CN108321542B - Antenna system and communication terminal applying same - Google Patents
Antenna system and communication terminal applying same Download PDFInfo
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- CN108321542B CN108321542B CN201810002362.2A CN201810002362A CN108321542B CN 108321542 B CN108321542 B CN 108321542B CN 201810002362 A CN201810002362 A CN 201810002362A CN 108321542 B CN108321542 B CN 108321542B
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Abstract
An antenna system comprises a radiator, a first feed-in end and a first matching circuit, wherein the first feed-in end is electrically connected with the radiator through the first matching circuit, the first feed-in end is used for receiving a first feed-in signal, the antenna system works in a near field communication mode under the action of the first feed-in signal, and the first matching circuit is used for offsetting the original inductive reactance of the antenna system and increasing the resistance of the antenna system when the antenna system works in the near field communication mode. The antenna system can realize the sharing of a far-field communication antenna and a near-field communication antenna. The invention also provides a communication terminal.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to an antenna system and a communication terminal using the same.
Background
Near Field Communication (NFC) technology is a short-distance wireless Communication technology, allows non-contact point-to-point data transmission and exchange between electronic devices, and can be applied to the fields of mobile payment, electronic ticketing, access control and attendance checking, and the like. At present, NFC has gradually become an essential function of communication terminals such as mobile phones and tablet computers. The NFC function can be realized without departing from the antenna design, the space required by the existing NFC antenna is large, and in order to avoid interference, ferrite which has the same area as the NFC antenna and is expensive needs to be provided, which undoubtedly increases the production cost of communication terminals such as mobile phones and tablet computers. Meanwhile, with the popularization of the fourth generation mobile communication technology, the diversified development of the functions and the light and thin development of the external dimensions of the communication terminals such as mobile phones and tablet computers, the design demand of the mobile communication field for the antenna system with small volume and wide bandwidth of the communication terminal is more and more urgent, and how to design the antenna system with excellent radiation characteristics, including the far field communication antenna and the NFC antenna, in the limited space becomes a technical problem which needs to be solved at present in the wireless communication field.
Disclosure of Invention
The invention provides an antenna system, which realizes the sharing of a far-field communication antenna and an NFC antenna by adding a matching circuit on the existing far-field communication antenna system, thereby not needing to design a separate NFC antenna, effectively controlling the whole size and complexity of the antenna system and reducing the production cost.
In addition, the invention also provides a communication terminal applying the antenna system.
An antenna system is used for transmitting and receiving wireless communication signals, and comprises a radiator, a first feed-in end and a first matching circuit, wherein the first feed-in end is electrically connected with the radiator through the first matching circuit, the first feed-in end is used for receiving a first feed-in signal, the antenna system works in a near field communication mode under the action of the first feed-in signal, and the first matching circuit is used for offsetting the original inductive reactance of the antenna system and increasing the resistance of the antenna system when the antenna system works in the near field communication mode.
The antenna system further comprises a second feed-in terminal and a second matching circuit, the second feed-in terminal and the first feed-in terminal are arranged at intervals, the second feed-in terminal is used for receiving a second feed-in signal, and the antenna system works in a far-field communication mode under the action of the second feed-in signal.
The first matching circuit is further used for realizing the isolation of the second feed-in signal from the first feed-in signal and the reference ground of the first feed-in signal when the antenna system works in a far-field communication mode.
Wherein the second matching circuit is configured to implement impedance matching of the antenna system when the antenna system is operating in a far-field communication mode.
The antenna system further comprises a ground terminal and a third matching circuit, wherein the ground terminal is arranged at intervals with the first feed-in end and the second feed-in end, and the ground terminal is electrically connected with the radiator through the third matching circuit.
Wherein the third matching circuit is configured to resonate the antenna system at an operating frequency of near field communication when the antenna system is operating in a near field communication mode.
The first matching circuit comprises a first inductor, a first capacitor and a first reference ground, one end of the first inductor is electrically connected with the radiator, the other end of the first inductor is electrically connected with one end of the first capacitor and the first feed-in end, and the other end of the first capacitor is connected with the first reference ground.
The first matching circuit comprises a second inductor, a third inductor, a second capacitor and a second reference ground, wherein one end of the second inductor is electrically connected with the radiator, the other end of the second inductor is electrically connected with one end of the third inductor and one end of the second capacitor, the other end of the third inductor is electrically connected with the first feed end, and the other end of the second capacitor is electrically connected with the second reference ground.
The first matching circuit comprises a third capacitor, a fourth inductor, a fifth inductor and a third reference ground, one end of the third capacitor is electrically connected with the radiator, the other end of the third capacitor is electrically connected with one end of the fourth inductor and one end of the fifth inductor, the other end of the fourth inductor is electrically connected with the first feed end, and the other end of the fifth inductor is electrically connected with the third reference ground.
The first matching circuit comprises a fourth capacitor, a sixth inductor and a fourth reference ground, the sixth inductor comprises a first connecting end, a second connecting end and a third connecting end, one end of the fourth capacitor is electrically connected with the radiator, the other end of the fourth capacitor is electrically connected with the first connecting end, the second connecting end is electrically connected with the first feed-in end, and the third connecting end is electrically connected with the fourth reference ground.
The third matching circuit comprises a seventh inductor and a fifth capacitor, one end of the seventh inductor is electrically connected with the radiator, the other end of the seventh inductor is electrically connected with one end of the fifth capacitor, and the other end of the fifth capacitor is electrically connected with the grounding end.
A communication terminal comprises a substrate, wherein a first signal source is arranged on the substrate, the communication terminal further comprises an antenna system, the antenna system comprises a radiating body, a first feed-in end and a first matching circuit, the first feed-in end is electrically connected with the radiating body through the first matching circuit, the first signal source is electrically connected with the first feed-in end and used for providing a first feed-in signal for the antenna system, the antenna system works in a near field communication mode under the action of the first feed-in signal, and the first matching circuit is used for offsetting the original inductive reactance of the antenna system when the antenna system works in the near field communication mode and increasing the resistance of the antenna system.
The substrate is also provided with a second signal source; the antenna system further comprises a second feed-in end and a second matching circuit, the second feed-in end and the first feed-in end are arranged at intervals, the second signal source is electrically connected with the second feed-in end and used for providing a second feed-in signal for the antenna system, and the antenna system works in a far-field communication mode under the action of the second feed-in signal.
The first matching circuit is further used for realizing the isolation of the second feed-in signal from the first feed-in signal and the reference ground of the first feed-in signal when the antenna system works in a far-field communication mode.
Wherein the second matching circuit is configured to implement impedance matching of the antenna system when the antenna system is operating in a far-field communication mode.
The substrate is also provided with a system ground plane; the antenna system further comprises a grounding terminal and a third matching circuit, the grounding terminal is arranged at intervals with the first feed-in terminal and the second feed-in terminal, the system grounding surface is electrically connected with the grounding terminal and used for providing grounding for the antenna system, and the grounding terminal is electrically connected with the radiator through the third matching circuit.
Wherein the third matching circuit is configured to resonate the antenna system at an operating frequency of near field communication when the antenna system is operating in a near field communication mode. The first matching circuit comprises a first inductor, a first capacitor and a first reference ground, one end of the first inductor is electrically connected with the radiator, the other end of the first inductor is electrically connected with one end of the first capacitor and the first feed-in end, and the other end of the first capacitor is connected with the first reference ground.
The first matching circuit comprises a second inductor, a third inductor, a second capacitor and a second reference ground, wherein one end of the second inductor is electrically connected with the radiator, the other end of the second inductor is electrically connected with one end of the third inductor and one end of the second capacitor, the other end of the third inductor is electrically connected with the first feed end, and the other end of the second capacitor is electrically connected with the second reference ground.
The first matching circuit comprises a third capacitor, a fourth inductor, a fifth inductor and a third reference ground, one end of the third capacitor is electrically connected with the radiator, the other end of the third capacitor is electrically connected with one end of the fourth inductor and one end of the fifth inductor, the other end of the fourth inductor is electrically connected with the first feed end, and the other end of the fifth inductor is electrically connected with the third reference ground.
The first matching circuit comprises a fourth capacitor, a sixth inductor and a fourth reference ground, the sixth inductor comprises a first connecting end, a second connecting end and a third connecting end, one end of the fourth capacitor is electrically connected with the radiator, the other end of the fourth capacitor is electrically connected with the first connecting end, the second connecting end is electrically connected with the first feed-in end, and the third connecting end is electrically connected with the fourth reference ground.
The third matching circuit comprises a seventh inductor and a fifth capacitor, one end of the seventh inductor is electrically connected with the radiator, the other end of the seventh inductor is electrically connected with one end of the fifth capacitor, and the other end of the fifth capacitor is electrically connected with the grounding end.
According to the antenna system, the first matching circuit is added on the existing far-field communication antenna system, and the first feed-in end is used for receiving the first feed-in signal, so that the antenna system works in a near-field communication mode under the action of the first feed-in signal, a separate NFC antenna is not required to be designed, the overall size and complexity of the antenna system and the communication terminal can be effectively controlled, and the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an antenna system according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a first matching circuit of the antenna system shown in fig. 1.
Fig. 3A-3C are schematic diagrams of alternative configurations of the first matching circuit of the antenna system of fig. 1.
Fig. 4 is a schematic diagram of a third matching circuit of the antenna system shown in fig. 1.
Fig. 5 is a schematic configuration diagram of a communication terminal according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention provides an antenna system 100, which is applied in a communication terminal such as a mobile phone, a tablet computer, etc., for transmitting and receiving radio waves to transmit and exchange wireless communication signals.
The antenna system 100 includes a radiator 10, a first feeding end 20, a second feeding end 30, a ground end 40, a first matching circuit 50, a second matching circuit 60, and a third matching circuit 70. The first feeding end 20, the second feeding end 30 and the ground end 40 are disposed at intervals, and the radiator 10 is disposed at one side of the first feeding end 20, the second feeding end 30 and the ground end 40. The first feeding terminal 20 is electrically connected to the radiator 10 through the first matching circuit 50. The second feeding terminal 30 is electrically connected to the radiator 10 through the second matching circuit 60. The ground terminal 40 is electrically connected to the radiator 10 through the third matching circuit 70. The first feeding end 20 is configured to receive a first feeding signal, the antenna system 100 operates in a near field communication mode under the action of the first feeding signal, the second feeding end 30 is configured to receive a second feeding signal, and the antenna system 100 operates in a far field communication mode under the action of the second feeding signal.
It is understood that the first feed signal and the second feed signal are provided by mutually independent signal sources, respectively. For example, the first feed signal may be provided by a near field communication transceiving circuit of the communication terminal; the second feed signal may be provided by far field communication transceiver circuitry of the communication terminal.
It can be understood that, when the antenna system 100 operates in the near field communication mode, the antenna system 100 is used as a near field communication antenna for transceiving near field communication data, such as mobile payment data, door access attendance data, and the like, and the radiator 10 is a part of the near field communication antenna; when the antenna system 100 operates in a far-field communication mode, the antenna system 100 is used as a far-field communication antenna for transceiving far-field communication data, such as voice communication data, video communication data, and the like, and the radiator 10 is a part constituting the far-field communication antenna.
The first matching circuit 50 is configured to cancel an original inductive reactance of the antenna system 100 and increase a resistance of the antenna system 100 when the antenna system 100 operates in the near field communication mode; and for achieving isolation of the second feed signal from the first feed signal and the first feed signal with reference to ground when the antenna system 100 is operating in a far-field communication mode. The second matching circuit 60 is used to implement impedance matching of the antenna system 100 when the antenna system 100 is operating in a far-field communication mode. The third matching circuit 70 is used to make the antenna system 100 resonate at an operating frequency of near field communication when the antenna system 100 operates in a near field communication mode.
Referring to fig. 2, in an alternative embodiment, the first matching circuit 50 includes a first inductor L1, a first capacitor C1 and a first ground reference GND1, one end of the first inductor L1 is electrically connected to the radiator 10, the other end of the first inductor L1 is electrically connected to one end of the first capacitor C1 and the first feed terminal 20, and the other end of the first capacitor C1 is connected to the first ground reference GND 1.
Referring to fig. 3A, in an alternative embodiment, the first matching circuit 50 includes a second inductor L2, a third inductor L3, a second capacitor C2 and a second ground reference GND2, one end of the second inductor L2 is electrically connected to the radiator 10, the other end of the second inductor L2 is electrically connected to one end of the third inductor L3 and one end of the second capacitor C2, the other end of the third inductor L3 is electrically connected to the first feeding terminal 20, and the other end of the second capacitor C2 is electrically connected to the second ground reference GND 2.
Referring to fig. 3B, in an alternative embodiment, the first matching circuit 50 includes a third capacitor C3, a fourth inductor L4, a fifth inductor L5 and a third ground reference GND3, one end of the third capacitor C3 is electrically connected to the radiator 10, the other end of the third capacitor C3 is electrically connected to one end of the fourth inductor L4 and one end of the fifth inductor L5, the other end of the fourth inductor C4 is electrically connected to the first feeding terminal 20, and the other end of the fifth inductor L5 is electrically connected to the third ground reference GND 3.
Referring to fig. 3C, in an alternative embodiment, the first matching circuit 50 includes a fourth capacitor C4, a sixth inductor L6 and a fourth ground reference GND4, the sixth inductor L6 includes a first connection end P1, a second connection end P2 and a third connection end P3, one end of the fourth capacitor C4 is electrically connected to the radiator 10, the other end of the fourth capacitor C4 is electrically connected to the first connection end P1, the second connection end P2 is electrically connected to the first feed-in end 20, and the third connection end P3 is electrically connected to the fourth ground reference GND 4.
In an alternative embodiment, the second matching circuit 60 is related to a specific structural form of the radiator 10. The radiator 10 may be one or a combination of a monopole Antenna configuration, an Inverted-F Antenna (IFA) configuration, a loop Antenna configuration, and a slot Antenna configuration. The second matching circuit 60 may be a circuit structure formed by connecting passive devices such as capacitors, inductors, resistors, and the like in parallel or/and in series.
Referring to fig. 4, in an alternative embodiment, the third matching circuit 70 includes a seventh inductor L7 and a fifth capacitor C5, one end of the seventh inductor L7 is electrically connected to the radiator 10, the other end of the seventh inductor L7 is electrically connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is electrically connected to the ground terminal 40. It is understood that the third matching circuit 70 may also be another circuit structure formed by connecting an inductor, a capacitor in parallel or/and in series, wherein the third matching circuit 70 should at least include an inductor.
Referring to fig. 5, a communication terminal 200 according to a second embodiment of the present invention includes a substrate 210 and an antenna system 100. A first signal source 211, a second signal source 212 and a system ground plane 213 are disposed on the substrate 210. The substrate 210 may be a system circuit board of the communication terminal 200. The communication terminal 200 may be a mobile communication terminal such as a smart phone or a tablet computer. The first signal source 211 is configured to provide a first feeding signal for the antenna system 100, the second signal source 212 is configured to provide a second feeding signal for the antenna system 100, and the ground plane 213 is configured to provide a ground for the antenna system 100.
The antenna system 100 includes a radiator 10, a first feeding end 20, a second feeding end 30, a ground end 40, a first matching circuit 50, a second matching circuit 60, and a third matching circuit 70. The first feeding end 20, the second feeding end 30 and the ground end 40 are disposed at intervals, and the radiator 10 is disposed at one side of the first feeding end 20, the second feeding end 30 and the ground end 40. The first feeding terminal 20 is electrically connected to the radiator 10 through the first matching circuit 50. The second feeding terminal 30 is electrically connected to the radiator 10 through the second matching circuit 60. The ground terminal 40 is electrically connected to the radiator 10 through the third matching circuit 70. The first signal source 211 is electrically connected to the first feeding end 20, the first feeding end 20 is configured to receive the first feeding signal, and the antenna system 100 operates in a near field communication mode under the action of the first feeding signal; the second signal source 212 is electrically connected to the second feeding end 30, the second feeding end 30 is configured to receive the second feeding signal, and the antenna system 100 operates in a far-field communication mode under the action of the second feeding signal.
It can be understood that, when the antenna system 100 operates in the near field communication mode, the antenna system 100 is used as a near field communication antenna for transceiving near field communication data, such as mobile payment data, door access attendance data, and the like, and the radiator 10 is a part of the near field communication antenna; when the antenna system 100 operates in a far-field communication mode, the antenna system 100 is used as a far-field communication antenna for transceiving far-field communication data, such as voice communication data, video communication data, and the like, and the radiator 10 is a part constituting the far-field communication antenna.
The first matching circuit 50 is configured to cancel an original inductive reactance of the antenna system 100 and increase a resistance of the antenna system 100 when the antenna system 100 operates in the near field communication mode; and for achieving isolation of the second feed signal from the first feed signal and the first feed signal with reference to ground when the antenna system 100 is operating in a far-field communication mode. The second matching circuit 60 is used to implement impedance matching of the antenna system 100 when the antenna system 100 is operating in a far-field communication mode. The third matching circuit 70 is used to make the antenna system 100 resonate at an operating frequency of near field communication when the antenna system 100 operates in a near field communication mode.
Referring to fig. 2, in an alternative embodiment, the first matching circuit 50 includes a first inductor L1, a first capacitor C1 and a first ground reference GND1, one end of the first inductor L1 is electrically connected to the radiator 10, the other end of the first inductor L1 is electrically connected to one end of the first capacitor C1 and the first feed terminal 20, and the other end of the first capacitor C1 is connected to the first ground reference GND 1.
Referring to fig. 3A, in an alternative embodiment, the first matching circuit 50 includes a second inductor L2, a third inductor L3, a second capacitor C2 and a second ground reference GND2, one end of the second inductor L2 is electrically connected to the radiator 10, the other end of the second inductor L2 is electrically connected to one end of the third inductor L3 and one end of the second capacitor C2, the other end of the third inductor L3 is electrically connected to the first feeding terminal 20, and the other end of the second capacitor C2 is electrically connected to the second ground reference GND 2.
Referring to fig. 3B, in an alternative embodiment, the first matching circuit 50 includes a third capacitor C3, a fourth inductor L4, a fifth inductor L5 and a third ground reference GND3, one end of the third capacitor C3 is electrically connected to the radiator 10, the other end of the third capacitor C3 is electrically connected to one end of the fourth inductor L4 and one end of the fifth inductor L5, the other end of the fourth inductor C4 is electrically connected to the first feeding terminal 20, and the other end of the fifth inductor L5 is electrically connected to the third ground reference GND 3.
Referring to fig. 3C, in an alternative embodiment, the first matching circuit 50 includes a fourth capacitor C4, a sixth inductor L6 and a fourth ground reference GND4, the sixth inductor L6 includes a first connection end P1, a second connection end P2 and a third connection end P3, one end of the fourth capacitor C4 is electrically connected to the radiator 10, the other end of the fourth capacitor C4 is electrically connected to the first connection end P1, the second connection end P2 is electrically connected to the first feed-in end 20, and the third connection end P3 is electrically connected to the fourth ground reference GND 4.
In an alternative embodiment, the second matching circuit 60 is related to a specific structural form of the radiator 10. The radiator 10 may be one or a combination of a monopole Antenna configuration, an Inverted-F Antenna (IFA) configuration, a loop Antenna configuration, and a slot Antenna configuration. The second matching circuit 60 may be a circuit structure formed by connecting passive devices such as capacitors, inductors, resistors, and the like in parallel or/and in series.
Referring to fig. 4, in an alternative embodiment, the third matching circuit 70 includes a seventh inductor L7 and a fifth capacitor C5, one end of the seventh inductor L7 is electrically connected to the radiator 10, the other end of the seventh inductor L7 is electrically connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is electrically connected to the ground terminal 40. It is understood that the third matching circuit 70 may also be another circuit structure formed by connecting an inductor, a capacitor in parallel or/and in series, wherein the third matching circuit 70 should at least include an inductor.
It is understood that the communication terminal 200 may be a terminal having a metal bezel or/and a metal back case structure, and a portion of the metal bezel or/and a portion of the metal back case is a portion of the radiator 10. The antenna system 100 operates in a near field communication mode by feeding the first feed signal to the radiator 10 alone in combination with the first matching circuit 50 and the third matching circuit 70; or the second feed signal is fed to the radiator 10 separately, and the antenna system 100 operates in a far field communication mode in combination with the second matching circuit 60. Accordingly, the antenna system 100 can be switched between the near field communication mode and the far field communication mode without changing the structure of the radiator 10.
According to the antenna system 100 of the present invention, the first matching circuit 50, the second matching circuit 60, and the third matching circuit 70 are added to the existing far-field communication antenna system, and the first feed-in terminal 20 receives the first feed-in signal, so that the antenna system 100 operates in the near-field communication mode under the action of the first feed-in signal, and the second feed-in terminal 30 receives the second feed-in signal, so that the antenna system 100 operates in the far-field communication mode under the action of the second feed-in signal, thereby implementing the sharing of the far-field communication antenna and the NFC antenna, without designing a separate NFC antenna, effectively controlling the overall size and complexity of the antenna system 100 and the communication terminal 200, and reducing the production cost.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (20)
1. An antenna system for transmitting and receiving wireless communication signals, the antenna system comprising a radiator, a first feed-in end and a first matching circuit, the first feed-in end being electrically connected to the radiator through the first matching circuit, the first feed-in end being configured to receive a first feed-in signal, the antenna system being configured to operate in a near field communication mode under the action of the first feed-in signal, the first matching circuit being configured to cancel an original inductive reactance of the antenna system and increase a resistance of the antenna system when the antenna system operates in the near field communication mode; the antenna system further comprises a second feed-in terminal and a second matching circuit, the second feed-in terminal and the first feed-in terminal are arranged at intervals, the second feed-in terminal is used for receiving a second feed-in signal, and the antenna system works in a far-field communication mode under the action of the second feed-in signal.
2. The antenna system of claim 1, wherein the first matching circuit is further configured to achieve isolation of the second feed signal from the first feed signal and a first feed signal reference ground when the antenna system is operating in a far-field communication mode.
3. The antenna system of claim 1, wherein the second matching circuit is configured to achieve impedance matching of the antenna system when the antenna system is operating in a far field communication mode.
4. The antenna system of claim 1, further comprising a ground terminal and a third matching circuit, wherein the ground terminal is spaced apart from the first feeding terminal and the second feeding terminal, and the ground terminal is electrically connected to the radiator through the third matching circuit.
5. The antenna system of claim 4, wherein the third matching circuit is to resonate the antenna system at an operating frequency for near field communication when the antenna system is operating in a near field communication mode.
6. The antenna system of any of claims 1-5, wherein the first matching circuit comprises a first inductor, a first capacitor, and a first reference ground, wherein one end of the first inductor is electrically connected to the radiator, the other end of the first inductor is electrically connected to one end of the first capacitor and the first feed terminal, and the other end of the first capacitor is connected to the first reference ground.
7. The antenna system according to any of claims 1-5, wherein the first matching circuit comprises a second inductor, a third inductor, a second capacitor, and a second reference ground, wherein one end of the second inductor is electrically connected to the radiator, the other end of the second inductor is electrically connected to one end of the third inductor and one end of the second capacitor, the other end of the third inductor is electrically connected to the first feeding terminal, and the other end of the second capacitor is electrically connected to the second reference ground.
8. The antenna system according to any of claims 1-5, wherein the first matching circuit comprises a third capacitor, a fourth inductor, a fifth inductor, and a third reference ground, wherein one end of the third capacitor is electrically connected to the radiator, the other end of the third capacitor is electrically connected to one end of the fourth inductor and one end of the fifth inductor, the other end of the fourth inductor is electrically connected to the first feeding terminal, and the other end of the fifth inductor is electrically connected to the third reference ground.
9. The antenna system of any of claims 1-5, wherein the first matching circuit comprises a fourth capacitor, a sixth inductor, and a fourth reference ground, the sixth inductor comprising a first connection terminal, a second connection terminal, and a third connection terminal, the fourth capacitor having one end electrically connected to the radiator and another end electrically connected to the first connection terminal, the second connection terminal electrically connected to the first feed terminal, and the third connection terminal electrically connected to the fourth reference ground.
10. The antenna system of claim 4, wherein the third matching circuit comprises a seventh inductor and a fifth capacitor, one end of the seventh inductor is electrically connected to the radiator, the other end of the seventh inductor is electrically connected to one end of the fifth capacitor, and the other end of the fifth capacitor is electrically connected to the ground.
11. A communication terminal comprises a substrate, wherein a first signal source is arranged on the substrate, and the communication terminal is characterized by further comprising an antenna system, wherein the antenna system comprises a radiating body, a first feed-in end and a first matching circuit, the first feed-in end is electrically connected with the radiating body through the first matching circuit, the first signal source is electrically connected with the first feed-in end and is used for providing a first feed-in signal for the antenna system, the antenna system works in a near field communication mode under the action of the first feed-in signal, and the first matching circuit is used for offsetting the original inductive reactance of the antenna system and increasing the resistance of the antenna system when the antenna system works in the near field communication mode; the substrate is also provided with a second signal source; the antenna system further comprises a second feed-in end and a second matching circuit, the second feed-in end and the first feed-in end are arranged at intervals, the second signal source is electrically connected with the second feed-in end and used for providing a second feed-in signal for the antenna system, and the antenna system works in a far-field communication mode under the action of the second feed-in signal.
12. The communication terminal of claim 11, wherein the first matching circuit is further configured to isolate the second feed signal from the first feed signal and a reference ground of the first feed signal when the antenna system is operating in a far-field communication mode.
13. The communication terminal of claim 11, wherein the second matching circuit is configured to achieve impedance matching of the antenna system when the antenna system is operating in a far field communication mode.
14. The communication terminal of claim 11, wherein a system ground plane is further provided on the substrate; the antenna system further comprises a grounding terminal and a third matching circuit, the grounding terminal is arranged at intervals with the first feed-in terminal and the second feed-in terminal, the system grounding surface is electrically connected with the grounding terminal and used for providing grounding for the antenna system, and the grounding terminal is electrically connected with the radiator through the third matching circuit.
15. The communication terminal of claim 14, wherein the third matching circuit is configured to resonate the antenna system at an operating frequency for near field communication when the antenna system is operating in a near field communication mode.
16. The communication terminal according to any of claims 11-15, wherein the first matching circuit comprises a first inductor, a first capacitor and a first reference ground, wherein one end of the first inductor is electrically connected to the radiator, the other end of the first inductor is electrically connected to one end of the first capacitor and the first feeding terminal, and the other end of the first capacitor is connected to the first reference ground.
17. The communication terminal according to any of claims 11-15, wherein the first matching circuit comprises a second inductor, a third inductor, a second capacitor and a second reference ground, wherein one end of the second inductor is electrically connected to the radiator, the other end of the second inductor is electrically connected to one end of the third inductor and one end of the second capacitor, the other end of the third inductor is electrically connected to the first feeding terminal, and the other end of the second capacitor is electrically connected to the second reference ground.
18. The communication terminal according to any of claims 11-15, wherein the first matching circuit comprises a third capacitor, a fourth inductor, a fifth inductor and a third reference ground, wherein one end of the third capacitor is electrically connected to the radiator, the other end of the third capacitor is electrically connected to one end of the fourth inductor and one end of the fifth inductor, the other end of the fourth inductor is electrically connected to the first feeding terminal, and the other end of the fifth inductor is electrically connected to the third reference ground.
19. The communication terminal according to any of claims 11-15, wherein the first matching circuit comprises a fourth capacitor, a sixth inductor and a fourth reference ground, the sixth inductor comprises a first connection terminal, a second connection terminal and a third connection terminal, the fourth capacitor is electrically connected to the radiator at one end and the first connection terminal at the other end, the second connection terminal is electrically connected to the first feed terminal, and the third connection terminal is electrically connected to the fourth reference ground.
20. The communication terminal of claim 14, wherein the third matching circuit comprises a seventh inductor and a fifth capacitor, one end of the seventh inductor is electrically connected to the radiator, the other end of the seventh inductor is electrically connected to one end of the fifth capacitor, and the other end of the fifth capacitor is electrically connected to the ground terminal.
Priority Applications (1)
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| CN105514624B (en) * | 2015-12-23 | 2018-06-22 | 广东欧珀移动通信有限公司 | A kind of mobile terminal antenna system and mobile terminal |
| CN105703790B (en) * | 2016-01-18 | 2018-03-30 | 广东欧珀移动通信有限公司 | Mobile terminal |
| CN105811103B (en) * | 2016-04-27 | 2018-12-11 | 广东欧珀移动通信有限公司 | Antenna assembly and mobile terminal |
| CN105977614B (en) * | 2016-05-30 | 2020-02-07 | 北京小米移动软件有限公司 | Communication antenna, control method and device of communication antenna and terminal |
| CN205693664U (en) | 2016-06-08 | 2016-11-16 | 华硕电脑股份有限公司 | Communicator |
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| CN108321542A (en) | 2018-07-24 |
| CN104953289A (en) | 2015-09-30 |
| CN104953289B (en) | 2018-01-19 |
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