Radio frequency front-end module and communication equipment

Abstract

The utility model discloses a radio frequency front-end module and communication equipment, the radio frequency front-end module is used for being matched with an antenna module to receive and / or transmit signals, and the radio frequency front-end module comprises a signal receiving port, a signal transmitting port, a signal receiving branch, a signal transmitting branch, a gating switch and a phase shift network branch; wherein the phase shift network branch comprises a first branch switch and a phase shift network module connected with the first branch switch; the first branch switch has a first switching state and a second switching state which can be switched, and when the gating switch is in the first gating state, the first branch switch is in the first switching state, and a connection channel between the phase shift network module and the signal receiving port is conducted, so as to at least isolate part of signals input through the signal receiving port; and when the gating switch is in the second gating state, the first branch switch is in the second switching state, and the connection channel between the phase shift network module and the signal receiving port is switched on and is short-circuited or disconnected.

Description

Technical Field

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

[0002] With the maturity and popularization of wireless transmission technology, there are now quite a number of consumer electronic products, such as mobile phones, laptops or wireless network cards, which are equipped with RF front-end modules and antenna modules to transmit wireless signals.

[0003] The RF front-end module usually has a transmit path, a receive path, and a transmit / receive switch (Tx / Rx Switch) for switching between the transmit path and the receive path. However, when the RF front-end module transmits the RF signal to be transmitted to the antenna module, part of the RF signal to be transmitted will be radiated or coupled to the receive path, causing damage to the low-noise amplifier (LNA) or the transceiver unit at the back end of the low-noise amplifier. Since the RF signal to be transmitted has a high power, the signal coupled to the receive path is amplified by the low-noise amplifier, and the power generated may burn the internal circuit of the RF front-end module. Utility Model Content

[0004] Based on this, an embodiment of the present application provides a radio frequency front-end module and a communication device.

[0005] In a first aspect, an embodiment of the present application provides a radio frequency front-end module, the radio frequency front-end module comprising: a signal receiving port, a signal transmitting port, a signal receiving branch, a signal transmitting branch, a gating switch and a phase shift network branch;

[0006] The signal transmission branch is provided with a power amplifier, and the signal transmission branch is used to transmit a signal through the signal transmission port;

[0007] The signal receiving branch is provided with a low noise amplifier, and the signal receiving branch is used to receive a signal through the signal receiving port;

[0008] The gating switch has a first gating state and a second gating state that can be switched, and when the gating switch is in the first gating state, the gating switch connects the signal transmitting port with the antenna module so that the signal transmitting branch transmits the signal through the antenna module; when the gating switch is in the second gating state, the gating switch connects the signal receiving port with the antenna module so that the signal receiving branch receives the signal through the antenna module;

[0009] A phase-shift network branch, the phase-shift network branch comprising a first branch switch and a phase-shift network module connected to the first branch switch; wherein the first branch switch has a switchable first switch state and a second switch state, and when the gating switch is in the first gating state, the first branch switch is in the first switch state, and a connection channel between the phase-shift network module and the signal receiving port is turned on to at least isolate a portion of the signal input through the signal receiving port;

[0010] When the gating switch is in the second gating state, the first branch switch is in the second switch state, and the connection channel between the phase-shifting network module and the signal receiving port is short-circuited or disconnected.

[0011] In some embodiments, the phase shift network module includes at least an LC phase shift unit, wherein the LC phase shift unit is connected to the signal receiving port through a first branch switch and the LC phase shift unit is grounded.

[0012] In some implementations, the resonant frequency of the LC phase shift unit is set within the operating frequency band of the signal transmission branch.

[0013] In some embodiments, a first end of the LC phase shift unit is connected to a first end of the first branch switch, a second end of the first branch switch is connected to a signal receiving port and an input end of the low noise amplifier; and a second end of the LC phase shift unit is grounded.

[0014] In some embodiments, the LC phase shift unit includes a first capacitor subunit and an inductor subunit, the first end of the first capacitor subunit is connected to the first end of the first branch switch, and the second end of the first capacitor subunit is grounded; the first end of the inductor subunit is connected to the first end of the first capacitor subunit, and the second end of the inductor subunit is connected to the second end of the first capacitor subunit.

[0015] In some embodiments, the LC phase shift unit includes a first capacitor subunit and an inductor subunit.

[0016] A first end of the first capacitor subunit is connected to a first end of the first branch switch, a second end of the first capacitor subunit is connected to a first end of the inductor subunit, and a second end of the inductor subunit is grounded;

[0017] Alternatively, the first end of the inductor subunit is connected to the first end of the first branch switch, the second end of the inductor subunit is connected to the first end of the first capacitor subunit, and the second end of the first capacitor subunit is grounded.

[0018] In some embodiments, a first end of the LC phase shift unit is connected to a first end of the first branch switch and an input end of the low noise amplifier, and a second end of the LC phase shift unit is connected to a second end of the first branch switch and a signal receiving port.

[0019] In some embodiments, the LC phase shift unit includes a first capacitor subunit and an inductor subunit, the first end of the inductor subunit is connected to the first end of the first branch switch and the input end of the low noise amplifier, the second end of the inductor subunit is connected to the first end of the first capacitor subunit, and the second end of the first capacitor subunit is connected to the second end of the first branch switch and the signal receiving port; wherein the second end of the inductor subunit is grounded.

[0020] In some embodiments, the LC phase shift unit includes a second capacitor subunit, a first end of the second capacitor subunit is connected to the second end of the inductor subunit, and a second end of the second capacitor subunit is grounded.

[0021] In some embodiments, the phase-shift network module includes a first switch unit and a second switch unit, wherein the first end of the first switch unit is connected to the first end of the first branch switch, the second end of the first switch unit is connected to the signal receiving port and the first end of the second switch unit; and the second end of the second switch unit is grounded.

[0022] In some embodiments, the RF front-end module further includes a second branch switch, the second branch switch connecting the phase shift network branch and the input end of the low noise amplifier;

[0023] Wherein, when the gating switch is in the first gating state, the second branch switch disconnects the connection path between the phase-shifting network branch and the low-noise amplifier.

[0024] In a second aspect, an embodiment of the present application provides a communication device, including an antenna module and the aforementioned radio frequency front-end module.

[0025] It can be seen from the above technical solution that the RF front-end module provided in the present application is provided with a selection switch, and the selection switch is used to connect the antenna module adapted to the RF front-end module to the signal receiving port or the signal transmitting port. When the selection switch connects the signal transmitting port to the antenna module, the signal transmitting branch transmits the signal through the antenna module; when the selection switch connects the signal receiving port to the antenna module, the signal receiving branch receives the signal through the antenna module.

[0026] Furthermore, based on the fact that the signal transmitted by the signal transmitting branch can be coupled to the low-noise amplifier of the signal receiving branch through the signal receiving port, thereby affecting the signal receiving branch and even damaging the electronic components of the signal receiving branch, the present application sets a phase-shifting network branch. When the signal transmitting branch and the antenna module are adapted for operation, the first branch switch connects the phase-shifting network module to the signal receiving port, so as to utilize the phase-shifting network module to isolate part of the signal input to the signal receiving branch through the signal receiving port, thereby avoiding the situation where the signal transmitted by the signal transmitting branch when working is coupled to the signal receiving branch, causing damage to the components of the signal receiving branch.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a module structure block diagram of a communication device provided in an embodiment of the present application;

[0030] Figure 2 It is a schematic diagram of a circuit module structure of a specific implementation of a radio frequency front-end module provided in an embodiment of the present application;

[0031] Figure 3A It is a schematic diagram of the circuit module structure of the radio frequency front-end module provided in an embodiment of the present application in a signal transmission state;

[0032] Figure 3B It is a schematic diagram of the circuit module structure of the radio frequency front-end module provided in the embodiment of the present application in the receiving and transmitting state;

[0033] Figures 4 to 10 It is a circuit structure diagram of various deformation structures of the RF front-end module provided in the embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0038] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] See also Figure 1 , Figure 1 A schematic block diagram of a communication device provided in an embodiment of the present application.

[0040] like Figure 1 As shown, the communication device 100 realizes wireless communication with an external communication device through a built-in antenna device. The antenna device transmits radio frequency signals of relevant frequency bands to the outside through various modules inside it, and receives radio frequency signals of relevant frequency bands. Of course, the communication device 100 not only includes an antenna device, but also includes other modules, such as a signal processing device, a processor, a user interface, a memory, etc. The communication device includes but is not limited to a personal digital assistant (PDA), a mobile phone, a card in a laptop computer, a wireless tablet computer, etc.

[0041] like Figure 1 As shown, the antenna device in this example includes an RF front-end module 10 and an antenna module 20. The RF front-end module 10 can work in a transmission mode or a reception mode. The working mode of the RF front-end module 10 can be switched by a transmission / reception switch. When the RF front-end module 10 works in the transmission mode, the received RF analog signal is transmitted to the antenna module 20 to transmit the signal through the antenna module 20. When the RF front-end module 10 works in the reception mode, the RF front-end module 10 receives the RF analog signal received by the antenna module 20 to amplify, filter, and other processes the RF analog signal.

[0042] With the development of communication technology, in order to cope with the rapid growth of mobile data traffic and various new application scenarios in the future, the fifth generation mobile communication technology (5G) will become a development trend. Compared with traditional 4G or 3G technology, 5G technology has put forward more stringent requirements on the performance indicators such as the isolation of the RF front end. However, in the related technology, when the RF front end module transmits the RF signal to the antenna module via the power amplifier (PA), the transmitted RF signal will radiate or couple to the receiving path and cause component damage to the low noise amplifier (LNA) or the transceiver unit at the rear end of the low noise amplifier. Since the transmitted RF signal has a high power, although the transmit / receive switch has an attenuation effect, the power generated after amplification by the low noise amplifier may burn the internal circuit of the RF front end module.

[0043] Based on this, the RF front-end module 10 provided in the present application can solve the problem of component damage caused by signal coupling in the signal receiving branch.

[0044] See also Figure 2 A radio frequency front-end module 10 is used to adapt to an antenna module 20 to receive and / or transmit signals. The radio frequency front-end module 10 includes a signal receiving port 11, a signal transmitting port 12, a signal receiving branch 13, a signal transmitting branch 14, a gating switch 15 and a phase shift network branch 16.

[0045] Among them, the signal transmission branch 14 is provided with a power amplifier 141, and the signal transmission branch 14 is used to transmit the signal through the signal transmission port 12, wherein the power amplifier 141 is used to amplify the power of the radio frequency signal, and output the amplified radio frequency signal to the signal transmission port 12, so as to output it to the antenna module 20 through the signal transmission port 12, thereby radiating the radio frequency signal to the external space through the antenna module 20.

[0046] The signal receiving branch 13 is provided with a low noise amplifier 131 , and the signal receiving branch 13 is used to receive the radio frequency signal transmitted by the antenna module 20 through the signal receiving port 11 .

[0047] The gating switch 15 has a first gating state and a second gating state that can be switched, and when the gating switch 15 is in the first gating state, the gating switch 15 connects the signal transmission port 12 to the antenna module 20, so that the signal transmission branch 14 can transmit the radio frequency signal after power amplification by the power amplifier 141 to the antenna module 20, so as to transmit the signal through the antenna module 20, such as Figure 3A shown.

[0048] When the selection switch 15 is in the second selection state, the selection switch 15 connects the signal receiving port 11 to the antenna module 20, so that the signal receiving branch 13 receives the signal through the antenna module 20. Figure 3B shown.

[0049] Exemplarily, the RF front-end module 10 is provided with an antenna port for connecting to the antenna module 20. When the selection switch 15 is in the first selection state, the selection switch 15 connects the signal transmission port 12 with the antenna port so that the signal transmission branch 14 is connected to the antenna module 20 through the antenna port; when the selection switch 15 is in the second selection state, the selection switch 15 connects the signal receiving port 11 with the antenna port so that the signal receiving branch 13 is connected to the antenna module 20 through the antenna port.

[0050] The phase-shift network branch 16 includes a first branch switch 18 and a phase-shift network module 17 connected to the first branch switch 18. The first branch switch 18 has a switchable first switch state and a second switch state. When the gating switch 15 is in the first gating state, the first branch switch 18 is in the first switch state, and the connection channel between the phase-shift network module 17 and the signal receiving port 11 is turned on to at least isolate part of the signal input through the signal receiving port 11. When the gating switch 15 is in the second gating state, the first branch switch 18 is in the second switch state, and the connection channel between the phase-shift network module 17 and the signal receiving port 11 is turned on, short-circuited or disconnected.

[0051] It can be understood that the first switch state is the off state of the first branch switch 18, and the second switch state is the on state of the first branch switch 18, or the first switch state is the on state of the first branch switch 18, and the second switch state is the off state of the first branch switch 18. There is no limitation here, as long as the first branch switch 18 is in the first switch state, the connection channel between the phase-shift network module 17 and the signal receiving port 11 is connected, and when the first branch switch 18 is in the second switch state, the connection channel between the phase-shift network module 17 and the signal receiving port 11 is connected, short-circuited or disconnected.

[0052] That is, when it is necessary to access the antenna module 20 through the signal transmission branch 14 for signal transmission, the selection switch 15 connects the signal transmission port 12 with the antenna module 20. At this time, the signal transmission branch 14 can transmit signals through the antenna module 20. At the same time, the first branch switch 18 is in the first switch state, the connection channel between the phase shift network module 17 and the signal receiving port 11 is turned on, and the phase shift network module 17 is connected to the signal receiving port 11 through the first branch switch 18, thereby destroying the impedance matching between the signal receiving port 11 and the signal receiving branch 13. The coupled signal of the signal transmission branch 14 coupled to the signal receiving port 11 is isolated by the phase shift network module 17, thereby avoiding the signal transmitted by the signal transmission branch 14 when working. The signal is coupled to the signal receiving branch 13 and leaked to the low noise amplifier 131 of the signal receiving branch 13, causing damage to the related components of the signal receiving branch 13, such as Figure 3A shown.

[0053] When it is necessary to access the antenna module 20 through the signal receiving branch 13 for signal transmission, the selection switch 15 connects the signal receiving port 11 with the antenna module 20. At this time, the signal receiving branch 13 can receive signals through the antenna module 20. At the same time, the first branch switch 18 is in the second switch state, and the connection channel between the phase shift network module 17 and the signal receiving port 11 is short-circuited, so that the received signal is transmitted to the signal receiving branch 13 through the signal receiving port 11, and then transmitted to the signal processing device through the signal receiving branch 13. Figure 3B shown.

[0054] Optionally, the phase-shift network module 17 may be implemented by one or more circuit elements such as capacitors, inductors, resistors, switches, etc., or a combination thereof.

[0055] See also Figures 4 to 7 In some embodiments, the phase shift network module 17 at least includes an LC phase shift unit 171, wherein the LC phase shift unit 171 is connected to the signal receiving port 11 through the first branch switch 18 and the LC phase shift unit 171 is grounded.

[0056] In this embodiment, by setting the LC phase shift unit 171, when the signal transmitting branch 14 is connected to the antenna module 20, the LC phase shift unit 171 is connected to the signal transmitting port 11, thereby destroying the impedance matching between the signal receiving port 11 and the signal receiving branch 13. At the same time, the LC phase shift unit 171 is used to isolate part of the signal input to the signal receiving branch 13 through the signal receiving port 11, thereby avoiding the signal transmitted by the signal transmitting branch when it is working. The signal is coupled to the signal receiving branch, causing damage to the low-noise amplifier in the signal receiving branch.

[0057] Optionally, the resonant frequency of the LC phase shift unit 171 is set within the operating frequency band of the signal transmission branch 14. Based on the resonant frequency of the LC phase shift unit 171 being within the operating frequency band of the signal transmission branch 14, the LC phase shift unit 171 can better isolate the signal transmitted by the signal transmission branch 14 from being coupled to the signal of the signal receiving branch.

[0058] like Figures 4 to 7 In some embodiments, the LC phase shift unit 171 is connected in series with the first switch branch 18, the first switch state of the first switch branch 18 is the on state, and the second switch state is the off state. When the first switch branch 18 is in the first switch state, i.e., the on state, the LC phase shift unit 171 is connected to the signal transmission port 11; when the first switch branch 18 is in the second switch state, i.e., the off state, the connection between the LC phase shift unit 171 and the signal transmission port 11 is disconnected.

[0059] like Figure 4 As shown, the first end of the LC phase shift unit 171 is connected to the first end of the first branch switch 18, and the second end of the first branch switch 18 is connected to the signal receiving port 11 and the input end of the low noise amplifier 131; the second end of the LC phase shift unit 171 is grounded.

[0060] like Figure 4 As shown, the LC phase shift unit 171 includes a first capacitor subunit 1711 and an inductor subunit 1712. The first capacitor subunit 1711 and the inductor subunit 1712 can be connected in parallel. The first end of the first capacitor subunit 1711 is connected to the first end of the first branch switch 18, and the second end of the first capacitor subunit 1711 is grounded; the first end of the inductor subunit 1712 is connected to the first end of the first capacitor subunit 1711, and the second end of the inductor subunit 1712 is connected to the second end of the first capacitor subunit 1711.

[0061] Optionally, the LC phase shift unit 171 includes a first capacitor subunit 1711 and an inductor subunit 1712, and the first capacitor subunit 1711 and the inductor subunit 1712 can be connected in series. Figure 5 As shown, the first end of the first capacitor subunit 1711 is connected to the first end of the first branch switch 18, the second end of the first capacitor subunit 1711 is connected to the first end of the inductor subunit 1712, and the second end of the inductor subunit 1712 is grounded. Figure 6 As shown, the first end of the inductor unit 1712 is connected to the first end of the first branch switch 18, the second end of the inductor unit 1712 is connected to the first end of the first capacitor unit 1711, and the second end of the first capacitor unit 1711 is grounded.

[0062] Exemplarily, when the switch 15 is selected to connect the signal transmitting port 12 with the antenna module 20, the signal transmitting branch 14 can transmit signals through the antenna module 20. At this time, the first branch switch 18 is in the first switching state, i.e., the on state, and the LC phase shifter 171 of the phase shifter network module 17 is connected to the signal receiving port 11, thereby destroying the impedance matching between the signal receiving port 11 and the signal receiving branch 13. At the same time, based on the connection between the LC phase shifter 171 and the signal receiving port 11, the signal coupled through the signal receiving port 11 and input into the signal receiving branch 13 is isolated by the LC phase shifter 171, thereby avoiding the signal transmitted by the signal transmitting branch 14 when it is working. The signal is coupled to the signal receiving branch 13 and leaked to the low-noise amplifier 131 of the signal receiving branch 13, causing damage to the related components of the signal receiving branch 13.

[0063] When it is necessary to access the antenna module 20 through the signal receiving branch 13 for signal transmission, the selection switch 15 connects the signal receiving port 11 with the antenna module 20, and at this time, the signal receiving branch 13 can receive signals through the antenna module 20. At the same time, the first branch switch 18 is in the second switch state, that is, the off state, and the connection channel between the phase shift network module 17 and the signal receiving port 11 is disconnected, so as not to affect the matching between the signal receiving port 11 and the signal receiving branch 13, so that the received signal can be normally transmitted to the signal receiving branch 13 through the signal receiving port 11, so as to be transmitted to the signal processing device through the signal receiving branch 13.

[0064] See also Figure 7 In some embodiments, the RF front-end module 10 further includes a second branch switch 19, which connects the phase-shift network branch 16 and the input end of the low-noise amplifier 131; wherein, when the selection switch 15 is in the first selection state, the second branch switch 19 disconnects the connection path between the phase-shift network branch 16 and the low-noise amplifier 131, thereby strengthening the isolation between the signal input end 11 and the low-noise amplifier 131, so that the coupled signal cannot be input into the low-noise amplifier 131 through the signal input end 11.

[0065] See also Figures 8 to 9 In some embodiments, the LC phase shift unit 171 is connected in parallel with the first switch branch 18, the first switch state of the first switch branch 18 is the off state, and the second switch state is the on state. When the first switch branch 18 is in the first switch state, i.e., the off state, the LC phase shift unit 171 is connected to the signal transmission port 11; when the first switch branch 18 is in the second switch state, i.e., the off state and the on state, the path between the LC phase shift unit 171 and the signal transmission port 11 is short-circuited.

[0066] A first end of the LC phase shift unit 171 is connected to a first end of the first branch switch 18 and an input end of the low noise amplifier 131 , and a second end of the LC phase shift unit 171 is connected to a second end of the first branch switch 18 and the signal receiving port 11 .

[0067] Optionally, the LC phase shift unit 171 includes a first capacitor subunit 1711 and an inductor subunit 1712, the first end of the inductor subunit 1712 is connected to the first end of the first branch switch 18 and the input end of the low noise amplifier 131, the second end of the inductor subunit 1712 is connected to the first end of the first capacitor subunit 1711, and the second end of the first capacitor subunit 1711 is connected to the second end of the first branch switch 18 and the signal receiving port 11; wherein, the second end of the inductor subunit 1712 is grounded.

[0068] like Fig. 9 As shown, optionally, the LC phase shift unit 171 includes a second capacitor subunit 1713, a first end of the second capacitor subunit 1713 is connected to the second end of the inductor subunit 1712, and a second end of the second capacitor subunit 1713 is grounded.

[0069] Exemplarily, when the switch 15 is selected to connect the signal transmitting port 12 with the antenna module 20, the signal transmitting branch 14 can transmit signals through the antenna module 20. At this time, the first branch switch 18 is in the first switching state, and the LC phase shifter 171 of the phase shifter network module 17 is connected to the signal receiving port 11, thereby destroying the impedance matching between the signal receiving port 11 and the signal receiving branch 13. At the same time, based on the connection between the LC phase shifter 171 and the signal receiving port 11, the signal coupled through the signal receiving port 11 and input into the signal receiving branch 13 is filtered and isolated by the LC phase shifter 171 to avoid the signal transmitted by the signal transmitting branch 14 when it is working. The signal is coupled to the signal receiving branch 13 and leaked to the low-noise amplifier 131 of the signal receiving branch 13, causing damage to the related components of the signal receiving branch 13.

[0070] When it is necessary to access the antenna module 20 through the signal receiving branch 13 for signal transmission, the selection switch 15 connects the signal receiving port 11 with the antenna module 20, and at this time, the signal receiving branch 13 can receive signals through the antenna module 20. At the same time, the first branch switch 18 is in the second switch state, and the connection channel between the phase shift network module 17 and the signal receiving port 11 is short-circuited, so that the received signal is transmitted to the signal receiving branch 13 through the signal receiving port 11, and then transmitted to the signal processing device through the signal receiving branch 13.

[0071] See also Fig.10In some embodiments, the phase-shift network module 17 includes a first switch unit 174 and a second switch unit 175, the first end of the first switch unit 174 is connected to the first end of the first branch switch 18, the second end of the first switch unit 174 and the second end of the first branch switch 18 are both connected to the signal receiving port 11 and the first end of the second switch unit 175; the second end of the second switch unit 175 is grounded.

[0072] Exemplarily, when the switch 15 is selected to connect the signal transmitting port 12 with the antenna module 20, the signal transmitting branch 14 can transmit signals through the antenna module 20. At this time, the first branch switch 18 is in the off state, the phase shift network module 17 is connected to the signal receiving port 11, and the first switch unit 174 of the phase shift network module 17 is disconnected, the signal receiving port 11 is isolated from the input end of the low noise amplifier 131, and the second switch unit 175 is closed to ground the signal receiving port 11, thereby destroying the impedance matching between the signal receiving port 11 and the signal receiving branch 13. At the same time, based on the connection between the phase shift network module 17 and the signal receiving port 11, the signal coupled through the signal receiving port 11 and input into the signal receiving branch 13 is isolated by the phase shift network module 17, so as to avoid the signal transmitted by the signal transmitting branch 14 when it is working. The signal is coupled to the signal receiving branch 13 and leaked to the low noise amplifier 131 of the signal receiving branch 13, causing damage to the related components of the signal receiving branch 13.

[0073] When it is necessary to access the antenna module 20 through the signal receiving branch 13 for signal reception, the selection switch 15 connects the signal receiving port 11 with the antenna module 20, and at this time, the signal receiving branch 13 can receive signals through the antenna module 20. At the same time, the first branch switch 18 is closed and in the on state, the connection channel between the phase shift network module 17 and the signal receiving port 11 is short-circuited, and the first switch unit 174 of the phase shift network module 17 is closed, and the second switch unit 175 is disconnected, so that the received signal is transmitted to the signal receiving branch 13 through the signal receiving port 11, so as to be transmitted to the signal processing device through the signal receiving branch 13.

[0074] Furthermore, during the signal reception process, since both the first branch switch 18 and the first switch unit 174 are turned on, the on-impedance of the two connected in parallel is small, which is beneficial to reducing the loss of the RF signal in the transmission path from the signal receiving port 11 to the input end of the low noise amplifier 121.

[0075] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0076] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A radio frequency front-end module, characterized in that: The RF front-end module includes: a signal receiving port, a signal transmitting port, a signal receiving branch, a signal transmitting branch, a gating switch and a phase shift network branch; The signal transmission branch is provided with a power amplifier, and the signal transmission branch is used to transmit a signal through the signal transmission port; The signal receiving branch is provided with a low noise amplifier, and the signal receiving branch is used to receive a signal through the signal receiving port; A gating switch having a first gating state and a second gating state that can be switched, and when the gating switch is in the first gating state, the gating switch connects the signal transmitting port with the antenna module so that the signal transmitting branch transmits a signal through the antenna module; when the gating switch is in the second gating state, the gating switch connects the signal receiving port with the antenna module so that the signal receiving branch receives a signal through the antenna module; A phase-shift network branch, the phase-shift network branch comprising a first branch switch and a phase-shift network module connected to the first branch switch; wherein the first branch switch has a switchable first switch state and a second switch state, and when the gating switch is in the first gating state, the first branch switch is in the first switch state, and a connection channel between the phase-shift network module and the signal receiving port is turned on to at least isolate a portion of the signal input through the signal receiving port; When the gating switch is in the second gating state, the first branch switch is in the second switch state, and the connection channel between the phase-shifting network module and the signal receiving port is short-circuited or disconnected.

2. The RF front-end module according to claim 1, characterized in that: The phase shift network module at least includes an LC phase shift unit, wherein the LC phase shift unit is connected to the signal receiving port through the first branch switch and the LC phase shift unit is grounded.

3. The RF front-end module according to claim 2, characterized in that: The resonant frequency of the LC phase shift unit is set within the working frequency band of the signal transmission branch.

4. The RF front-end module according to claim 2, characterized in that: The first end of the LC phase shift unit is connected to the first end of the first branch switch, the second end of the first branch switch is connected to the signal receiving port and the input end of the low noise amplifier; the second end of the LC phase shift unit is grounded.

5. The RF front-end module according to claim 4, characterized in that: The LC phase shift unit includes a first capacitor subunit and an inductor subunit, wherein the first end of the first capacitor subunit is connected to the first end of the first branch switch, and the second end of the first capacitor subunit is grounded; the first end of the inductor subunit is connected to the first end of the first capacitor subunit, and the second end of the inductor subunit is connected to the second end of the first capacitor subunit.

6. The RF front-end module according to claim 4, characterized in that: The LC phase shift unit includes a first capacitor subunit and an inductor subunit, wherein a first end of the first capacitor subunit is connected to a first end of the first branch switch, a second end of the first capacitor subunit is connected to a first end of the inductor subunit, and a second end of the inductor subunit is grounded; Alternatively, the first end of the inductor unit is connected to the first end of the first branch switch, the second end of the inductor unit is connected to the first end of the first capacitor unit, and the second end of the first capacitor unit is grounded.

7. The RF front-end module according to claim 2, characterized in that: The first end of the LC phase shift unit is connected to the first end of the first branch switch and the input end of the low noise amplifier, and the second end of the LC phase shift unit is connected to the second end of the first branch switch and the signal receiving port.

8. The RF front-end module according to claim 7, characterized in that: The LC phase shift unit includes a first capacitor subunit and an inductor subunit, wherein the first end of the inductor subunit is connected to the first end of the first branch switch and the input end of the low noise amplifier, the second end of the inductor subunit is connected to the first end of the first capacitor subunit, and the second end of the first capacitor subunit is connected to the second end of the first branch switch and the signal receiving port; wherein the second end of the inductor subunit is grounded.

9. The RF front-end module according to claim 8, characterized in that: The LC phase shift unit includes a second capacitor subunit, a first end of the second capacitor subunit is connected to the second end of the inductor subunit, and a second end of the second capacitor subunit is grounded.

10. The RF front-end module according to claim 1, characterized in that: The phase-shift network module includes a first switch unit and a second switch unit, wherein the first end of the first switch unit is connected to the first end of the first branch switch, the second end of the first switch unit is connected to the signal receiving port and the first end of the second switch unit; and the second end of the second switch unit is grounded.

11. The RF front-end module according to any one of claims 1 to 10, characterized in that: The RF front-end module further includes a second branch switch, wherein the second branch switch connects the phase shift network branch and the input end of the low noise amplifier; Wherein, when the gating switch is in the first gating state, the second branch switch disconnects the connection path between the phase-shift network branch and the low-noise amplifier.

12. A communication device, characterized in that: The communication device includes an antenna module and a radio frequency front-end module as described in any one of claims 1-11.

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