CN201590488U - Antenna self-adaptive matching circuit and mobile communication terminal with same - Google Patents
Antenna self-adaptive matching circuit and mobile communication terminal with same Download PDFInfo
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- CN201590488U CN201590488U CN2009200285763U CN200920028576U CN201590488U CN 201590488 U CN201590488 U CN 201590488U CN 2009200285763 U CN2009200285763 U CN 2009200285763U CN 200920028576 U CN200920028576 U CN 200920028576U CN 201590488 U CN201590488 U CN 201590488U
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- match circuit
- control circuit
- mobile communication
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Abstract
The utility model discloses an antenna self-adaptive matching circuit and a mobile communication terminal with the same. The antenna self-adaptive matching circuit comprises a blocking capacitor, a varactor and a control circuit capable of outputting direct current voltage with corresponding amplitude according to working frequency of an antenna, the antenna is connected with the varactor via the blocking capacitor, a cathode of the varactor is connected with the control circuit, capacitance of a PN junction capacitor inside the varactor can be changed according to direct current voltage of the control circuit modulated to the cathode of the varactor, and input impedance of the whole matching circuit is changed, then input impedance composition of the antenna is eliminated, and the input impedance can be pure resistance and approaches characteristic impedance of a feeder, thereby keeping the antenna working at the optimum resonance point and then improving performance of the antenna. After the antenna self-adaptive matching circuit is applied to the mobile communication terminal, performance of the antenna in the whole operation bandwidth can be improved as far as possible on the conditions that size and surroundings of the antenna are limited, thereby guaranteeing communication quality of the mobile communication terminal.
Description
Technical field
The utility model belongs to the mobile communication equipment technical field, specifically, relates to a kind of adaptive design scheme of antenna-matching circuit and adopts the designed mobile communication terminal of this antenna self-adaptive match circuit.
Background technology
In any portable terminal, always have one to the space radiation electromagnetic energy with receive the device of electromagnetic energy from the space, this device is exactly an antenna.The effect of antenna is converted into the high-frequency signal electric current with frequency electromagnetic waves exactly, and digital signal or the analog signal that is modulated to rf frequency is transmitted into the spacing wireless channel, or receives digital signal or the analog signal that is modulated on the rf frequency from the spacing wireless channel.In essence, antenna is exactly a kind of transducing head, perhaps is energy conversion device, and it is bridge and the tie that space outerpace electromagnetic wave or electromagnetic field and internal circuit are got in touch, and does not have antenna also just not have radio communication.
Continuous development along with mechanics of communication, the particularly operation of 3G standard, modern mobile phones design more and more develops to directions such as multiband, multi-mode, miniaturizations, higher to size, the environmental requirement of antenna in this case, need wideer working band, the antenna for mobile phone design also faces increasing challenge.Different with design such as antenna for base station, as the parts that need design separately and debugging in the mobile phone circuit, the antenna for mobile phone design is subjected to the restriction of surrounding environment, need the factor of consideration a lot, the device (as loud speaker, camera, motor etc.) around the antenna, the layer structure of PCB, casing material etc. all can have a direct impact antenna performance.
In such cases,, must there be a kind of method to improve antenna performance in order to guarantee communication efficiency.Measure commonly used at present is: 1, the operational environment that as far as possible provides to antenna.Because the maximum bandwidth that antenna can reach is directly proportional with the antenna occupation space, therefore, for Antenna Design, obtain big bandwidth, must guarantee to reserve enough spaces into antenna.But, will certainly make the thickening of handset size lengthening like this, thereby influence the attractive in appearance of mobile phone and fashion type.2, do compromise.Promptly make certain section band performance optimum in the whole working bandwidth as far as possible, guarantee that antenna input impedance in this section frequency band is pure resistance, near the 50ohm impedance.But, for present three frequently, four multi-frequency mobile phones frequently even more, can not guarantee the antenna performance of whole working bandwidth, and then influence the overall performance and the communication quality of mobile phone.
The utility model content
The purpose of this utility model be to provide a kind of can be according to the change of mobile communication terminal working frequency range and change the antenna self-adaptive match circuit of the input impedance of antenna-matching circuit automatically, under the limited situation of antenna size, surrounding environment, improve the performance of antenna in whole working bandwidth as far as possible, guarantee the communication quality of mobile communication terminal.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of antenna self-adaptive match circuit comprises that capacitance, varactor and one can be according to the operating frequency output of the antenna control circuits of the direct voltage of corresponding amplitude with it; Antenna connects varactor by described capacitance, the negative pole of described varactor connects described control circuit, the direct voltage size that is modulated to its negative pole according to described control circuit changes the capacity of its inner PN junction electric capacity, and then change the input impedance of whole match circuit, reach the purpose of design of matched well.
Further, in described control circuit, include a processor, described processor is determined the amplitude of corresponding with it direct voltage according to the operating frequency of antenna, and then export the amplitude of described direct voltage to a digital to analog converter and generate the analog DC voltage of respective magnitudes with conversion, export described varactor to.
Further again, in described control circuit, also include a register, described register can be built in the processor or external described processor, described processor is searched the frequency/voltage parameter list of preserving in the register according to the operating frequency of antenna, and then the amplitude of the definite direct voltage that will export.
Further again, for make the variation relative equilibrium of Antenna Impedance Matching in frequency band some, to obtain satisfied matching effect, at the concrete condition of the pcb board of practical application, can between the negative pole of described varactor and described control circuit, select to be connected one-level or multistage L type match circuit or ∏ type match circuit; Described L type match circuit or ∏ type match circuit can specifically adopt inductance and electric capacity to make up and form.
Further, also can connect one-level or multistage L type match circuit or the ∏ type match circuit of forming by inductance and electric capacity between described antenna and the antenna switch module, to improve matching effect.
In conjunction with above-mentioned antenna self-adaptive match circuit structure, the utility model provides a kind of mobile communication terminal that adopts described Adaptive matching circuit design again, comprise antenna, antenna switch module and baseband processor, described Adaptive matching circuit is connected between antenna and the antenna switch module, after at first utilizing the flip-flop filtering of capacitance in the antenna self-adaptive match circuit with baseband processor output, transfer to described varactor, with the high-frequency signal that prevents that flip-flop from having influence on emission or receiving; Utilize then one can according to the output of the operating frequency of antenna with it the control circuit of the direct voltage of corresponding amplitude change the magnitude of voltage that is modulated to described varactor negative pole, and then the PN junction capacitance of varactor inside is changed thereupon, to realize the change of whole match circuit input impedance, make antenna can be operated in the optimum resonance frequency.
In order to save the hardware circuit cost of described mobile communication terminal, described control circuit preferably adopts inner original baseband processor of mobile communication terminal and digital to analog converter to set up and realizes.Described digital to analog converter can be built in the baseband processor, promptly adopts the baseband processor that is built-in with digital to analog converter to design described control circuit; Also can adopt the independently external described baseband processor of digital to analog converter, to form described control circuit.
Compared with prior art, advantage of the present utility model and good effect are: antenna self-adaptive match circuit of the present utility model can change the input impedance of antenna-matching circuit with the variation of the current working frequency of antenna thereupon, can eliminate the input reactance composition of antenna thus, making input impedance is pure resistance and near the characteristic impedance of feeder line as far as possible, thereby can allow antenna be operated in the optimum resonance frequency, realize improving the purpose of design of antenna performance.Described antenna self-adaptive match circuit is applied in the present mobile communication terminal, can under the limited situation of antenna size, surrounding environment, improves the performance of antenna in whole working bandwidth as far as possible, and then can guarantee the communication quality of mobile communication terminal.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the antenna self-adaptive match circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the antenna self-adaptive match circuit that proposes of the utility model;
Fig. 3 is the schematic diagram of two-stage L type match circuit;
Fig. 4 is the schematic diagram of one-level ∏ type match circuit.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Embodiment one, present embodiment has adaptive ability in order to make antenna-matching circuit, promptly can be and automatically adjust the input impedance of antenna-matching circuit according to the change of mobile communication terminal working frequency range, and eliminate the input reactance composition of antenna with this, reach good matching effect, propose antenna self-adaptive match circuit structure as shown in Figure 1, comprised capacitance C, varactor D and control circuit.Described capacitance C is connected between the negative pole of antenna and varactor D, after the flip-flop filtering with baseband processor output, transfers to described varactor D, to prevent flip-flop the high-frequency signal of emission or reception is impacted.The plus earth of described varactor D, negative pole connects wherein one road dc voltage output end of control circuit.Described control circuit is one can produce and export the modular circuit of the direct voltage of corresponding amplitude with it according to the operating frequency of antenna, can adopt various ways such as discrete component or integrated process chip to set up and form, present embodiment does not specifically limit this.
When mobile communication terminal was worked, control circuit was determined the direct voltage amplitude that needs are exported according to the current operating frequency of antenna, and then the direct voltage VOUT of generation respective magnitudes is modulated to the negative pole of varactor D.Described varactor D changes the capacity of its inner PN junction electric capacity according to the magnitude of voltage size that is modulated to its negative pole, and then realize the variation of entire antenna match circuit input impedance by the change of himself parameter, making input impedance is pure resistance and near the characteristic impedance of feeder line as far as possible, thereby itself and transmitter or receiver are complementary, effectively finish the power conversion function.
Be example with the mobile phone below, elaborate the specific design method and the operation principle of described antenna self-adaptive match circuit.
Can be for the control circuit that makes present embodiment according to the direct voltage amplitude of its output of change adaptively modifying of antenna work at present frequency, need to determine in advance the corresponding relation between frequency and the voltage magnitude.Its method for designing is: the numerical value of at first measuring or calculate antenna feed impedance on the several Frequency points in the mobile phone whole working bandwidth, to obtain the graph of relation between operating frequency of antenna and the input impedance, be designated as impedance/frequency relation figure, the method that this process can specifically adopt vector network analyzer to test is by experiment finished.Secondly, form the parameter table of comparisons between operating frequency of antenna and the control circuit output dc voltage amplitude, be designated as the frequency/voltage parameter list; This process can be according to the impedance/frequency relation figure that formerly obtains, use Smith chart, adjust the dc voltage value VOUT of control circuit output, utilize varactor D to have the principle of variable capacitance between the PN junction, the corresponding change of input impedance along with the different antennae match circuit of magnitude of voltage VOUT, adjust this magnitude of voltage VOUT up to the input reactance composition of eliminating antenna, making input impedance is pure resistance and near the characteristic impedance of feeder line as far as possible, and the magnitude of voltage VOUT after determining is inserted the frequency/voltage parameter list; Change frequency, repeat this process, to finish described frequency/voltage parameter list.Then, the frequency/voltage parameter list that test is obtained deposits in the mobile phone EMS memory, calls in order to control circuit in the future.
Above-mentioned each process is finished by the commissioning staff before mobile phone dispatches from the factory.For the detection of antenna work at present frequency, can adopt the radio-frequency (RF) receiving and transmission module in the mobile phone to finish.
When the user used mobile phone to carry out communication, the radio-frequency (RF) receiving and transmission module in the mobile phone was set up with the base station and is communicated by letter, and is come to be its allocated channel by the base station, determines operating frequency, and this information is sent to mobile phone.Radio-frequency (RF) receiving and transmission module in the mobile phone transfers to control circuit with operating frequency after receiving this information.Described control circuit is searched the frequency/voltage parameter list according to the operating frequency that receives, to determine the amplitude of its direct voltage VOUT that need export, make antenna can be operated in the optimum resonance frequency, and then reach the purpose of design of matched well, realize significantly improving of antenna performance.
Above-mentioned antenna self-adaptive matching process specifically may further comprise the steps:
101, need to judge whether change antenna match parameter;
Promptly confirm according to present operating handset frequency whether needs are changed the antenna match parameter, and if desired, then execution in step 102; If do not need, then jump to step 104.
102, adjust the control voltage of Adaptive matching circuit, promptly adjust the amplitude of the direct voltage VOUT of control circuit output in the Adaptive matching circuit;
Specifically, can search the frequency/voltage parameter list of preserving in advance in the mobile phone EMS memory by control circuit, and then determine with it corresponding direct voltage amplitude according to the operating frequency of present antenna, produce and export the direct voltage of described amplitude by control circuit, be modulated on the negative pole of varactor D.
103, finish the antenna self-adaptive coupling;
Promptly, the input impedance of whole match circuit is changed thereupon, made antenna satisfy comparatively ideal requirement, finish the antenna self-adaptive coupling at operating frequency place electric property (as return loss, standing-wave ratio etc.) by changing the capacity of the inner PN junction electric capacity of varactor D.
104, determine whether present operating handset frequency changes;
Determine promptly whether the current operating frequency of mobile phone variation has taken place, if change, then returns execution in step 101, and whether present frequency change for confirmation needs to change the antenna match parameter; If do not change, then repeated execution of steps 104, continue to judge.
Antenna self-adaptive match circuit shown in Figure 1 is connected between antenna for mobile phone and the antenna switch module, after the radiofrequency signal process antenna switch module processing by mobile phone internal radio frequency transceiver module modulation output, be transmitted into the spacing wireless channel by antenna self-adaptive match circuit and antenna, and after the radiofrequency signal that sends from the spacing wireless channel receives by antenna and antenna self-adaptive match circuit, through sending into radio-frequency (RF) receiving and transmission module after the antenna switch module processing, utilize the radio frequency processing chip to carry out demodulation process.
Embodiment two, because the design of antenna self-adaptive match circuit and calculating and load impedance have substantial connection, be not that antenna impedance can realize the Adaptive matching of antenna by the PN junction capacitance that changes varactor D arbitrarily, therefore, must use the concrete condition of pcb board that antenna is adopted suitable resistance loading or designs a complementary network according to reality, make the variation relative equilibrium of Antenna Impedance Matching in frequency band some, to obtain satisfied matching effect.
Based on this, present embodiment has been set up two-way L type match circuit again according to the concrete property of PCB, referring to shown in Figure 2 on the basis of match circuit shown in the embodiment one.Wherein one road L type match circuit is made up of inductance L 1 and capacitor C 1, is connected between antenna and the antenna switch module; Other one road L type match circuit is made up of inductance L 2 and capacitor C 2, is connected between the negative pole and control circuit of varactor D.Certainly, described L type match circuit also can only be provided with one the tunnel; Perhaps be arranged to multistage L type match circuit, two-stage L type match circuit as shown in Figure 3; Also or be designed to as shown in Figure 4 ∏ type match circuit, described ∏ type match circuit also can adopt one-level or multistage form to design, and need look the actual conditions of PCB and specifically determine.
In the present embodiment, described control circuit is that example specifically describes with the processor.The frequency/voltage parameter list is kept in the register of processor inside, when the operating frequency of antenna changes, the CPU of processor inside conducts interviews to described register, search the frequency/voltage parameter list of preserving in the register according to the current operating frequency of antenna, and then the amplitude of definite direct voltage VOUT that will export.CPU carries out the conversion of digital signal to analog signal with the pairing digital data transmission of the direct voltage of this amplitude to analog to digital converter DAC, and then the analog DC voltage VOUT that generates respective magnitudes is modulated to the negative pole of varactor D, utilize varactor D to have the characteristic of variable capacitance between the PN junction, change the input impedance of antenna-matching circuit, and then reach the input reactance composition of eliminating antenna, make antenna be operated in the purpose of design of optimum resonance frequency.
Certainly, described frequency/voltage parameter list also can be kept in the register of processor outside, adopts external mode to realize the communication that is connected between processor and the register.Described analog to digital converter DAC can be built in the processor, promptly adopts the processor that is built-in with analog to digital converter DAC to design described control circuit; Also can on the data-out port of processor, connect an independently analog to digital converter DAC, form described control circuit by external mode.
For mobile phone circuit, in order to save the hardware circuit cost of mobile phone, described processor can adopt the inner original baseband processor of mobile phone to realize.
The adjustable extent of antenna self-adaptive match circuit of the present utility model will depend on the transfiguration scope of varactor D fully.Facts have proved: generally choose the transfiguration scope and design described antenna self-adaptive match circuit at the above varactor of 10PF and can guarantee to obtain good matching effect.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be noted that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. antenna self-adaptive match circuit is characterized in that: comprise that capacitance, varactor and one can be according to the operating frequency output of the antenna control circuits of the direct voltage of corresponding amplitude with it; Antenna connects varactor by described capacitance, and the negative pole of described varactor connects described control circuit.
2. antenna self-adaptive match circuit according to claim 1, it is characterized in that: in described control circuit, include a processor, described processor is exported amplitude to a digital to analog converter of corresponding with it direct voltage according to the operating frequency of antenna, conversion generates the analog DC voltage of respective magnitudes, exports described varactor to.
3. antenna self-adaptive match circuit according to claim 2 is characterized in that: also include the register of preserving the frequency/voltage parameter list in described control circuit, described register is built in the processor or external described processor.
4. according to claim 1 or 2 or 3 described antenna self-adaptive match circuits, it is characterized in that: between the negative pole of described varactor and described control circuit, be connected with one-level or multistage L type match circuit or the ∏ type match circuit of forming by inductance and electric capacity.
5. antenna self-adaptive match circuit according to claim 4 is characterized in that: described antenna is connected antenna switch module by one-level or multistage L type match circuit or the ∏ type match circuit of being made up of inductance and electric capacity.
6. a mobile communication terminal comprises antenna and antenna switch module; It is characterized in that: between described antenna and antenna switch module, be connected with an antenna self-adaptive match circuit, comprise that capacitance, varactor and one can be according to the operating frequency output of the antenna control circuits of the direct voltage of corresponding amplitude with it; Described antenna connects described varactor by capacitance, and the negative pole of described varactor connects described control circuit.
7. mobile communication terminal according to claim 6, it is characterized in that: in described control circuit, include a processor, described processor is exported amplitude to a digital to analog converter of corresponding with it direct voltage according to the operating frequency of antenna, conversion generates the analog DC voltage of respective magnitudes, exports described varactor to.
8. mobile communication terminal according to claim 7 is characterized in that: also include the register of preserving the frequency/voltage parameter list in described control circuit, described register is built in the processor or external described processor.
9. according to claim 6 or 7 or 8 described mobile communication terminals, it is characterized in that: between the negative pole of described varactor and described control circuit, be connected with one-level or multistage L type match circuit or the ∏ type match circuit of forming by inductance and electric capacity.
10. mobile communication terminal according to claim 9 is characterized in that: described antenna is connected antenna switch module by one-level or multistage L type match circuit or the ∏ type match circuit of being made up of inductance and electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200285763U CN201590488U (en) | 2009-06-25 | 2009-06-25 | Antenna self-adaptive matching circuit and mobile communication terminal with same |
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| CN2009200285763U CN201590488U (en) | 2009-06-25 | 2009-06-25 | Antenna self-adaptive matching circuit and mobile communication terminal with same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN103928758A (en) * | 2014-03-19 | 2014-07-16 | 深圳市创荣发电子有限公司 | Antenna structure of wireless product |
| CN104518812A (en) * | 2014-12-01 | 2015-04-15 | 惠州Tcl移动通信有限公司 | Mobile terminal switching antenna and switching method thereof |
| CN104681984A (en) * | 2013-11-29 | 2015-06-03 | 深圳富泰宏精密工业有限公司 | Wireless communication device |
| US9184494B1 (en) | 2014-05-09 | 2015-11-10 | Futurewei Technologies, Inc. | Switchable Pi shape antenna |
| US9419337B2 (en) | 2014-01-15 | 2016-08-16 | Wistron Neweb Corporation | Wireless communication device |
| CN106559040A (en) * | 2015-09-25 | 2017-04-05 | 苏州普源精电科技有限公司 | The poor orthogonal phase splitter of calibration phase of output signal, modulator/demodulator and its method |
| CN107275790A (en) * | 2016-04-08 | 2017-10-20 | 现代自动车株式会社 | Antenna assembly, the method for controlling antenna assembly and the vehicle with antenna assembly |
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- 2009-06-25 CN CN2009200285763U patent/CN201590488U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104681984B (en) * | 2013-11-29 | 2019-05-21 | 深圳富泰宏精密工业有限公司 | Wireless communication device |
| CN104681984A (en) * | 2013-11-29 | 2015-06-03 | 深圳富泰宏精密工业有限公司 | Wireless communication device |
| US9419337B2 (en) | 2014-01-15 | 2016-08-16 | Wistron Neweb Corporation | Wireless communication device |
| CN103928758A (en) * | 2014-03-19 | 2014-07-16 | 深圳市创荣发电子有限公司 | Antenna structure of wireless product |
| CN106663858B (en) * | 2014-05-09 | 2019-04-12 | 华为技术有限公司 | Changeable π shape antenna |
| WO2015169221A1 (en) * | 2014-05-09 | 2015-11-12 | Huawei Technologies Co., Ltd. | Switchable pi shape antenna |
| CN106663858A (en) * | 2014-05-09 | 2017-05-10 | 华为技术有限公司 | Switchable pi shape antenna |
| US9774083B2 (en) | 2014-05-09 | 2017-09-26 | Futurewei Technologies, Inc. | Switchable Pi shape antenna |
| US9184494B1 (en) | 2014-05-09 | 2015-11-10 | Futurewei Technologies, Inc. | Switchable Pi shape antenna |
| WO2016086593A1 (en) * | 2014-12-01 | 2016-06-09 | 捷开通讯(深圳)有限公司 | Mobile terminal switching antenna and switching method therefor |
| CN104518812A (en) * | 2014-12-01 | 2015-04-15 | 惠州Tcl移动通信有限公司 | Mobile terminal switching antenna and switching method thereof |
| CN106559040A (en) * | 2015-09-25 | 2017-04-05 | 苏州普源精电科技有限公司 | The poor orthogonal phase splitter of calibration phase of output signal, modulator/demodulator and its method |
| CN107275790A (en) * | 2016-04-08 | 2017-10-20 | 现代自动车株式会社 | Antenna assembly, the method for controlling antenna assembly and the vehicle with antenna assembly |
| CN112859983A (en) * | 2021-01-06 | 2021-05-28 | 深圳市紫光同创电子有限公司 | Power supply regulating circuit and method of chip |
| CN112859983B (en) * | 2021-01-06 | 2022-04-12 | 深圳市紫光同创电子有限公司 | Power supply regulating circuit and method of chip |
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Granted publication date: 20100922 Termination date: 20130625 |