Radio frequency front-end circuit and mobile terminal

Abstract

The utility model discloses a radio frequency front-end circuit and a mobile terminal, and the radio frequency front-end circuit comprises an antenna radiator which is connected with a feeder line; the first frequency divider is provided with a first common end and a plurality of first frequency division ends, the first common end is connected with the feeder line, and each first frequency division end is grounded through a first matching device correspondingly. According to the invention, mutual influence between matching of different frequency bands can be relieved, the debugging difficulty is reduced, and the antenna performance is improved.

Description

Technical Field

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

[0002] Usually a mobile terminal supports multiple frequency bands, and the antenna of the mobile terminal is also required to support multiple frequency bands, such as high, medium and low frequency bands. In conventional antenna matching circuit design, the matching circuits of various frequency bands are shared. When the antenna matching and debugging of one frequency band is completed, the performance of another frequency band will be affected when debugging. That is, the matching of different frequency bands affects each other, resulting in problems such as difficulty in debugging and attenuation of antenna performance. Utility Model Content

[0003] The present application provides a radio frequency front-end circuit and a mobile terminal, which can alleviate the mutual influence between matching of different frequency bands, thereby reducing the difficulty of debugging and improving antenna performance.

[0004] The present application provides a radio frequency front-end circuit, including an antenna radiator and a first frequency divider, wherein the antenna radiator is connected to a feeder; the first frequency divider has a first common end and multiple first frequency divider ends, wherein the first common end is connected to the feeder, and each first frequency divider end is correspondingly grounded through a first matching device.

[0005] In some embodiments, the RF front-end circuit also includes a second frequency divider, a third frequency divider and multiple first matching circuits, the second frequency divider has a second common terminal and multiple second frequency divider terminals, and the second common terminal is connected to the antenna radiator; the third frequency divider has a third common terminal and multiple third frequency divider terminals, and the third common terminal is connected to the RF chip through a feeder; the number of first matching circuits is the same as the number of second frequency divider terminals, and each second frequency divider terminal is connected to the corresponding third frequency divider terminal through a first matching circuit.

[0006] In the RF front-end circuit of some embodiments, the first matching circuit includes a second matching device, one end of the second matching device is connected to the second frequency division end, and the other end of the second matching device is connected to a third frequency division end corresponding to the second frequency division end.

[0007] In the RF front-end circuit in some embodiments, the first matching circuit includes a third matching device, a fourth matching device and a fifth matching device, one end of the third matching device and one end of the fourth matching device are both connected to the second frequency division end, the other end of the third matching device and one end of the fifth matching device are both connected to the third frequency division end corresponding to the second frequency division end, and the other end of the fourth matching device and the other end of the fifth matching device are both grounded.

[0008] In some embodiments, the RF front-end circuit also includes a fourth frequency divider, the fourth frequency divider has a fourth common terminal and multiple fourth frequency division terminals, the fourth common terminal and the third common terminal are both connected to the RF chip through a feeder line, and each fourth frequency division terminal is correspondingly grounded through a sixth matching device.

[0009] In the RF front-end circuit of some embodiments, the first matching device or the sixth matching device is any one of a capacitor, an inductor, and a resistor.

[0010] An embodiment of the present application also provides a radio frequency front-end circuit, which includes an antenna radiator, a fifth frequency divider, a sixth frequency divider and multiple second matching circuits; the fifth frequency divider has a fifth common terminal and multiple fifth frequency divider terminals, and the fifth common terminal is connected to the antenna radiator; the sixth frequency divider has a sixth common terminal and multiple sixth frequency divider terminals, and the sixth common terminal is connected to the radio frequency chip through a feeder; the number of second matching circuits is the same as the number of fifth frequency divider terminals, and each fifth frequency divider terminal is connected to the corresponding sixth frequency divider terminal through a second matching circuit.

[0011] In the RF front-end circuit of some embodiments, the second matching circuit includes a seventh matching device, one end of the seventh matching device is connected to the fifth frequency division end, and the other end of the seventh matching device is connected to the sixth frequency division end corresponding to the fifth frequency division end.

[0012] In the RF front-end circuit in some embodiments, the second matching circuit includes an eighth matching device, a ninth matching device and a tenth matching device, one end of the eighth matching device and one end of the ninth matching device are both connected to the fifth frequency division end, the other end of the eighth matching device and one end of the ninth matching device are both connected to the sixth frequency division end corresponding to the fifth frequency division end, and the other end of the ninth matching device and the other end of the tenth matching device are both grounded.

[0013] An embodiment of the present application also provides a mobile terminal, which includes the radio frequency front-end circuit as described above.

[0014] The present application provides a radio frequency front-end circuit and a mobile terminal, wherein the radio frequency front-end circuit separates the signals of each frequency band by setting a frequency divider, and sets respective matching devices at each frequency division end of the frequency divider for separate matching and debugging, thereby avoiding mutual influence between the matching of different frequency bands, thereby reducing the difficulty of debugging and improving antenna performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0016] Figure 1 This is a first structural block diagram of the RF front-end circuit provided in an embodiment of the present application.

[0017] Figure 2 A second structural block diagram of the RF front-end circuit provided in an embodiment of the present application.

[0018] Figure 3 A first structural block diagram of a first matching circuit in a radio frequency front-end circuit provided in an embodiment of the present application.

[0019] Figure 4 A second structural block diagram of the first matching circuit in the RF front-end circuit provided in an embodiment of the present application.

[0020] Figure 5 This is a third structural block diagram of the RF front-end circuit provided in an embodiment of the present application.

[0021] Figure 6 This is a fourth structural block diagram of the RF front-end circuit provided in an embodiment of the present application.

[0022] Figure 7 This is a first structural block diagram of the second matching circuit in the RF front-end circuit provided in an embodiment of the present application.

[0023] Figure 8 A second structural block diagram of the second matching circuit in the RF front-end circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely 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 creative work are within the scope of protection of the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] See also Figure 1, this embodiment provides a radio frequency front-end circuit, which includes an antenna radiator 10 and a first frequency divider 21; wherein the antenna radiator 10 is connected to one end of a feeder 30, and the feeder 30 refers to a line for transmitting radio frequency signals, and usually one end of the feeder 30 is connected to the antenna radiator 10, and the other end of the feeder 30 is connected to the radio frequency chip. The antenna radiator 10 is used to convert the electrical signal on the feeder 30 into an electromagnetic wave and radiate it out, or to convert the electromagnetic wave in the air into an electrical signal and transmit it to the feeder 30. The first frequency divider 21 has a first common terminal N1 and a plurality of first frequency divider terminals, such as a low frequency terminal D1, an intermediate frequency terminal E1, and a high frequency port F1. The first common terminal N1 is connected to the feeder 30, and each first frequency divider terminal is correspondingly grounded through a first matching device 41 to form a different radio frequency path; the frequency divider is used to distribute radio frequency signals to different radio frequency paths according to different frequencies, or to merge radio frequency signals of different frequencies into the same radio frequency path.

[0027] Among them, the frequency divider acts as a frequency selection device, and each port only allows signals in the corresponding frequency range to pass through, and cuts off signals of other frequencies. For example, the low-frequency port of the frequency divider supports the passage of signals with frequencies of 600MHz to 1GHz; the intermediate-frequency port of the frequency divider supports the passage of signals with frequencies of 1.5GHz to 2.2GHz; and the high-frequency port of the frequency divider supports the passage of signals with frequencies of 2500MHz to 2700MHz; the common port of the frequency divider supports the frequency range of all high, medium and low frequency bands, that is, allows signals of all frequency bands to pass through. In this embodiment, the signals of each frequency band are separated by setting a frequency divider, and respective matching devices are set at each frequency division end of the frequency divider for separate matching and debugging, thereby avoiding mutual influence between the matching of different frequency bands, thereby reducing the difficulty of debugging and improving the antenna performance.

[0028] In this embodiment, the frequency divider can be provided with three frequency division ends, namely, a high frequency end, an intermediate frequency end and a low frequency end, and the end of the feeder 30 is connected to the antenna radiator 10. On the feeder 30, the first frequency divider 21 is connected to the position close to the antenna radiator 10, the common end of the first frequency divider 21 is connected to the feeder 30, and the three frequency division ends of the frequency divider are each connected to a first matching device 41, and the other end of each first matching device 41 is grounded. When the antenna transmits a low-frequency signal, that is, transmits a low-frequency signal or receives a low-frequency signal, for example, the low-frequency signal is a signal in the B8 frequency band, when the current flows through the first frequency divider 21, it can only flow to the low-frequency end, and is connected to the ground through the first matching device 41 at the low-frequency end, and the other ends are cut off for the low-frequency signal, and the signal current does not flow. That is, at this time, only the first matching device 41 on the low-frequency end has an effect on the low-frequency signal, and the first matching devices 41 connected to the other intermediate frequency ends and the high frequency end do not have an effect on the low-frequency signal at this time, and will not affect the impedance matching of the antenna to the low-frequency signal at this time.

[0029] When the antenna radiator 10 transmits an intermediate frequency signal, for example, the intermediate frequency signal is a signal in the B1 frequency band, when the current flows through the first frequency divider 21, it can only flow to the intermediate frequency end, and is connected to the ground through the matching device at the intermediate frequency end. The other ends are cut off from the intermediate frequency signal, and the signal current does not flow. That is, at this time, only the first matching device 41 on the intermediate frequency end has an effect on the intermediate frequency signal, and the first matching devices 41 connected to the other low-frequency end and high-frequency end have no effect on the intermediate frequency signal at this time, and will not affect the impedance matching of the antenna to the intermediate frequency signal at this time.

[0030] When the antenna radiator 10 transmits a high-frequency signal, for example, the high-frequency signal is a signal in the B7 frequency band, when the current flows through the first frequency divider 21, it can only flow to the high-frequency end, and is connected to the ground through the first matching device 41 at the high-frequency end. The other frequency divider ends are cut off from the intermediate frequency signal, and the signal current does not flow. That is, at this time, only the matching device on the high-frequency end has an effect on the high-frequency signal, and the matching devices connected to the other low-frequency end and the intermediate frequency end do not work on the high-frequency signal at this time, and will not affect the impedance matching of the antenna to the high-frequency signal at this time.

[0031] When multiple frequency band signals are transmitted simultaneously on the antenna radiator 10, including transmitting and receiving signals, such as transmitting signals in the low-frequency B8 frequency band and signals in the intermediate frequency B1 frequency band at the same time, the two frequency band signals are separated by the first frequency divider 21 and go to different ports when passing through the first frequency divider 21, and the signal current of the B8 frequency band only passes through the low-frequency end, and the first matching device 41 connected to the low-frequency end is used and connected to the ground. The signal current of the B1 frequency band only passes through the intermediate frequency end, and the first matching device 41 connected to the intermediate frequency end is used and connected to the ground. That is, the matching device at the low-frequency end only acts on the signal of the low-frequency B8 frequency band, and the impedance of the antenna in the low-frequency B8 frequency band is adjusted to match the impedance of the feeder 30 and the RF chip to reduce signal reflection. The first matching device 41 at the intermediate frequency end only acts on the signal of the intermediate frequency B1 frequency band, and the impedance of the antenna in the intermediate frequency B1 frequency band is adjusted to match the impedance of the feeder 30 and the RF chip to reduce signal reflection. The matching of the low-frequency end connection and the matching of the intermediate frequency end connection do not affect each other. The low-frequency matching does not affect the intermediate frequency signal, and the intermediate frequency matching does not affect the low-frequency signal. The low frequency and the intermediate frequency are matched separately.

[0032] See also Figure 2In some embodiments, the RF front-end circuit also includes a second frequency divider 22, a third frequency divider 23 and multiple first matching circuits 51, the second frequency divider 22 has a second common terminal N2 and multiple second frequency division terminals, and the second common terminal N2 is connected to the antenna radiator 10; the third frequency divider 23 has a third common terminal N3 and multiple third frequency division terminals, and the third common terminal N3 is connected to the RF chip through a feeder 30; the number of first matching circuits 51 is the same as the number of second frequency division terminals, and each second frequency division terminal is connected to the corresponding third frequency division terminal through a first matching circuit 51. Among them, the three frequency division ends of the second frequency divider 22 are respectively the low frequency end D2, the intermediate frequency end E2 and the high frequency end F2, and the three frequency division ends of the third frequency divider are respectively the low frequency end D3, the intermediate frequency end E3 and the high frequency end F3; the low frequency end of the second frequency divider 22 is connected to the low frequency end of the third frequency divider 23 through the first matching circuit 51, and the high frequency end of the second frequency divider 22 is connected to the high frequency end of the third frequency divider 23 through the first matching circuit 51, and the intermediate frequency end of the second frequency divider 22 is connected to the intermediate frequency end of the third frequency divider 23 through the first matching circuit 51. In this embodiment, a circuit mode of a group of parallel matching and a group of series matching is used, and the series matching and parallel matching work in the same frequency band to adjust the antenna impedance, and the series and parallel matching of the medium, high and low frequencies are independent of each other.

[0033] See also Figure 3 As an embodiment, the first matching circuit 51 includes a second matching device 42, one end of the second matching device 42 is connected to the second frequency dividing end, and the other end of the second matching device 42 is connected to the third frequency dividing end corresponding to the second frequency dividing end. That is, in this embodiment, each first matching circuit 51 is provided with a matching device, which is equivalent to connecting a matching device in series between the same frequency dividing ends of the second frequency divider 22 and the third frequency divider 23.

[0034] See also Figure 4 As another embodiment, the first matching circuit 51 includes a third matching device 43, a fourth matching device 44 and a fifth matching device 45, one end of the third matching device 43 and one end of the fourth matching device 44 are both connected to the second frequency division end, the other end of the third matching device 43 and one end of the fifth matching device 45 are both connected to the third frequency division end corresponding to the second frequency division end, and the other end of the fourth matching device 44 and the other end of the fifth matching device 45 are both grounded. In this embodiment, three matching devices are arranged between the same frequency division ends of the second frequency divider 22 and the third frequency divider 23, wherein the third matching device 43 is connected in series between the two frequency division ends, and the fourth matching device 44 and the fifth matching device 45 are connected in parallel to the two ends of the third matching device 43, respectively.

[0035] See also Figure 5In some embodiments, the RF front-end circuit further includes a fourth frequency divider 24, the fourth frequency divider 24 has a fourth common terminal N4 and a plurality of fourth frequency divider terminals, for example, three frequency divider terminals are respectively D4, E4 and F4, the fourth common terminal N4 and the third common terminal N3 are connected to the RF chip through a feeder 30, and each fourth frequency divider terminal is correspondingly grounded through a sixth matching device 46. In this embodiment, multiple groups of series matching and multiple groups of parallel matching are combined, for example, one group of series matching and two groups of parallel matching, and the series matching and parallel matching work together in the same frequency band to adjust the antenna impedance. The series and parallel matching of high frequency, intermediate frequency and low frequency are independent of each other. Of course, in some embodiments, two groups of series matching and two groups of parallel matching, or a combination of multiple groups of series matching and multiple groups of parallel matching can also be set, which can be set according to actual needs, and this application will not elaborate on this.

[0036] As an embodiment, the first matching device 41, the second matching device 42, the third matching device 43, the fourth matching device 44, the fifth matching device 45 and the sixth matching device 46 are any one of a capacitor, an inductor and a resistor. In this embodiment, capacitors, resistors or inductors are provided as matching devices to adjust the antenna impedance to match the impedance of the feed line 30 and the impedance of the RF chip, thereby reducing RF signal reflection and improving radiation performance.

[0037] See also Figure 6 The embodiment of the present application also provides a radio frequency front-end circuit, which includes an antenna radiator 10, a fifth frequency divider 25, a sixth frequency divider 26 and a plurality of second matching circuits 52, the fifth frequency divider 25 having a fifth common terminal N5 and a plurality of fifth frequency division terminals, for example, having three frequency division terminals D5, E5 and F5, and the fifth common terminal N5 is connected to the antenna radiator 10; the sixth frequency divider 26 having a sixth common terminal N6 and a plurality of sixth frequency division terminals, for example, having three frequency division terminals D6, E6 and F6; the sixth common terminal N6 is connected to the radio frequency chip through a feeder 30; a plurality of second matching circuits 52, the number of the second matching circuits 52 is the same as the number of the fifth frequency division terminals, and each fifth frequency division terminal is connected to the corresponding sixth frequency division terminal through a second matching circuit 52.

[0038] Among them, the fifth frequency divider 25 is a front-end frequency divider, and the sixth frequency divider 26 is a rear-end frequency divider; the antenna radiator 10 in this embodiment is connected to the common port of the front-end frequency divider through the feeder 30, and the low-frequency end, the intermediate frequency end and the high-frequency port of the front-end frequency divider are each connected to a second matching circuit 52. The rear end of the second matching circuit 52 is connected to one of the low-frequency end, the intermediate frequency port and the high-frequency port corresponding to the rear-end frequency divider, and the front end and the rear end of the second matching circuit 52 are connected to ports in the same frequency range, that is, if the second matching circuit 52 is connected to the low-frequency end of the front-end frequency divider, the other end is connected to the low-frequency end of the rear-end frequency divider; and the common end of the rear-end frequency divider is connected to the RF chip through the feeder 30. The number of frequency dividers required in this embodiment is relatively small, specifically two frequency dividers are set, and will not be further increased with the increase of frequency bands, so that too high cost is not required, thereby controlling the further increase of material cost.

[0039] In this embodiment, the matching is set in series. When the antenna receives a low-frequency signal, such as a signal in the B8 frequency band, the current flows through the antenna into the common port of the front-end divider. At the front-end divider, the low-frequency signal can only flow through the low-frequency port, and cannot flow through the intermediate frequency and high frequency ports. The low-frequency B8 frequency band signal passes through the second matching circuit 52 connected to the low-frequency end, and then flows to the low-frequency end of the rear-end divider, and then to the common port of the rear-end divider, and is transmitted to the RF chip through the feeder 30 for signal demodulation. That is, at this time, only the second matching circuit 52 connected to the low-frequency end is effective for the low-frequency signal, and the second matching circuits 52 at the high-frequency end and the intermediate-frequency end do not have low-frequency current flowing through them, and do not act on the low-frequency signal.

[0040] When the antenna radiator 10 is transmitting a low-frequency signal, such as a signal in the B8 frequency band, the current is output from the RF chip and transmitted to the common port of the back-end frequency divider through the feeder 30. At the frequency divider, the low-frequency signal can only flow through the low-frequency end, and cannot flow through the intermediate frequency end and the high frequency end. The low-frequency B8 frequency band signal passes through the second matching circuit 52 connected to the low-frequency end, then flows to the low-frequency end of the front-end frequency divider, and then to the common end of the front-end frequency divider, and is transmitted to the antenna radiator 10 through the feeder 30, and is emitted through the antenna radiator 10. That is, at this time, only the second matching circuit 52 connected to the low-frequency end is effective for the low-frequency signal, and the second matching circuits 52 at the high frequency end and the intermediate frequency end do not have low-frequency current flowing through them, and do not act on the low-frequency signal.

[0041] Similarly, when the antenna radiator 10 operates at an intermediate frequency or a high frequency, only the matching circuit connected to the corresponding end works on the corresponding frequency band, and the matching circuits connected to other frequency division ends will not affect this frequency band.

[0042] When the mobile terminal transmits and receives signals at the same time, the transmission signal and the reception signal flow through the feeder 30 or the frequency divider or the matching circuit at the same time in opposite directions without affecting each other.

[0043] When the mobile terminal works in multiple frequency bands at the same time, for example, when working in the B1 frequency band and the B8 frequency band at the same time, the received signals of the B1 frequency band and the B8 frequency band are received from the antenna radiator 10, and are separated and go through different ports of the frequency divider when flowing through the front-end frequency divider, the signal of the B1 frequency band goes through the intermediate frequency end, and the signal of the B8 frequency band goes through the low frequency end; then the signal of the B1 frequency band passes through the second matching circuit 52 connected to the intermediate frequency end, and the signal of the B8 frequency band passes through the second matching circuit 52 connected to the low frequency end. Then the signal of the B1 frequency band and the signal of the B8 frequency band pass through the intermediate frequency end and the low frequency end of the rear-end frequency divider respectively, and are combined into one channel at the common end of the rear-end frequency divider, and are transmitted to the RF chip through the feeder 30 for demodulation.

[0044] See also Figure 7 As an embodiment, the second matching circuit 52 includes a seventh matching device 47, one end of the seventh matching device 47 is connected to the fifth frequency dividing end, and the other end of the seventh matching device 47 is connected to the sixth frequency dividing end corresponding to the fifth frequency dividing end; that is, in this embodiment, each first matching circuit 51 is provided with a matching device, which is equivalent to connecting a matching device in series between the same frequency dividing ends of the fifth frequency divider 25 and the sixth frequency divider 26.

[0045] See also Figure 8 As an embodiment, the second matching circuit 52 includes an eighth matching device 48, a ninth matching device 49 and a tenth matching device 410, one end of the eighth matching device 48 and one end of the ninth matching device 49 are both connected to the fifth frequency division end, the other end of the eighth matching device 48 and one end of the ninth matching device 49 are both connected to the sixth frequency division end corresponding to the fifth frequency division end, and the other end of the ninth matching device 49 and the other end of the tenth matching device 410 are both grounded. In this embodiment, three matching devices are arranged between the same frequency division ends of the fifth frequency divider 25 and the sixth frequency divider 26, wherein the eighth matching device 48 is connected in series between the two frequency division ends, and the ninth matching device 49 and the tenth matching device 410 are connected in parallel with the two ends of the eighth matching device 48, respectively. In this embodiment, the front-end frequency divider and the back-end frequency divider are used to divide the signal into three paths, each transmitting a high frequency, an intermediate frequency and a low frequency signal, and between the two frequency dividers, there are series and parallel matching devices, and this group of series and parallel matching is only used for high frequency, intermediate frequency or low frequency, and has no effect on other frequency bands. The series-parallel circuit form between the two frequency dividers can be varied in many ways, and there can be multiple series-parallel devices.

[0046] As an embodiment, the seventh matching device 47, the eighth matching device 48, the ninth matching device 49 and the tenth matching device 410 are any one of a capacitor, an inductor and a resistor. In this embodiment, capacitors, resistors or inductors are provided as matching devices to adjust the antenna impedance to match the impedance of the feeder 30 and the impedance of the RF chip, thereby reducing RF signal reflection and improving radiation performance.

[0047] The embodiment of the present application also provides a mobile terminal, which includes the above-mentioned RF front-end circuit. Among them, the matching network in the RF front-end circuit is used on the feeder to match the impedance between the RF chip or microstrip line and the antenna, reduce the reflection of the feeder signal, increase the part of the signal radiated through the antenna radiator, and thus improve the radiation performance of the antenna system in the mobile terminal. That is, the matching of each frequency band in the present application together with the antenna radiator constitutes a specific impedance, and this impedance can better adapt to the impedance of the RF module composed of RF devices and microstrip lines at the PCB board end of the mobile terminal, so as to reduce the reflection of the signal at the antenna system and increase the radiation.

[0048] In addition, the RF front-end circuit in this embodiment uses only one antenna radiator. Without adding antenna radiators, matching of different frequency bands can be achieved, so that they do not affect each other, simplify debugging, and improve work efficiency. This is more suitable for the relatively compact stacking design inside the mobile terminal. In addition, without adding antenna radiators, antenna shrapnel required for PCB connection to antenna radiators, etc., the space occupied by PCB and housing is reduced. Since the RF front-end circuit is described in detail above, it will not be repeated here.

[0049] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0050] The RF front-end circuit provided in the embodiments of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A radio frequency front-end circuit, characterized in that: include: An antenna radiator, wherein the antenna radiator is connected to the feeder; The first frequency divider has a first common terminal and a plurality of first frequency dividing terminals, the first common terminal is connected to the feeder, and each of the first frequency dividing terminals is correspondingly grounded via a first matching device.

2. The radio frequency front-end circuit according to claim 1, characterized in that: The radio frequency front end circuit also includes: A second frequency divider, wherein the second frequency divider has a second common terminal and a plurality of second frequency division terminals, and the second common terminal is connected to the antenna radiator; A third frequency divider, the third frequency divider having a third common terminal and a plurality of third frequency dividing terminals, the third common terminal being connected to the radio frequency chip through the feeder; A plurality of first matching circuits, the number of the first matching circuits is the same as the number of the second frequency division ends, and each of the second frequency division ends is connected to the corresponding third frequency division end through a first matching circuit.

3. The RF front-end circuit according to claim 2, characterized in that: The first matching circuit includes a second matching device, one end of the second matching device is connected to the second frequency division end, and the other end of the second matching device is connected to the third frequency division end corresponding to the second frequency division end.

4. The radio frequency front-end circuit according to claim 2, characterized in that: The first matching circuit includes a third matching device, a fourth matching device and a fifth matching device, one end of the third matching device and one end of the fourth matching device are both connected to the second frequency division end, the other end of the third matching device and one end of the fifth matching device are both connected to the third frequency division end corresponding to the second frequency division end, and the other end of the fourth matching device and the other end of the fifth matching device are both grounded.

5. The radio frequency front-end circuit according to claim 3 or 4, characterized in that: The RF front-end circuit also includes a fourth frequency divider, which has a fourth common terminal and multiple fourth frequency divider terminals. The fourth common terminal and the third common terminal are both connected to the RF chip through the feeder line, and each of the fourth frequency divider terminals is correspondingly grounded through a sixth matching device.

6. The radio frequency front-end circuit according to claim 5, characterized in that: The first matching element or the sixth matching element is any one of a capacitor, an inductor and a resistor.

7. A radio frequency front-end circuit, characterized in that: The radio frequency front end circuit comprises: Antenna radiator; a fifth frequency divider, the fifth frequency divider having a fifth common terminal and a plurality of fifth frequency dividing terminals, the fifth common terminal being connected to the antenna radiator; A sixth frequency divider, the sixth frequency divider having a sixth common terminal and a plurality of sixth frequency dividing terminals, the sixth common terminal being connected to the radio frequency chip via a feeder; A plurality of second matching circuits, the number of the second matching circuits is the same as the number of the fifth frequency division ends, and each of the fifth frequency division ends is connected to the corresponding sixth frequency division end through a second matching circuit.

8. The radio frequency front-end circuit according to claim 7, characterized in that: The second matching circuit includes a seventh matching device, one end of the seventh matching device is connected to the fifth frequency division end, and the other end of the seventh matching device is connected to the sixth frequency division end corresponding to the fifth frequency division end.

9. The radio frequency front-end circuit according to claim 7, characterized in that: The second matching circuit includes an eighth matching device, a ninth matching device and a tenth matching device, one end of the eighth matching device and one end of the ninth matching device are both connected to the fifth frequency division end, the other end of the eighth matching device and one end of the ninth matching device are both connected to the sixth frequency division end corresponding to the fifth frequency division end, and the other end of the ninth matching device and the other end of the tenth matching device are both grounded.

10. A mobile terminal, characterized in that: The mobile terminal comprises the radio frequency front-end circuit as described in any one of claims 1-9.

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