079] The radio frequency circuit or radio frequency module provided in the embodiment of the present application can be applied to electronic devices. The electronic device can refer to a device provided with a low-frequency antenna, radio frequency circuit or radio frequency module, such as a mobile phone, tablet computer, wearable device (such as a smart watch), vehicle-mounted device, laptop computer (Laptop), desktop computer, etc. Exemplary embodiments of electronic devices include but are not limited to devices equipped with Or portable terminals with other operating systems.

[0080] As an example, please refer to FIG4 , which is a schematic structural diagram of an electronic device 400 provided in an embodiment of the present application.

[0081] As shown in FIG4 , the electronic device 400 may include a processor 401 , a communication module 402 , a display screen 403 , and the like.

[0082] The processor 401 may include one or more processing units. For example, the processor 401 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video stream codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors 401.

[0083] The controller may be the nerve center and command center of the electronic device 400. The controller may generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.

[0084] Processor 401 may also include a memory for storing instructions and data. In some embodiments, the memory in processor 401 is a cache memory. This memory can store instructions or data that have just been used or are being recycled by processor 401. If processor 401 needs to use the same instruction or data again, it can directly access the memory. This avoids duplicate accesses, reduces processor 401's latency, and thus improves system efficiency.

[0085] In some embodiments, the processor 401 may include one or more interfaces. The interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface 411, among others.

[0086] Electronic device 400 implements display functionality through a GPU, display screen 403, and application processor 401. The GPU is a microprocessor for image processing that connects display screen 403 and application processor 401. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 401 may include one or more GPUs that execute program instructions to generate or modify display information.

[0087] The display screen 403 is used to display images, video streams, etc.

[0088] The communication module 402 may include antenna 1, antenna 2, mobile communication module 402A, and / or wireless communication module 402B. For example, the communication module 402 includes antenna 1, antenna 2, mobile communication module 402A, and wireless communication module 402B.

[0089] In addition, the radio frequency circuit and radio frequency module provided in the embodiment of the present application can also be set in the communication module 402.

[0090] The wireless communication function of the electronic device 400 can be implemented through antenna 1, antenna 2, mobile communication module 402A, wireless communication module 402B, a modem processor, and a baseband processor.

[0091] Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 400 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In other embodiments, the antennas can be used in conjunction with a tuning switch.

[0092] The mobile communication module 402A can provide solutions for wireless communications including 2G / 3G / 4G / 5G applied to the electronic device 400. The mobile communication module 402A may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 402A can receive electromagnetic waves from the antenna 1, filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 402A can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 402A can be set in the processor 401. In some embodiments, at least some of the functional modules of the mobile communication module 402A can be set in the same device as at least some of the modules of the processor 401.

[0093] The modem processor may include a modulator and a demodulator. The modulator is used to modulate the low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After being processed by the baseband processor, the low-frequency baseband signal is passed to the application processor. The application processor outputs a sound signal through an audio device (not limited to the speaker 406A, the receiver 406B, etc.) or displays an image or video stream through the display screen 403. In some embodiments, the modem processor may be an independent device. In other embodiments, the modem processor may be independent of the processor 401 and be set in the same device as the mobile communication module 402A or other functional modules.

[0094] The wireless communication module 402B can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc., which are applied to the electronic device 400. The wireless communication module 402B can be one or more devices that integrate at least one communication processing module. The wireless communication module 402B receives electromagnetic waves via the antenna 2, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 401. The wireless communication module 402B can also receive the signal to be sent from the processor 401, frequency modulate it, amplify it, and convert it into electromagnetic waves for radiation through the antenna 2.

[0095] In some embodiments, antenna 1 of electronic device 400 is coupled to mobile communication module 402A, and antenna 2 is coupled to wireless communication module 402B, so that electronic device 400 can communicate with a network and other devices via wireless communication technologies. The wireless communication technologies may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technology. The GNSS may include a global positioning system (GPS), a global navigation satellite system (GLONASS), a Beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS) and / or a satellite based augmentation system (SBAS).

[0096] In the embodiment of the present application, the communication module 402 may include a radio frequency module, and the radio frequency module includes an antenna 1 and an antenna 2. That is, the antenna 1 and the antenna 2 may be low-frequency antennas.

[0097] As shown in Figure 4, in some implementations, the electronic device 400 may also include an external memory interface 410, an internal memory 404, a universal serial bus (USB) interface 411, a charging management module 412, a power management module 413, a battery 414, an audio module 406, a speaker 406A, a receiver 406B, a microphone 406C, an earphone interface 406D, a sensor module 405, a button 409, a motor, an indicator 408, a camera 407, and a subscriber identification module (SIM) card interface, etc.

[0098] The charging management module 412 is configured to receive charging input from a charger. The charger can be either a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 412 can receive charging input from the wired charger via the USB interface 411. In some wireless charging embodiments, the charging management module 412 can receive wireless charging input via the wireless charging coil of the electronic device 400. While charging the battery 414, the charging management module 412 can also provide power to the electronic device 400 via the power management module 413.

[0099] The power management module 413 is used to connect the battery 414, the charging management module 412, and the processor 401. The power management module 413 receives input from the battery 414 and / or the charging management module 412, and provides power to the processor 401, the internal memory 404, the external memory, the display 403, the camera 407, and the wireless communication module 402B. The power management module 413 can also be used to monitor parameters such as the capacity of the battery 414, the number of battery 414 cycles, and the health status of the battery 414 (leakage, impedance). In some other embodiments, the power management module 413 can also be set in the processor 401. In other embodiments, the power management module 413 and the charging management module 412 can also be set in the same device.

[0100] The external memory interface 410 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 400. The external memory card communicates with the processor 401 via the external memory interface 410 to implement data storage functions. For example, files such as music and video streams can be stored on the external memory card.

[0101] The internal memory 404 can be used to store computer executable program codes, which include instructions. The processor 401 executes the instructions stored in the internal memory 404 to execute various functional applications and data processing of the electronic device 400.

[0102] The electronic device 400 can implement audio functions such as music playback and recording through the audio module 406 , the speaker 406A, the receiver 406B, the microphone 406C, the headphone jack 406D, and the application processor 401 .

[0103] The buttons 409 include a power button, a volume button, etc. The buttons 409 may be mechanical buttons 409 or touch buttons 409. The electronic device 400 may receive input from the buttons 409 and generate key signal input related to user settings and function control of the electronic device 400.

[0104] Indicator 408 may be an indicator light, which may be used to indicate charging status, power level changes, messages, missed calls, notifications, etc.

[0105] The SIM card interface is used to connect a SIM card. The SIM card can be connected to and separated from the electronic device 400 by inserting it into or removing it from the SIM card interface. The electronic device 400 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface at the same time. The types of the multiple cards can be the same or different. The SIM card interface can also be compatible with different types of SIM cards. The SIM card interface can also be compatible with external memory cards. The electronic device 400 interacts with the network through the SIM card to implement functions such as calls and data communications. In some embodiments, the electronic device 400 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the electronic device 400 and cannot be separated from the electronic device 400.

[0106] The sensor module 405 in the electronic device 400 may include touch sensors, pressure sensors, gyroscope sensors, air pressure sensors, magnetic sensors, acceleration sensors, distance sensors, proximity light sensors, ambient light sensors, fingerprint sensors, temperature sensors, bone conduction sensors and other components to realize the sensing and / or acquisition functions of different signals.

[0107] The above describes the electronic devices used in the RF circuits and RF modules provided in the embodiments of the present application. It should be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device 400. In other embodiments, the electronic device 400 may include more or fewer components than shown, or combine or split certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0108] The radio frequency circuit provided in the embodiments of the present application is described below.

[0109] The radio frequency circuit provided in the embodiment of the present application is used to implement an ENDC with at least two low-frequency combinations through a first antenna and a second antenna, wherein both the first antenna and the second antenna are low-frequency antennas.

[0110] It should be understood that the operating frequency of an antenna is determined by its size. High-frequency antennas are smaller, while low-frequency antennas are larger. For terminal devices, internal space is limited, generally allowing only two low-frequency antennas to be installed. Within this limitation, the embodiments of the present application provide a radio frequency circuit and radio frequency module that can implement ENDC with at least two low-frequency combinations using two low-frequency antennas.

[0111] For example, the RF circuit provided in the embodiment of the present application can implement ENDC of the first signal and the second signal, as well as ENDC of the second signal and the third signal, through the first antenna and the second antenna. The first signal, the second signal, and the third signal are all low-frequency signals, i.e., the frequencies are all less than 960 MHz.

[0112] In the embodiment of the present application, a certain relationship needs to be satisfied among the first signal, the second signal, and the third signal, which is illustrated below with reference to FIG5 .

[0113] Please refer to Figure 5, which is a schematic diagram of the relationship between the first signal, the second signal, and the third signal provided in an embodiment of the present application. As shown in Figure 5, only the downlink frequency band of the second signal overlaps with the third signal, and the overlap overlaps with the downlink frequency band of the third signal. The first signal does not overlap with the second signal or the third signal. The distance between the uplink frequency band of the first signal and the uplink frequency band of the second signal is less than the distance between the uplink frequency band of the first signal and the uplink frequency band of the third signal.

[0114] In some embodiments, the first signal may be greater than the second signal and the third signal as shown in Figure 5. In other embodiments, the first signal may also be smaller than the second signal and the third signal.

[0115] As an example, the first signal can be a signal in the B8 frequency band, the second signal can be a signal in the B20 frequency band, and the third signal can all be signals in the B28 frequency band. In other words, the RF circuit provided in the embodiment of the present application can implement B8+N20 (or B20+N8) ENDC and B20+N28 (or B28+N20) ENDC through two low-frequency antennas, the first antenna and the second antenna.

[0116] It should be noted that the RF circuit provided in the embodiment of the present application can theoretically also implement B8+N28 (or B28+N8) ENDC through the first antenna and the second antenna. However, in actual applications, the bandwidth of B8+N28 is 257MHz, which places very high requirements on the bandwidth of the antenna and is difficult to achieve. Therefore, the RF circuit provided in the embodiment of the present application is mainly used to implement B8+N20 (or B20+N8) ENDC and B20+N28 (or B28+N20) ENDC through the first antenna and the second antenna. If the first antenna and the second antenna meet the requirements, B8+N28 (or B28+N8) ENDC can also be implemented.

[0117] It should be understood that this is just an example description, and the first signal, the second signal, and the third signal may also be signals of other frequency bands, as long as they satisfy the above relationship. This application does not make any specific limitations on this.

[0118] Based on the above introduction to the first signal, the second signal, the third signal, the first antenna and the second antenna, the structure and working principle of the radio frequency circuit provided in the embodiment of the present application are described in detail.

[0119] Please refer to Figure 6, which is a schematic diagram of a radio frequency circuit provided in an embodiment of the present application. As shown in Figure 6, the radio frequency circuit includes: a first transceiver link 601, a second transceiver link 602, a third transceiver link 603, and a fourth receive link 604. The first transceiver link 601 and the second transceiver link 602 are both connected to the first antenna. The third transceiver link 603 and the fourth receive link 604 are both connected to the second antenna.

[0120] In the embodiment of the present application, the transceiver link refers to a receiving link and a transmitting link.

[0121] The first transceiver link 601 is used to transmit the first signal through the first antenna and receive the main set of the first signal. In other words, the transmit link of the first transceiver link 601 is used to transmit the first signal through the first antenna, and the receive link of the first transceiver link 601 is used to receive the main set of the first signal through the first antenna.

[0122] The second transceiver link 602 is used to transmit the third signal through the first antenna, receive the third signal in a main set, and receive the second signal in a diversity mode. In other words, the transmit link of the second transceiver link 602 is used to transmit the third signal through the first antenna, and the receive link of the second transceiver link 602 is used to receive the third signal in a main set and receive the second signal in a diversity mode.

[0123] It should be noted that in the radio frequency field, signal transmission and main set reception must be completed on the same antenna. Therefore, if the third signal is transmitted through the first antenna, it must be received through the first antenna for the main set.

[0124] The third transceiver link 603 is used to transmit the second signal through the second antenna, receive the second signal in a main set, and receive the third signal in a diversity mode. In other words, the transmit link of the third transceiver link 603 is used to transmit the second signal through the second antenna, and the receive link of the third transceiver link 603 is used to receive the second signal in a main set and receive the third signal in a diversity mode.

[0125] The fourth receiving chain 604 is used for diversity reception of the first signal through the second antenna.

[0126] The above is the structure of the RF circuit provided in an embodiment of the present application. As can be seen, the RF circuit includes three transceiver links and one receive link. These three transceiver links and one receive link work together to implement ENDC for the first and second signals, as well as ENDC for the second and third signals, as described in detail below.

[0127] When the first signal and the second signal perform ENDC, the first transceiver link transmits the first signal and receives the main set of the first signal through the first antenna, the second transceiver link performs diversity reception of the second signal through the first antenna, the third transceiver link transmits the second signal and receives the main set of the second signal through the second antenna, and the fourth receiving link performs diversity reception of the first signal through the second antenna.

[0128] When the second signal and the third signal perform ENDC, the second transceiver link transmits the third signal through the first antenna, receives the main set of the third signal, and receives the diversity of the second signal. The third transceiver link transmits the second signal through the second antenna, receives the main set of the second signal, and receives the diversity of the third signal.

[0129] In addition, in the RF circuit provided in the embodiment of the present application, when the uplink signal frequency of the first signal and the uplink signal frequency of the second signal are relatively close, mutual interference between the two signals transmitted by the same antenna can be avoided, which is beneficial to improving the transmission efficiency of the antenna. By way of example, the relationship between the first signal, the second signal, and the third signal is shown in Figure 5. That is to say, the uplink frequency band of the first signal pair and the uplink frequency band of the second signal are relatively close. In this way, the uplink signal of the first signal and the uplink signal of the second signal may interfere with each other when transmitted by the same antenna, affecting the transmission efficiency. Therefore, in the embodiment of the present application, when the first signal and the second signal perform ENDC, the uplink signal of the first signal is transmitted by the first antenna, and the uplink signal of the second antenna is transmitted by the second antenna. The two will not interfere with each other, which can reduce the risk of sensitivity degradation caused by intermodulation and reduce the risk of spurious emission.

[0130] Take the example of a first signal being a signal in the B8 frequency band and a second signal being a signal in the B20 frequency band. When ENDC is performed at B8+N20 (or B20+N8), the uplink signal of B8 and the uplink signal of B20 are very close, with only an 18MHz difference, and may interfere with each other when transmitted through the same antenna. For example, the third-order intermodulation components of B20 and B8 will affect the reception of B8. Therefore, in an embodiment of the present application, the B8TX signal is transmitted through the first transceiver link and the first antenna to perform the main set reception of the B8RX signal; the B20RX signal is received in diversity through the second transceiver link and the first antenna; the B20TX signal is transmitted through the third transceiver link and the second antenna to perform the main set reception of the B20RX signal; and the B8RX signal is received in diversity through the fourth receiving link. In this way, the mutual interference between the B8TX signal and the B20TX signal can be avoided, and the ENDC of B8+N20 (or B20+N8) can be achieved.

[0131] Based on the above description, it can be seen that the RF circuit provided in the embodiment of the present application can realize at least two low-frequency combinations of ENDC through two low-frequency antennas, and can effectively prevent the problem of low-frequency signal transmission signals intermodulating and affecting receiving sensitivity, which has high practicality. The specific implementation of the RF circuit is introduced below.

[0132] In the embodiment of the present application, the transceiver link may include a duplexer, and the receive link may include a filter. The explanation of the duplexer and the filter can be found in the aforementioned concept or term explanation section, and will not be repeated here.

[0133] Please refer to FIG7 , which is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application.

[0134] As shown in Figure 7, the first transceiver link of the radio frequency circuit includes a first duplexer 701 and a first switch 702. The first switch 702 is connected to the first antenna. The first duplexer 701 is used to filter the uplink signal and the downlink signal of the first signal. The first duplexer 701 includes a first filter 711 and a second filter 721. The passband of the first filter 711 is the uplink frequency band of the first signal. The passband of the second filter 721 is the downlink frequency band of the first signal. The common port of the first filter 711 and the second filter 721 is connected to the first switch 702. The first filter 711 is also connected to the first port 703. The second filter 721 is also connected to the second port 704. The first port 703 is the output port of the first signal, and the second port 704 is the main set receiving port of the first signal.

[0135] The second transceiver link of the RF circuit shares the first transceiver link with the first transceiver link. The second transceiver link also includes a second duplexer 705. The second duplexer 705 is used to filter the uplink signal of the third signal, the downlink signal of the third signal, and the downlink signal of the second signal. The second duplexer 705 includes a fourth filter 715 and a fifth filter 725. The passband of the fourth filter 715 is the uplink frequency band of the third signal. The passband of the fifth filter 725 is the downlink frequency band of the third signal and the downlink frequency band of the second signal. The common port of the fourth filter 715 and the fifth filter 725 is connected to the first switch 702. The fourth filter 715 is also connected to the fourth port 706. The fifth filter 725 is also connected to the fifth port 707. The fourth port 706 is the output port of the third signal, and the fifth port 707 is the main receiving port for the third signal and the diversity receiving port for the second signal.

[0136] The third transceiver link of the RF circuit includes a third duplexer 708 and a second switch 709. The second switch 709 is connected to the second antenna. The third duplexer 708 is used to filter the uplink signal of the second signal, the downlink signal of the second signal, and the downlink signal of the third signal. The third duplexer 708 includes a sixth filter 718 and a seventh filter 728. The passband of the sixth filter 718 is the uplink frequency band of the second signal. The passband of the seventh filter 728 is the downlink frequency band of the second signal and the downlink frequency band of the third signal. The common port of the sixth filter 718 and the seventh filter 728 is connected to the second switch 709. The sixth filter 718 is also connected to the sixth port 710. The seventh filter 728 is also connected to the seventh port 712. The sixth port 710 is the output port of the second signal, and the seventh port 712 is the main receiving port for the second signal and the diversity receiving port for the third signal.

[0137] The fourth receive link of the RF circuit shares the second switch 709 with the third transceiver link. The fourth receive link also includes a third filter 713. The passband of the third filter 713 is the downlink frequency band of the third signal. The third filter 713 is connected to the second switch 709 and the third port 714, respectively. The third port 714 is a diversity receive port for the third signal.

[0138] The above is a specific structure of the radio frequency circuit provided in the embodiment of the present application. Based on the above introduction to the circuit structure, the working principle of the circuit is described below.

[0139] First, the working principle of the circuit when the first signal and the second signal perform ENDC is introduced.

[0140] Please refer to Figure 8, which is a schematic diagram of the operation of a radio frequency circuit provided in an embodiment of the present application. As shown in Figure 8, when the first signal and the second signal perform ENDC, the first switch 702 connects the first duplexer 701 to the first antenna and the second duplexer 705 to the first antenna. The second switch 709 connects the third duplexer 708 to the second antenna and the third filter 713 to the second antenna.

[0141] The transmission path of the uplink signal of the first signal is: the first port 703, the first filter 711, the first switch 702, and the first antenna.

[0142] The main set receiving path of the downlink signal of the first signal is: the first antenna, the first switch 702, the second filter 721, and the second port 704. It can be seen that the transmission of the first signal and the main set receiving are both completed by the same antenna.

[0143] The diversity receiving path of the downlink signal of the first signal is: the second antenna, the second switch 709 , the third filter 713 , and the third port 714 .

[0144] The transmission path of the uplink signal of the second signal is: sixth port 710, sixth filter 718, second switch 709, and second antenna. In other words, the transmission of the first signal and the second signal are completed on different antennas, which will not interfere with each other and can reduce the risk of cross-modulation and spurious emission.

[0145] The main set receiving path of the downlink signal of the second signal is: the second antenna, the second switch 709, the seventh filter 728, and the seventh port 712. It can be seen that the transmission path of the second signal and the main set receiving path are both completed by the same antenna.

[0146] The diversity receiving path of the downlink signal of the second signal is: the first antenna, the first switch 702 , the fifth filter 725 , and the fifth port 707 .

[0147] The first switch 702 allows the first duplexer 701 and the second duplexer 705 to be turned on and work simultaneously. The second switch 709 allows the third duplexer 708 and the third filter 713 to be turned on and work simultaneously.

[0148] In this way, ENDC of the first signal and the second signal is achieved.

[0149] The following is an example in which the first signal is a signal in the B8 frequency band and the second signal is a signal in the N20 frequency band. The same is true when the first signal is a signal in the N8 frequency band and the second signal is a signal in the B20 frequency band, and details are not given here.

[0150] When the first signal is a signal in the B8 frequency band and the second signal is a signal in the N20 frequency band, the bandwidths of the first antenna and the second antenna should cover the B8 and N20 frequency bands.

[0151] The first port 703 is used to output the B8TX signal, and the passband of the first filter 711 is B8TX. The second port 704 is used for main set reception of the B8RX signal, and the passband of the second filter 721 is B8RX. The fifth port 707 is used for diversity reception of the N20RX signal and main set reception of the downlink signal of the third signal, and the passband of the fifth filter 725 is the downlink frequency band of N20RX and the third signal. The sixth port 710 is used to output the N20TX signal, and the passband of the sixth filter 718 is N20TX. The seventh port 712 is used for main set reception of the N20RX signal and diversity reception of the downlink signal of the third signal, and the passband of the seventh filter 728 is the downlink frequency band of N20RX and the third signal. The third port 714 is used for diversity reception of the B8RX signal, and the passband of the third filter 713 is B8RX.

[0152] One important reason why the RF circuit shown in Figures 2 and 3 does not support the ENDC of B8+N20 is that the dual opening of the B8TX filter and the N20TX filter will affect the in-band performance of the filter and affect the normal operation of the RF circuit. In the RF module provided in the embodiment of the present application, the transceiver link of the B8TX signal and the transceiver link of the N20TX signal are connected to different antennas through different switches, that is, the transmission of the B8TX signal and the transmission of the N20TX signal are realized by different switches. In addition to the aforementioned avoidance of the risk of intermodulation and spurious interference caused by TX signal interference, at the same time, in the dual opening case, the N20TX performance optimization can be ignored, and the focus is on optimizing the RX frequency band of B8TX, B8RX and N20+ third signal downlink, that is, ignoring the performance of the fourth filter 715, focusing on optimizing the performance of the first filter 711, the second filter 721, and the fifth filter 725. Avoiding the dual opening of the B8TX filter and the N20TX filter is beneficial to improving the transmission efficiency of the signal.

[0153] The following describes the working principle of the circuit when the second signal and the third signal perform ENDC.

[0154] Please refer to Figure 9, which is a schematic diagram of another RF circuit operation according to an embodiment of the present application. As shown in Figure 9, when the second and third signals are performing ENDC, the first switch 702 connects the second duplexer 705 to the first antenna. The second switch 709 connects the third duplexer 708 to the second antenna.

[0155] The transmission path of the uplink signal of the second signal is: the sixth port 710, the sixth filter 718, the second switch 709, and the second antenna. In other words, the transmission of the first signal and the transmission of the second signal are completed on different antennas, which will not interfere with each other and is conducive to improving transmission efficiency.

[0156] The main set receiving path of the downlink signal of the second signal is: the second antenna, the second switch 709, the seventh filter 728, and the seventh port 712. It can be seen that the transmission path of the second signal and the main set receiving path are both completed by the same antenna.

[0157] The diversity receiving path of the downlink signal of the second signal is: the first antenna, the first switch 702 , the fifth filter 725 , and the fifth port 707 .

[0158] The transmission path of the uplink signal of the third signal is: the fourth port 706, the fourth filter 715, the first switch 702, and the first antenna.

[0159] The main set receiving path of the downlink signal of the third signal is: the first antenna, the first switch 702, the fifth filter 725, and the fifth port 707. It can be seen that the transmission of the third signal and the main set receiving are both completed by the same antenna.

[0160] The diversity receiving path of the downlink signal of the third signal is: the second antenna, the second switch 709 , the seventh filter 728 , and the seventh port 712 .

[0161] In this way, ENDC of the second signal and the third signal is achieved.

[0162] The following is an example in which the second signal is a signal in the B20 frequency band and the third signal is a signal in the N28 frequency band. The same is true when the second signal is a signal in the N20 frequency band and the third signal is a signal in the B28 frequency band, and details are not given here.

[0163] When the second signal is a signal in the B20 frequency band and the third signal is a signal in the N28 frequency band, the bandwidths of the first antenna and the second antenna should cover the B20 and N28 frequency bands.

[0164] The fourth port 706 is used to output the N28TX signal, and the passband of the fourth filter 715 is N28TX. The fifth port 707 is used to perform main set reception of the N28RX signal and diversity reception of the B20RX signal. The passband of the fifth filter 725 is N28RX and B20RX. The sixth port 710 is used to output the B20TX signal, and the passband of the sixth filter 718 is B20TX. The seventh port 712 is used to perform main set reception of the B20RX signal and diversity reception of the N28RX signal. The passband of the seventh filter 728 is B20RX and N28RX.

[0165] The RF circuit provided in the embodiment of the present application can theoretically implement ENDC of the first signal and the third signal, provided that the antenna meets the requirements. Meeting the requirements means that the antenna bandwidth can cover the first signal and the third signal.

[0166] The following describes the working principle of the circuit when the first signal and the third signal perform ENDC.

[0167] Please refer to Figure 10, which is a schematic diagram of the operation of another RF circuit provided in an embodiment of the present application. As shown in Figure 10, when the first and third signals are performing ENDC, the first switch 702 connects the first duplexer 701 to the first antenna and the second duplexer 705 to the first antenna. The second switch 709 connects the third duplexer 708 to the second antenna and the third filter 713 to the second antenna.

[0168] The transmission path of the uplink signal of the first signal is: the first port 703, the first filter 711, the first switch 702, and the first antenna.

[0169] The main set receiving path of the downlink signal of the first signal is: the first antenna, the first switch 702, the second filter 721, and the second port 704. It can be seen that the transmission of the first signal and the main set receiving are both completed by the same antenna.

[0170] The diversity receiving path of the downlink signal of the first signal is: the second antenna, the second switch 709 , the third filter 713 , and the third port 714 .

[0171] The transmission path of the uplink signal of the third signal is: the fourth port 706, the fourth filter 715, the first switch 702, and the first antenna.

[0172] The main set receiving path of the downlink signal of the third signal is: the first antenna, the first switch 702, the fifth filter 725, and the fifth port 707. It can be seen that the transmission of the third signal and the main set receiving are both completed by the same antenna.

[0173] The diversity receiving path of the downlink signal of the third signal is: the second antenna, the second switch 709 , the seventh filter 728 , and the seventh port 712 .

[0174] In this way, ENDC of the first signal and the third signal is achieved.

[0175] It is explained again here that the premise for the RF module provided in the embodiment of the present application to realize two low-frequency ENDCs is that the bandwidth of the low-frequency antenna can cover these two low-frequency bands.

[0176] The above is the working principle of the RF circuit provided in the embodiment of the present application, which implements at least two low-frequency combination ENDCs through two low-frequency antennas. In practical applications, low frequencies also include frequency bands such as B5 and B26. Under the premise of meeting certain conditions, the transceiver links of these low-frequency signals can also be set in the RF circuit provided in the embodiment of the present application, which is described below.

[0177] In the embodiments of the present application, the low-frequency signal corresponding to the newly added transceiver link can be referred to as the fourth signal. The fourth signal does not overlap with the third signal. In this way, ENDC of the fourth and third signals can be achieved. For example, the first signal can be a signal in the B8 frequency band, the second signal can be a signal in the B20 frequency band, the third signal can be a signal in the B28 frequency band, and the fourth signal can be a signal in the B5 or B26 frequency band.

[0178] It should be understood that this is just an example description. The first signal, the second signal, the third signal, and the fourth signal can also be signals of other frequency bands as long as the relationship between the aforementioned signals is satisfied. This application does not make any specific limitations on this.

[0179] Please refer to Figure 11, which is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application. As shown in Figure 11, the radio frequency circuit further adds a fifth receiving link 1101 and a sixth transceiver link 1102 on the basis of the radio frequency circuit shown in Figure 6 above. The fifth receiving link 1101 is connected to the first antenna. The sixth transceiver link 1102 is connected to the second antenna. The fifth receiving link 1101 is used to perform diversity reception of the fourth signal through the first antenna. The sixth transceiver link 1102 is used to transmit the fourth signal and receive the main set of the fourth signal through the second antenna.

[0180] When the third signal and the fourth signal perform ENDC, the second transceiver link 602 transmits the third signal and performs primary reception of the third signal via the first antenna, and the third transceiver link 603 performs diversity reception of the third signal via the second antenna.

[0181] It should be understood that when the fourth signal does not overlap with the first signal and the bandwidth of the first antenna and the second antenna can cover the first and fourth signals, the RF circuit can also implement ENDC for the first and fourth signals. When the fourth signal and the second signal do not overlap and the bandwidth of the first antenna and the second antenna can cover the second and fourth signals, the RF circuit can also implement ENDC for the second and fourth signals. This will not be elaborated here.

[0182] The following describes a specific implementation of the radio frequency circuit shown in FIG11 .

[0183] Please refer to Figure 12, which is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application. As shown in Figure 12, the fifth receive chain includes an eighth filter 1201 and a first switch 702. The eighth filter 1201 is connected to the first switch 702 and the eighth port 1202, respectively. The passband of the eighth filter 1201 is the downlink frequency band of the fourth signal. The eighth port 1202 is a diversity receive port for the fourth signal.

[0184] The sixth transceiver link of the radio frequency circuit includes a fourth duplexer 1203 and a second switch 709. The fourth duplexer 1203 is configured to filter the uplink signal of the fourth signal and the downlink signal of the fourth signal. The fourth duplexer 1203 includes a ninth filter 1213 and a tenth filter 1223. The passband of the ninth filter 1213 is the uplink frequency band of the fourth signal. The passband of the tenth filter 1223 is the downlink frequency band of the fourth signal. A common port of the ninth filter 1213 and the tenth filter 1223 is connected to the second switch 709. The ninth filter 1213 is also connected to the ninth port 1204. The tenth filter 1223 is also connected to the tenth port 1205. The ninth port 1204 is the output port of the fourth signal, and the tenth port 1205 is the main set receiving port of the fourth signal.

[0185] Please refer to Figure 13, which is a schematic diagram of the operation of another RF circuit provided in an embodiment of the present application. As shown in Figure 13, when the third and fourth signals are performing ENDC, the first switch 702 connects the second duplexer 705 and the eighth filter 1201 to the first antenna, and the second switch 709 connects the third duplexer 708 and the fourth duplexer 1203 to the second antenna.

[0186] The transmission path of the uplink signal of the third signal is: the fourth port 706, the fourth filter 715, the first switch 702, and the first antenna.

[0187] The main set receiving path of the downlink signal of the third signal is: the first antenna, the first switch 702, the fifth filter 725, and the fifth port 707. It can be seen that the transmission of the third signal and the main set receiving are both completed by the same antenna.

[0188] The diversity receiving path of the downlink signal of the third signal is: the second antenna, the second switch 709 , the seventh filter 728 , and the seventh port 712 .

[0189] The transmission path of the uplink signal of the fourth signal is: the ninth port 1204, the ninth filter 1213, the second switch 709, and the second antenna.

[0190] The main set receiving path of the downlink signal of the fourth signal is: the second antenna, the second switch 709 , the tenth filter 1223 , and the tenth port 1205 .

[0191] The diversity receiving path of the downlink signal of the fourth signal is: the first antenna, the first switch 702 , the eighth filter 1201 , and the eighth port 1202 .

[0192] In this way, ENDC of the third signal and the fourth signal can be achieved.

[0193] The following description will be made again by taking the third signal being a signal in the B28 frequency band and the fourth signal being a signal in the N5 frequency band as an example. The same applies when the third signal is a signal in the N28 frequency band and the fourth signal is a signal in the B5 frequency band, and will not be described in detail here.

[0194] When the third signal is a signal of the B28 frequency band and the fourth signal is a signal of the N5 frequency band, the bandwidths of the first antenna and the second antenna should cover the B28 and N5 frequency bands.

[0195] The fourth port 706 is used to output the B28TX signal, and the passband of the fourth filter 715 is B28TX. The fifth port 707 is used for main set reception of the B28RX signal, and the passband of the fifth filter 725 is B28RX. The seventh port 712 is used for diversity reception of the B28RX signal, and the passband of the seventh filter 728 is B28RX. The ninth port 1204 is used to output the N5TX signal, and the passband of the ninth filter 1213 is N5TX. The tenth port 1205 is used for main set reception of the N5RX signal. The passband of the tenth filter 1223 is N5RX. The eighth port 1202 is used for diversity reception of the N5RX signal, and the passband of the eighth filter 1201 is N5RX.

[0196] The same applies when the fourth signal is the B26 signal or the N26 signal, and will not be further elaborated here.

[0197] It should be noted that the RF module provided in the embodiment of the present application may also include other low-frequency transceiver links. In other words, there may be multiple fifth and sixth transceiver links, each corresponding to a different low-frequency transceiver link, thereby enabling the RF circuit provided in the embodiment of the present application to support ENDCs with multiple low-frequency combinations.

[0198] In addition, in some possible designs, the connection relationship between the first switch, the second switch, the first antenna, and the second antenna can be adjustable. Please refer to Figure 14, which is a schematic diagram of another radio frequency circuit provided in an embodiment of the present application. As shown in Figure 14, based on the radio frequency circuit shown in Figure 12, the radio frequency circuit also includes a fourth switch 1401. The first switch 702 and the second switch 709 are both connected to the first antenna and the second antenna through the fourth switch 1401.

[0199] The fourth switch 1401 can connect the first switch 702 to the first antenna and the second switch 709 to the second antenna; or it can connect the first switch 702 to the second antenna and the second switch 709 to the first antenna. In this way, the RF path can be conveniently connected to different antennas when needed, which has better applicability.

[0200] The radio frequency circuit provided in the embodiments of the present application is introduced above. The embodiments of the present application also provide a radio frequency module, including the radio frequency circuit introduced in any of the above embodiments, which will be described in detail below.

[0201] Please refer to Figure 15, which is a schematic diagram of a radio frequency module provided in an embodiment of the present application. As shown in Figure 15, the radio frequency module includes: the radio frequency circuit described in any of the above embodiments (the radio frequency circuit in Figure 15 is the radio frequency circuit shown in Figure 14), a first antenna 1501, a second antenna 1502, a signal output module 1503, a signal receiving module 1504 and a third switch 1505. The signal output module 1503 is connected to the radio frequency circuit through the third switch. The signal output module 1503 is respectively connected to the first port 703, the fourth port 706, the sixth port 710, and the ninth port 1204. The signal output module is used to output a low-frequency signal, and the low-frequency signal includes at least: a first signal, a second signal, a third signal, and a fourth signal. The signal receiving module is respectively connected to the second port 704, the fifth port 707, the seventh port 712, the third port 714, the eighth port 1202 and the tenth port 1205. The signal receiving module is used to receive a low-frequency signal.

[0202] The signal output module 1503 may include a low frequency signal source, a power amplifier, etc. After the low frequency signal is output by the signal source, it is amplified by the corresponding power amplifier and then input to the first port 703, the fourth port 706, the sixth port 710, the ninth port 1204, etc.

[0203] The signal receiving module may include components such as a low noise amplifier, etc. Signals received by the second port 704, the fifth port 707, the seventh port 712, the third port 714, the eighth port 1202 and the tenth port 1205 may be received after passing through corresponding low noise amplifiers.

[0204] The RF module can implement ENDC with at least two low-frequency combinations, as exemplified below.

[0205] When the first signal and the second signal perform ENDC, the third switch 1505 can connect the signal output module 1503 to the first port 703 and the sixth port 710, and disconnect the signal output module from other ports.

[0206] When the second signal and the third signal perform ENDC, the third switch can connect the signal output module 1503 to the fourth port 706 and the sixth port 710, and disconnect the signal output module from other ports.

[0207] When the third signal and the fourth signal perform ENDC, the third switch can connect the signal output module 1503 to the fourth port 1706 and the ninth port 1204, and disconnect the signal output module from other ports.

[0208] Other combinations of ENDC are similar and will not be described here.

[0209] Based on the above introduction, it can be understood that the RF circuit and RF module provided in the embodiments of the present application can realize ENDC of at least two low-frequency combinations through two low-frequency antennas, and have high practicality.

[0210] An embodiment of the present application also provides an electronic device, which may include the radio frequency circuit or radio frequency module described in any of the above embodiments.

[0211] The RF circuit and RF module provided by the present application are described above in combination with specific features and embodiments thereof. Obviously, various modifications and combinations of the above features can be made without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, changes, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A radio frequency circuit, characterized in that: include: a first transceiver link, a second transceiver link, a third transceiver link, and a fourth receive link; The first transceiver link and the second transceiver link are both connected to the first antenna; The third transceiver link and the fourth receive link are both connected to the second antenna; the first antenna and the second antenna are both low-frequency antennas; The first transceiver link is used to transmit a first signal and receive a main set of the first signal through the first antenna; the second transceiver link is used to transmit a third signal, receive a main set of the third signal, and receive a diversity signal through the first antenna; the first signal, the second signal, and the third signal are all low-frequency signals; only a downlink frequency band of the second signal overlaps with the third signal, and overlaps with the downlink frequency band of the third signal; the first signal does not overlap with the second signal or the third signal; the distance between the uplink frequency band of the first signal and the uplink frequency band of the second signal is less than the distance between the uplink frequency band of the first signal and the uplink frequency band of the third signal; The third transceiver link is used for transmitting the second signal, receiving a main set of the second signal, and receiving a diversity set of the third signal through the second antenna; The fourth receiving chain is used to perform diversity reception of the first signal through the second antenna.

2. The radio frequency circuit according to claim 1, wherein: The first transceiver link includes a first duplexer and a first switch; the first duplexer is used to filter the uplink signal and the downlink signal of the first signal; wherein the uplink signal of the first signal refers to the signal of the uplink frequency band of the first signal, and the downlink signal of the first signal refers to the signal of the downlink frequency band of the first signal; The first duplexer is connected to the first port, the second port and the first switch respectively; the first switch is connected to the first antenna; wherein the first port is the output port of the first signal, and the second port is the main set receiving port of the first signal; When the first switch connects the first duplexer to the first antenna, the uplink signal of the first signal is output by the first port, passes through the first duplexer and the first switch in sequence, and is then transmitted through the first antenna; after the downlink signal of the first signal is received by the first antenna, it passes through the first switch and the first duplexer in sequence, and is then received by the second port.

3. The radio frequency circuit according to claim 2, characterized in that: The first duplexer includes a first filter and a second filter; A common port of the first filter and the second filter is connected to the first switch; the first filter is also connected to the first port; and the second filter is also connected to the second port. The passband of the first filter is the uplink frequency band of the first signal; the passband of the second filter is the downlink frequency band of the first signal; When the first switch connects the first duplexer to the first antenna, the uplink signal of the first signal is output by the first port, passes through the first filter and the first switch in sequence, and is then transmitted through the first antenna; the downlink signal of the first signal is received by the first antenna, passes through the first switch and the second filter in sequence, and is then received by the second port.

4. The radio frequency circuit according to claim 1, wherein: The fourth receiving chain includes a third filter and a second switch; The third filter is connected to the second switch and the third port respectively; the second switch is connected to the second antenna; the third port is a diversity receiving port for the third signal; The passband of the third filter is the downlink frequency band of the third signal; When the second switch connects the third filter to the second antenna, the downlink signal of the third signal is received by the second antenna, passes through the second switch and the third filter in sequence, and is then received in diversity by the third port; wherein the downlink signal of the third signal refers to the signal of the downlink frequency band of the third signal.

5. The radio frequency circuit according to claim 1, wherein: The second transceiver link includes a second duplexer and a first switch; the second duplexer is used to filter the uplink signal of the third signal, the downlink signal of the third signal, and the downlink signal of the second signal; wherein the uplink signal of the third signal refers to a signal of the uplink frequency band of the third signal, the downlink signal of the third signal refers to a signal of the downlink frequency band of the third signal, and the downlink signal of the second signal refers to a signal of the downlink frequency band of the second signal; The second duplexer is connected to the fourth port, the fifth port and the first switch respectively; the first switch is connected to the first antenna; wherein the fourth port is an output port of the third signal, and the fifth port is a main set receiving port of the third signal and a diversity receiving port of the second signal; When the first switch connects the second duplexer to the first antenna, the uplink signal of the third signal is output by the fourth port, passes through the second duplexer and the first switch in sequence, and is then transmitted through the first antenna; the downlink signal of the third signal is received by the first antenna, passes through the first switch and the second duplexer in sequence, and is then received by the fifth port to complete the main set; the downlink signal of the second signal is received by the first antenna, passes through the first switch and the second duplexer in sequence, and is then received by the fifth port to complete the diversity reception.

6. The radio frequency circuit according to claim 5, characterized in that: The second duplexer includes a fourth filter and a fifth filter; A common port of the fourth filter and the fifth filter is connected to the first switch; the fourth filter is also connected to the fourth port; and the fifth filter is also connected to the fifth port. The passband of the fourth filter is the uplink frequency band of the third signal; the passband of the fifth filter is the downlink frequency band of the third signal and the downlink frequency band of the second signal; When the first switch connects the second duplexer to the first antenna, the uplink signal of the third signal is output by the fourth port, passes through the fourth filter in sequence, and then is transmitted through the first switch after the first switch is switched. The downlink signal of the third signal is received by the first antenna, passes through the first switch in sequence, passes through the fifth filter, and then is received by the fifth port to complete the main set reception. The downlink signal of the second signal is received by the first antenna, passes through the first switch in sequence, passes through the fifth filter, and then is received by the fifth port to complete the diversity reception.

7. The radio frequency circuit according to claim 1, characterized in that: The third transceiver link includes a third duplexer and a second switch; the third duplexer is used to filter the uplink signal of the second signal, the downlink signal of the second signal, and the downlink signal of the third signal; wherein the uplink signal of the second signal refers to the signal of the uplink frequency band of the second signal, the downlink signal of the second signal refers to the signal of the downlink frequency band of the second signal, and the downlink signal of the third signal refers to the signal of the downlink frequency band of the third signal; The third duplexer is connected to the sixth port, the seventh port, and the second switch respectively; the second switch is connected to the second antenna; wherein the sixth port is an output port of the second signal, and the seventh port is a main set receiving port of the second signal and a diversity receiving port of the third signal; When the second switch connects the third duplexer to the second antenna, the uplink signal of the second signal is output by the sixth port, passes through the third duplexer and the second switch in sequence, and is then transmitted through the second antenna; the downlink signal of the second signal is received by the second antenna, passes through the second switch and the third duplexer in sequence, and is then received by the seventh port to complete the main set reception; the downlink signal of the third signal is received by the second antenna, passes through the second switch and the third duplexer in sequence, and is then received by the seventh port to complete the diversity reception.

8. The radio frequency circuit according to claim 7, characterized in that: The third duplexer includes a sixth filter and a seventh filter; A common port of the sixth filter and the seventh filter is connected to the second switch; the sixth filter is also connected to the sixth port; and the seventh filter is also connected to the seventh port. The passband of the sixth filter is the uplink frequency band of the second signal; the passband of the seventh filter is the downlink frequency band of the second signal and the downlink frequency band of the third signal; When the second switch connects the third duplexer to the second antenna, the uplink signal of the second signal is output by the sixth port, passes through the sixth filter in sequence, and then is transmitted through the second switch after the second switch; the downlink signal of the second signal is received by the second antenna, passes through the second switch in sequence, passes through the seventh filter, and then is received by the seventh port to complete the main set; the downlink signal of the third signal is received by the second antenna, passes through the second switch in sequence, passes through the seventh filter, and then is received by the seventh port to complete the diversity reception.

9. The radio frequency circuit according to claim 1, characterized in that: When the first signal and the second signal perform ENDC, the first transceiver link, the second transceiver link, the third transceiver link, and the fourth receiving link are all connected; when the second signal and the third signal perform ENDC, the second transceiver link and the third transceiver link are connected, and the first transceiver link and the fourth receiving link are disconnected.

10. The radio frequency circuit according to claim 1, characterized in that: The radio frequency circuit further includes: a fifth receiving link and a sixth transmitting and receiving link; The fifth receiving link is connected to the first antenna; the sixth transmitting and receiving link is connected to the second antenna; The fifth receiving link is used to perform diversity reception of the fourth signal through the first antenna; the sixth transceiver link is used to transmit the fourth signal and perform main set reception of the fourth signal through the second antenna; the fourth signal has no overlap with the third signal.

11. The radio frequency circuit according to claim 10, characterized in that: The fifth receiving chain includes an eighth filter and a first switch; The eighth filter is connected to the first switch and the eighth port respectively; the first switch is also connected to the first antenna; the eighth port is a diversity receiving port for the fourth signal; The passband of the eighth filter is the downlink frequency band of the fourth signal; When the first switch connects the eighth filter to the first antenna, the downlink signal of the fourth signal is received by the first antenna, passes through the first switch and the eighth filter in sequence, and is then received in diversity by the eighth port; wherein the downlink signal of the fourth signal refers to the signal of the downlink frequency band of the fourth signal.

12. The radio frequency circuit according to claim 10, characterized in that: The sixth transceiver link includes a fourth duplexer and a second switch; the fourth duplexer is used to filter the uplink signal of the fourth signal and the downlink signal of the fourth signal; wherein the uplink signal of the fourth signal refers to a signal of the uplink frequency band of the fourth signal, and the downlink signal of the fourth signal refers to a signal of the downlink frequency band of the fourth signal; The fourth duplexer is connected to the ninth port, the tenth port, and the second switch respectively; the second switch is connected to the second antenna; wherein the ninth port is an output port of the fourth signal, and the tenth port is a main set receiving port of the fourth signal; When the second switch connects the fourth duplexer to the second antenna, the uplink signal of the fourth signal is output by the ninth port, passes through the fourth duplexer in sequence, and then is transmitted through the second antenna after the second switch; the downlink signal of the fourth signal is received by the second antenna, passes through the second switch in sequence, then is transmitted through the fourth duplexer, and then is received by the tenth port.

13. The radio frequency circuit according to claim 12, characterized in that: The fourth duplexer includes a ninth filter and a tenth filter; A common port of the ninth filter and the tenth filter is connected to the second switch; the ninth filter is also connected to the ninth port; and the tenth filter is also connected to the tenth port. The passband of the ninth filter is the uplink frequency band of the fourth signal; the passband of the tenth filter is the downlink frequency band of the fourth signal; When the second switch connects the fourth duplexer to the second antenna, the uplink signal of the fourth signal is output by the ninth port, passes through the ninth filter in sequence, and is then transmitted through the second switch; the downlink signal of the fourth signal is received by the second antenna, passes through the second switch in sequence, is then filtered, and is then received by the tenth port.

14. A radio frequency module, characterized in that: The radio frequency module comprises: the radio frequency circuit according to any one of claims 1 to 13, a first antenna, a second antenna, a signal output module and a signal receiving module; The first transceiver link and the second transceiver link in the radio frequency circuit are both connected to the first antenna; the third transceiver link and the fourth receive link in the radio frequency circuit are both connected to the second antenna; The signal output module is connected to the first transceiver link, the second transceiver link and the third transceiver link respectively; the signal output module is used to output a low-frequency signal, and the low-frequency signal includes at least: a first signal, a second signal, and a third signal; The signal receiving module is connected to the first transceiver link, the second transceiver link, the third transceiver link and the fourth receiving link respectively; the signal receiving module is used to receive the low-frequency signal.

15. The radio frequency module according to claim 14, wherein: The radio frequency module further includes a third switch; The signal output module is connected to the radio frequency circuit via the third switch; The third switch is configured to connect the signal output module to the first transceiver link and the third transceiver link, and disconnect the signal output module from the second transceiver link, when the first signal and the second signal perform ENDC; The third switch is further configured to connect the signal output module to the second transceiver link and the third transceiver link, and disconnect the signal output module from the first transceiver link when the second signal and the third signal perform ENDC.

16. An electronic device, characterized in that: The electronic device includes the radio frequency circuit according to any one of claims 1-13 or the radio frequency module according to any one of claims 14-15.

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