CN104184488A - Radio frequency matching circuit and wireless communication apparatus - Google Patents
Radio frequency matching circuit and wireless communication apparatus Download PDFInfo
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- CN104184488A CN104184488A CN201310200136.2A CN201310200136A CN104184488A CN 104184488 A CN104184488 A CN 104184488A CN 201310200136 A CN201310200136 A CN 201310200136A CN 104184488 A CN104184488 A CN 104184488A
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Abstract
The invention provides a radio frequency matching circuit electrically connected between an antenna and a radio frequency module. The radio frequency matching circuit is composed of a first admittance circuit and a second admittance circuit; the first admittance circuit is connected in series between the antenna and the radio frequency module and the admittance of the first admittance circuit can be adjusted so as to adjust the low-frequency resonant frequency of the antenna at different working frequency bands; one end of the second admittance circuit is electrically connected between the radio frequency module and the first admittance circuit and the other end is grounded, thereby offsetting the influence on the high-frequency signal by the first admittance circuit. In addition, the invention also provides a wireless communication apparatus using the radio frequency matching circuit. According to the wireless communication apparatus, on the basis of the adjustable admittance, the matching parameter of the matching circuit is adjusted, thereby improving the frequency range of the antenna coverage and reducing the requirement on the antenna clearance zone. Moreover, the circuit has the simple structure, thereby realizing miniaturization development of the wireless communication apparatus conveniently.
Description
Technical field
The present invention relates to a kind of circuit structure, relate in particular to a kind of radio frequency matching circuit for multifrequency antenna and apply the radio communication device of this radio frequency matching circuit.
Background technology
Along with radio communication vigorous growth, antenna is as the necessary assembly of radio communication device, its signal frequency range receiving in low-frequency range becomes more and more wider, and will increase the frequency range of antenna reception and make it have enough radiation efficiencies, need to increase the headroom district of antenna.But, under the trend of day by day dwindling at radio communication device, increase the comparatively difficulty of headroom district that antenna needs.
Current a kind of solution is to be antenna multiple match circuits of arranging in pairs or groups, and recycling diverter switch, carries out impedance matching to low-band signal respectively.That is, a match circuit only need mate the frequency range of single frequency band (such as 880-960 MHz or 824-894 MHz etc.), in the time mating the frequency range of other frequency bands, switches by diverter switch.Though the method can reduce the demand of antenna to headroom district, but match circuit can affect whole antenna system, in the time adjusting the matched impedance of low-frequency range, tend to cause the impedance mismatch of high band, and this kind of method need to increase diverter switch and organize match circuit more, take larger circuit layout space, be unfavorable for the miniaturization development trend of radio communication device.
Summary of the invention
In view of above situation, be necessary to provide a kind of radio frequency matching circuit for multifrequency antenna.
Separately, be necessary to provide a kind of application above-mentioned radio frequency matching circuit radio communication device.
A kind of radio frequency matching circuit, be electrically connected between an antenna and a radio-frequency module, described radio frequency matching circuit comprises the first transfer admittance circuit and the second transfer admittance circuit, described the first transfer admittance circuit is connected between antenna and radio-frequency module, the admittance of the first transfer admittance circuit is adjustable, to adjust the resonance frequency of antenna at the low frequency of different operating frequency range; Described second transfer admittance circuit one end is electrically connected between radio-frequency module and the first transfer admittance circuit, and other end ground connection, to offset the impact of the first transfer admittance circuit on high-frequency signal.
A kind of radio communication device, it comprises antenna, radio-frequency module and radio frequency matching circuit, described radio frequency matching circuit comprises the first transfer admittance circuit and the second transfer admittance circuit, described the first transfer admittance circuit is connected between antenna and radio-frequency module, the admittance of the first transfer admittance circuit is adjustable, to adjust the resonance frequency of antenna at the low frequency of different operating frequency range; Described second transfer admittance circuit one end is electrically connected between radio-frequency module and the first transfer admittance circuit, other end ground connection, and to offset the impact of the first transfer admittance circuit on high-frequency signal, described radio frequency matching circuit is electrically connected between antenna and radio-frequency module.
Above-mentioned radio communication device is by adjustable admittance,, regulate the match parameter of match circuit, improve the frequency range that antenna is contained, reduced the requirement to antenna headroom district, and circuit structure is simple, be convenient to the miniaturization development of radio communication device.
Brief description of the drawings
Fig. 1 is the circuit diagram of radio frequency matching circuit the first embodiment of the present invention.
Fig. 2 is the circuit diagram of radio frequency matching circuit the second embodiment of the present invention.
Fig. 3 is the circuit diagram of radio frequency matching circuit of the present invention the 3rd embodiment.
Fig. 4 is the circuit diagram of radio frequency matching circuit of the present invention the 4th embodiment.
Fig. 5 is the circuit diagram of radio frequency matching circuit of the present invention the 5th embodiment.
Fig. 6 is the circuit diagram of radio frequency matching circuit of the present invention the 6th embodiment.
Fig. 7 is the circuit diagram of radio frequency matching circuit of the present invention the 7th embodiment.
Fig. 8 is the circuit diagram of radio frequency matching circuit of the present invention the 8th embodiment.
Fig. 9 is the return loss plot of the 5th embodiment of radio frequency matching circuit shown in Fig. 5.
Figure 10 is the radiation efficiency figure of the 5th embodiment of radio frequency matching circuit shown in Fig. 5.
Main element symbol description
| Radio communication device | 100 |
| Radio frequency matching circuit | 10 |
| The first transfer admittance circuit | 11 |
| The second transfer admittance circuit | 12 |
| Antenna | 20 |
| Tunable capacitor | C |
| Controllable impedance | L |
| The first electric capacity | C1 |
| The second electric capacity | C2 |
| The first inductance | L1 |
| The second inductance | L2 |
| Radio-frequency module | 30 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, the invention provides a kind of radio frequency matching circuit 10, it is applied in radio communication device 100.This radio communication device 100 can have for mobile phone, flat computer etc. the electronic installation of radio communication function, comprises antenna 20 and radio-frequency module 30, and this radio frequency matching circuit 10 is electrically connected between antenna 20 and radio-frequency module 30.
The signal of telecommunication that this antenna 20 can received RF module 30 transmits also converts radio wave transmission to, also the radio wave receiving can be converted to the signal of telecommunication and is transferred to radio-frequency module 30.This antenna 20 can be received and dispatched the signal of different frequency range.
This radio frequency matching circuit 10 comprises the first transfer admittance circuit 11 and the second transfer admittance circuit 12 that are electrically connected at successively between antenna 20 and radio-frequency module 30.The first transfer admittance circuit 11 is connected in series between antenna 20 and radio-frequency module 30.Between the first transfer admittance circuit 11 and radio-frequency module 30 that one end of the second transfer admittance circuit 12 is electrically connected at, other end ground connection.
In the first embodiment of the present invention, this first transfer admittance circuit 11 comprises tunable capacitor C, and it is connected between antenna 20 and radio-frequency module 30.This second transfer admittance circuit 12 comprises the first inductance L 1, and one end of this first inductance L 1 is electrically connected between radio-frequency module 30 and tunable capacitor C, other end ground connection.This tunable capacitor C can be according to peripheral control circuit (not shown), as the micro-control unit of radio communication device 100 (microcontroller unit, MCU), for example, adjust capacitance according to the voltage control signal (high level or low level) of different working frequency range output, thereby the impedance with the first inductance L 1 is mated antenna 20 jointly, makes antenna 20 meet the requirement of different operating frequency range at the resonance frequency of low frequency.
Refer to Fig. 2, the second embodiment of the present invention and the first embodiment are roughly the same, different, and the first transfer admittance circuit 11 comprises controllable impedance L, and it is connected between antenna 20 and radio-frequency module 30.This controllable impedance L can for example, adjust inductance value according to the voltage control signal (high level or low level) of peripheral control circuit output, thus the impedance of mating antenna 20 together with the first inductance L 1.
Refer to Fig. 3, the third embodiment of the present invention and the first embodiment are roughly the same, different, and this second transfer admittance circuit 12 also comprises first capacitor C 1 in parallel with the first inductance L 1, to offset the first impact of inductance L 1 on high-frequency signal.Preferably, this first capacitor C 1 one end is connected between the first inductance L 1 and radio-frequency module 30, other end ground connection.
Refer to Fig. 4, the fourth embodiment of the present invention and the first embodiment are roughly the same, different, and this first transfer admittance circuit 11 also comprises the second inductance L 2 being in series with tunable capacitor C, to offset the impact of controllable impedance L on high-frequency signal.Preferably, this second inductance L 2 is connected between tunable capacitor C and antenna 20.This second inductance L 2 can be a controllable impedance.
Refer to Fig. 5, the fifth embodiment of the present invention and the 4th embodiment are roughly the same, different, and this second transfer admittance circuit 12 also comprises first capacitor C 1 in parallel with the first inductance L 1, to offset the first impact of inductance L 1 on high-frequency signal signal.Preferably, this first capacitor C 1 one end is connected between the first inductance L 1 and radio-frequency module 30, other end ground connection.
Refer to Fig. 6, the sixth embodiment of the present invention and the second embodiment are roughly the same, different, and this second transfer admittance circuit 12 also comprises the first capacitor C 1, to offset the first impact of inductance L 1 on high-frequency signal.Preferably, this first capacitor C 1 one end is connected between radio-frequency module 30 and the first inductance L 1, other end ground connection.
Refer to Fig. 7, the seventh embodiment of the present invention and the second embodiment are roughly the same, different, and this first transfer admittance circuit 11 also comprises the second capacitor C 2, in order to offset the impact of controllable impedance L on high-frequency signal.Preferably, this second capacitor C 2 is connected between radio-frequency module 30 and controllable impedance L.
Refer to Fig. 8, the eighth embodiment of the present invention and the 7th embodiment are roughly the same, different, and this second transfer admittance circuit 12 also comprises the first capacitor C 1, to offset the first impact of inductance L 1 on high-frequency signal.Preferably, this first capacitor C 1 one end is connected between radio-frequency module 30 and the first inductance L 1, other end ground connection.
Utilized the radio frequency matching circuit of Fig. 5 by Fig. 9 and Figure 10 system, obtain three groups of antenna 20 by curve a, b, different return loss and the radiation efficiency of c representative by adjusting the value of tunable capacitor C.From Fig. 9 and Figure 10, radio frequency matching circuit 10 of the present invention is arranged in pairs or groups after antenna 20, antenna 20 has preferably radiation efficiency, antenna 20 can or more adjust high frequency from 746 MHz to 980 MHz in the frequency of operation of low-frequency range, and the reflection coefficient of high band and radiation efficiency can not be affected substantially and degrading radiation efficiency.
The admittance of the first transfer admittance circuit 11 of this radio frequency matching circuit 10 can be by regulating the inductance of controllable impedance L or the electric capacity of tunable capacitor C to regulate, thereby impedance matching is carried out in the input impedance to antenna 20 when the different low frequency frequency ranges, adjust the resonance frequency of antenna 20 at low frequency, make antenna 20 in the resonance frequency adjusting range of low frequency extensively and more continuous, improve the Frequency scope that antenna 20 is contained, reduced the requirement of antenna to headroom district.Meanwhile, by increasing the first capacitor C 1, the second capacitor C 2 or the second inductance L 2, to offset the impact of radio frequency matching circuit 10 on high-frequency signal.
Although the preferred embodiment of the present invention is illustrated and is described, the art personnel will realize, and can make different variations, and these do not exceed scope of the present invention.Therefore expect, the present invention is not limited to disclosed conduct and realizes the contemplated preferred forms of the present invention.
Claims (12)
1. a radio frequency matching circuit, be electrically connected between an antenna and a radio-frequency module, it is characterized in that: described radio frequency matching circuit comprises the first transfer admittance circuit and the second transfer admittance circuit, described the first transfer admittance circuit is connected between antenna and radio-frequency module, the admittance of the first transfer admittance circuit is adjustable, to adjust the resonance frequency of antenna at the low frequency of different operating frequency range; Described second transfer admittance circuit one end is electrically connected between radio-frequency module and the first transfer admittance circuit, and other end ground connection, to offset the impact of the first transfer admittance circuit on high-frequency signal.
2. radio frequency matching circuit as claimed in claim 1, it is characterized in that: described the first transfer admittance circuit comprises tunable capacitor, described tunable capacitor is connected between antenna and radio-frequency module, described the second transfer admittance circuit comprises the first inductance, one end of described the first inductance is electrically connected between radio-frequency module and tunable capacitor, other end ground connection.
3. radio frequency matching circuit as claimed in claim 2, it is characterized in that: described the second transfer admittance circuit also comprises the first electric capacity, described first electric capacity one end is connected between the first inductance and radio-frequency module, and other end ground connection, to offset the impact of the first inductance on high-frequency signal.
4. radio frequency matching circuit as claimed in claim 2, is characterized in that: described the first transfer admittance circuit also comprises the second inductance, and described the second inductance is connected between tunable capacitor and antenna, to offset the impact of controllable impedance on high-frequency signal.
5. radio frequency matching circuit as claimed in claim 4, is characterized in that: described the second inductance is controllable impedance.
6. radio frequency matching circuit as claimed in claim 4, it is characterized in that: described the second transfer admittance circuit also comprises the first electric capacity, described first electric capacity one end is connected between the first inductance and radio-frequency module, and other end ground connection, to offset the impact of the first inductance on high-frequency signal signal.
7. radio frequency matching circuit as claimed in claim 6, is characterized in that: described the second inductance is controllable impedance.
8. radio frequency matching circuit as claimed in claim 1, it is characterized in that: described the first transfer admittance circuit comprises controllable impedance, described controllable impedance is connected between antenna and radio-frequency module, described the second transfer admittance circuit comprises the first inductance, one end of described the first inductance is electrically connected between radio-frequency module and controllable impedance, other end ground connection.
9. radio frequency matching circuit as claimed in claim 8, it is characterized in that: described the second transfer admittance circuit comprises the first electric capacity, described first electric capacity one end is connected between the first inductance and radio-frequency module, and other end ground connection, to offset the impact of the first inductance on high-frequency signal.
10. radio frequency matching circuit as claimed in claim 8, is characterized in that: described this first transfer admittance circuit also comprises the second electric capacity, described the second capacitances in series is between radio-frequency module and controllable impedance, to offset the impact of controllable impedance on high-frequency signal.
11. radio frequency matching circuits as claimed in claim 8, it is characterized in that: described the second transfer admittance circuit comprises the first electric capacity, described first electric capacity one end is connected between the first inductance and radio-frequency module, and other end ground connection, to offset the impact of the first inductance on high-frequency signal.
12. 1 kinds of radio communication devices, it comprises antenna and radio-frequency module, it is characterized in that: described radio communication device also comprises the radio frequency matching circuit as described in 1 to 11 any one of claim the, and described radio frequency matching circuit is electrically connected between antenna and radio-frequency module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310200136.2A CN104184488A (en) | 2013-05-27 | 2013-05-27 | Radio frequency matching circuit and wireless communication apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310200136.2A CN104184488A (en) | 2013-05-27 | 2013-05-27 | Radio frequency matching circuit and wireless communication apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104184488A true CN104184488A (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310200136.2A Pending CN104184488A (en) | 2013-05-27 | 2013-05-27 | Radio frequency matching circuit and wireless communication apparatus |
Country Status (1)
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| CN (1) | CN104184488A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901710A (en) * | 2015-06-14 | 2015-09-09 | 徐园园 | Simple radio frequency adjustable match circuit |
| CN105306090A (en) * | 2015-09-23 | 2016-02-03 | 青岛海信移动通信技术股份有限公司 | Antenna matching circuit and system and mobile terminal |
| CN105742818A (en) * | 2016-03-25 | 2016-07-06 | 联想(北京)有限公司 | Antenna and control method |
| CN106921050A (en) * | 2017-02-10 | 2017-07-04 | 上海斐讯数据通信技术有限公司 | A kind of device and method for reducing antenna for mobile phone return loss |
| CN107710607A (en) * | 2015-07-31 | 2018-02-16 | 株式会社村田制作所 | Antenna-matching circuit, antenna circuit, front-end circuit and communicator |
| WO2022110309A1 (en) * | 2020-11-26 | 2022-06-02 | 捷开通讯(深圳)有限公司 | Antenna apparatus and mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375256A (en) * | 1991-09-04 | 1994-12-20 | Nec Corporation | Broadband radio transceiver |
| CN101997946A (en) * | 2010-11-23 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Adjustable mobile phone antenna matching circuit and mobile phone using same |
| US20110086598A1 (en) * | 2009-10-14 | 2011-04-14 | Research In Motion Limited | Dynamic real-time calibration for antenna matching in a radio frequency receiver system |
-
2013
- 2013-05-27 CN CN201310200136.2A patent/CN104184488A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375256A (en) * | 1991-09-04 | 1994-12-20 | Nec Corporation | Broadband radio transceiver |
| US20110086598A1 (en) * | 2009-10-14 | 2011-04-14 | Research In Motion Limited | Dynamic real-time calibration for antenna matching in a radio frequency receiver system |
| CN101997946A (en) * | 2010-11-23 | 2011-03-30 | 惠州Tcl移动通信有限公司 | Adjustable mobile phone antenna matching circuit and mobile phone using same |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901710A (en) * | 2015-06-14 | 2015-09-09 | 徐园园 | Simple radio frequency adjustable match circuit |
| CN107710607A (en) * | 2015-07-31 | 2018-02-16 | 株式会社村田制作所 | Antenna-matching circuit, antenna circuit, front-end circuit and communicator |
| CN105306090A (en) * | 2015-09-23 | 2016-02-03 | 青岛海信移动通信技术股份有限公司 | Antenna matching circuit and system and mobile terminal |
| CN105742818A (en) * | 2016-03-25 | 2016-07-06 | 联想(北京)有限公司 | Antenna and control method |
| CN106921050A (en) * | 2017-02-10 | 2017-07-04 | 上海斐讯数据通信技术有限公司 | A kind of device and method for reducing antenna for mobile phone return loss |
| WO2022110309A1 (en) * | 2020-11-26 | 2022-06-02 | 捷开通讯(深圳)有限公司 | Antenna apparatus and mobile terminal |
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| PB01 | Publication | ||
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Application publication date: 20141203 |