Radio frequency front-end circuit, radio frequency circuit and electronic device

Abstract

This application discloses a radio frequency (RF) front-end circuit, an RF circuit, and an electronic device, belonging to the field of electronic technology. The RF front-end circuit includes: a first duplexer, with a first end connected to a transmit channel of a first frequency band and a second end connected to a main receive channel of the first frequency band; a first signal processing device, with a first end connected to a third end of the first duplexer and a second end connected to a diversity receive channel of a second frequency band, the first signal processing device being used to split signals; a first antenna connected to the third end of the first signal processing device; a second duplexer, with a first end connected to a transmit channel of the second frequency band and a second end connected to a main receive channel of the second frequency band; a second signal processing device, with a first end connected to the third end of the second duplexer and a second end connected to a diversity receive channel of the first frequency band, the second signal processing device being used to split signals; and a second antenna connected to the third end of the second signal processing device.

Description

Technical Field

[0001] This application belongs to the field of electronic technology, specifically relating to a radio frequency front-end circuit, radio frequency circuit, and electronic device. Background Technology

[0002] Carrier Aggregation (CA) and End-to-End Connectivity (ENDC) are key technologies for 4G+ and 5G. CA bundles carriers from multiple frequency bands to improve the transmission rate of a single network, while End-to-End Connectivity utilizes 4G to supplement coverage when 5G coverage is insufficient, achieving seamless switching to improve speed and stability.

[0003] Furthermore, there is demand for CA / ENDC combinations of LB (Low Band) + LB in global network coverage.

[0004] However, the frequency range of LB is less than 1 GHz. Due to the low frequency, a larger antenna size is required, and terminals are generally limited to only two antennas due to size constraints. Furthermore, to achieve a CA & ENDC combination of LB+LB on two antennas, a special duplexer design is needed. Special duplexers are expensive, increasing the design cost of CA & ENDC combinations. Moreover, the relatively wide bandwidth of the low-frequency band and the small frequency spacing between bands mean that only some LB+LB combinations can implement special duplexer designs. In other words, CA & ENDC combinations can only support LBs with readily available special duplexers, resulting in low coverage of low-frequency band combinations. Utility Model Content

[0005] The purpose of this application is to provide a radio frequency front-end circuit, radio frequency circuit, and electronic device that can realize CA & ENDC combination on two antennas without using a special duplexer, and can improve the coverage of the low-frequency band combination.

[0006] In a first aspect, embodiments of this application provide a radio frequency front-end circuit, comprising: a first duplexer, a first end of which is connected to a transmit channel of a first frequency band, and a second end of which is connected to a main receive channel of the first frequency band; a first signal processing device, a first end of which is connected to a third end of the first duplexer, and a second end of which is connected to a diversity receive channel of a second frequency band, wherein the first signal processing device is used to split signals; a first antenna connected to the third end of the first signal processing device; a second duplexer, a first end of which is connected to the transmit channel of the second frequency band, and a second end of which is connected to the main receive channel of the second frequency band; a second signal processing device, a first end of which is connected to the third end of the second duplexer, and a second end of which is connected to the diversity receive channel of the first frequency band, wherein the second signal processing device is used to split signals; and a second antenna connected to the third end of the second signal processing device.

[0007] Secondly, embodiments of this application provide a radio frequency circuit, including: a radio frequency front-end circuit according to the first aspect; and a transceiver connected to the radio frequency front-end circuit.

[0008] Thirdly, embodiments of this application provide an electronic device, including: the radio frequency circuit of the second aspect.

[0009] The radio frequency front-end circuit provided in this application includes a first duplexer, a first signal processing device, a first antenna, a second duplexer, a second signal processing device, and a second antenna. The first end of the first duplexer is connected to the transmit channel of a first frequency band, and the second end of the first duplexer is connected to the main receive channel of the first frequency band. The first end of the first signal processing device is connected to the third end of the first duplexer, and the second end of the first signal processing device is connected to the diversity receive channel of a second frequency band; the first signal processing device is used to split the signal. The first antenna is connected to the third end of the first signal processing device. The first end of the second duplexer is connected to the transmit channel of the second frequency band, and the second end of the second duplexer is connected to the main receive channel of the second frequency band. The first end of the second signal processing device is connected to the third end of the second duplexer, and the second end of the second signal processing device is connected to the diversity receive channel of the first frequency band; the second signal processing device is used to split the signal. The second antenna is connected to the third end of the second signal processing device. By adding a first signal processing device and a second signal processing device to the first and second antennas, respectively, and cooperating with the first and second duplexers, CA and ENDC of the first and second frequency bands can be achieved. In this way, no special duplexer design is required; by using signal processing devices in conjunction with ordinary duplexers, CA and ENDC of any LB+LB combination can be achieved based on two antennas. This reduces the design cost of CA & ENDC combinations while improving the coverage of low-frequency band combinations. Attached Figure Description

[0010] Figure 1 This is one of the structural schematic diagrams of the radio frequency front-end circuit provided in the embodiments of this application;

[0011] Figure 2 This is one of the structural schematic diagrams of radio frequency front-end circuits in related technologies;

[0012] Figure 3 One of the simulation result diagrams of the radio frequency front-end circuit provided in the embodiments of this application;

[0013] Figure 4 The second simulation result diagram of the radio frequency front-end circuit provided in the embodiments of this application;

[0014] Figure 5 The third simulation result diagram of the radio frequency front-end circuit provided in the embodiments of this application;

[0015] Figure 6 This is the second schematic diagram of the structure of the radio frequency front-end circuit provided in the embodiments of this application;

[0016] Figure 7 This is the second schematic diagram of the structure of the radio frequency front-end circuit in related technologies;

[0017] Figure 8 Figure 4 shows the simulation results of the radio frequency front-end circuit provided in the embodiments of this application;

[0018] Figure 9 Figure 5 shows the simulation results of the radio frequency front-end circuit provided in the embodiments of this application;

[0019] Figure 10 This is a structural block diagram of the radio frequency circuit provided in the embodiments of this application;

[0020] Figure 11 A structural block diagram of an electronic device provided in an embodiment of this application.

[0021] Figure label:

[0022] 100 RF front-end circuit, 102 First duplexer, 104 First signal processing device, 106 First antenna, 108 Second duplexer, 110 Second signal processing device, 112 Second antenna, 114 First filter, 116 Second filter, 118 Third signal processing device, 120 Fourth signal processing device. Detailed Implementation

[0023] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The following is combined Figures 1-11 The radio frequency front-end circuit, radio frequency circuit, and electronic device according to embodiments of this application are described in detail.

[0027] like Figure 1 As shown, this application embodiment provides a radio frequency front-end circuit 100. The radio frequency front-end circuit 100 includes a first duplexer 102, a first signal processing device 104, a first antenna 106, a second duplexer 108, a second signal processing device 110, and a second antenna 112.

[0028] The first end of the first duplexer 102 is connected to the TX (Transmit) channel of the first frequency band LB1, and the second end of the first duplexer 102 is connected to the PRX (Primary Receive) channel of the first frequency band LB1.

[0029] That is, the first duplexer 102 is used to process the TX signal of the first frequency band LB1 and the PRX signal of the first frequency band LB1.

[0030] Specifically, the first duplexer 102 is used to isolate the TX signal and the PRX signal of the first frequency band LB1 to realize the transmit and receive operations on the first antenna 106.

[0031] Furthermore, the first terminal of the first signal processing device 104 is connected to the third terminal of the first duplexer 102, and the second terminal of the first signal processing device 104 is connected to the DRX (Diversity Receive) channel of the second frequency band LB2.

[0032] Furthermore, the first antenna 106 is connected to the third terminal of the first signal processing device 104.

[0033] The first signal processing device 104 is used to split the signal.

[0034] Specifically, when the first antenna 106 receives a signal, the first signal processing device 104 is used to split the signal fed back by the first antenna 106 into two signals, and transmit them to the first duplexer 102 and the DRX channel of the second frequency band LB2 respectively.

[0035] Based on this, the CA & ENDC combination of LB1 TX + LB1 PRX + LB2 DRX can be realized on the first antenna 106.

[0036] Furthermore, the first end of the second duplexer 108 is connected to the TX channel, i.e., the transmit channel, of the second frequency band LB2, and the second end of the second duplexer 108 is connected to the PRX channel, i.e., the main receive channel, of the second frequency band LB2.

[0037] That is, the second duplexer 108 is used to process the TX signal of the second frequency band LB2 and the PRX signal of the second frequency band LB2.

[0038] Specifically, the second duplexer 108 is used to isolate the TX signal of the second frequency band LB2 and the PRX signal of the second frequency band LB2 in order to realize the transmit and receive operations on the second antenna 112.

[0039] Furthermore, the first end of the second signal processing device 110 is connected to the third end of the second duplexer 108, and the second end of the second signal processing device 110 is connected to the DRX channel of the first frequency band LB1, i.e., the diversity reception channel.

[0040] Furthermore, the second antenna 112 is connected to the third terminal of the second signal processing device 110.

[0041] The second signal processing device 110 is used to split the signal.

[0042] Specifically, when the second antenna 112 receives a signal, the second signal processing device 110 is used to split the one signal fed back by the second antenna 112 into two signals, and transmit them to the second duplexer 108 and the DRX channel of the first frequency band LB1, respectively.

[0043] Based on this, the CA & ENDC combination of LB2 TX+LB2 PRX+LB1 DRX can be realized on the second antenna 112.

[0044] Understandably, in conventional designs, such as Figure 2 As shown, in order to perform LB+LB CA&ENDC combination on two antennas, special duplexers need to be designed, such as B20TX+B20 / B28RX duplexers and B28TX+B20 / B28RX duplexers, which have high design costs. In addition, CA&ENDC combination can only support LB frequency bands with readily available special duplexers, and the coverage of low frequency band combination is low.

[0045] The radio frequency front-end circuit 100 of this application embodiment achieves CA and ENDC of the combination of the first frequency band LB1 and the second frequency band LB2 on the first antenna 106 by adding a first signal processing device 104 and cooperating with the first duplexer 102, and achieves CA and ENDC of the combination of the first frequency band LB1 and the second frequency band LB2 on the second antenna 112 by adding a second signal processing device 110 and cooperating with the second duplexer 108.

[0046] In other words, the RF front-end circuit 100 of this application embodiment does not require the design of a special duplexer. By using signal processing devices in conjunction with a common duplexer, it can achieve CA and ENDC for any LB+LB combination based on two antennas. This enhances the network support capability of the terminal and improves its competitiveness. Compared with the CA&ENDC combination scheme using a special duplexer, it reduces the design cost of the CA&ENDC combination, improves the coverage of the low-frequency band combination, and reduces the size restrictions on the terminal by using only two antennas.

[0047] For example, taking the combination of two low-frequency bands, B5 (classic low-frequency band, 850MHz) and B8 (classic low-frequency band, 900MHz), as an example, B5 is designed as LB1 and B8 as LB2. For the first antenna 106, the S-parameters of the LB1TX channel to the first antenna 106, the LB1PRX channel to the first antenna 106, and the LB2DRX channel to the first antenna 106 are as follows: Figures 3 to 5 As shown. The S-parameters, also known as scattering parameters, are a set of complex parameters used to describe how high-frequency signals are transmitted and reflected in a linear network. Figure 3 The reverse transmission coefficient from the LB1 TX channel to the first antenna 106 is... Figure 4 The reverse transmission coefficient from the LB1 PRX channel to the first antenna 106, Figure 5 This is the forward transmission coefficient from the LB2 DRX channel to the first antenna 106.

[0048] The radio frequency front-end circuit 100 according to an embodiment of this application includes a first duplexer 102, a first signal processing device 104, a first antenna 106, a second duplexer 108, a second signal processing device 110, and a second antenna 112. The first end of the first duplexer 102 is connected to the transmit channel of the first frequency band, and the second end of the first duplexer 102 is connected to the main receive channel of the first frequency band; the first end of the first signal processing device 104 is connected to the third end of the first duplexer 102, and the second end of the first signal processing device 104 is connected to the diversity receive channel of the second frequency band, and the first signal processing device 104 is used to split the signal; the first antenna 106 is connected to the third end of the first signal processing device 104; the first end of the second duplexer 108 is connected to the transmit channel of the second frequency band, and the second end of the second duplexer 108 is connected to the main receive channel of the second frequency band; the first end of the second signal processing device 110 is connected to the third end of the second duplexer 108, and the second end of the second signal processing device 110 is connected to the diversity receive channel of the first frequency band, and the second signal processing device 110 is used to split the signal; the second antenna 112 is connected to the third end of the second signal processing device 110. By adding a first signal processing device 104 and a second signal processing device 110 to the first antenna 106 and the second antenna 112, respectively, and cooperating with the first duplexer 102 and the second duplexer 108, the CA and ENDC of the first and second frequency bands can be realized through the RF front-end circuit 100 described above. In this way, without designing a special duplexer, CA and ENDC of any LB+LB combination can be realized based on two antennas by using signal processing devices in conjunction with ordinary duplexers. This reduces the design cost of CA & ENDC combinations while improving the coverage of low-frequency band combinations.

[0049] According to some embodiments of this application, optionally, such as Figure 1 As shown, the RF front-end circuit 100 also includes a first filter 114 and a second filter 116.

[0050] The first filter 114 is connected to the second terminal of the first signal processing device 104 and the DRX channel of the second frequency band LB2, i.e., the diversity reception channel.

[0051] The first filter 114 is a filter for the second frequency band LB2. The first filter 114 is used to allow the signal of the second frequency band LB2 to pass through while suppressing the signal of other frequency bands. In this way, interference from other signals to the signal of the second frequency band LB2 can be suppressed, achieving signal isolation of the second frequency band LB2 and improving the reliability of implementing low-frequency CA and ENDC on the first antenna 106.

[0052] Furthermore, the second filter 116 is connected to the second terminal of the second signal processing device 110 and the DRX channel, i.e., the diversity reception channel, of the first frequency band LB1.

[0053] The second filter 116 is a filter for the first frequency band LB1. The second filter 116 is used to allow the signal of the first frequency band LB1 to pass through while suppressing the signal of other frequency bands to pass through. In this way, interference from other signals to the signal of the first frequency band LB1 can be suppressed, achieving signal isolation of the first frequency band LB1 and improving the reliability of implementing low-frequency CA and ENDC on the second antenna 112.

[0054] The RF front-end circuit 100 according to an embodiment of this application further includes a first filter 114 and a second filter 116. The first filter 114 is connected to both the second terminal of the first signal processing device 104 and the diversity reception channel of the second frequency band; the second filter 116 is connected to both the second terminal of the second signal processing device 110 and the diversity reception channel of the first frequency band. In this way, the filters enable selective passage of low-frequency signals, suppressing interference from other frequency band signals on the desired low-frequency signals, achieving isolation of the desired low-frequency signals, and improving the reliability of low-frequency CA and ENDC.

[0055] According to some embodiments of this application, optionally, such as Figure 6 As shown, the RF front-end circuit 100 also includes a third signal processing device 118 and a fourth signal processing device 120.

[0056] The first terminal of the third signal processing device 118 is connected to the PRX channel (main receiving channel) of the first frequency band LB1 and the DRX channel (diversity receiving channel) of the second frequency band LB2. The second terminal of the third signal processing device 118 is connected to the second terminal of the first duplexer 102. The third terminal of the third signal processing device 118 is connected to the first filter 114.

[0057] The third signal processing device 118 is used to merge signals.

[0058] Specifically, when the first antenna 106 receives a signal, the third signal processing device 118 is used to combine the PRX signal of the first frequency band LB1 output by the first duplexer 102 with the DRX signal of the second frequency band LB2 output by the first filter 114 into one channel.

[0059] At this time, the PRX channel of the first frequency band LB1, i.e. the main receiving channel, and the DRX channel of the second frequency band LB2, i.e. the diversity receiving channel, are the same channel, and they use the same port of the transceiver.

[0060] Furthermore, the first terminal of the fourth signal processing device 120 is connected to the PRX channel (main receiving channel) of the second frequency band LB2 and the DRX channel (diversity receiving channel) of the first frequency band LB1. The second terminal of the fourth signal processing device 120 is connected to the second terminal of the second duplexer 108. The third terminal of the fourth signal processing device 120 is connected to the second filter 116.

[0061] The fourth signal processing device 120 is used to merge signals.

[0062] Specifically, when the second antenna 112 receives a signal, the fourth signal processing device 120 is used to combine the PRX signal of the second frequency band LB2 output by the second duplexer 108 with the DRX signal of the first frequency band LB1 output by the second filter 116 into one channel.

[0063] At this time, the PRX channel of the second frequency band LB2, i.e. the main receiving channel, and the DRX channel of the first frequency band LB1, i.e. the diversity receiving channel, are the same channel, and they use the same port of the transceiver.

[0064] It is understandable that in related technologies, such as Figure 7 As shown, a CA&ENDC combination of LB+LB can also be implemented based on four antennas. Specifically, LB1 TX+PRX uses antenna 1, LB2 DRX uses antenna 2, LB2 TX+PRX uses antenna 3, and LB1DRX uses antenna 4. By occupying two antennas for each frequency band, an arbitrary LB+LB CA&ENDC scheme can be achieved. However, the above four-antenna CA&ENDC scheme requires more space to install the antennas, limiting its implementation to large-size terminals.

[0065] The radio frequency front-end circuit 100 of this application embodiment combines the PRX signal of the first frequency band LB1 and the DRX signal of the second frequency band LB2 through the third signal processing device 118, and combines the PRX signal of the second frequency band LB2 and the DRX signal of the first frequency band LB1 through the fourth signal processing device 120, thereby expanding the low frequency band combination range and being consistent with the antenna switching of the special duplexer scheme.

[0066] In other words, the RF front-end circuit 100 of this application embodiment, by adding signal processing devices, filters, and duplexers, achieves the same support capability as the four-antenna CA&ENDC scheme, enabling arbitrary LB+LB combinations. This enhances the terminal's network support capabilities, improves its competitiveness, and reduces the number of transceiver ports used.

[0067] For example, taking the combination of two low-frequency bands B5 and B8 as an example, B5 is designed as LB1 and B8 as LB2. For the first antenna 106, the S-parameters of the LB1 PRX channel + LB2 DRX channel to the first antenna 106 and the LB1TX channel to the first antenna 106 are as follows: Figure 8 and Figure 9 As shown. Among them, Figure 8 The reverse transmission coefficient from LB1 PRX channel + LB2 DRX channel to the first antenna 106. Figure 9 This is the reverse transmission coefficient from the LB1 TX channel to the first antenna 106.

[0068] According to the RF front-end circuit 100 of the embodiments of this application, the RF front-end circuit 100 further includes a third signal processing device 118 and a fourth signal processing device 120. The first terminal of the third signal processing device 118 is connected to both the main receiving channel of the first frequency band and the diversity receiving channel of the second frequency band; the second terminal of the third signal processing device 118 is connected to the second terminal of the first duplexer 102; and the third terminal of the third signal processing device 118 is connected to the first filter 114. The third signal processing device 118 is used for signal combining. The first terminal of the fourth signal processing device 120 is connected to both the main receiving channel of the second frequency band and the diversity receiving channel of the first frequency band; the second terminal of the fourth signal processing device 120 is connected to the second terminal of the second duplexer 108; and the third terminal of the fourth signal processing device 120 is connected to the second filter 116. The fourth signal processing device 120 is used for signal combining. In this way, without increasing the space occupied, the same support capability as the four-antenna CA&ENDC scheme is achieved, the low-frequency band combination range is expanded, and the number of transceiver ports used is reduced.

[0069] According to some embodiments of this application, optionally, such as Figure 1 and Figure 6 As shown, the first signal processing device 104 is a combiner or a power divider.

[0070] In the radio frequency front-end circuit 100 of this application embodiment, the first signal processing device 104 may be a combiner.

[0071] Specifically, when the combiner operates in the forward direction, that is, when the combiner operates in the downlink range, the combiner is used to combine multiple signals and transmit them through a single antenna. When the combiner operates in the reverse direction, that is, when the combiner operates in the uplink range, the combiner is used to separate the signals received by the antenna according to frequency and transmit them separately.

[0072] In the radio frequency front-end circuit 100 of this application embodiment, when the combiner is used as the first signal processing device 104, the combiner is used to split the signal fed back by the first antenna 106 into two signals when the first antenna 106 receives the signal, and transmit them to the first duplexer 102 and the DRX channel of the second frequency band LB2 respectively.

[0073] In the radio frequency front-end circuit 100 of this application embodiment, the first signal processing device 104 may also be a power divider.

[0074] When the power divider is operating in the forward direction, it is used to divide the energy of one input signal into multiple outputs. When the power divider is operating in the reverse direction, it is used to combine multiple signals into one output.

[0075] In the radio frequency front-end circuit 100 of this application embodiment, when the power divider is used as the first signal processing device 104, the power divider is used to split the signal fed back by the first antenna 106 into two signals when the first antenna 106 receives the signal, and transmit them to the first duplexer 102 and the DRX channel of the second frequency band LB2 respectively.

[0076] According to the RF front-end circuit 100 of this application embodiment, the first signal processing device 104 is a combiner or a power divider. In this way, without designing a special duplexer, the CA and ENDC of any LB+LB combination can be realized on the first antenna 106 by using the combiner or power divider in conjunction with a common duplexer.

[0077] According to some embodiments of this application, optionally, such as Figure 1 and Figure 6 As shown, the second signal processing device 110 is a combiner or a power divider.

[0078] In the radio frequency front-end circuit 100 of this application embodiment, the second signal processing device 110 may be a combiner.

[0079] When the combiner is used as the second signal processing device 110, the combiner is used to split the signal fed back by the second antenna 112 into two signals when the second antenna 112 receives the signal, and transmit them to the second duplexer 108 and the DRX channel of the first frequency band LB1 respectively.

[0080] In the radio frequency front-end circuit 100 of this application embodiment, the second signal processing device 110 may also be a power divider.

[0081] When the power divider is used as the first signal processing device 104, the power divider is used to split the signal fed back by the second antenna 112 into two signals when the second antenna 112 receives the signal, and transmit them to the second duplexer 108 and the DRX channel of the first frequency band LB1 respectively.

[0082] According to the RF front-end circuit 100 of the embodiments of this application, the second signal processing device 110 is a combiner or a power divider. In this way, without the need to design a special duplexer, the CA and ENDC of any LB+LB combination can be realized on the second antenna 112 by using the combiner or power divider in conjunction with a normal duplexer.

[0083] According to some embodiments of this application, optionally, such as Figure 6 As shown, the third signal processing device 118 is a combiner or a power divider.

[0084] In the radio frequency front-end circuit 100 of this application embodiment, the third signal processing device 118 may be a combiner.

[0085] When the combiner is used as the third signal processing device 118, the combiner is used to combine the PRX signal of the first frequency band LB1 and the DRX signal of the second frequency band LB2 into one channel when the first antenna 106 receives the signal.

[0086] In the radio frequency front-end circuit 100 of this application embodiment, the third signal processing device 118 may also be a power divider.

[0087] When the power divider is used as the first signal processing device 104, the power divider is used to combine the PRX signal of the first frequency band LB1 and the DRX signal of the second frequency band LB2 into one channel when the first antenna 106 receives the signal.

[0088] According to the RF front-end circuit 100 of this application embodiment, the third signal processing device 118 is a combiner or a power divider. In this way, by adding a combiner or power divider in conjunction with a filter and a duplexer, the low-frequency band combination range of the first antenna 106 is expanded, and the number of transceiver ports used is reduced.

[0089] According to some embodiments of this application, optionally, such as Figure 6 As shown, the fourth signal processing device 120 is a combiner or a power divider.

[0090] In the radio frequency front-end circuit 100 of this application embodiment, the fourth signal processing device 120 may be a combiner.

[0091] When the combiner is used as the fourth signal processing device 120, the combiner is used to combine the PRX signal of the second frequency band LB2 and the DRX signal of the first frequency band LB1 into one channel when the second antenna 112 receives the signal.

[0092] In the radio frequency front-end circuit 100 of this application embodiment, the fourth signal processing device 120 may also be a power divider.

[0093] When the power divider is used as the fourth signal processing device 120, the power divider is used to combine the PRX signal of the second frequency band LB2 and the DRX signal of the first frequency band LB1 into one channel when the second antenna 112 receives the signal.

[0094] According to the RF front-end circuit 100 of this application embodiment, the fourth signal processing device 120 is a combiner or a power divider. In this way, by adding a combiner or power divider in conjunction with a filter and a duplexer, the low-frequency band combination range of the second antenna 112 is expanded, and the number of transceiver ports used is reduced.

[0095] According to some embodiments of this application, optionally, both the first frequency band and the second frequency band are low frequency bands.

[0096] That is, the frequency range of both the first and second frequency bands is less than 1 GHz.

[0097] According to the RF front-end circuit 100 of the embodiments of this application, both the first frequency band and the second frequency band are low-frequency bands. This limits the RF front-end circuit 100 to implement CA / ENDC combinations in the low-frequency band, meeting the low-frequency band combination requirements for global network coverage.

[0098] According to some embodiments of this application, optionally, such as Figure 10 As shown, this application embodiment also provides a radio frequency (RF) circuit 200. The RF circuit 200 includes a transceiver 202 and the RF front-end circuit 100 from any of the above embodiments. The RF circuit 200 provided in this application embodiment includes the RF front-end circuit 100 from any of the above embodiments and achieves the same technical effect; therefore, to avoid repetition, it will not be described again here.

[0099] According to some embodiments of this application, optionally, such as Figure 11 As shown in the figure, this application embodiment also provides an electronic device 300. The electronic device 300 includes the radio frequency circuit 200 in the above embodiments. The electronic device 300 provided in this application embodiment includes the radio frequency circuit 200 in the above embodiments and can achieve the same technical effect; therefore, to avoid repetition, it will not be described again here.

[0100] It should be noted that the electronic device 300 in the embodiments of this application includes mobile electronic devices and non-mobile electronic devices.

[0101] In practical applications, the electronic device 300 can be a terminal or other devices besides a terminal. For example, the electronic device 300 can be a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. The embodiments of this application do not specifically limit it.

[0102] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0103] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A radio frequency front-end circuit, characterized in that, include: A first duplexer, wherein a first end of the first duplexer is connected to the transmit channel of a first frequency band, and a second end of the first duplexer is connected to the main receive channel of the first frequency band; A first signal processing device, wherein a first end of the first signal processing device is connected to a third end of the first duplexer, and a second end of the first signal processing device is connected to a diversity receiving channel of a second frequency band, and the first signal processing device is used to split the signal; The first antenna is connected to the third terminal of the first signal processing device; The second duplexer has a first end connected to the transmit channel of the second frequency band and a second end connected to the main receive channel of the second frequency band. The second signal processing device has a first end connected to the third end of the second duplexer and a second end connected to the diversity receiving channel of the first frequency band. The second signal processing device is used to split the signal. The second antenna is connected to the third terminal of the second signal processing device.

2. The radio frequency front-end circuit according to claim 1, characterized in that, Also includes: The first filter is connected to both the second terminal of the first signal processing device and the diversity reception channel of the second frequency band; The second filter is connected to both the second terminal of the second signal processing device and the diversity reception channel of the first frequency band.

3. The radio frequency front-end circuit according to claim 2, characterized in that, Also includes: A third signal processing device, wherein a first terminal of the third signal processing device is connected to both the main receiving channel of the first frequency band and the diversity receiving channel of the second frequency band, a second terminal of the third signal processing device is connected to the second terminal of the first duplexer, and a third terminal of the third signal processing device is connected to the first filter, and the third signal processing device is used to combine signals; A fourth signal processing device, wherein a first terminal of the fourth signal processing device is connected to both the main receiving channel of the second frequency band and the diversity receiving channel of the first frequency band, a second terminal of the fourth signal processing device is connected to the second terminal of the second duplexer, and a third terminal of the fourth signal processing device is connected to the second filter, and the fourth signal processing device is used to combine signals.

4. The radio frequency front-end circuit according to claim 1, characterized in that, The first signal processing device is a combiner or a power divider.

5. The radio frequency front-end circuit according to claim 1, characterized in that, The second signal processing device is a combiner or a power divider.

6. The radio frequency front-end circuit according to claim 3, characterized in that, The third signal processing device is a combiner or a power divider.

7. The radio frequency front-end circuit according to claim 3, characterized in that, The fourth signal processing device is a combiner or a power divider.

8. The radio frequency front-end circuit according to any one of claims 1 to 7, characterized in that, Both the first frequency band and the second frequency band are low frequency bands.

9. A radio frequency circuit, characterized in that, include: The radio frequency front-end circuit as described in any one of claims 1 to 8; The transceiver is connected to the radio frequency front-end circuit.

10. An electronic device, characterized in that, include: The radio frequency circuit as described in claim 9.

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