CN101312354A - Aerial matching circuit and aerial matching method - Google Patents
Aerial matching circuit and aerial matching method Download PDFInfo
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- CN101312354A CN101312354A CNA2008101140899A CN200810114089A CN101312354A CN 101312354 A CN101312354 A CN 101312354A CN A2008101140899 A CNA2008101140899 A CN A2008101140899A CN 200810114089 A CN200810114089 A CN 200810114089A CN 101312354 A CN101312354 A CN 101312354A
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Abstract
The invention discloses an antenna matching circuit and an antenna matching method, which is capable of matching with an antenna better and enabling the antenna to receive radio frequency signals better. The antenna matching circuit is connected between the antenna and a tuner and matches with the antenna, which comprises a control circuit and a parameter regulating circuit, wherein the control circuit is connected with the parameter regulating circuit and the tuner and provides control signals to the parameter regulating circuit according to working frequency of the tuner, the parameter regulating circuit is connected with the antenna, the tuner and the control circuit respectively and regulates matching parameters under the action of control signals to vary the working frequency of the antenna matching circuit and to complete matching of the antenna. By regulating the matching parameters of the antenna matching circuit, the antenna matching circuit and the antenna matching method can match the receiving capacity of the antenna to the optimum and effectively reduce the antenna standing wave ratio.
Description
Technical field
The present invention relates to wireless communication field, specifically, relate to a kind of antenna-matching circuit and a kind of aerial matching method.
Background technology
The effect of antenna-matching circuit is by antenna being carried out the coupling of impedance etc., guarantee the energy that reception antenna receives, can being transferred to the back one-level to greatest extent and handling.If the matching effect of antenna-matching circuit and antenna is bad to be mismatch, at transmitting terminal, the signal that is sent to antenna will be reflected back toward transmitter, produces reflected wave in feeder line so, reflected wave arrival transmitter finally can be converted into heat exhaustion and fall, and can burn out the power amplifier of transmitter when serious; At receiving terminal, it is bad also can to cause that signal receives because of mismatch, also is that the receptivity of antenna is weakened, and the performance of whole system is caused deterioration.Standing-wave ratio is a parameter commonly used that characterizes matching performance, and the low more expression matching performance of standing wave ratio is good more, and standing wave ratio is high more, and the expression matching performance is poor more.
Fig. 1 shows a kind of antenna-matching circuit 110 of the prior art, is connected between antenna 120 and the tuner 130.As shown in Figure 1, antenna-matching circuit 110 comprises capacitor C and inductance L, and wherein inductance C is a polarity free capacitor, and two ends connect antenna 120 and tuner 130 respectively, two ends one end of inductance L is connected the contact of antenna 120 and antenna-matching circuit 110, other end ground connection (GND).In a definite frequency range, by regulating the parameter value of each element in the antenna-matching circuit 110, determine the match parameter of antenna-matching circuit 110, realize that antenna-matching circuit 110 and antenna 120 are complementary, and improve the receptivity of antenna 120.
Present antenna-matching circuit all is directly to mate in needed whole frequency, so just can only be centre frequency with whole frequency as the reference point, carry out the design of antenna-matching circuit.Though near the centre frequency of whole frequency, obtain matching effect relatively preferably, the height two ends of frequency range, matching effect is very poor, makes the performance of system be greatly affected.
With China Mobile's DMB (China Mobile Multimedia Broadcasting, be abbreviated as CMMB) be example, CMMB is operated in whole hyperfrequency (Ultra High Frequency, be abbreviated as UHF) frequency range, be that 470Mhz is in the 862Mhz frequency range, in the wide bandwidth that reaches 392Mhz of frequency span, to accomplish antenna match good in the whole bandwidth according to prior art, be a very difficult impossible in other words thing.Fig. 2 is that CMMB arrives 862Mhz frequency range standing internal wave than a schematic diagram with frequency change, the center 666Mhz of the working point of antenna-matching circuit in frequency range at 470Mhz.As shown in Figure 2, abscissa is represented frequency, and unit is Mhz; Ordinate is represented standing-wave ratio, and near the frequency of 666Mhz, standing-wave ratio is 1.2, and the matching performance of antenna-matching circuit is very outstanding, but more near the frequency range two ends, matching performance is obviously poor more, and at 470Mhz and 862Mhz place, standing-wave ratio is 2.
Summary of the invention
Technical problem to be solved by this invention is to be a kind of antenna-matching circuit and method need be provided, and can carry out better matching to antenna, makes that antenna can better received RF signal.
In order to solve the problems of the technologies described above, the invention provides a kind of antenna-matching circuit, be connected between antenna and the tuner, antenna is mated, comprise control circuit and parameter adjustment circuit, wherein:
Described control circuit links to each other with tuner with described parameter adjustment circuit, provides control signal according to the operating frequency of described tuner for described parameter adjustment circuit;
Described parameter adjustment circuit links to each other with described antenna, tuner and control circuit respectively, under described control signal effect, regulates match parameter, thereby changes the operating frequency of described antenna-matching circuit, finishes the coupling to described antenna 320.
In the aforesaid antenna-matching circuit, described control circuit can comprise bias-voltage generating circuit, and described parameter adjustment circuit comprises appearance value controlable electric current, wherein:
Described bias-voltage generating circuit links to each other with described tuner and appearance value controlable electric current, provides bias voltage according to the operating frequency of described tuner for described appearance value controlable electric current;
Described appearance value controlable electric current, link to each other with described antenna, tuner and bias-voltage generating circuit, under described bias voltage effect, regulate the appearance value of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
Further, described bias-voltage generating circuit can comprise microprocessor and integrating circuit, wherein:
Described microprocessor links to each other with described tuner, and the working frequency range of described antenna-matching circuit is divided into the experimental process frequency range, and gives described integrating circuit according to the operating frequency output control signal of described tuner;
Described integrating circuit, link to each other with described microprocessor and appearance value controlable electric current, produce bias voltage according to described control signal and export to described appearance value controlable electric current, regulate the appearance value of described appearance value controlable electric current, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
Further, described microprocessor may further include the bias voltage memory, the operating frequency of the described antenna-matching circuit of described bias voltage memory stores and the corresponding relation of bias voltage; Described microprocessor is determined the pairing bias voltage of operating frequency of described tuner according to the operating frequency of described tuner by searching described bias voltage memory.
In addition, described appearance value controlable electric current can comprise electric capacity, inductance and variable capacitance diode, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable capacitance diode, negative pole connect the contact and the described bias-voltage generating circuit of described electric capacity and antenna or tuner, plus earth;
Described variable capacitance diode under described bias voltage effect and described electric capacity and inductance cooperate, the appearance value of regulating described antenna-matching circuit.
And described appearance value controlable electric current can comprise electric capacity, inductance and variable capacitance diode, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described inductance is connected in series described inductance with described variable capacitance diode, one end connects the contact of described electric capacity and antenna or tuner, and the other end connects the negative pole of described variable capacitance diode, described variable capacitance diode, negative pole connects described inductance and bias-voltage generating circuit, plus earth; Perhaps
Described inductance one end connects the positive pole of described variable capacitance diode, other end ground connection; Described variable capacitance diode negative pole connects described inductance and bias-voltage generating circuit;
Described variable capacitance diode is under the described bias voltage effect and under described electric capacity and inductance cooperate, the appearance value of regulating described antenna-matching circuit.
In the aforesaid antenna-matching circuit, described control circuit can comprise ON-OFF control circuit, and described parameter adjustment circuit comprises sense value controlable electric current, wherein:
Described ON-OFF control circuit links to each other with tuner with described sense value controlable electric current, provides switching signal according to the operating frequency of described tuner for described sense value controlable electric current;
Described sense value controlable electric current, link to each other with described antenna, tuner and ON-OFF control circuit respectively, under described switching signal effect, regulate the sense value of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
Further, described ON-OFF control circuit can comprise microprocessor and switch matrix, wherein:
Described microprocessor links to each other with described tuner, and the working frequency range of described antenna-matching circuit is divided into the experimental process frequency range, and gives described switch matrix according to the operating frequency output switch control signal of described tuner;
Described switch matrix, link to each other with described microprocessor and sense value controlable electric current, produce switching signal according to described switch controlling signal and export to described sense value controlable electric current, regulate the sense value of described sense value controlable electric current, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
And described microprocessor may further include the switching signal memory, the operating frequency of the described antenna-matching circuit of described switching signal memory stores and the corresponding relation of switching signal; Described microprocessor is determined the pairing switching signal of operating frequency of described tuner according to the operating frequency of described tuner by searching described switching signal memory.
Further, described sense value controlable electric current can comprise electric capacity, first inductance and variable inductance, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described first inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable inductance under described switching signal effect and described electric capacity and first inductance cooperate, the sense value of regulating described antenna-matching circuit.
And described sense value controlable electric current can comprise electric capacity, first inductance and variable inductance, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described first inductance, be connected in series with described variable inductance, described first inductance, one end connects the contact of described electric capacity and described antenna or tuner, and the other end connects described variable inductance, described variable inductance one end connects described first inductance and described ON-OFF control circuit, other end ground connection; Perhaps described first inductance, one end connects described variable inductance, other end ground connection, and described variable inductance one end connects described first inductance, and the other end connects the contact and the described ON-OFF control circuit of described electric capacity and described antenna or tuner;
Described variable inductance under described switching signal effect and described electric capacity and first inductance cooperate, the sense value of regulating described antenna-matching circuit.
In addition, described integrating circuit is adjusted to the operating frequency of described antenna-matching circuit in the frequency sub-band under the operating frequency of described tuner, can comprise that operating frequency with described antenna-matching circuit is adjusted into the centre frequency of the frequency sub-band under the operating frequency of described tuner.
Further, described electric capacity can be polarity free capacitor.
The present invention and then a kind of aerial matching method is provided, being used for antenna-matching circuit mates the impedance of antenna, give tuner with the power transfer that antenna received, operating frequency according to described tuner, regulate the match parameter of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
Aforesaid aerial matching method can be divided into step:
The working frequency range of antenna-matching circuit is divided into the experimental process frequency range;
Determine the affiliated frequency sub-band of operating frequency of described tuner;
By changing the match parameter of described antenna-matching circuit, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
Further, the match parameter of described antenna-matching circuit can comprise the appearance value and/or the sense value of antenna-matching circuit.
Further, the operating frequency of described antenna-matching circuit is adjusted into the step in the frequency sub-band under the operating frequency of described tuner, can comprises that operating frequency with described antenna-matching circuit is adjusted into the centre frequency of the frequency sub-band under the operating frequency of described tuner.
Compared with prior art, the present invention is by adjusting the match parameter of antenna-matching circuit, and the receiving ability of antenna is matched the best, effectively reduces antenna standing wave ratio.
Description of drawings
Fig. 1 is a kind of antenna-matching circuit schematic diagram of the prior art.
Fig. 2 is that 470Mhz is to the schematic diagram of 862Mhz frequency range standing internal wave ratio with frequency change.
Fig. 3 is the schematic diagram of antenna-matching circuit of the present invention.
Fig. 4 is the antenna-matching circuit first embodiment schematic diagram of the present invention.
Fig. 5 is the application example schematic diagram of antenna-matching circuit first embodiment of the present invention.
Fig. 6 is the Another application example schematic of antenna-matching circuit first embodiment of the present invention.
Fig. 7 is the antenna-matching circuit second embodiment schematic diagram of the present invention.
Fig. 8 is the application example schematic diagram of antenna-matching circuit second embodiment of the present invention.
Fig. 9 is the Another application example schematic of antenna-matching circuit second embodiment of the present invention.
Figure 10 is an aerial matching method embodiment flow chart of the present invention.
Figure 11 is that aerial matching method of the present invention compares with the frequency change schematic diagram at each frequency sub-band standing internal wave.
Figure 12 is an aerial matching method application example flow chart of the present invention.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.
Fig. 3 is the schematic diagram of antenna-matching circuit of the present invention.As shown in Figure 3, antenna-matching circuit 310 of the present invention comprises control circuit 311 and parameter adjustment circuit 312, wherein:
Consider to adjust the match parameter of antenna-matching circuit by adjusting the appearance value of electric capacity in the antenna-matching circuit, Fig. 4 shows antenna-matching circuit first embodiment of the present invention.As shown in Figure 4, antenna-matching circuit 410 comprises bias-voltage generating circuit 411 and appearance value controlable electric current 412 in the present embodiment, wherein:
Bias-voltage generating circuit 411 links to each other with tuner 430 with appearance value controlable electric current 412, provides bias voltage according to the operating frequency of tuner 430 for appearance value controlable electric current 412;
Appearance value controlable electric current 412, link to each other with antenna 420, tuner 430 and bias-voltage generating circuit 411 respectively, under the bias voltage effect that bias-voltage generating circuit 411 is provided, regulate the value of appearance over the ground of antenna-matching circuit 410, thereby change the operating frequency of antenna-matching circuit 410, finish coupling, reduce standing-wave ratio, improve the signal receiving performance of antenna 420 antenna 420.
Fig. 5 shows the application example of antenna-matching circuit first embodiment of the present invention, and as shown in Figure 5, bias-voltage generating circuit 411 shown in Figure 4 comprises microprocessor 491 and integrating circuit 492, wherein:
Integrating circuit 492, link to each other with appearance value controlable electric current 412 shown in Figure 4 with microprocessor 491, integral control signal according to microprocessor 491 outputs produces bias voltage, export to appearance value controlable electric current 412, regulate the value of appearance over the ground of appearance value controlable electric current 412, the operating frequency of antenna-matching circuit 410 is adjusted in the frequency sub-band under the operating frequency of tuner 430, preferably the operating frequency of antenna-matching circuit 410 is adjusted into the centre frequency of the frequency sub-band under the operating frequency of tuner 430.
By the output voltage of control integrating circuit 492, change the value of appearance over the ground of antenna-matching circuit 410, thereby change the operating frequency of entire antenna match circuit 410, obtain antenna 420 needed match parameter.
Microprocessor shown in Figure 5, can also store the operating frequency of antenna-matching circuit 410 and the corresponding relation of bias voltage by a bias voltage memory, when tuner 430 is worked in the wideband section, the centre frequency of each frequency sub-band as the operating frequency of antenna-matching circuit 410 corresponding to each frequency sub-band, is stored in the form of the pairing bias voltage of the centre frequency of each frequency sub-band with the bias voltage table in the bias voltage memory in advance.When the user selectes a certain channel, microprocessor 491 is according to the operating frequency of tuner 430, determine the pairing bias voltage of operating frequency of tuner 430 by searching the bias voltage table, and then by these bias voltages of integrating circuit 492 output to appearance value controlable electric current 412, appearance value controlable electric current 412 is adjusted the appearance value of self according to this bias voltage, thereby realizes the coupling of antenna-matching circuit 410 and antenna 420.
Continuation is referring to Fig. 5, and appearance value controlable electric current 412 shown in Figure 4 comprises capacitor C 4, inductance L 41 and variable capacitance diode D4, wherein:
Capacitor C 4 is polarity free capacitor, and two ends connect antenna 420 and tuner 430 respectively, with the contact of antenna 420 be a, with the contact of tuner 430 be b;
Inductance L 41, one ends connect contact a, other end ground connection;
Variable capacitance diode D4, negative pole connects contact b, plus earth;
Perhaps exchanging the position of inductance L 41 and variable capacitance diode D4, also is that inductance L 41 1 ends connect contact b, other end ground connection; The negative pole of variable capacitance diode D4 connects contact a, plus earth.And, be connected in inductance L 41 and variable capacitance diode D4 the same side of capacitor C 4 in parallel, also be feasible.Such as, with an end of inductance L 41 and the negative pole of variable capacitance diode D4, all be connected contact a (perhaps contact b), the plus earth of the other end of inductance L 41 and variable capacitance diode D4.
Under the bias voltage effect that integrating circuit 492 is provided, by adjusting the appearance value of variable capacitance diode D4, and under the cooperation of capacitor C 4 and inductance L 41, the operating frequency of antenna-matching circuit 410 is adjusted in the frequency sub-band under the operating frequency of tuner 430, finish coupling to antenna 420.Integrating circuit 492 connects contact b, and variable capacitance diode D4 changes the value of appearance over the ground of appearance value controlable electric current 312 by the appearance value that changes self under the bias voltage effect that integrating circuit 492 is exported, realize the coupling of 410 pairs of antennas 420 of antenna-matching circuit.
Comprise variable capacitance diode D4 in the antenna-matching circuit 410, the wideband section of large span is divided into the experimental process frequency range, by changing the appearance value of variable capacitance diode D4, carries out the coupling of antenna 420 in the frequency sub-band under the operating frequency of realization tuner like this.In the frequency sub-band of each little span, antenna 420 can obtain reasonable standing-wave ratio like this, and the energy that receives from antenna 420 can enter into tuner 430 to greatest extent.
Fig. 6 shows the Another application example of antenna-matching circuit first embodiment of the present invention.Application example shown in Figure 6 is compared with application example shown in Figure 5, difference is that variable capacitance diode D4 is connected between inductance L 41 and the ground, and negative pole connects inductance L 41 and integrating circuit 492, plus earth, variable capacitance diode D4 and inductance L 41 form and are connected in series.All the other components and parts annexations in the application example shown in Figure 6, and the function of each components and parts is all identical with application example shown in Figure 5.In fact, exchanging the position of inductance L 41 and variable capacitance diode D4, is feasible equally, also is inductance L 41 1 end ground connection, the positive pole of another termination variable capacitance diode D4; The negative pole of variable capacitance diode D4 connects contact a and integrating circuit 492.In addition, inductance L 41 that is connected in series and variable capacitance diode D4 can also be connected between contact b and the ground, perhaps an end of inductance L 41 connects contact b, variable capacitance diode D4 plus earth, perhaps inductance L 41 1 end ground connection, the positive pole of variable capacitance diode D4 connects contact b.
By adjusting the sense value of inductance in the antenna-matching circuit, adjust the match parameter of antenna-matching circuit, Fig. 7 shows antenna-matching circuit second embodiment of the present invention.As shown in Figure 7, antenna-matching circuit 710 comprises ON-OFF control circuit 711 and sense value controlable electric current 712 in the present embodiment, wherein:
ON-OFF control circuit 711 links to each other with tuner 730 with sense value controlable electric current 712, provides switching signal according to the operating frequency of tuner 730 for sense value controlable electric current 412;
Sense value controlable electric current 712, link to each other with antenna 720, tuner 730 and ON-OFF control circuit 711 respectively, under the switching signal effect that ON-OFF control circuit 711 is provided, regulate the sense value over the ground of antenna-matching circuit 710, thereby change the operating frequency of antenna-matching circuit 710, finish coupling, reduce standing-wave ratio, improve the signal receiving performance of antenna 720 antenna 720.
Fig. 8 shows the application example of antenna-matching circuit second embodiment of the present invention, and as shown in Figure 8, ON-OFF control circuit 711 shown in Figure 7 comprises microprocessor 791 and switch matrix 792, wherein:
By the switching signal of control switch matrix 792, change the value of appearance over the ground of antenna-matching circuit 710, thereby change the operating frequency of entire antenna match circuit 710, obtain antenna 720 needed match parameter.
Microprocessor shown in Figure 8, also can store the corresponding relation of the operating frequency and the switching signal of antenna-matching circuit 710 by a switching signal memory, when tuner 730 is worked in the wideband section, the centre frequency of each frequency sub-band as the operating frequency of antenna-matching circuit 710 corresponding to each frequency sub-band, is stored in the form of the pairing switching signal of the centre frequency of each frequency sub-band with the switching signal table in the switching signal memory in advance.When the user selectes a certain channel, microprocessor 791 is according to the operating frequency of tuner 730, determine the pairing switching signal of operating frequency of tuner 730 by searching the switching signal table, the break-make of switch in the control switch matrix 792, adjust the sense value of sense value controlable electric current 712 with this, thereby realize the coupling of antenna-matching circuit 710 and antenna 720.
Continuation is referring to Fig. 8, and sense value controlable electric current 712 shown in Figure 7 comprises capacitor C 7, first inductance L 71 and variable inductance L79, wherein:
Capacitor C 7 is polarity free capacitor, and two ends connect antenna 720 and tuner 730 respectively, with the contact of antenna 720 be m, with the contact of tuner 730 be n;
First inductance L, 71, one ends connect contact m, other end ground connection;
Variable inductance L79, an end connects contact n, other end ground connection;
Perhaps exchange the position of first inductance L 71 and variable inductance L79, also promptly first inductance L, 71 1 ends connect contact n, other end ground connection; Variable inductance L79 one end connects contact m, other end ground connection.In addition, first inductance L 71 and variable inductance L79 being connected in parallel on the same side of capacitor C 7, also is feasible.For example, with an end of first inductance L 71 and the end of variable inductance L79, be connected contact m (perhaps contact n), the equal ground connection of the other end of the other end of first inductance L 71 and variable inductance L79.
Under the switching signal effect that switch matrix 792 is provided, by adjusting the sense value of variable inductance L79, and under the cooperation of the capacitor C 7 and first inductance L 71, the operating frequency of antenna-matching circuit 710 is adjusted in the frequency sub-band under the operating frequency of tuner 730, finished coupling antenna 720.Switch matrix 792 connects contact n, and variable inductance L79 changes the sense value over the ground of sense value controlable electric current 712 by the sense value that changes self under the switching signal effect that switch matrix 792 is exported, realize the coupling of 710 pairs of antennas 720 of antenna-matching circuit.
Comprise variable inductance L79 in the antenna-matching circuit 710, the wideband section of large span is divided into the experimental process frequency range, by changing the sense value of variable inductance L79, carries out the coupling of antenna 720 in the frequency sub-band under the operating frequency of realization tuner like this.In the frequency sub-band of each little span, antenna 720 can obtain reasonable standing-wave ratio like this, and the energy that receives from antenna 720 can enter into tuner 730 to greatest extent.
Fig. 9 shows the Another application example of antenna-matching circuit second embodiment of the present invention.Application example shown in Figure 9 is compared with application example shown in Figure 8, and difference is that variable inductance L79 is connected between first inductance L 71 and the ground, and the variable inductance L79 and first inductance L 71 form and be connected in series.All the other components and parts annexations in the application example shown in Figure 9, and the function of each components and parts is all identical with application example shown in Figure 8.In fact, exchanging the position of first inductance L 71 and variable inductance L79, is feasible equally, also is first inductance L, 71 1 end ground connection, another termination variable inductance L79, and the variable inductance L79 other end connects contact m.In addition, first inductance L 71 and the variable inductance L79 that are connected in series can also be connected between contact n and the ground, and perhaps first inductance L 71 connects contact n, variable inductance L79 ground connection, and perhaps first inductance L, 71 ground connection, variable inductance L79 connects contact n.
Two embodiment of aforementioned antenna-matching circuit of the present invention, be respectively value of appearance over the ground or sense value over the ground from independent adjustment antenna-matching circuit, but in actual applications, can also start with from value of appearance over the ground and the sense value over the ground of adjusting antenna-matching circuit simultaneously, make antenna-matching circuit and antenna match.
Aerial matching method of the present invention is regulated the value of appearance over the ground of antenna-matching circuit according to the operating frequency of tuner, thereby changes the operating frequency of antenna-matching circuit, finishes the coupling to antenna, reduces standing-wave ratio, improves the signal receiving performance of antenna.Figure 10 shows a kind of implementation of aerial matching method of the present invention, comprises the steps:
Step S10 is divided into the experimental process frequency range with the working frequency range of antenna-matching circuit;
Step S20 determines the frequency sub-band under the operating frequency of tuner;
Step S30 by changing the match parameter of antenna-matching circuit, adjusts to the operating frequency of antenna-matching circuit in the frequency sub-band under the operating frequency of tuner, finishes the coupling to antenna.
Among the step S30, preferably the operating frequency of antenna-matching circuit is adjusted into the centre frequency of the frequency sub-band under the operating frequency of tuner.
Adjusting the match parameter of antenna-matching circuit among the step S30, can be the appearance value of adjusting antenna-matching circuit separately, also can be the sense value of adjusting antenna-matching circuit separately, certainly, can also be appearance value and the sense value of adjusting antenna-matching circuit simultaneously.
Aerial matching method of the present invention is divided into the wideband section of whole large span the frequency sub-band of several little spans, in the described frequency sub-band of the operating frequency of tuner, carry out the coupling of antenna again, even if the operating frequency of tuner is positioned near certain frequency sub-band distance center frequency end points far away like this, the match point of antenna-matching circuit is in the wideband section of whole large span, also still nearer apart from the operating frequency of tuner, can mate antenna well.Therefore, the wideband section of large span is divided into after the experimental process frequency range, can effectively reduces the standing-wave ratio of antenna, the energy that receives from antenna can import into the tuner to greatest extent.
Figure 11 shows aerial matching method of the present invention and the wideband section of large span is divided into after the frequency sub-band of k little span, and than the schematic diagram with frequency change, abscissa is represented frequency at each frequency sub-band standing internal wave, and unit is hz; Ordinate is represented standing-wave ratio, is example with first frequency sub-band n0hz in the frequency range of n1hz, locates at the centre frequency n1 ' of first frequency sub-band, and standing wave ratio is 1.2, and at end points frequency n0 and n1 place, standing wave ratio is 1.4.
Figure 12 shows an application example of aerial matching method of the present invention, comprises the steps:
Step T10 is the frequency range of 470Mhz to 862Mhz with the working frequency range of CMMB, is divided into 49 frequency sub-band, and the bandwidth of each frequency sub-band is 8Mhz;
Step T20, the operating frequency of determining tuner is 546Mhz;
Step T30 determines that the frequency sub-band under the frequency 546Mhz is that 542Mhz is to 550Mhz;
Step T40 by changing the value of appearance over the ground of antenna-matching circuit, is adjusted into the centre frequency 546Mhz of 542Mhz to 550Mhz with the operating frequency of antenna-matching circuit.
Because the operating frequency 546Mhz of antenna-matching circuit, so the matching effect of antenna-matching circuit is very desirable, than prior art the operating frequency of antenna-matching circuit is arranged on 666Mhz and compares, and matching effect has obtained obvious improvement, and standing-wave ratio obviously descends.
In the aerial matching method of the present invention, realize the coupling of antenna-matching circuit and antenna by changing capacitance, the corresponding relation of the bias voltage that antenna-matching circuit operating frequency and control capacitance value can also be changed is stored in the microprocessor, when tuner is worked in the wideband section, with the centre frequency of each frequency sub-band as the operating frequency of antenna-matching circuit corresponding to each frequency range, store the pairing bias value of centre frequency of each frequency sub-band in advance, form an antenna-matching circuit operating frequency and the corresponding bias voltage table of bias voltage.When the user selectes a certain channel, microprocessor is determined the pairing bias voltage of tuner operating frequency by searching inner bias voltage table, and then export this bias voltage to appearance value controlable electric current by integrating circuit, appearance value controlable electric current is adjusted the appearance value of self according to this bias voltage, thereby realizes the coupling of antenna-matching circuit and antenna.
In the aerial matching method of the present invention, by changing the coupling that inductance value realizes antenna-matching circuit and antenna, the corresponding relation of the switching signal that antenna-matching circuit operating frequency and control inductance value can also be changed is stored in the microprocessor, when tuner is worked in the wideband section, with the centre frequency of each frequency sub-band as the operating frequency of antenna-matching circuit corresponding to each frequency range, store the pairing switching signal of centre frequency of each frequency sub-band in advance, form an antenna-matching circuit operating frequency and the corresponding switching signal table of switching signal.When the user selectes a certain channel, microprocessor is according to the operating frequency of tuner, determine the pairing switching signal of tuner operating frequency by searching the switch inside signal list, and then export this switching signal to sense value controlable electric current by integrating circuit, sense value controlable electric current is adjusted the sense value of self according to this switching signal, thereby realizes the coupling of antenna-matching circuit and antenna.
Though the disclosed execution mode of the present invention as above, the execution mode that described content just adopts for the ease of understanding the present invention is not in order to limit the present invention.Technical staff in any the technical field of the invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can do any modification and variation what implement in form and on the details; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (17)
1, a kind of antenna-matching circuit is connected between antenna and the tuner, and antenna is mated, and it is characterized in that, comprises control circuit and parameter adjustment circuit, wherein:
Described control circuit links to each other with tuner with described parameter adjustment circuit, provides control signal according to the operating frequency of described tuner for described parameter adjustment circuit;
Described parameter adjustment circuit links to each other with described antenna, tuner and control circuit respectively, under described control signal effect, regulates match parameter, thereby changes the operating frequency of described antenna-matching circuit, finishes the coupling to described antenna.
2, antenna-matching circuit as claimed in claim 1 is characterized in that, described control circuit comprises bias-voltage generating circuit, and described parameter adjustment circuit comprises appearance value controlable electric current, wherein:
Described bias-voltage generating circuit links to each other with described tuner and appearance value controlable electric current, provides bias voltage according to the operating frequency of described tuner for described appearance value controlable electric current;
Described appearance value controlable electric current, link to each other with described antenna, tuner and bias-voltage generating circuit, under described bias voltage effect, regulate the appearance value of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
3, antenna-matching circuit as claimed in claim 2 is characterized in that, described bias-voltage generating circuit comprises microprocessor and integrating circuit, wherein:
Described microprocessor links to each other with described tuner, and the working frequency range of described antenna-matching circuit is divided into the experimental process frequency range, and gives described integrating circuit according to the operating frequency output control signal of described tuner;
Described integrating circuit, link to each other with described microprocessor and appearance value controlable electric current, produce bias voltage according to described control signal and export to described appearance value controlable electric current, regulate the appearance value of described appearance value controlable electric current, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
4, antenna-matching circuit as claimed in claim 3 is characterized in that, described microprocessor further comprises the bias voltage memory, the operating frequency of the described antenna-matching circuit of described bias voltage memory stores and the corresponding relation of bias voltage; Described microprocessor is determined the pairing bias voltage of operating frequency of described tuner according to the operating frequency of described tuner by searching described bias voltage memory.
5, antenna-matching circuit as claimed in claim 2 is characterized in that, described appearance value controlable electric current comprises electric capacity, inductance and variable capacitance diode, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable capacitance diode, negative pole connect the contact and the described bias-voltage generating circuit of described electric capacity and antenna or tuner, plus earth;
Described variable capacitance diode under described bias voltage effect and described electric capacity and inductance cooperate, the appearance value of regulating described antenna-matching circuit.
6, antenna-matching circuit as claimed in claim 2 is characterized in that, described appearance value controlable electric current comprises electric capacity, inductance and variable capacitance diode, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described inductance is connected in series described inductance with described variable capacitance diode, one end connects the contact of described electric capacity and antenna or tuner, and the other end connects the negative pole of described variable capacitance diode, described variable capacitance diode, negative pole connects described inductance and bias-voltage generating circuit, plus earth; Perhaps
Described inductance one end connects the positive pole of described variable capacitance diode, other end ground connection; Described variable capacitance diode negative pole connects described inductance and bias-voltage generating circuit;
Described variable capacitance diode is under the described bias voltage effect and under described electric capacity and inductance cooperate, the appearance value of regulating described antenna-matching circuit.
7, antenna-matching circuit as claimed in claim 1 is characterized in that, described control circuit comprises ON-OFF control circuit, and described parameter adjustment circuit comprises sense value controlable electric current, wherein:
Described ON-OFF control circuit links to each other with tuner with described sense value controlable electric current, provides switching signal according to the operating frequency of described tuner for described sense value controlable electric current;
Described sense value controlable electric current, link to each other with described antenna, tuner and ON-OFF control circuit respectively, under described switching signal effect, regulate the sense value of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
8, antenna-matching circuit as claimed in claim 7 is characterized in that, described ON-OFF control circuit comprises microprocessor and switch matrix, wherein:
Described microprocessor links to each other with described tuner, and the working frequency range of described antenna-matching circuit is divided into the experimental process frequency range, and gives described switch matrix according to the operating frequency output switch control signal of described tuner;
Described switch matrix, link to each other with described microprocessor and sense value controlable electric current, produce switching signal according to described switch controlling signal and export to described sense value controlable electric current, regulate the sense value of described sense value controlable electric current, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
9, antenna-matching circuit as claimed in claim 7 is characterized in that, described microprocessor further comprises the switching signal memory, the operating frequency of the described antenna-matching circuit of described switching signal memory stores and the corresponding relation of switching signal; Described microprocessor is determined the pairing switching signal of operating frequency of described tuner according to the operating frequency of described tuner by searching described switching signal memory.
10, antenna-matching circuit as claimed in claim 9 is characterized in that, described sense value controlable electric current comprises electric capacity, first inductance and variable inductance, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described first inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable inductance, an end connects the contact of described electric capacity and antenna or tuner, other end ground connection;
Described variable inductance under described switching signal effect and described electric capacity and first inductance cooperate, the sense value of regulating described antenna-matching circuit.
11, antenna-matching circuit as claimed in claim 9 is characterized in that, described sense value controlable electric current comprises electric capacity, first inductance and variable inductance, wherein:
Described electric capacity, two ends connect described antenna and tuner respectively;
Described first inductance, be connected in series with described variable inductance, described first inductance, one end connects the contact of described electric capacity and described antenna or tuner, and the other end connects described variable inductance, described variable inductance one end connects described first inductance and described ON-OFF control circuit, other end ground connection; Perhaps described first inductance, one end connects described variable inductance, other end ground connection, and described variable inductance one end connects described first inductance, and the other end connects the contact and the described ON-OFF control circuit of described electric capacity and described antenna or tuner;
Described variable inductance under described switching signal effect and described electric capacity and first inductance cooperate, the sense value of regulating described antenna-matching circuit.
12, as claim 3 or 8 described antenna-matching circuits, it is characterized in that, described integrating circuit is adjusted to the operating frequency of described antenna-matching circuit in the frequency sub-band under the operating frequency of described tuner, comprises that operating frequency with described antenna-matching circuit is adjusted into the centre frequency of the frequency sub-band under the operating frequency of described tuner.
As claim 5,6,10 or 11 described antenna-matching circuits, it is characterized in that 13, described electric capacity is polarity free capacitor.
14, a kind of aerial matching method, being used for antenna-matching circuit mates the impedance of antenna, give tuner with the power transfer that antenna received, it is characterized in that, operating frequency according to described tuner, regulate the match parameter of described antenna-matching circuit, thereby change the operating frequency of described antenna-matching circuit, finish coupling described antenna.
15, aerial matching method as claimed in claim 14 is characterized in that, this method is divided into step:
The working frequency range of antenna-matching circuit is divided into the experimental process frequency range;
Determine the affiliated frequency sub-band of operating frequency of described tuner;
By changing the match parameter of described antenna-matching circuit, the operating frequency of described antenna-matching circuit is adjusted in the frequency sub-band under the operating frequency of described tuner.
As claim 14 or 15 described aerial matching methods, it is characterized in that 16, the match parameter of described antenna-matching circuit comprises the appearance value and/or the sense value of antenna-matching circuit.
17, aerial matching method as claimed in claim 15, it is characterized in that, the operating frequency of described antenna-matching circuit is adjusted into the step in the frequency sub-band under the operating frequency of described tuner, comprises that operating frequency with described antenna-matching circuit is adjusted into the centre frequency of the frequency sub-band under the operating frequency of described tuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101140899A CN101312354A (en) | 2008-05-30 | 2008-05-30 | Aerial matching circuit and aerial matching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101140899A CN101312354A (en) | 2008-05-30 | 2008-05-30 | Aerial matching circuit and aerial matching method |
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| CN101312354A true CN101312354A (en) | 2008-11-26 |
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| CNA2008101140899A Pending CN101312354A (en) | 2008-05-30 | 2008-05-30 | Aerial matching circuit and aerial matching method |
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