Radio frequency circuit and terminal equipment

Abstract

The invention discloses a radio frequency circuit and terminal equipment, the terminal equipment comprises a first antenna, and the radio frequency circuit comprises a first radio frequency chip, a first change-over switch and a radio frequency identification chip; the first antenna is connected with the first change-over switch, and the first change-over switch is further connected with the radio frequency identification chip and the first radio frequency chip. The first change-over switch is used for switching the first antenna to be connected with the radio frequency identification chip in a first state and switching the first antenna to be connected with the first radio frequency chip in a second state; the first antenna is used as a radio frequency identification antenna in a first state, and the first antenna is used as a radio frequency transmit-receive antenna in a second state. The problem that an existing RFID handheld terminal is large in size can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a radio frequency circuit and a terminal device. Background Art

[0002] With the development of terminal devices and the popularization of 5G devices, RFID (Radio Frequency Identification) handheld terminal devices similar in form to 5G mobile phones are being used more and more in the market. At present, for 5G RFID handheld terminal devices, an external independent RFID antenna is required, which increases the overall volume of the terminal device.

[0003] Therefore, the current technology needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a radio frequency circuit and a terminal device, which can effectively alleviate the problem of the large volume of current RFID handheld terminals.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An embodiment of the present application provides a radio frequency circuit, which is applied to a terminal device. The terminal device includes a first antenna, and the radio frequency circuit includes a first radio frequency chip, a switching switch, and a radio frequency identification chip; the first antenna is connected to the first switching switch, and the first switching switch is also respectively connected to the radio frequency identification chip and the first radio frequency chip;

[0007] The first switching switch is used to switch the first antenna to be connected to the radio frequency identification chip in the first state, and switch the first antenna to be connected to the first radio frequency chip in the second state; the first antenna is used as a radio frequency identification antenna in the first state and as a radio frequency transceiver antenna in the second state.

[0008] In some embodiments of the radio frequency circuit, the radio frequency circuit further includes a second radio frequency chip and a first duplexer; the first end of the first duplexer is connected to the first antenna, the second end of the first duplexer is connected to the second radio frequency chip, and the third end of the first duplexer is connected to the first switching switch.

[0009] In some embodiments of the radio frequency circuit, the terminal device further includes a second antenna, and the radio frequency circuit further includes a second switching switch, a third switching switch, and a third radio frequency chip. The second switching switch is connected to the first radio frequency chip, the second switching switch is also connected to the first switching switch, the second switching switch is also connected to the third switching switch, and the third switching switch is also connected to the third radio frequency chip and the second antenna;

[0010] The second switching switch is used to switch the first radio frequency chip to be connected to the third switching switch in the first state, and the third switching switch then switches the second antenna to be connected to the second switching switch;

[0011] The second switching switch is used to switch the first radio frequency chip to be connected to the first switching switch in the second state, and the first switching switch then switches the first antenna to be connected to the second switching switch.

[0012] In the radio frequency circuit of some embodiments, the radio frequency circuit further includes a second duplexer and a fourth radio frequency chip. The first end of the second duplexer is connected to the second antenna, the second end of the second duplexer is connected to the third switching switch, and the third end of the second duplexer is connected to the fourth radio frequency chip.

[0013] In the radio frequency circuit of some embodiments, the radio frequency circuit further includes a tuning circuit. The tuning circuit is connected to the first antenna and is used to adjust the impedance matching between the first antenna and the radio frequency identification chip or the first radio frequency chip or the second radio frequency chip.

[0014] In the radio frequency circuit of some embodiments, the frequency band of the radio frequency signal radiated by the first antenna in the first state is 902 MHz to 927 MHz; the frequency band of the radio frequency signal radiated by the first antenna in the second state is 617 MHz to 960 MHz and 2.3 GHz to 2.7 GHz.

[0015] In the radio frequency circuit of some embodiments, the tuning circuit includes an antenna switch and a plurality of impedance matching branches connected to the antenna switch. The antenna switch is connected to the first antenna and is used to connect the first antenna to one impedance matching branch or a plurality of impedance matching branches.

[0016] The embodiment of the present application further provides a terminal device, and the terminal device includes:

[0017] A metal frame, the metal frame includes a plurality of frame segments, wherein at least one frame segment serves as the first antenna, at least one frame segment serves as the first antenna, and the first antenna is not adjacent to the second antenna;

[0018] The above-mentioned radio frequency circuit, the radio frequency circuit is electrically connected to the first antenna and the second antenna.

[0019] In the terminal device of some embodiments, an antenna feed point and a tuning pin are arranged in the first antenna. The antenna feed point is electrically connected to the radio frequency circuit, and the tuning pin is connected to the tuning circuit.

[0020] Compared with the prior art, the present application provides a radio frequency circuit and a terminal device. In the radio frequency circuit, a switching switch is set to switch the first antenna to the corresponding radio frequency chip in different states, so as to realize the multiplexing of the first antenna. Then, it is not necessary to set an external independent RFID antenna in the terminal device, so as to facilitate reducing the volume of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 6 is a first structural block diagram of the radio frequency circuit provided by the present application.

[0022] Figure 2 FIG. 10 is a second structural block diagram of the radio frequency circuit provided by the present application.

[0023] Figure 3 FIG. 14 is a third structural block diagram of the radio frequency circuit provided by the present application.

[0024] Figure 4 FIG. 18 is a fourth structural block diagram of the radio frequency circuit provided by the present application.

[0025] Figure 5 FIG. 22 is a fifth structural block diagram of the radio frequency circuit provided by the present application.

[0026] Figure 6 FIG. 26 is a sixth structural block diagram of the radio frequency circuit provided by the present application.

[0027] Figure 7 FIG. 30 is a circuit diagram of the antenna matching circuit, the first radio frequency matching circuit, the second radio frequency matching circuit, and the third radio frequency matching circuit of the radio frequency circuit provided by the present application.

[0028] Figure 8 FIG. 34 is a circuit diagram of the tuning circuit of the radio frequency circuit provided by the present application.

[0029] Figure 9 FIG. 38 is a schematic structural diagram of the metal frame in the terminal device provided by the present application.

[0030] Figure 10 provided by the present application Figure 9 partial schematic diagram in

[0031] Figure 11 FIG. 48 is a resonance diagram of the radio frequency identification antenna in the terminal device provided by the present application.

[0032] Figure 12 FIG. 52 is a radiation efficiency diagram of the radio frequency identification antenna in the terminal device provided by the present application.

[0033] Figure 13 FIG. 56 is an antenna efficiency diagram corresponding to Etheta at all angles in the terminal device provided by the present application.

[0034] Figure 14The antenna efficiency diagram corresponding to Ephi in the terminal device provided by this application at all angles.

[0035] Figure 15 The antenna efficiency diagram after the synthesis of Etheta and Ephi in the terminal device provided by this application. Detailed implementation manners

[0036] To make the objectives, technical solutions and effects of the present invention clearer and more definite, the present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Please refer to Figure 1 , a radio frequency circuit is provided in this application. The radio frequency circuit is applied to a terminal device, and the terminal device can be an RFID handheld terminal device. The terminal device includes a first antenna 11, and the first antenna 11 is a low-frequency antenna in the 5G antennas of the terminal device.

[0038] The radio frequency circuit in the embodiment of this application includes a first radio frequency chip 21, a switching switch, and a radio frequency identification chip 23, i.e., an RFID chip; the first antenna 11 is connected to the first switching switch 22, and the first switching switch 22 is also respectively connected to the radio frequency identification chip 23 and the first radio frequency chip 21. Among them, the first switching switch 22 is used to switch the first antenna 11 to be connected to the radio frequency identification chip 23 in the first state, and switch the first antenna 11 to be connected to the second radio frequency chip 24 in the second state. The first antenna 11 is used as a radio frequency identification antenna in the first state, and the first antenna 11 is used as a radio frequency transceiver antenna in the second state.

[0039] The first state is that the terminal device works in the radio frequency identification state. At this time, the first switching switch 22 switches the first antenna 11 to be connected to the radio frequency identification chip 23, and the first antenna 11 is used as a radio frequency identification antenna. The second state is that the terminal device works in the 5G communication state. At this time, the first switching switch 22 switches the first antenna 11 to the first radio frequency chip 21, and the first antenna 11 serves as a low-frequency antenna in the terminal device, which is used for the transmission of low-frequency signals and the reception of high-frequency signals. Thus, by setting the switching switch to switch the first antenna 11 to the corresponding radio frequency chip in different states, the multiplexing of the first antenna 11 is realized, so that it is not necessary to set an external independent RFID antenna in the terminal device, so as to facilitate reducing the volume of the terminal device.

[0040] Please refer to Figure 2, in some embodiments, the radio frequency circuit further includes a second radio frequency chip 24 and a first duplexer 25; a first end of the first duplexer 25 is connected to the first antenna 11, a second end of the first duplexer 25 is connected to the second radio frequency chip 24, and a third end of the first duplexer 25 is connected to the first switch 22. The first radio frequency chip 21 in this embodiment is a low-frequency radio frequency chip, and the second radio frequency chip 24 is a high-frequency radio frequency signal, so as to meet the low-frequency signal transmission function and high-frequency signal reception function of the first antenna 11.

[0041] The frequency bands of the low-frequency signals transmitted by the first antenna 11 are such as B71, B12, B13, B5, and B8, etc., and the covered frequency band is 617 MHz to 960 MHz; the high-frequency signals received by the first antenna 11 cover a frequency band of 2.3 GHz to 2.7 GHz; and the first antenna 11 serves as a radio frequency identification antenna, and the corresponding covered radio frequency signal frequency range is 902 MHz to 927 MHz.

[0042] Please refer to Figure 3 , in some embodiments, the terminal device further includes a second antenna, and the radio frequency circuit further includes a second switch 26, a third switch 27, and a third radio frequency chip 28. The second switch 26 is connected to the first radio frequency chip 21, the second switch 26 is further connected to the first switch 22, the second switch 26 is further connected to the third switch 27, and the third switch 27 is further connected to the third radio frequency chip 28 and the second antenna. Among them, the second switch 26 is used to switch the first radio frequency chip 21 to be connected to the third switch 27 in the first state, and the third switch 27 switches the second antenna to be connected to the second switch 26; the second switch 26 is used to switch the first radio frequency chip 21 to be connected to the first switch 22 in the second state, and the first switch 22 switches the first antenna 11 to be connected to the second switch 26.

[0043] In the first state, the first switch 22 connects the first antenna 11 to the radio frequency identification chip 23, and the first antenna 11 serves as a radio frequency identification antenna. At this time, the second switch 26 switches the first radio frequency chip 21 to be connected to the third switch 27, so that the second antenna is connected to the first radio frequency chip 21 through the third switch 27 and the second switch 26. At this time, the second antenna serves as a low-frequency transmitting antenna, and the frequency bands of the low-frequency signals transmitted by the second antenna are such as B71, B12, B13, B5, and B8, etc.

[0044] The third RF chip 28 is a low-frequency diversity receiving chip. In the second state, the first switch 22 switches the first antenna 11 to be connected to the second switch 26, and the second switch 26 connects the first RF chip 21 to the first switch 22. At this time, the first antenna 11 serves as a low-frequency transmitting antenna and a high-frequency receiving antenna. At this time, the third switch 27 switches the second antenna to be connected to the third RF chip 28, and at this time, the second antenna serves as a low-frequency diversity receiving antenna.

[0045] Please refer to Figure 4 , in some embodiments, the RF circuit further includes a second duplexer 30 and a fourth RF chip 29. The first end of the second duplexer 30 is connected to the second antenna, the second end of the second duplexer 30 is connected to the third switch 27, and the third end of the second duplexer 30 is connected to the fourth RF chip 29.

[0046] The fourth RF chip 29 is a high-frequency diversity receiving chip, that is, the second antenna in this embodiment can serve as a high-frequency diversity receiving antenna.

[0047] Please refer to Figure 5 , in some embodiments, the first antenna 11 is correspondingly provided with an antenna matching circuit 31, thereby ensuring that the input impedance of the first antenna 11 matches the characteristic impedance of the RF circuit, so as to maximize the transmission of signal power. In the RF circuit, a first RF matching circuit 32 is provided between the antenna matching circuit 31 and the first duplexer 25; and a second RF matching circuit 33 is provided between the first switch 22 and the RFID chip 23, and a third RF matching circuit 34 is provided between the second antenna and the second duplexer 30. In this embodiment, by setting the RF matching circuit, on the one hand, the impedance can be matched, and on the other hand, an appropriate load can be provided for the RF circuit, improving the safety and stability of the circuit.

[0048] Please refer to Figure 6 , in some embodiments, the RF circuit further includes a tuning circuit 35, and the tuning circuit 35 is connected to the first antenna 11; the tuning circuit 35 is used to adjust the impedance matching between the first antenna 11 and the RFID chip 23 or the first RF chip 21 or the second RF chip 24.

[0049] Please refer to Figure 7, as an embodiment, the antenna matching circuit 31 may include a first capacitor C1, a first inductor L1, and a second capacitor C2. The first capacitor C1 is connected in series between the first antenna 11 and the first radio frequency matching circuit 32. The first inductor L1 is connected in parallel between the first capacitor C1 and the first antenna 11. The second capacitor C2 is connected in parallel between the first capacitor C1 and the first radio frequency matching circuit 32. The first radio frequency matching antenna includes a second inductor L2, and the second inductor L2 is connected in series between the first duplexer 25 and the first capacitor C1. The second radio frequency matching circuit 33 includes a third inductor L3, and the second inductor L2 is connected in series between the first switching switch 22 and the radio frequency identification chip 23. The third radio frequency matching circuit 34 includes a fourth inductor L4, and the fourth inductor L4 is connected in series between the second antenna and the second duplexer 30.

[0050] As an embodiment, the first switching switch 22, the second switching switch 26, and the third switching switch 27 are all single-pole double-throw switches.

[0051] When in the first state, the first antenna 11 is directly connected to the first switching switch 22 through the antenna matching circuit 31, via the first radio frequency matching circuit 32 and the first duplexer 25, and is switched through the first switching switch 22 to be connected to the radio frequency identification chip 23. At this time, the first antenna 11 operates as a radio frequency identification antenna. The transmission path of the second antenna is: the transmission signal of the first radio frequency chip 21 passes through the second switching switch 26 to the third switching switch 27, through the second duplexer 30 and the third radio frequency matching circuit 34 to the second antenna. Correspondingly, the second antenna, as a receiving antenna, transmits the received high-frequency signal through the second radio frequency matching circuit 33 and through the second duplexer 30 to the fourth radio frequency chip 29. At this time, the first antenna 11 operates as a radio frequency identification antenna, and the second antenna operates as a transceiver antenna.

[0052] When in the second state, the first antenna 11 is directly connected to the first single-pole double-throw switch through the antenna matching via the first radio frequency matching circuit 32 and the first duplexer 25, and then is connected to the first radio frequency chip 21 through the second switching switch 26 via the single-pole double-throw switch. At this time, the third switching switch 27 is switched to be connected to the third radio frequency chip 28, and is connected to the second antenna through the second duplexer 30 and the third radio frequency matching circuit 34. At this time, the first antenna 11 operates as a conventional transceiver low-frequency antenna, and the second antenna operates as a low-frequency diversity receiving antenna.

[0053] Please refer to Figure 8 , as an embodiment, the tuning circuit includes an antenna switch 341 and a plurality of impedance matching branches connected to the antenna switch 341. The antenna switch 341 is connected to the first antenna 11 and is used to connect the first antenna 11 to one impedance matching branch or a plurality of impedance matching branches to optimize the impedance matching of signal transmission.

[0054] Each impedance matching branch includes a fifth inductor L5, and one fifth inductor L5 is provided in each of the four impedance matching branches. The four fifth inductors L5 are respectively L41, L42, L43, and L44, and each fifth inductor L5 is connected to the four ports of the antenna switch 341, namely RF1, RF2, RF3, and RF4. The inductance values of the four fifth inductors L5 are 5.6 nh, 56 nh, 18 nh, and 12 nh respectively. Among them, a sixth inductor L6 is connected to the common terminal of the antenna switch 341, and the inductance value of the sixth inductor L6 is 56 nh. When the first antenna 11 is in the B71 frequency band, the antenna switch 341 does not work at this time, and only the sixth inductor L6 at the common terminal participates in the work. When the first antenna 11 operates in the B12 frequency band, the switch can be switched to connect to the inductor L52 at this time, and the inductor L52 participates in the work; when the first antenna 11 operates in the B13 frequency band, the switch can be switched to the inductor L53 at this time, and the inductor L53 participates in the work; when the first antenna 11 operates in the B5 frequency band, the antenna switch 341 can be switched to connect to the inductor L54 at this time, and the inductor L54 participates in the work; when the first antenna 11 operates in the B8 frequency band, the antenna switch 341 can be simultaneously connected to the inductors L52, L53, and L54 at this time, and the inductors L52, L53, and L54 all participate in the work.

[0055] Please refer to Figure 9 , the embodiment of the present application further provides a terminal device, which includes a metal frame and the above-mentioned radio frequency circuit. The metal frame includes a plurality of frame segments, wherein at least one frame segment serves as the first antenna 11, at least one frame segment serves as the first antenna 11, and the first antenna 11 is not adjacent to the second antenna; the radio frequency circuit is electrically connected to the first antenna 11 and the second antenna.

[0056] Based on the schematic diagram of the back of the terminal device, the border end corresponding to the first antenna 11 is located at the upper right of the metal border, and the border segment corresponding to the second antenna is located at the lower left of the metal border. A third antenna 13 is formed at the lower right of the metal border, a fourth antenna 14 is formed on the upper part of the right side of the metal border, a fifth antenna 15 is formed on the lower part of the right side of the metal border, a sixth antenna 16 is formed on the upper side of the metal border, a seventh antenna 17 is formed at the upper left corner of the metal border, and an eighth antenna 18 and a ninth antenna 19 are formed on the left side of the metal border. Among them, the third antenna 13 is a medium-frequency receiving and ultra-high-frequency receiving antenna, covering frequency bands of 1.8 GHz to 2.2 GHz and 3.3 GHz to 4.5 GHz; the fourth antenna 14 is a medium-frequency transmitting and ultra-high-frequency receiving antenna, covering frequency bands of 1710 MHz to 2200 MHz and 3.3 GHz to 4.5 GHz; the fifth antenna 15 is a high-frequency receiving and ultra-high-frequency receiving antenna, covering frequency bands of 2.3 GHz to 2.7 GHz and 3.3 GHz to 4.5 GHz; the sixth antenna 16 is a WIFI 5G and 6E antenna; the seventh antenna 17 is a GPS and WIFI 2.4 GHz antenna; the eighth antenna 18 is a medium-frequency receiving antenna and an ultra-high-frequency transmitting antenna, covering frequency bands of 1.8 GHz to 2.2 GHz and 3.3 GHz to 4.5 GHz; the ninth antenna 19 is a high-frequency transmitting and ultra-high-frequency receiving antenna, covering frequency bands of 2.3 GHz to 2.7 GHz and 3.3 GHz to 4.5 GHz.

[0057] Please refer to Figure 10 , as an embodiment, the metal border segment forming the first antenna 11 is provided with an antenna feed point A and a tuning pin B. This metal border segment is connected to the radio frequency circuit through the feed point A and connected to the tuning circuit 35 through the tuning pin B. The distance w1 from the tuning pin to the notch on one side can be 17 mm, and the length w2 between the feed point and the tuning pin can be 7.5 mm; the notches on both sides of the metal border segment corresponding to the first antenna 11 are N1 and N2 respectively, and the widths of the two notches can be 1.5 mm.

[0058] When the first antenna 11 is used as a radio frequency identification antenna, it can be tuned according to the frequency points required by the radio frequency identification antenna. When the first antenna 11 works as a radio frequency identification antenna, the resonance diagram of the corresponding radio frequency identification antenna is as Figure 11 shown, and the schematic diagram of the radiation efficiency of the corresponding antenna radio frequency identification antenna is as Figure 12 shown. It can be seen from the figure that both the bandwidth and efficiency of the radio frequency identification antenna meet the requirements.

[0059] Among them, Figure 13 is the antenna efficiency diagram corresponding to Etheta (the θ component of the electric field) at all angles; Figure 14 is the antenna efficiency diagram corresponding to Ephi (the φ component of the electric field) at all angles;Figure 15 It is the antenna efficiency diagram after the synthesis of Etheta and Ephi. According to the figure, the performances of Etheta and Ephi are quite equivalent, being 0.4247 and 0.2798 dB respectively, that is, the corresponding horizontal polarization and vertical polarization performances are quite equivalent. This indicates that when the first antenna multiplexing of the terminal device is used as the RFID antenna, whether the terminal device is placed horizontally or vertically, good RFID functions can be achieved.

[0060] In this embodiment, the radio frequency circuit of the terminal device multiplexes the first antenna 11 in the terminal device by setting a switching switch and a radio frequency identification chip 23, so that the first antenna 11 can be used as a conventional radio frequency transceiver antenna in the terminal device or as a radio frequency identification antenna. Then, there is no need to set an external independent RFID antenna in the terminal device, so as to facilitate reducing the volume of the terminal device.

[0061] The radio frequency circuit provided by the embodiments of the present application has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A radio frequency circuit, characterized in that: The radio frequency circuit is applied to a terminal device, the terminal device includes a first antenna, and the radio frequency circuit includes a first radio frequency chip, a first switch and a radio frequency identification chip; the first antenna is connected to the first switch, and the first switch is also connected to the radio frequency identification chip and the first radio frequency chip respectively; The first switching switch is used to switch the first antenna to be connected to the radio frequency identification chip in a first state, and to switch the first antenna to be connected to the first radio frequency chip in a second state; the first antenna is used as a radio frequency identification antenna in the first state, and the first antenna is used as a radio frequency transceiver antenna in the second state.

2. The radio frequency circuit according to claim 1, characterized in that: The RF circuit also includes a second RF chip and a first duplexer; the first end of the first duplexer is connected to the first antenna, the second end of the first duplexer is connected to the second RF chip, and the third end of the first duplexer is connected to the first switching switch.

3. The radio frequency circuit according to claim 2, characterized in that: The terminal device further includes a second antenna, the radio frequency circuit further includes a second switch, a third switch and a third radio frequency chip, the second switch is connected to the first radio frequency chip, the second switch is also connected to the first switch, the second switch is also connected to the third switch, and the third switch is also connected to the third radio frequency chip and the second antenna; The second switch is used to switch the first RF chip to be connected to the third switch in the first state, and the third switch switches the second antenna to be connected to the second switch; The second switch is used to switch the first RF chip to be connected to the first switch in the second state, and the first switch switches the first antenna to be connected to the second switch.

4. The radio frequency circuit according to claim 3, characterized in that: The RF circuit also includes a second duplexer and a fourth RF chip, the first end of the second duplexer is connected to the second antenna, the second end of the second duplexer is connected to the third switch, and the third end of the second duplexer is connected to the fourth RF chip.

5. The radio frequency circuit according to any one of claims 1 to 4, characterized in that: The radio frequency circuit further includes a tuning circuit, which is connected to the first antenna and is used to adjust the impedance matching between the first antenna and the radio frequency identification chip or the first radio frequency chip or the second radio frequency chip.

6. The radio frequency circuit according to claim 4, characterized in that: The frequency band of the radio frequency signal radiated by the first antenna in the first state is 902 MHz to 927 MHz; the frequency band of the radio frequency signal radiated by the first antenna in the second state is 617 MHz to 960 MHz and 2.3 GHz to 2.7 GHz.

7. The radio frequency circuit according to claim 5, characterized in that: The tuning circuit includes an antenna switch and a plurality of impedance matching branches connected to the antenna switch. The antenna switch is connected to the first antenna and is used to connect the first antenna to one or more impedance matching branches.

8. The radio frequency circuit according to claim 5, characterized in that: The first switch, the second switch and the third switch are all single-pole double-throw switches.

9. A terminal device, characterized in that: The terminal device comprises: A metal frame, the metal frame comprising a plurality of frame segments, wherein at least one frame segment serves as a first antenna, and at least one frame segment serves as a first antenna, and the first antenna is not adjacent to the second antenna; The radio frequency circuit as described in any one of claims 3 to 8, wherein the radio frequency circuit is electrically connected to the first antenna and the second antenna.

10. The terminal device according to claim 9, characterized in that: An antenna feed point and a tuning pin are provided in the first antenna. The antenna feed point is electrically connected to the radio frequency circuit, and the tuning pin is connected to the tuning circuit.

Images