Radio frequency front-end module and electronic equipment

Abstract

The invention discloses a radio frequency front-end module and electronic equipment. The radio frequency front-end module comprises a radio frequency switch, a first duplexer, a second duplexer and a filtering unit. The radio frequency switch is provided with a first switch end, a second switch end, a third switch end and an antenna end used for being connected with an antenna. The first duplexer is provided with a first connecting end, and the first connecting end is connected to the first switch end through a first transmission link. The second duplexer is provided with a second connecting end, and the second connecting end is connected to the second switch end through a second transmission link and connected to the third switch end through a third transmission link. The filtering unit is connected to the third transmission link. According to the radio frequency front-end module provided by the invention, the radio frequency signals of three frequency bands can be transmitted and received only by arranging two duplexers, and compared with the prior art, the radio frequency front-end module can be provided with one duplexer less, so that the layout space of the radio frequency front-end module is saved, and miniaturization design is facilitated.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and more specifically, to a radio frequency front-end module and electronic equipment. Background Art

[0002] At present, RF front-end modules have been widely used in wireless communications, the Internet of Things, smart homes and other fields. They can process RF signals (for example, power amplification, filtering, etc.) to complete the tasks of receiving and transmitting RF signals.

[0003] In existing RF front-end modules, if it is necessary to receive and transmit RF signals of multiple frequency bands, a corresponding number of duplexers need to be set. For example, if the RF front-end module needs to receive and transmit frequency division duplex (FDD) RF signals of three frequency bands, three duplexers need to be set, which increases the overall volume of the RF front-end module and makes it difficult to achieve miniaturized design. Summary of the invention

[0004] The embodiments of the present application provide a radio frequency front-end module and an electronic device.

[0005] According to the first aspect of the present application, an embodiment of the present application provides a radio frequency front-end module, which is used to transmit signals in a first communication frequency band, a second communication frequency band, and a third communication frequency band, wherein the transmission frequency band in the third communication frequency band overlaps at least partially with the transmission frequency band in the second communication frequency band, and the reception frequency band in the third communication frequency band overlaps at least partially with the reception frequency band in the first communication frequency band. The radio frequency front-end module includes a radio frequency switch, a first duplexer, a second duplexer, and a filtering unit. Among them, the radio frequency switch is provided with a first switch end, a second switch end, a third switch end, and an antenna end for connecting an antenna, and the radio frequency switch is used to conduct a signal branch between at least one of the first switch end, the second switch end, and the third switch end and the antenna end. The first duplexer is provided with a first connection end, and the first connection end is connected to the first switch end through a first transmission link; the first duplexer is configured to allow signals in the first communication frequency band and signals in the reception frequency band in the third communication frequency band to pass through. The second duplexer is provided with a second connection end, the second connection end is connected to the second switch end through a second transmission link, and is connected to the third switch end through a third transmission link; the second duplexer is configured to allow signals in the second communication frequency band and signals in the transmission frequency band in the third communication frequency band to pass through. The filtering unit is connected to the third transmission link, and the filtering unit is configured to block signals in the reception frequency band in the first communication frequency band.

[0006] The embodiment of the present application provides a radio frequency front-end module, which is used to transmit signals in a first communication frequency band, signals in a second communication frequency band, and signals in a third communication frequency band. The radio frequency front-end module may include a radio frequency switch, a first duplexer, a second duplexer, and a filtering unit, wherein the first duplexer is configured to allow signals in the first communication frequency band to pass through, and the second duplexer is configured to allow signals in the second communication frequency band to pass through. In other words, the first duplexer is used to transmit and receive signals in the first communication frequency band, and the second duplexer is used to transmit and receive signals in the second communication frequency band.

[0007] In the present application, the transmission frequency band in the third communication frequency band at least partially overlaps with the transmission frequency band in the second communication frequency band, and the reception frequency band in the third communication frequency band at least partially overlaps with the reception frequency band in the first communication frequency band. Specifically, the first duplexer is also configured to allow the signal of the reception frequency band in the third communication frequency band to pass through, and the second duplexer is also configured to allow the signal of the transmission frequency band in the third communication frequency band to pass through. That is to say, the first duplexer is also used to realize the reception of the signal of the third communication frequency band, and the second duplexer is also used to realize the transmission of the signal of the third communication frequency band.

[0008] Therefore, the RF front-end module in the present application only needs to be equipped with two duplexers to transmit and receive RF signals of three frequency bands. Compared with the prior art, the RF front-end module can be equipped with one less duplexer to save the layout space of the RF front-end module, which is conducive to miniaturization design. In addition, since one less duplexer can be provided, the hardware cost of the RF front-end module can also be saved.

[0009] In addition, when the RF front-end module transmits and receives signals in the third communication frequency band, the first duplexer and the second duplexer need to simultaneously conduct the signal branches between the antenna end. At this time, the matching units in the first transmission link and the second transmission link will affect each other, so that when the RF front-end module receives the signal in the receiving frequency band in the third communication frequency band, the transmission quality of the signal will be deteriorated.

[0010] In order to solve the above problems, the present application adds a switch end (that is, the third switch end) in the RF switch, and sets a filtering unit on the third transmission link between the third switch end and the second connection end. When transmitting and receiving signals in the third communication frequency band, the RF switch can conduct the signal branch between the first switch end and the antenna end and the signal branch between the third switch end and the antenna end, and disconnect the signal branch between the second switch end and the antenna end.

[0011] Specifically, the filtering unit is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band at least partially overlaps with the receiving frequency band in the first communication frequency band, the blocking effect of the filtering unit can prevent the signal of the receiving frequency band in the third communication frequency band from leaking to the branch where the second duplexer is located. Specifically, due to the presence of the filtering unit, when receiving the signal of the third communication frequency band, the third transmission link can be regarded as an open circuit, thereby preventing the third transmission link from affecting the signal transmission of the first transmission link, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band.

[0012] To sum up, the RF front-end module in this application can save layout space and achieve miniaturized design while ensuring the transmission quality of RF signals in various communication frequency bands, so that electronic equipment equipped with the RF front-end module has higher product competitiveness.

[0013] According to the second aspect of the present application, the embodiment of the present application also provides a radio frequency front-end module, which is used to transmit signals in the first communication frequency band, the second communication frequency band, the third communication frequency band and the fourth communication frequency band, wherein the transmission frequency band in the third communication frequency band overlaps at least partially with the transmission frequency band in the second communication frequency band, and the receiving frequency band in the third communication frequency band overlaps at least partially with the receiving frequency band in the first communication frequency band; the transmission frequency band in the fourth communication frequency band overlaps at least partially with the transmission frequency band in the first communication frequency band, and the receiving frequency band in the fourth communication frequency band overlaps at least partially with the receiving frequency band in the second communication frequency band. The radio frequency front-end module includes a radio frequency switch, a first duplexer, a second duplexer, a first filtering unit and a second filtering unit. Among them, the radio frequency switch is provided with a first switch end, a second switch end, a third switch end, a fourth switch end and an antenna end for connecting an antenna, and the radio frequency switch is used to conduct a signal branch between at least one of the first switch end, the second switch end, the third switch end and the fourth switch end and the antenna end. The first duplexer is provided with a first connection end, the first connection end is connected to the first switch end through the first transmission link, and is connected to the fourth switch end through the fourth transmission link; the first duplexer is configured to allow the signal of the first communication frequency band, the signal of the receiving frequency band in the third communication frequency band, and the signal of the transmitting frequency band in the fourth communication frequency band to pass through. The second duplexer is provided with a second connection end, the second connection end is connected to the second switch end through the second transmission link, and is connected to the third switch end through the third transmission link; the second duplexer is configured to allow the signal of the second communication frequency band, the signal of the transmitting frequency band in the third communication frequency band, and the signal of the receiving frequency band in the fourth communication frequency band to pass through. The first filtering unit is connected to the third transmission link, and the first filtering unit is configured to block the signal of the receiving frequency band in the first communication frequency band. The second filtering unit is connected to the fourth transmission link, and the second filtering unit is configured to block the signal of the receiving frequency band in the second communication frequency band.

[0014] The embodiment of the present application also provides a radio frequency front-end module, which is used to transmit signals in the first communication frequency band, signals in the second communication frequency band, signals in the third communication frequency band, and signals in the fourth communication frequency band. The radio frequency front-end module may include a radio frequency switch, a first duplexer, a second duplexer, a first filtering unit, and a second filtering unit, wherein the first duplexer is configured to allow signals in the first communication frequency band to pass through, and the second duplexer is configured to allow signals in the second communication frequency band to pass through. In other words, the first duplexer is used to transmit and receive signals in the first communication frequency band, and the second duplexer is used to transmit and receive signals in the second communication frequency band.

[0015] In the present application, the transmission frequency band in the third communication frequency band at least partially overlaps with the transmission frequency band in the second communication frequency band, and the reception frequency band in the third communication frequency band at least partially overlaps with the reception frequency band in the first communication frequency band. Specifically, the first duplexer is also configured to allow the signal of the reception frequency band in the third communication frequency band to pass through, and the second duplexer is also configured to allow the signal of the transmission frequency band in the third communication frequency band to pass through. That is to say, the first duplexer is also used to realize the reception of the signal of the third communication frequency band, and the second duplexer is also used to realize the transmission of the signal of the third communication frequency band.

[0016] In the present application, the transmission frequency band in the fourth communication frequency band at least partially overlaps with the transmission frequency band in the first communication frequency band, and the reception frequency band in the fourth communication frequency band at least partially overlaps with the reception frequency band in the second communication frequency band. Specifically, the first duplexer is also configured to allow the signal of the transmission frequency band in the fourth communication frequency band to pass through, and the second duplexer is also configured to allow the signal of the reception frequency band in the fourth communication frequency band to pass through. That is to say, the first duplexer is also used to realize the transmission of the signal of the third communication frequency band, and the second duplexer is also used to realize the reception of the signal of the third communication frequency band.

[0017] Therefore, the RF front-end module in the present application only needs to be equipped with two duplexers to transmit and receive RF signals of four frequency bands. Compared with the prior art, the RF front-end module can be equipped with two fewer duplexers to save the layout space of the RF front-end module, which is conducive to miniaturization design. In addition, since two fewer duplexers can be provided, the hardware cost of the RF front-end module can also be saved.

[0018] Furthermore, the present application adds two switch ends (i.e., the third switch end and the fourth switch end) in the RF switch, and sets a first filter unit on the third transmission link between the third switch end and the second connection end, and sets a second filter unit on the fourth transmission link between the fourth switch end and the first connection end. When transmitting and receiving signals in the third communication frequency band, the RF switch can turn on the signal branch between the first switch end and the antenna end and the signal branch between the third switch end and the antenna end, and disconnect the signal branch between the second switch end and the antenna end and the signal branch between the fourth switch end and the antenna end. When transmitting and receiving signals in the fourth communication frequency band, the RF switch can turn on the signal branch between the second switch end and the antenna end and the signal branch between the fourth switch end and the antenna end, and disconnect the signal branch between the first switch end and the antenna end and the signal branch between the third switch end and the antenna end.

[0019] Specifically, the first filtering unit is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band at least partially overlaps with the receiving frequency band in the first communication frequency band, the blocking effect of the first filtering unit can prevent the signal of the receiving frequency band in the third communication frequency band from leaking to the branch where the second duplexer is located. Specifically, due to the existence of the first filtering unit, when receiving the signal of the third communication frequency band, the third transmission link can be regarded as a broken circuit, thereby avoiding the situation where the third transmission link affects the matching unit in the first transmission link, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band.

[0020] Similarly, the second filtering unit is configured to block the signal of the receiving frequency band in the second communication frequency band. When the RF front-end module receives the signal of the fourth communication frequency band, since the receiving frequency band in the fourth communication frequency band at least partially overlaps with the receiving frequency band in the second communication frequency band, the blocking effect of the second filtering unit can prevent the signal of the receiving frequency band in the fourth communication frequency band from leaking to the branch where the first duplexer is located. Specifically, due to the presence of the second filtering unit, the fourth transmission link can be regarded as an open circuit when receiving the signal of the fourth communication frequency band, thereby preventing the fourth transmission link from affecting the matching unit in the second transmission link, so as to ensure the transmission quality of the signal of the receiving frequency band in the fourth communication frequency band.

[0021] To sum up, the RF front-end module in this application can save layout space and achieve miniaturized design while ensuring the transmission quality of RF signals in various communication frequency bands, so that electronic equipment equipped with the RF front-end module has higher product competitiveness.

[0022] According to the third aspect of the present application, an embodiment of the present application further provides a radio frequency front-end module, which is used to transmit signals in a first communication frequency band, a second communication frequency band, and a third communication frequency band, wherein the transmission frequency band in the third communication frequency band at least partially overlaps with the transmission frequency band in the second communication frequency band, and the receiving frequency band in the third communication frequency band at least partially overlaps with the receiving frequency band in the first communication frequency band. The radio frequency front-end module includes a substrate and a radio frequency switch, a first duplexer, a second duplexer, and a filtering unit arranged on the substrate. Among them, the radio frequency switch is provided with a first switch end, a second switch end, a third switch end, and an antenna end for connecting an antenna, and the radio frequency switch is used to conduct a signal branch between at least one of the first switch end, the second switch end, and the third switch end and the antenna end. The first duplexer is provided with a first connection end, and the first connection end is connected to the first switch end through a first transmission link; the first duplexer is configured to allow the signal of the first communication frequency band and the signal of the receiving frequency band in the third communication frequency band to pass through; the second duplexer is provided with a second connection end, and the second connection end is connected to the second switch end through a second transmission link, and is connected to the third switch end through a third transmission link; the second duplexer is configured to allow the signal of the second communication frequency band and the signal of the transmitting frequency band in the third communication frequency band to pass through; in the substrate layout, the first duplexer and the second duplexer are arranged in sequence in the first direction, the first duplexer and the radio frequency switch are arranged at intervals in the second direction, and the first direction and the second direction intersect. The filtering unit is connected to the third transmission link, and the filtering unit is configured to block the signal of the receiving frequency band in the first communication frequency band; the filtering unit is located between the first duplexer and the radio frequency switch.

[0023] The embodiment of the present application provides a radio frequency front-end module, which only needs to set two duplexers to transmit and receive radio frequency signals in three frequency bands. Compared with the prior art, the radio frequency front-end module can be equipped with one less duplexer to save the layout space of the radio frequency front-end module, which is conducive to miniaturization design. In addition, since one less duplexer can be set, the hardware cost of the radio frequency front-end module can also be saved. Furthermore, the first duplexer and the second duplexer are respectively arranged on the substrate as two independent duplexers, which can make the layout layout of the radio frequency front-end module more flexible and reasonable.

[0024] In addition, the filtering unit is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band overlaps with the receiving frequency band in the first communication frequency band at least partially, the blocking effect of the filtering unit can prevent the signal of the receiving frequency band in the third communication frequency band from leaking to the branch where the second duplexer is located. Specifically, due to the presence of the filtering unit, the third transmission link can be regarded as a disconnection when receiving the signal of the third communication frequency band, thereby preventing the third transmission link from affecting the matching unit in the first transmission link, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band. Further, in the substrate layout, the filtering unit is located between the first duplexer and the RF switch. For example, the filtering unit can be arranged in the gap formed by the first duplexer and the RF switch, so as to make the overall layout of the RF front-end module more compact and reasonable.

[0025] To sum up, the RF front-end module in this application can save layout space and achieve miniaturized design while ensuring the transmission quality of RF signals in various communication frequency bands, so that electronic equipment equipped with the RF front-end module has higher product competitiveness.

[0026] According to a fourth aspect of the present application, an embodiment of the present application further provides an electronic device, which includes the above-mentioned radio frequency front-end module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of the RF front-end module provided in an embodiment of the present application.

[0029] Figure 2 It is a simulation diagram of the return loss provided in the implementation example of this application.

[0030] Figure 3 It is a simulation schematic diagram of the passband insertion loss provided by the implementation example of this application.

[0031] Figure 4 It is a simulation schematic diagram of the Smith chart provided in the implementation example of this application.

[0032] Figure 5 This is another structural schematic diagram of the RF front-end module provided in an embodiment of the present application.

[0033] Figure 6This is another structural diagram of the RF front-end module provided in an embodiment of the present application.

[0034] Figure 7 yes Figure 1 The schematic diagram of the layout of the RF front-end module is shown.

[0035] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0037] The embodiment of the present application provides a radio frequency front-end module 100, which is a component that integrates two or more discrete devices such as a radio frequency switch, a low noise amplifier, a filter, a duplexer, a power amplifier, etc. into an independent module, thereby improving the integration and hardware performance and miniaturizing the size.

[0038] In this embodiment, the RF front-end module 100 is used to transmit signals in a first communication frequency band, signals in a second communication frequency band, and signals in a third communication frequency band, wherein a transmitting frequency band in the third communication frequency band at least partially overlaps with a transmitting frequency band in the second communication frequency band, and a receiving frequency band in the third communication frequency band at least partially overlaps with a receiving frequency band in the first communication frequency band.

[0039] Here, "at least partially overlap" may mean that one part of the two frequency bands overlaps, and the other part does not overlap. Specifically, the ratio between the length of the overlapping frequency bands between the two frequency bands and the total length of a single frequency band therein may be greater than or equal to 80%. For example, the ratio may be 80%, 85%, 90%, 95%, 98%, etc., that is, most of the frequency bands in the two frequency bands overlap. For example, one of the frequency bands may be 1900MHz to 2000MHz, and the other frequency band may be 1920MHz to 2020MHz, and the frequency band that overlaps between the two frequency bands is 1920MHz to 2000MHz. "At least partially overlap" may also mean that one of the two frequency bands completely belongs to the interval where the other frequency band is located. For example, one of the frequency bands may be 2110MHz to 2170MHz, and the other frequency band may be 2110MHz to 2180MHz.

[0040] In some possible embodiments, any two of the transmit frequency band in the first communication frequency band, the receive frequency band in the first communication frequency band, the transmit frequency band in the second communication frequency band, and the receive frequency band in the second communication frequency band do not overlap with each other. In other words, the first communication frequency band and the second communication frequency band are two completely non-overlapping communication frequency bands to avoid signal crosstalk.

[0041] In some other possible embodiments, the transmitting frequency band in the first communication frequency band, the receiving frequency band in the first communication frequency band, the transmitting frequency band in the second communication frequency band, and the receiving frequency band in the second communication frequency band may partially overlap. Specifically, the ratio between the length of the overlapping frequency bands between the two frequency bands and the total length of a single frequency band therein may be less than or equal to 10%, for example, the ratio may be 2%, 5%, 10%, and so on. In other words, even if there are overlapping parts between the two frequency bands, the proportion of the overlapping parts is small to avoid signal crosstalk.

[0042] As an implementation mode, the first communication frequency band may be the B1 frequency band, the second communication frequency band may be the B3 frequency band, and the third communication frequency band may be the B66 frequency band. As another implementation mode, the first communication frequency band may be the B1 frequency band, the second communication frequency band may be the B3 frequency band, and the third communication frequency band may be the B4 frequency band. Specifically, the transmission frequency band of the B1 frequency band is 1920MHz to 1980MHz, and the receiving frequency band of the B1 frequency band is 2110MHz to 2170MHz. The transmission frequency band of the B3 frequency band is 1710MHz to 1785MHz, and the receiving frequency band of the B3 frequency band is 1805MHz to 1880MHz. The transmission frequency band of the B66 frequency band is 1710MHz to 1780MHz, and the receiving frequency band of the B66 frequency band is 2110MHz to 2180MHz. The transmission frequency band of the B4 frequency band is 1710MHz to 1755MHz, and the receiving frequency band of the B4 frequency band is 2110MHz to 2155MHz.

[0043] It is not difficult to understand here that the examples of the above-mentioned communication frequency bands are only illustrative. Any other three communication frequency bands can be regarded as the first communication frequency band, the second communication frequency band and the third communication frequency band in this embodiment if the above-mentioned conditions are met. This embodiment does not make any specific limitations on this.

[0044] In this embodiment, when the RF front-end module 100 transmits any one of the signals of the first communication frequency band, the signals of the second communication frequency band, and the signals of the third communication frequency band, the RF front-end module 100 is in frequency division duplexing mode (FDD). That is, when the RF front-end module 100 transmits a signal of a certain communication frequency band, it divides the communication frequency band into two non-overlapping frequency bands of uplink and downlink to achieve simultaneous two-way communication (that is, transmitting and receiving at the same time).

[0045] See also Figure 1 , the RF front-end module 100 may include an RF switch 10, a first duplexer 20, a second duplexer 30 and a filtering unit 40. The RF switch 10 is provided with a first switch terminal 102, a second switch terminal 104, a third switch terminal 106 and an antenna terminal 121 for connecting an antenna, and the RF switch 10 is used to conduct a signal branch between at least one of the first switch terminal 102, the second switch terminal 104 and the third switch terminal 106 and the antenna terminal 121. The first duplexer 20 is provided with a first connection terminal 201, and the first connection terminal 201 is connected to the first switch terminal 102 through a first transmission link 203. The first duplexer 20 is configured to allow signals in the first communication frequency band and signals in the receiving frequency band in the third communication frequency band to pass through. The second duplexer 30 is provided with a second connection end 302, the second connection end 302 is connected to the second switch end 104 through a second transmission link 304, and is connected to the third switch end 106 through a third transmission link 403. The second duplexer 30 is configured to allow signals in the second communication frequency band and signals in the transmission frequency band in the third communication frequency band to pass through. The filtering unit 40 is connected to the third transmission link 403, and the filtering unit 40 is configured to block signals in the reception frequency band in the first communication frequency band.

[0046] The embodiment of the present application provides a radio frequency front-end module 100, which may include a radio frequency switch 10, a first duplexer 20, a second duplexer 30 and a filtering unit 40, wherein the first duplexer 20 is configured to allow signals of a first communication frequency band to pass through, and the second duplexer 30 is configured to allow signals of a second communication frequency band to pass through. In other words, the first duplexer 20 is used to transmit and receive signals of the first communication frequency band, and the second duplexer 30 is used to transmit and receive signals of the second communication frequency band.

[0047] In this embodiment, the first duplexer 20 is further configured to allow signals in the receiving frequency band in the third communication frequency band to pass through, and the second duplexer 30 is further configured to allow signals in the transmitting frequency band in the third communication frequency band to pass through. In other words, the first duplexer 20 is also used to receive signals in the third communication frequency band, and the second duplexer 30 is also used to transmit signals in the third communication frequency band.

[0048] Therefore, the RF front-end module 100 in this embodiment only needs to be provided with two duplexers to transmit and receive RF signals of three frequency bands. Compared with the prior art, the RF front-end module 100 can be provided with one less duplexer to save the layout space of the RF front-end module 100, which is conducive to miniaturization design. In addition, since one less duplexer can be provided, the hardware cost of the RF front-end module 100 can also be saved.

[0049] In addition, when the RF front-end module 100 transmits and receives signals in the third communication frequency band, the first duplexer 20 and the second duplexer 30 need to simultaneously conduct the signal branches between the antenna end 121. At this time, the matching units in the first transmission link 203 and the second transmission link 304 will affect each other, so that when the RF front-end module 100 receives the signal of the receiving frequency band in the third communication frequency band, the transmission quality of the signal will be deteriorated.

[0050] In order to solve the above problems, the present application adds a switch terminal (that is, the third switch terminal 106) to the RF switch 10, and sets a filter unit 40 on the third transmission link 403 between the third switch terminal 106 and the second connection terminal 302. When transmitting and receiving signals in the third communication frequency band, the RF switch 10 can conduct the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121, and disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121.

[0051] Specifically, the filtering unit 40 is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module 100 receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band overlaps with the receiving frequency band in the first communication frequency band at least in part, the blocking effect of the filtering unit 40 can prevent the signal of the receiving frequency band in the third communication frequency band from leaking to the branch where the second duplexer 30 is located. Specifically, due to the existence of the filtering unit 40, when receiving the signal of the third communication frequency band, the third transmission link 403 can be regarded as an open circuit, thereby preventing the third transmission link 403 from affecting the matching unit in the first transmission link 203, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band.

[0052] To sum up, the RF front-end module 100 in the present application can not only save layout space and achieve miniaturized design, but also ensure the transmission quality of RF signals in various communication frequency bands, so that the electronic device equipped with the RF front-end module 100 has higher product competitiveness.

[0053] In some possible embodiments, the RF front-end module 100 may further include a first antenna matching unit 205 and a second antenna matching unit 306, wherein the first antenna matching unit 205 is connected to the first transmission link 203, and the second antenna matching unit 306 is connected to the second transmission link 304. Figure 1In the illustrated embodiment, the first antenna matching unit 205 is connected between the first connection terminal 201 and the first switch terminal 102, and the second antenna matching unit 306 is connected between the second connection terminal 302 and the second switch terminal 104, which respectively play the role of impedance matching, so that the radio frequency signal can be better transmitted and matched to the load, thereby reducing the reflection and loss of the signal. Specifically, the first antenna matching unit 205 can adopt an L-type architecture, a T-type architecture, or a Π-type architecture, and the second antenna matching unit 306 can adopt an L-type architecture, a T-type architecture, or a Π-type architecture, which is not limited in this embodiment.

[0054] It should be noted that, in order to ensure the transmission quality of the signal in the receiving frequency band in the third communication frequency band, the matching parameters of the second antenna matching unit 306 (for example, the capacitance value of the matching capacitor in the second antenna matching unit 306, the inductance value of the matching inductor, etc.) can also be optimized, which is referred to as method 1 below. In the present application, a method of adding a third switch terminal 106 to the RF switch 10 and setting a filter unit 40 is adopted, which is referred to as method 2 below. Please refer to Figures 2 to 4 , which respectively show the simulation results of the transmission quality of the signal in the second communication frequency band under the condition that the transmission quality of the signal in the third communication frequency band is ensured to be the same by the above two methods.

[0055] Figure 2 a shows the return loss simulation result corresponding to the signal in the transmission frequency band of the second communication frequency band. Figure 2 b shows the return loss simulation result corresponding to the signal of the receiving frequency band in the second communication frequency band. Among them, curves 11a and 11b correspond to the above-mentioned solution 1, and curves 12a and 12b correspond to the above-mentioned solution 2 (that is, the solution provided in this embodiment). Figure 2 It is not difficult to find that, whether in the transmitting frequency band or the receiving frequency band, the absolute value of the return loss corresponding to Scheme 2 is greater than the absolute value of the return loss corresponding to Scheme 1. Therefore, compared with Scheme 1, Scheme 2 can reduce signal loss and interference.

[0056] Figure 3 a shows the passband insertion loss simulation result corresponding to the signal in the transmission frequency band of the second communication frequency band, Figure 3 b shows the passband insertion loss simulation result corresponding to the signal of the receiving frequency band in the second communication frequency band. Among them, curves 13a and 13b correspond to the above-mentioned solution 1, and curves 14a and 14b correspond to the above-mentioned solution 2 (that is, the solution provided in this embodiment). Figure 3 It is not difficult to find that, whether in the transmitting frequency band or the receiving frequency band, the absolute value of the passband insertion loss corresponding to Scheme 2 is smaller than the absolute value of the passband insertion loss corresponding to Scheme 1. Therefore, compared with Scheme 1, Scheme 2 can improve the transmission efficiency of the signal.

[0057] Figure 4 a shows the Smith chart simulation result corresponding to the signal of the transmission frequency band in the second communication frequency band, Figure 4 b shows the Smith chart simulation result corresponding to the signal of the receiving frequency band in the second communication frequency band. Among them, curves 15a and 15b correspond to the above-mentioned solution 1, and curves 16a and 16b correspond to the above-mentioned solution 2 (that is, the solution provided in this embodiment). Figure 4 It is not difficult to find that, whether in the transmitting frequency band or the receiving frequency band, the Smith chart curve corresponding to Scheme 2 is closer to the center of the circle than the Smith chart curve corresponding to Scheme 1, indicating that the impedance of the signal in Scheme 2 (that is, the scheme provided in this embodiment) is more convergent and the signal has better transmission quality.

[0058] In summary, through Figures 2 to 4 It is not difficult to find from the simulation results that the solution provided in this embodiment can ensure the transmission quality of the signal in the third communication frequency band while ensuring the transmission quality of the signal in the second communication frequency band.

[0059] The specific implementation of the RF front-end module 100 is described below.

[0060] In this embodiment, the radio frequency switch 10 may include a first switch S1, a second switch S2, and a third switch S3, wherein the first switch S1 is connected between the first switch terminal 102 and the antenna terminal 121, and is used to control the conduction or disconnection of the signal branch between the first switch terminal 102 and the antenna terminal 121. Specifically, the first switch S1 may include a plurality of transistors (e.g., field effect transistors) connected in series to improve the withstand voltage of the first switch S1. The second switch S2 is connected between the second switch terminal 104 and the antenna terminal 121, and is used to control the conduction or disconnection of the signal branch between the second switch terminal 104 and the antenna terminal 121. Specifically, the second switch S2 may include a plurality of transistors (e.g., field effect transistors) connected in series to improve the withstand voltage of the second switch S2. The third switch S3 is connected between the third switch terminal 106 and the antenna terminal 121, and is used to control the conduction or disconnection of the signal branch between the third switch terminal 106 and the antenna terminal 121. Specifically, the third switch S3 may include a plurality of transistors (eg, field effect transistors) connected in series to improve the voltage resistance of the third switch S3. The present embodiment does not limit the specific structure of the RF switch 10.

[0061] In this embodiment, the first duplexer 20 is configured to allow signals in the first communication frequency band and signals in the receiving frequency band in the third communication frequency band to pass through. Specifically, the first duplexer 20 may include two bandpass filters, wherein the passband of one bandpass filter is the receiving frequency band in the first communication frequency band, and the passband of the other bandpass filter is the transmitting frequency band in the first communication frequency band. Specifically, the first duplexer 20 is a frequency division duplexer, which can simultaneously send and receive signals in the first communication frequency band.

[0062] In this embodiment, the first transmission link 203 is connected between the first connection terminal 201 and the first switch terminal 102 of the first duplexer 20 to realize signal transmission between the first duplexer 20 and the RF switch 10. The "first connection terminal 201" here refers to the port of the first duplexer 20 for connecting the antenna. Specifically, the first transmission link 203 may include the first antenna matching unit 205 in the above embodiment to play a role in impedance matching. Of course, the first transmission link 203 may also include other functional devices, for example, a harmonic processing circuit, which is used to filter out harmonic signals (for example, third harmonics, fourth harmonics, etc.) in the signal. This embodiment does not limit the specific implementation method of the first transmission link 203.

[0063] In some possible embodiments, see Figure 5 , the first duplexer 20 may also be provided with a first transmitting end 207 and a first receiving end 209, the first transmitting end 207 is configured to transmit a signal of a transmitting frequency band in the first communication frequency band, and the first receiving end 209 is configured to receive a signal of a receiving frequency band in the first communication frequency band and a signal of a receiving frequency band in the third communication frequency band. Specifically, the first transmitting end 207 is configured to be connected to the output end of the first power amplifier 22, and the first receiving end 209 is configured to be connected to the input end of the first low noise amplifier 24. Among them, the first power amplifier 22 may be a push-pull power amplifier, a balanced power amplifier, a Doherty power amplifier, etc., and the first low noise amplifier 24 may be a common source amplifier, a common base amplifier, etc., which is not specifically limited in this embodiment.

[0064] exist Figure 5In the illustrated embodiment, the RF front-end module 100 may further include a first transmit matching unit 26 and a first receive matching unit 28, wherein the first transmit matching unit 26 is connected between the first transmit terminal 207 and the first power amplifier 22, and the first receive matching unit 28 is connected between the first receive terminal 209 and the input terminal of the first low noise amplifier 24. The first transmit matching unit 26 and the first receive matching unit 28 respectively play the role of impedance matching to improve the transmission quality of the RF signal, specifically, the first transmit matching unit 26 may adopt an L-type architecture, a T-type architecture or a Π-type architecture, and the first receive matching unit 28 may adopt an L-type architecture, a T-type architecture or a Π-type architecture, which is not limited in this embodiment.

[0065] In this embodiment, when the RF front-end module 100 transmits and receives signals in the first communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the first switch terminal 102 and the antenna terminal 121; disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives signals in the first communication frequency band, the first switch S1 is in a closed state, and the second switch S2 and the third switch S3 are in an open state. Since the second transmission link 304 and the third transmission link 403 are both in an open circuit state, it can be ensured that the transmission performance of the signal in the first communication frequency band is not affected, so as to ensure the transmission quality of the signal.

[0066] In this embodiment, the second duplexer 30 is configured to allow the signal of the second communication frequency band and the signal of the transmission frequency band in the third communication frequency band to pass. Specifically, the second duplexer 30 may include two bandpass filters, wherein the passband of one bandpass filter is the receiving frequency band in the second communication frequency band, and the passband of the other bandpass filter is the transmission frequency band in the second communication frequency band. Specifically, the second duplexer 30 is a frequency division duplexer, which can simultaneously send and receive signals in the second communication frequency band.

[0067] In this embodiment, the second transmission link 304 is connected between the second connection terminal 302 of the second duplexer 30 and the second switch terminal 104 to realize signal transmission between the second duplexer 30 and the RF switch 10. The "second connection terminal 302" here refers to the port of the second duplexer 30 for connecting the antenna. Specifically, the second transmission link 304 may include the second antenna matching unit 306 in the above embodiment to play a role in impedance matching. Of course, the second transmission link 304 may also include other functional devices, for example, a harmonic processing circuit, which is used to filter out harmonic signals (for example, third harmonics, fourth harmonics, etc.) in the signal. This embodiment does not limit the specific implementation method of the second transmission link 304.

[0068] exist Figure 5 In the illustrated embodiment, the second duplexer 30 may also be provided with a second transmitting end 308 and a second receiving end 310, the second transmitting end 308 being configured to transmit a signal of a transmitting frequency band in the second communication frequency band and a signal of a transmitting frequency band in the third communication frequency band, and the second receiving end 310 being configured to receive a signal of a receiving frequency band in the second communication frequency band. Specifically, the second transmitting end 308 is configured to be connected to the output end of the second power amplifier 32, and the second receiving end 310 is configured to be connected to the input end of the second low noise amplifier 34. Among them, the second power amplifier 32 may be a push-pull power amplifier, a balanced power amplifier, a Doherty power amplifier, etc., and the second low noise amplifier 34 may be a common source amplifier, a common base amplifier, etc., which is not specifically limited in this embodiment.

[0069] exist Figure 5 In the illustrated embodiment, the RF front-end module 100 may further include a second transmit matching unit 36 ​​and a second receive matching unit 38, wherein the second transmit matching unit 36 ​​is connected between the second transmit terminal 308 and the second power amplifier 32, and the second receive matching unit 38 is connected between the second receive terminal 310 and the input terminal of the second low noise amplifier 34. The second transmit matching unit 36 ​​and the second receive matching unit 38 respectively play the role of impedance matching to improve the transmission quality of the RF signal. Specifically, the second transmit matching unit 36 ​​may adopt an L-type architecture, a T-type architecture or a Π-type architecture, and the second receive matching unit 38 may adopt an L-type architecture, a T-type architecture or a Π-type architecture, which is not limited in this embodiment.

[0070] In this embodiment, when the RF front-end module 100 transmits and receives signals in the second communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the second switch terminal 104 and the antenna terminal 121; disconnect the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives signals in the second communication frequency band, the second switch S2 is in a closed state, and the first switch S1 and the third switch S3 are in an open state. Since both the first transmission link 203 and the third transmission link 403 are in an open state, it can be ensured that the transmission performance of the signal in the second communication frequency band is not affected, so as to ensure the transmission quality of the signal.

[0071] In this embodiment, the third transmission link 403 is connected between the second connection end 302 of the second duplexer 30 and the third switch end 106 to realize signal transmission between the second duplexer 30 and the RF switch 10. Specifically, the third transmission link 403 may include a filtering unit 40, which is configured to block the signal of the receiving frequency band in the first communication frequency band or the receiving frequency band in the third communication frequency band, and allow the signal of the transmitting frequency band in the second communication frequency band or the transmitting frequency band in the third communication frequency band to pass.

[0072] Therefore, when transmitting signals in the third communication frequency band, the filtering unit 40 can not only isolate the signals in the receiving frequency band in the third communication frequency band, but also ensure that the signals in the transmitting frequency band in the third communication frequency band pass smoothly, and play a certain impedance matching role for the signals in the transmitting frequency band in the third communication frequency band, so as to improve the transmission quality of the signal.

[0073] In some possible embodiments, a second antenna matching unit 306 is provided on the second transmission link 304. As an implementation mode, Figure 1 As shown, one end of the filter unit 40 is connected to the common end formed by connecting the second duplexer 30 and the second antenna matching unit 306, and the other end of the filter unit 40 is connected to the third switch end 106. As another embodiment, Figure 5 As shown, one end of the filter unit 40 is connected to the common end formed by connecting the second antenna matching unit 306 and the RF switch 10, and the other end of the filter unit 40 is connected to the third switch end 106. It should be noted here that the filter unit 40 can be directly connected to the third switch end 106, and can also be indirectly connected to the third switch end 106 through other functional devices. For example, a harmonic processing circuit can also be set in the third transmission link 403, which is used to filter out harmonic signals (for example, third harmonics, fourth harmonics, etc.) in the signal. The harmonic processing circuit can be connected between the filter unit 40 and the third switch end 106.

[0074] In some possible embodiments, when the first communication frequency band is the B1 frequency band and the second communication frequency band is the B3 frequency band, the upper limit value of the transmission frequency band in the second communication frequency band is less than the lower limit value of the receiving frequency band in the first communication frequency band. Specifically, the filtering unit 40 can be a low-pass filter, and the cut-off frequency of the low-pass filter is greater than or equal to the upper limit value of the transmission frequency band in the second communication frequency band, and less than or equal to the lower limit value of the receiving frequency band in the first communication frequency band. Among them, the cut-off frequency of the low-pass filter can be understood as the resonant frequency of the capacitor and inductor in the low-pass filter. For example, when the upper limit value of the transmission frequency band in the second communication frequency band is 1785MHz and the lower limit value of the receiving frequency band in the first communication frequency band is 2110MHz, the cut-off frequency of the low-pass filter can be 1785MHz, 1850MHz, 1900MHz, 2000MHz, 2110MHz, and so on.

[0075] In some other possible embodiments, the filtering unit 40 may also be a band-stop filter, and the stop-band frequency of the band-stop filter is a receiving frequency band in the first communication frequency band.

[0076] As an implementation method, Figure 1 As shown, the filtering unit 40 may include a first capacitor C1 and a first inductor L1, the first capacitor C1 is connected between the second connection terminal 302 and the third switch terminal 106, the first inductor L1 and the first capacitor C1 are connected in parallel, and the resonant frequency of the first inductor L1 and the first capacitor C1 is the above-mentioned cut-off frequency.

[0077] It should be noted here that Figure 1 In the embodiment, one end of the first capacitor C1 is directly connected to the second connection end 302, and the other end of the first capacitor C1 is directly connected to the third switch end 106. In some other possible embodiments, one end of the first capacitor C1 may be connected to the second connection end 302 through the second antenna matching unit 306, and the other end of the first capacitor C1 is directly connected to the third switch end 106.

[0078] As another embodiment, Figure 5 As shown, the filtering unit 40 may include a second capacitor C2 and a second inductor L2, the second inductor L2 is connected between the second connection terminal 302 and the third switch terminal 106, one end of the second capacitor C2 is connected to a common terminal formed by connecting the second inductor L2 and the third switch terminal 106, the other end of the second capacitor C2 is grounded, and the resonant frequency of the second capacitor C2 and the second inductor L2 is the above-mentioned cut-off frequency.

[0079] It should be noted here that Figure 5In the embodiment, one end of the second inductor L2 is connected to the second connection terminal 302 through the second antenna matching unit 306, and the other end of the second inductor L2 is directly connected to the third switch terminal 106. In some other possible embodiments, one end of the second inductor L2 may be directly connected to the second connection terminal 302, and the other end of the second inductor L2 is directly connected to the third switch terminal 106.

[0080] Specifically, the location where the filter unit 40 is connected and the specific structure of the filter unit 40 can be flexibly adjusted according to the actual layout of the RF front-end module 100, and this embodiment does not specifically limit this.

[0081] In this embodiment, the signal of the receiving frequency band in the third communication frequency band is configured to be transmitted through the first transmission link 203, and the signal of the transmitting frequency band in the third communication frequency band is configured to be transmitted through the third transmission link 403. When the RF front-end module 100 transmits and receives the signal of the third communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121; disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives the signal of the third communication frequency band, the first switch S1 and the third switch S3 are in a closed state, and the second switch S2 is in an open state.

[0082] On the one hand, when the RF front-end module 100 receives a signal in a receiving frequency band in the third communication frequency band, since the second transmission link 304 is in an open circuit state under the action of the second switch S2, and the third transmission link 403 is also in an open circuit state under the action of the filtering unit 40, it can be avoided that the second transmission link 304 and the third transmission link 403 affect the first transmission link 203, so as to ensure the transmission quality of the signal in the receiving frequency band in the third communication frequency band. On the other hand, when the RF front-end module 100 transmits a signal in a transmitting frequency band in the third communication frequency band, since the filtering unit 40 allows the signal in the transmitting frequency band in the second communication frequency band to pass, the third transmission link 403 is in a conducting state, so that the signal in the transmitting frequency band in the third communication frequency band can be smoothly transmitted to the antenna end 121.

[0083] The embodiment of the present application provides a radio frequency front-end module 100, which may include a radio frequency switch 10, a first duplexer 20, a second duplexer 30 and a filtering unit 40, wherein the first duplexer 20 is configured to allow signals of a first communication frequency band to pass through, and the second duplexer 30 is configured to allow signals of a second communication frequency band to pass through. In other words, the first duplexer 20 is used to transmit and receive signals of the first communication frequency band, and the second duplexer 30 is used to transmit and receive signals of the second communication frequency band.

[0084] In this embodiment, the first duplexer 20 is further configured to allow signals in the receiving frequency band in the third communication frequency band to pass through, and the second duplexer 30 is further configured to allow signals in the transmitting frequency band in the third communication frequency band to pass through. In other words, the first duplexer 20 is also used to receive signals in the third communication frequency band, and the second duplexer 30 is also used to transmit signals in the third communication frequency band.

[0085] Therefore, the RF front-end module 100 in this embodiment only needs to be provided with two duplexers to transmit and receive RF signals of three frequency bands. Compared with the prior art, the RF front-end module 100 can be provided with one less duplexer to save the layout space of the RF front-end module 100, which is conducive to miniaturization design. In addition, since one less duplexer can be provided, the hardware cost of the RF front-end module 100 can also be saved.

[0086] In addition, in the embodiment of the present application, a switch terminal (that is, the third switch terminal 106) is added to the RF switch 10, and a filter unit 40 is provided on the third transmission link 403 between the third switch terminal 106 and the second connection terminal 302. When transmitting and receiving signals in the third communication frequency band, the RF switch 10 can conduct the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121, and disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121.

[0087] Specifically, the filtering unit 40 is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module 100 receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band overlaps at least partially with the receiving frequency band in the first communication frequency band, the blocking effect of the filtering unit 40 can prevent the signal of the receiving frequency band in the third communication frequency band from leaking to the branch where the second duplexer 30 is located. Specifically, due to the existence of the filtering unit 40, when receiving the signal of the third communication frequency band, the third transmission link 403 can be regarded as an open circuit, thereby preventing the third transmission link 403 from affecting the signal transmission of the first transmission link 203, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band.

[0088] To sum up, the RF front-end module 100 in the present application can not only save layout space and achieve miniaturized design, but also ensure the transmission quality of RF signals in various communication frequency bands, so that the electronic device equipped with the RF front-end module 100 has higher product competitiveness.

[0089] See also Figure 6 , Figure 6The RF front-end module 100 shown is also used to transmit signals in a fourth communication frequency band, wherein the transmission frequency band in the third communication frequency band at least partially overlaps with the transmission frequency band in the second communication frequency band, and the receiving frequency band in the third communication frequency band at least partially overlaps with the receiving frequency band in the first communication frequency band. The transmission frequency band in the fourth communication frequency band at least partially overlaps with the transmission frequency band in the first communication frequency band, and the receiving frequency band in the fourth communication frequency band at least partially overlaps with the receiving frequency band in the second communication frequency band.

[0090] In this embodiment, when the RF front-end module 100 transmits any one of the signals of the first communication frequency band, the signals of the second communication frequency band, the signals of the third communication frequency band, and the signals of the fourth communication frequency band, the RF front-end module 100 is in frequency division duplexing mode (FDD). That is, when the RF front-end module 100 transmits a signal of a certain communication frequency band, it divides the communication frequency band into two non-overlapping frequency bands of uplink and downlink to achieve simultaneous two-way communication (that is, transmitting and receiving at the same time).

[0091] In this embodiment, the RF front-end module 100 may include an RF switch 10, a first duplexer 20, a second duplexer 30, a first filtering unit 41, and a second filtering unit 50. The RF switch 10 is provided with a first switch terminal 102, a second switch terminal 104, a third switch terminal 106, a fourth switch terminal 108, and an antenna terminal 121 for connecting an antenna, and the RF switch 10 is used to conduct a signal branch between at least one of the first switch terminal 102, the second switch terminal 104, the third switch terminal 106, and the fourth switch terminal 108 and the antenna terminal 121. The first duplexer 20 is provided with a first connection terminal 201, and the first connection terminal 201 is connected to the first switch terminal 102 through a first transmission link 203, and is connected to the fourth switch terminal 108 through a fourth transmission link 504. The first duplexer 20 is configured to allow signals in the first communication frequency band, signals in the receiving frequency band in the third communication frequency band, and signals in the transmitting frequency band in the fourth communication frequency band to pass through. The second duplexer 30 is provided with a second connection end 302, the second connection end 302 is connected to the second switch end 104 through the second transmission link 304, and is connected to the third switch end 106 through the third transmission link 403. The second duplexer 30 is configured to allow the signal of the second communication frequency band, the signal of the transmission frequency band in the third communication frequency band, and the signal of the receiving frequency band in the fourth communication frequency band to pass. The first filtering unit 41 is connected to the third transmission link 403, and the first filtering unit 41 is configured to block the signal of the receiving frequency band in the first communication frequency band. The second filtering unit 50 is connected to the fourth transmission link 504, and the second filtering unit 50 is configured to block the signal of the receiving frequency band in the second communication frequency band.

[0092] The embodiment of the present application provides a radio frequency front-end module 100, which may include a radio frequency switch 10, a first duplexer 20, a second duplexer 30, a first filtering unit 41 and a second filtering unit 50, wherein the first duplexer 20 is configured to allow signals of a first communication frequency band to pass through, and the second duplexer 30 is configured to allow signals of a second communication frequency band to pass through. In other words, the first duplexer 20 is used to transmit and receive signals of the first communication frequency band, and the second duplexer 30 is used to transmit and receive signals of the second communication frequency band.

[0093] In this embodiment, the transmission frequency band in the third communication frequency band at least partially overlaps with the transmission frequency band in the second communication frequency band, and the reception frequency band in the third communication frequency band at least partially overlaps with the reception frequency band in the first communication frequency band. Specifically, the first duplexer 10 is also configured to allow the signal of the reception frequency band in the third communication frequency band to pass through, and the second duplexer 20 is also configured to allow the signal of the transmission frequency band in the third communication frequency band to pass through. That is to say, the first duplexer 10 is also used to realize the reception of the signal of the third communication frequency band, and the second duplexer 20 is also used to realize the transmission of the signal of the third communication frequency band.

[0094] In the present application, the transmission frequency band in the fourth communication frequency band at least partially overlaps with the transmission frequency band in the first communication frequency band, and the reception frequency band in the fourth communication frequency band at least partially overlaps with the reception frequency band in the second communication frequency band. Specifically, the first duplexer 10 is also configured to allow the signal of the transmission frequency band in the fourth communication frequency band to pass through, and the second duplexer 20 is also configured to allow the signal of the reception frequency band in the fourth communication frequency band to pass through. That is to say, the first duplexer 10 is also used to realize the transmission of the signal of the third communication frequency band, and the second duplexer 20 is also used to realize the reception of the signal of the third communication frequency band.

[0095] Therefore, the RF front-end module 100 in the embodiment of the present application only needs to be provided with two duplexers to transmit and receive RF signals of four frequency bands. Compared with the prior art, the RF front-end module 100 can be provided with two fewer duplexers to save the layout space of the RF front-end module 100, which is conducive to miniaturization design. In addition, since two fewer duplexers can be provided, the hardware cost of the RF front-end module 100 can also be saved.

[0096] Furthermore, the present application adds two switch terminals (i.e., the third switch terminal 106 and the fourth switch terminal 108) to the RF switch 10, and sets a first filter unit 41 on the third transmission link 403 between the third switch terminal 106 and the second connection terminal 302, and sets a second filter unit 50 on the fourth transmission link 504 between the fourth switch terminal 108 and the first connection terminal 201. When transmitting and receiving signals in the third communication frequency band, the RF switch 10 can conduct the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121, and disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121 and the signal branch between the fourth switch terminal 108 and the antenna terminal 121. When transmitting and receiving signals in the fourth communication frequency band, the RF switch can turn on the signal branch between the second switch terminal 104 and the antenna terminal 121 and the signal branch between the fourth switch terminal 108 and the antenna terminal 121, and disconnect the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121.

[0097] Specifically, the first filtering unit 41 is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module 100 receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band overlaps at least partially with the receiving frequency band in the first communication frequency band, the signal of the receiving frequency band in the third communication frequency band can be prevented from leaking to the branch where the second duplexer 30 is located under the blocking effect of the first filtering unit 41. Specifically, due to the existence of the first filtering unit 41, the third transmission link 403 can be regarded as an open circuit, thereby preventing the third transmission link 403 from affecting the signal transmission of the first transmission link 203, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band.

[0098] Similarly, the second filtering unit 50 is configured to block the signal of the receiving frequency band in the second communication frequency band. When the RF front-end module receives the signal of the fourth communication frequency band, since the receiving frequency band in the fourth communication frequency band overlaps at least partially with the receiving frequency band in the second communication frequency band, the blocking effect of the second filtering unit 50 can prevent the signal of the receiving frequency band in the fourth communication frequency band from leaking to the branch where the first duplexer 20 is located. Specifically, due to the existence of the second filtering unit 50, the fourth transmission link 504 can be regarded as an open circuit, thereby preventing the fourth transmission link 504 from affecting the signal transmission of the second transmission link 304, so as to ensure the transmission quality of the signal of the receiving frequency band in the fourth communication frequency band.

[0099] To sum up, the RF front-end module 100 in the present application can not only save layout space and achieve miniaturized design, but also ensure the transmission quality of RF signals in various communication frequency bands, so that the electronic device equipped with the RF front-end module 100 has higher product competitiveness.

[0100] The specific implementation of the RF front-end module 100 is described below.

[0101] In this embodiment, the RF switch 10 may include a fourth switch S4, which is connected between the fourth switch terminal 108 and the antenna terminal 121, and is used to control the conduction or disconnection of the signal branch between the fourth switch terminal 108 and the antenna terminal 121. Specifically, the fourth switch S4 may include a plurality of transistors (e.g., field effect transistors) connected in series to improve the voltage withstand capability of the fourth switch S4.

[0102] Specifically, the relevant descriptions of the RF switch 10, the first duplexer 20, the second duplexer 30, the first transmission link 203, and the second transmission link 304 can refer to the relevant descriptions in the above embodiments. It should be noted here that, in the absence of a conflict, the relevant features of the RF switch 10, the first duplexer 20, the second duplexer 30, the first transmission link 203, and the second transmission link 304 in the above embodiments can be combined with this embodiment, and in order to save space, they will not be repeated here one by one.

[0103] Specifically, for the relevant introduction of the first filtering unit 41, reference can be made to the relevant description of the filtering unit 40 in the above embodiment. It should be noted here that, in the absence of conflict, the relevant features of the filtering unit 40 in the above embodiment can be combined with the first filtering unit 41 in this embodiment, and in order to save space, they will not be described one by one here.

[0104] In this embodiment, the second filtering unit 50 is configured to block signals in the receiving frequency band in the second communication frequency band, and allow signals in the transmitting frequency band in the first communication frequency band to pass through.

[0105] In some possible embodiments, a first antenna matching unit 205 is provided on the first transmission link 203. As an implementation mode, Figure 6 As shown, one end of the second filter unit 50 is connected to the common end formed by connecting the first duplexer 20 and the first antenna matching unit 205, and the other end of the second filter unit 50 is connected to the fourth switch end 108. As another embodiment, one end of the second filter unit 50 is connected to the common end formed by connecting the first antenna matching unit 205 and the RF switch 10, and the other end of the second filter unit 50 is connected to the fourth switch end 108.

[0106] For the specific implementation of the second filtering unit 50, reference may be made to the relevant description of the filtering unit 40 in the above embodiment. It should be noted here that, in the absence of conflict, the relevant features of the filtering unit 40 in the above embodiment can be combined with the second filtering unit 50 in this embodiment, and in order to save space, they will not be described one by one here.

[0107] The working process of the RF front-end module 100 is described below.

[0108] When the RF front-end module 100 transmits and receives signals in the first communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the first switch terminal 102 and the antenna terminal 121; disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121, the signal branch between the third switch terminal 106 and the antenna terminal 121, and the signal branch between the fourth switch terminal 108 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives signals in the first communication frequency band, the first switch S1 is in a closed state, and the second switch S2, the third switch S3, and the fourth switch S4 are in an open state. Since the second transmission link 304, the third transmission link 403, and the fourth transmission link 504 are all in an open circuit state, it can be ensured that the transmission performance of the signal in the first communication frequency band is not affected, so as to ensure the transmission quality of the signal.

[0109] When the RF front-end module 100 transmits and receives signals in the second communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the second switch terminal 104 and the antenna terminal 121; disconnect the signal branch between the first switch terminal 102 and the antenna terminal 121, the signal branch between the third switch terminal 106 and the antenna terminal 121, and the signal branch between the fourth switch terminal 108 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives signals in the second communication frequency band, the second switch S2 is in a closed state, and the first switch S1, the third switch S3, and the fourth switch S4 are in an open state. Since the first transmission link 203, the third transmission link 403, and the fourth transmission link 504 are all in an open circuit state, it can be ensured that the transmission performance of the signal in the second communication frequency band is not affected, so as to ensure the transmission quality of the signal.

[0110] When the RF front-end module 100 transmits and receives signals in the third communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121; and disconnect the signal branch between the second switch terminal 104 and the antenna terminal 121 and the signal branch between the fourth switch terminal 108 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives signals in the third communication frequency band, the first switch S1 and the third switch S3 are in a closed state, and the second switch S2 and the fourth switch S4 are in an open state.

[0111] On the one hand, when the RF front-end module 100 receives a signal in a receiving frequency band in the third communication frequency band, since the second transmission link 304 and the fourth transmission link 504 are in an open circuit state under the action of the second switch S2 and the fourth switch S4, respectively, and the third transmission link 403 is also in an open circuit state under the action of the first filtering unit 41, it can be avoided that the second transmission link 304, the third transmission link 403 and the fourth transmission link 504 affect the first transmission link 203, so as to ensure the transmission quality of the signal in the receiving frequency band in the third communication frequency band. On the other hand, when the RF front-end module 100 transmits a signal in a transmitting frequency band in the third communication frequency band, since the first filtering unit 41 allows the signal in the transmitting frequency band in the second communication frequency band to pass, so that the third transmission link 403 is in a conducting state, the signal in the transmitting frequency band in the third communication frequency band can be smoothly transmitted to the antenna end 121.

[0112] In this embodiment, the signal of the receiving frequency band in the fourth communication frequency band is configured to be transmitted through the second transmission link 304, and the signal of the transmitting frequency band in the fourth communication frequency band is configured to be transmitted through the fourth transmission link 504. When the RF front-end module 100 transmits and receives the signal of the fourth communication frequency band, the RF switch 10 is configured to: conduct the signal branch between the second switch terminal 104 and the antenna terminal 121 and the signal branch between the fourth switch terminal 108 and the antenna terminal 121; disconnect the signal branch between the first switch terminal 102 and the antenna terminal 121 and the signal branch between the third switch terminal 106 and the antenna terminal 121. Specifically, when the RF front-end module 100 transmits and receives the signal of the fourth communication frequency band, the second switch S2 and the fourth switch S4 are in a closed state, and the first switch S1 and the third switch S3 are in an open state.

[0113] On the one hand, when the RF front-end module 100 receives a signal in a receiving frequency band in the fourth communication frequency band, since the first transmission link 203 and the third transmission link 304 are in an open circuit state under the action of the first switch S1 and the third switch S3 respectively, and the fourth transmission link 504 is also in an open circuit state under the action of the second filtering unit 50, it can be avoided that the first transmission link 203, the third transmission link 403 and the fourth transmission link 504 affect the second transmission link 304, so as to ensure the transmission quality of the signal in the receiving frequency band in the fourth communication frequency band. On the other hand, when the RF front-end module 100 transmits a signal in a transmitting frequency band in the fourth communication frequency band, since the second filtering unit 50 allows the signal in the transmitting frequency band in the first communication frequency band to pass, so that the fourth transmission link 504 is in a conducting state, the signal in the transmitting frequency band in the fourth communication frequency band can be smoothly transmitted to the antenna end 121.

[0114] It should be noted that the RF front-end module 100 in this embodiment may also include other duplexers to implement the transmission and reception of signals in other communication frequency bands. In theory, when the number of duplexers is N, the RF front-end module 100 can transmit and receive N signals. 2 The transmission and reception of signals in different communication frequency bands can save the layout space of the RF front-end module and reduce the hardware cost of the RF front-end module.

[0115] See also Figure 7 , Figure 7 for Figure 1 The schematic diagram of the layout of the RF front-end module 100 is shown. The RF front-end module 100 may include a substrate 60 and an RF switch 10, a first duplexer 20, a second duplexer 30 and a filter unit 40 arranged on the substrate 60. The RF switch 10 is provided with a first switch terminal 102, a second switch terminal 104, a third switch terminal 106 and an antenna terminal 121 for connecting an antenna. The RF switch 10 is used to conduct a signal branch between at least one of the first switch terminal 102, the second switch terminal 104 and the third switch terminal 106 and the antenna terminal 121. The first duplexer 20 is provided with a first connection terminal 201, and the first connection terminal 201 is connected to the first switch terminal 102 through a first transmission link 203; the first duplexer 20 is configured to allow signals in the first communication frequency band and signals in the receiving frequency band in the third communication frequency band to pass through. The second duplexer 30 is provided with a second connection end 302, which is connected to the second switch end 104 through a second transmission link 304, and is connected to the third switch end 106 through a third transmission link 403; the second duplexer 30 is configured to allow signals in the second communication frequency band and signals in the transmission frequency band in the third communication frequency band to pass through.

[0116] In the layout of the substrate 60, the first duplexer 20 and the second duplexer 30 are sequentially arranged in the first direction X, the first duplexer 20 and the RF switch 10 are arranged at intervals in the second direction Y, and the first direction X and the second direction Y intersect. In some possible embodiments, the first direction X and the second direction Y are perpendicular to each other, for example, the first direction X may be the length direction of the substrate 60, and the second direction Y may be the width direction of the substrate 60. The filter unit 40 is connected to the third transmission link 403, and the filter unit 40 is configured to block the signal of the receiving frequency band in the first communication frequency band, and the filter unit 40 is located between the first duplexer 20 and the RF switch 10.

[0117] The embodiment of the present application provides a radio frequency front-end module 100, which only needs to be provided with two duplexers to transmit and receive radio frequency signals of three frequency bands. Compared with the prior art, the radio frequency front-end module 100 can be provided with one less duplexer to save the layout space of the radio frequency front-end module 100, which is conducive to miniaturization design. In addition, since one less duplexer can be provided, the hardware cost of the radio frequency front-end module 100 can also be saved. Furthermore, the first duplexer 20 and the second duplexer 30 are respectively provided on the substrate 60 as two independent duplexers, which can make the layout and wiring layout of the radio frequency front-end module 100 more flexible and reasonable.

[0118] In addition, the filter unit 40 is configured to block the signal of the receiving frequency band in the first communication frequency band. When the RF front-end module 100 receives the signal of the third communication frequency band, since the receiving frequency band in the third communication frequency band overlaps with the receiving frequency band in the first communication frequency band at least in part, the signal of the receiving frequency band in the third communication frequency band can be prevented from leaking to the branch where the second duplexer 30 is located under the blocking effect of the filter unit 40. Specifically, due to the presence of the filter unit 40, when receiving the signal of the third communication frequency band, the third transmission link 403 can be regarded as a circuit breaker, thereby preventing the third transmission link 403 from affecting the signal transmission of the first transmission link 203, so as to ensure the transmission quality of the signal of the receiving frequency band in the third communication frequency band. Further, in the layout of the substrate 60, the filter unit 40 is located between the first duplexer 20 and the RF switch 10. For example, the filter unit 40 can be arranged in the gap formed by the first duplexer 20 and the RF switch 10, so as to make the overall layout of the RF front-end module 100 more compact and reasonable.

[0119] To sum up, the RF front-end module 100 in the present application can not only save layout space and achieve miniaturized design, but also ensure the transmission quality of RF signals in various communication frequency bands, so that the electronic device equipped with the RF front-end module 100 has higher product competitiveness.

[0120] In this embodiment, the substrate 60 is roughly rectangular, and is used to fix and support the components (e.g., the RF switch 10, the first duplexer 20, the second duplexer 30, and the filter unit 40) in the RF front-end module 100. Specifically, the substrate 60 may be a copper-clad laminate, and a circuit may be printed on the surface of the substrate 60 by performing hole processing, chemical copper plating, electroplating, etching, and other processing on the copper-clad laminate.

[0121] Specifically, the RF switch 10 can be integrated in a switch chip, and the switch chip can be fixed on the substrate 60 by a bonding process or a flip-chip process. The first duplexer 20 and the second duplexer 30 can be integrated in two duplexer chips respectively, so that the first duplexer 20 and the second duplexer 30 can be respectively arranged on the substrate 60 as independent devices, so that the layout of the layout of the RF front-end module 100 is more flexible and reasonable. The inductor and capacitor in the filter unit 40 can be mounted on the substrate 60 in the form of surface mounted devices (Surface Mounted Devices, SMD). Of course, the inductor in the filter unit 40 can also be wound on the substrate 60 in the form of metal wiring, which is not specifically limited in this embodiment.

[0122] For the relevant introduction of the RF switch 10, the first duplexer 20, the second duplexer 30, and the filter unit 40, reference can be made to the relevant description in the above embodiment. It should be noted here that, in the case of no conflict, the relevant features of the RF switch 10, the first duplexer 20, the second duplexer 30, and the filter unit 40 in the above embodiment can be combined with this embodiment, and in order to save space, they will not be described one by one here.

[0123] In some possible embodiments, the first duplexer 20 may further be provided with a first transmitting end 207 and a first receiving end 209, and the first transmitting end 207 and the first receiving end 209 are respectively located on opposite sides of the first duplexer 20. The first transmitting end 207 is configured to transmit a signal of a transmitting frequency band in the first communication frequency band, and the first receiving end 209 is configured to receive a signal of a receiving frequency band in the first communication frequency band and a signal of a receiving frequency band in the third communication frequency band.

[0124] The RF front-end module 100 may also include a first transmit matching unit 26 and a first receive matching unit 28 arranged on the substrate 60, the first transmit matching unit 26 is connected to the first transmit end 207, the first receive matching unit 28 is connected to the first receive end 209, and the first transmit matching unit 26 and the first receive matching unit 28 are respectively located on opposite sides of the first duplexer 20 to improve the signal isolation between the signal in the receiving frequency band and the signal in the transmitting frequency band when the first duplexer 20 simultaneously receives and transmits the signal in the first communication frequency band, so as to avoid signal crosstalk.

[0125] Specifically, the inductor and capacitor in the first transmit matching unit 26 and the first receive matching unit 28 can be mounted on the substrate 60 in the form of SMD devices. Of course, the inductor can also be wound on the substrate 60 in the form of metal traces. This embodiment does not limit the specific implementation method of the first transmit matching unit 26 and the first receive matching unit 28.

[0126] In some possible embodiments, the second duplexer 30 may also be provided with a second transmitting end 308 and a second receiving end 310, and the second transmitting end 308 and the second receiving end 310 are respectively located on opposite sides of the second duplexer 30. The second transmitting end 308 is configured to transmit a signal of a transmitting frequency band in the second communication frequency band and a signal of a transmitting frequency band in the third communication frequency band, and the second receiving end 310 is configured to receive a signal of a receiving frequency band in the second communication frequency band.

[0127] The RF front-end module 100 may also include a second transmit matching unit 36 ​​and a second receive matching unit 38 arranged on the substrate 60, the second transmit matching unit 36 ​​is connected to the second transmit end 308, the second receive matching unit 38 is connected to the second receive end 310, and the second transmit matching unit 36 ​​and the second receive matching unit 38 are respectively located on opposite sides of the second duplexer 30 to improve the signal isolation between the signal of the receiving frequency band and the signal of the transmitting frequency band when the second duplexer 30 simultaneously receives and transmits the signal of the second communication frequency band, so as to avoid signal crosstalk.

[0128] Specifically, the inductor and capacitor in the second transmit matching unit 36 ​​and the second receive matching unit 38 can be mounted on the substrate 60 in the form of SMD devices. Of course, the inductor can also be wound on the substrate 60 in the form of metal wiring. This embodiment does not limit the specific implementation method of the second transmit matching unit 36 ​​and the second receive matching unit 38.

[0129] exist Figure 7 In the illustrated embodiment, the first transmission matching unit 26, the second transmission matching unit 36 ​​and the second duplexer 30 are sequentially arranged in the second direction Y, and the first transmission matching unit 26 and the second transmission matching unit 36 ​​are located on the side of the second duplexer 30 close to the RF switch 10, so as to make the overall layout of the RF front-end module 100 more compact. Specifically, the first transmitting end 207 and the second transmitting end 308 are both arranged on the side of the corresponding duplexer close to the RF switch 10, so as to shorten the length of the signal path between the first transmission matching unit 26 and the first transmitting end 207 and the length of the signal path between the second transmission matching unit 36 ​​and the second transmitting end 308, so as to reduce the loss of signal transmission.

[0130] Of course, in some other possible embodiments, the first transmission matching unit 26 and the second transmission matching unit 36 ​​may also be arranged in sequence in the first direction X, wherein the first transmission matching unit 26 is arranged adjacent to the first duplexer 20, and the second transmission matching unit 36 ​​is arranged adjacent to the second duplexer 30, which can shorten the length of the signal path between the transmission matching unit and the corresponding duplexer to reduce the loss of signal transmission. Specifically, the R&D personnel may also flexibly adjust the specific setting positions of the first transmission matching unit 26 and the second transmission matching unit 36 ​​according to the actual layout of the RF front-end module 100, which is not limited in this embodiment.

[0131] exist Figure 7 In the illustrated embodiment, the first receiving matching unit 28 and the second receiving matching unit 38 are sequentially arranged in the first direction X, and the first receiving matching unit 28 and the second receiving matching unit 38 are located on the side of the second duplexer 30 away from the RF switch 10, so as to make the overall layout of the RF front-end module 100 more compact. Specifically, the first receiving end 209 and the second receiving end 310 are both arranged on the side of the corresponding duplexer away from the RF switch 10, so as to shorten the length of the signal path between the first receiving matching unit 28 and the first receiving end 209 and the length of the signal path between the second receiving matching unit 38 and the second receiving end 310, so as to reduce the loss of signal transmission. In addition, the R&D personnel can also flexibly adjust the specific setting positions of the first receiving matching unit 28 and the second receiving matching unit 38 according to the actual layout of the RF front-end module 100, and this embodiment does not limit this.

[0132] See also Figure 8 This embodiment also provides an electronic device 500, which may be a 4G or 5G communication device such as a smart phone, a tablet computer, or a smart watch. Specifically, the electronic device 500 may include the RF front-end module 100 in the above embodiment to receive and send RF signals.

[0133] In addition, with the development of 5G technology, the requirements for the performance of RF front-end modules are getting higher and higher. The technical solution of this application can be applied to 5G RF front-end modules to improve the communication performance of 5G communication equipment.

[0134] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0135] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0136] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0138] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A radio frequency front-end module, characterized in that: Used to transmit a signal of a first communication frequency band, a signal of a second communication frequency band, and a signal of a third communication frequency band, wherein a transmitting frequency band in the third communication frequency band at least partially overlaps with a transmitting frequency band in the second communication frequency band, and a receiving frequency band in the third communication frequency band at least partially overlaps with a receiving frequency band in the first communication frequency band; the RF front-end module comprises: A radio frequency switch, comprising a first switch end, a second switch end, a third switch end and an antenna end for connecting an antenna, wherein the radio frequency switch is used to conduct a signal branch between at least one of the first switch end, the second switch end and the third switch end and the antenna end; A first duplexer is provided with a first connection end, wherein the first connection end is connected to the first switch end through a first transmission link; the first duplexer is configured to allow signals in the first communication frequency band and signals in a receiving frequency band in the third communication frequency band to pass through; a second duplexer having a second connection end, the second connection end being connected to the second switch end through a second transmission link, and being connected to the third switch end through a third transmission link; the second duplexer being configured to allow signals of the second communication frequency band and signals of a transmission frequency band in the third communication frequency band to pass through; and A filtering unit is connected to the third transmission link, and the filtering unit is configured to block signals of a receiving frequency band in the first communication frequency band.

2. The RF front-end module according to claim 1, characterized in that: When the RF front-end module transmits any one of the signal of the first communication frequency band, the signal of the second communication frequency band, and the signal of the third communication frequency band, the RF front-end module is in frequency division duplex mode.

3. The RF front-end module according to claim 1, characterized in that: The signal of the receiving frequency band in the third communication frequency band is configured to be transmitted through the first transmission link, and the signal of the transmitting frequency band in the third communication frequency band is configured to be transmitted through the third transmission link.

4. The RF front-end module according to claim 1, characterized in that: Any two of the transmitting frequency band in the first communication frequency band, the receiving frequency band in the first communication frequency band, the transmitting frequency band in the second communication frequency band, and the receiving frequency band in the second communication frequency band do not overlap with each other.

5. The RF front-end module according to claim 1, characterized in that: In the case where the RF front-end module transmits and receives signals in the third communication frequency band, the RF switch is configured to: conduct a signal branch between the first switch end and the antenna end and a signal branch between the third switch end and the antenna end; Disconnect the signal branch between the second switch terminal and the antenna terminal.

6. The RF front-end module according to claim 1, characterized in that: When the RF front-end module transmits and receives signals in the first communication frequency band, the RF switch is configured to: turn on the signal branch between the first switch end and the antenna end; and disconnect the signal branch between the second switch end and the antenna end and the signal branch between the third switch end and the antenna end.

7. The RF front-end module according to claim 6, characterized in that: The first duplexer is also provided with a first transmitting end and a first receiving end, the first transmitting end is configured to transmit a signal of a transmitting frequency band in the first communication frequency band, and the first receiving end is configured to receive a signal of a receiving frequency band in the first communication frequency band and a signal of a receiving frequency band in the third communication frequency band.

8. The RF front-end module according to claim 7, characterized in that: The first transmitting end is configured to be connected to an output end of a first power amplifier, and the first receiving end is configured to be connected to an input end of a first low noise amplifier.

9. The RF front-end module according to claim 8, characterized in that: The RF front-end module further includes a first transmit matching unit and a first receive matching unit, wherein the first transmit matching unit is connected between the first transmit end and the first power amplifier, and the first receive matching unit is connected between the first receive end and the input end of a first low noise amplifier; or / and The RF front-end module also includes a first antenna matching unit, which is connected to the first transmission link.

10. The RF front-end module according to claim 1, characterized in that: When the RF front-end module transmits and receives signals in the second communication frequency band, the RF switch is configured to: turn on the signal branch between the second switch end and the antenna end; and disconnect the signal branch between the first switch end and the antenna end and the signal branch between the third switch end and the antenna end.

11. The RF front-end module according to claim 10, characterized in that: The second duplexer is also provided with a second transmitting end and a second receiving end, the second transmitting end is configured to transmit signals in a transmitting frequency band in the second communication frequency band and signals in a transmitting frequency band in the third communication frequency band, and the second receiving end is configured to receive signals in a receiving frequency band in the second communication frequency band.

12. The RF front-end module according to claim 11, characterized in that: The second transmitting end is configured to be connected to an output end of a second power amplifier, and the second receiving end is configured to be connected to an input end of a second low noise amplifier.

13. The RF front-end module according to claim 12, characterized in that: The RF front-end module also includes a second transmit matching unit and a second receive matching unit, the second transmit matching unit is connected between the second transmit end and the second power amplifier, and the second receive matching unit is connected between the second receive end and the input end of the second low noise amplifier.

14. The RF front-end module according to claim 1, characterized in that: The RF front-end module also includes a second antenna matching unit, and the second antenna matching unit is connected to the second transmission link.

15. The RF front-end module according to claim 14, characterized in that: One end of the filter unit is connected to a common end formed by connecting the second duplexer and the second antenna matching unit, and the other end of the filter unit is connected to the third switch end; or, one end of the filter unit is connected to a common end formed by connecting the second antenna matching unit and the RF switch, and the other end of the filter unit is connected to the third switch end.

16. The RF front-end module according to any one of claims 1 to 15, characterized in that: The filtering unit is further configured to allow signals in the transmission frequency band in the second communication frequency band to pass through.

17. The RF front-end module according to any one of claims 1 to 15, characterized in that: The filtering unit includes a first capacitor and a first inductor, the first capacitor is connected between the second connection terminal and the third switch terminal, and the first inductor and the first capacitor are connected in parallel; or, The filtering unit includes a second capacitor and a second inductor, the second inductor is connected between the second connection end and the third switch end, one end of the second capacitor is connected to a common end formed by connecting the second inductor and the third switch end, and the other end of the second capacitor is grounded.

18. The RF front-end module according to any one of claims 1 to 15, characterized in that: The upper limit value of the transmission frequency band in the second communication frequency band is less than the lower limit value of the reception frequency band in the first communication frequency band; The filtering unit is a low-pass filter, the cut-off frequency of the low-pass filter is greater than or equal to the upper limit of the transmission frequency band in the second communication frequency band, and is less than or equal to the lower limit of the reception frequency band in the first communication frequency band; or, The filtering unit is a band-stop filter, and the stop-band frequency of the band-stop filter is a receiving frequency band in the first communication frequency band.

19. The RF front-end module according to any one of claims 1 to 15, characterized in that: The first communication frequency band is a B1 frequency band, a transmitting frequency band of the B1 frequency band is 1920 MHz to 1980 MHz, and a receiving frequency band of the B1 frequency band is 2110 MHz to 2170 MHz; The second communication frequency band is a B3 frequency band, a transmitting frequency band of the B3 frequency band is 1710 MHz to 1785 MHz, and a receiving frequency band of the B3 frequency band is 1805 MHz to 1880 MHz; The third communication frequency band is the B66 frequency band, the transmitting frequency band of the B66 frequency band is 1710MHz to 1780MHz, and the receiving frequency band of the B66 frequency band is 2110MHz to 2180MHz; or, the third communication frequency band is the B4 frequency band, the transmitting frequency band of the B4 frequency band is 1710MHz to 1755MHz, and the receiving frequency band of the B4 frequency band is 2110MHz to 2155MHz.

20. A radio frequency front-end module, characterized in that: Used to transmit signals in a first communication frequency band, signals in a second communication frequency band, signals in a third communication frequency band, and signals in a fourth communication frequency band, wherein a transmission frequency band in the third communication frequency band at least partially overlaps with a transmission frequency band in the second communication frequency band, and a receiving frequency band in the third communication frequency band at least partially overlaps with a receiving frequency band in the first communication frequency band; a transmission frequency band in the fourth communication frequency band at least partially overlaps with a transmission frequency band in the first communication frequency band, and a receiving frequency band in the fourth communication frequency band at least partially overlaps with a receiving frequency band in the second communication frequency band; the RF front-end module includes: A radio frequency switch, comprising a first switch end, a second switch end, a third switch end, a fourth switch end and an antenna end for connecting an antenna, wherein the radio frequency switch is used to conduct a signal branch between at least one of the first switch end, the second switch end, the third switch end and the fourth switch end and the antenna end; A first duplexer is provided with a first connection end, the first connection end is connected to the first switch end through a first transmission link, and is connected to the fourth switch end through a fourth transmission link; the first duplexer is configured to allow signals of the first communication frequency band, signals of a receiving frequency band in the third communication frequency band, and signals of a transmitting frequency band in the fourth communication frequency band to pass through; A second duplexer is provided with a second connection end, the second connection end is connected to the second switch end through a second transmission link, and is connected to the third switch end through a third transmission link; the second duplexer is configured to allow signals of the second communication frequency band, signals of the transmission frequency band in the third communication frequency band, and signals of the reception frequency band in the fourth communication frequency band to pass through; a first filtering unit, connected to the third transmission link, the first filtering unit being configured to block signals of a receiving frequency band in the first communication frequency band; and A second filtering unit is connected to the fourth transmission link, and the second filtering unit is configured to block signals in a receiving frequency band in the second communication frequency band.

21. The radio frequency front-end module according to claim 20, characterized in that: In the case where the RF front-end module transmits and receives signals in the third communication frequency band, the RF switch is configured to: conduct a signal branch between the first switch end and the antenna end and a signal branch between the third switch end and the antenna end; The signal branch between the second switch terminal and the antenna terminal and the signal branch between the fourth switch terminal and the antenna terminal are disconnected.

22. The radio frequency front-end module according to claim 20, characterized in that: When the RF front-end module transmits and receives signals in the fourth communication frequency band, the RF switch is configured to: turn on the signal branch between the second switch end and the antenna end and the signal branch between the fourth switch end and the antenna end; and turn off the signal branch between the first switch end and the antenna end and the signal branch between the third switch end and the antenna end.

23. The RF front-end module according to claim 20, characterized in that: In the case where the RF front-end module transmits and receives signals in the first communication frequency band, the RF switch is configured to: turn on the signal branch between the first switch end and the antenna end; and turn off the signal branch between the second switch end and the antenna end, the signal branch between the third switch end and the antenna end, and the signal branch between the fourth switch end and the antenna end; When the RF front-end module transmits and receives the second RF signal, the RF switch is configured to: turn on the signal branch between the second switch end and the antenna end; and disconnect the signal branch between the first switch end and the antenna end, the signal branch between the third switch end and the antenna end, and the signal branch between the fourth switch end and the antenna end.

24. A radio frequency front-end module, characterized in that: Used to transmit signals in a first communication frequency band, signals in a second communication frequency band, and signals in a third communication frequency band, wherein a transmission frequency band in the third communication frequency band at least partially overlaps with a transmission frequency band in the second communication frequency band, and a reception frequency band in the third communication frequency band at least partially overlaps with a reception frequency band in the first communication frequency band; the RF front-end module includes a substrate and a RF switch, a first duplexer, a second duplexer, and a filtering unit arranged on the substrate; The RF switch is provided with a first switch end, a second switch end, a third switch end and an antenna end for connecting an antenna, and the RF switch is used to conduct a signal branch between at least one of the first switch end, the second switch end and the third switch end and the antenna end; The first duplexer is provided with a first connection end, and the first connection end is connected to the first switch end through a first transmission link; the first duplexer is configured to allow signals in the first communication frequency band and signals in the receiving frequency band in the third communication frequency band to pass through; the second duplexer is provided with a second connection end, and the second connection end is connected to the second switch end through a second transmission link, and is connected to the third switch end through a third transmission link; the second duplexer is configured to allow signals in the second communication frequency band and signals in the transmitting frequency band in the third communication frequency band to pass through; the first duplexer and the second duplexer are arranged in sequence in the first direction, the first duplexer and the radio frequency switch are arranged at intervals in the second direction, and the first direction and the second direction intersect; The filtering unit is connected to the third transmission link, and the filtering unit is configured to block signals in a receiving frequency band in the first communication frequency band; the filtering unit is located between the first duplexer and the radio frequency switch.

25. The radio frequency front-end module according to claim 24, characterized in that: The first duplexer is further provided with a first transmitting end and a first receiving end, the first transmitting end is configured to transmit a signal of a transmitting frequency band in the first communication frequency band, and the first receiving end is configured to receive a signal of a receiving frequency band in the first communication frequency band and a signal of a receiving frequency band in the third communication frequency band; The RF front-end module also includes a first transmit matching unit and a first receive matching unit arranged on the substrate, the first transmit matching unit is connected to the first transmit end, and the first receive matching unit is connected to the first receive end; the first transmit matching unit and the first receive matching unit are respectively located on opposite sides of the first duplexer.

26. The radio frequency front-end module according to claim 25, characterized in that: The second duplexer is further provided with a second transmitting end and a second receiving end, the second transmitting end is configured to transmit a signal of a transmitting frequency band in the second communication frequency band and a signal of a transmitting frequency band in the third communication frequency band, and the second receiving end is configured to receive a signal of a receiving frequency band in the second communication frequency band; The RF front-end module also includes a second transmit matching unit and a second receive matching unit arranged on the substrate, the second transmit matching unit is connected to the second transmit end, and the second receive matching unit is connected to the second receive end; the second transmit matching unit and the second receive matching unit are respectively located on opposite sides of the second duplexer.

27. The radio frequency front-end module according to claim 26, characterized in that: The first receiving matching unit and the second receiving matching unit are sequentially arranged in the first direction, and the first receiving matching unit and the second receiving matching unit are located on a side of the second duplexer away from the radio frequency switch; The first transmission matching unit, the second transmission matching unit and the second duplexer are arranged in sequence in the second direction, and the first transmission matching unit and the second transmission matching unit are located on a side of the second duplexer close to the radio frequency switch.

28. An electronic device, characterized in that: include: A radio frequency front-end module as claimed in any one of claims 1 to 27.

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