CN103928769B - Aerial matching method, circuit and electronic equipment - Google Patents
Aerial matching method, circuit and electronic equipment Download PDFInfo
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- CN103928769B CN103928769B CN201410114761.XA CN201410114761A CN103928769B CN 103928769 B CN103928769 B CN 103928769B CN 201410114761 A CN201410114761 A CN 201410114761A CN 103928769 B CN103928769 B CN 103928769B
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Abstract
The invention discloses a kind of aerial matching method, circuit and electronic equipment, described method comprises: in the first frequency range control switch cell conduction second capacitive unit or conducting inductive unit; Control described first capacitive unit and change the capacitance self presented, to make the unit of described first capacitive unit and the conducting of described switch element institute, impedance matching is carried out to described antenna element; Wherein, described first frequency range is the frequency range that the resonance frequency departing from antenna element does not exceed first threshold; The unit that described switch element switches institute's conducting is controlled in the second frequency range; The unit controlling described first capacitive unit and described switch element institute switched conductive carries out impedance matching to described antenna element; Wherein, described second frequency range is that the resonance frequency departing from described antenna element exceedes described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.By the present invention, when antenna element works in broadband, ensure that the performance of antenna element.
Description
Technical field
The present invention relates to the communication technology, particularly relate to a kind of aerial matching method, circuit and electronic equipment.
Background technology
At present, the structure of the mobile terminals such as mobile phone becomes increasingly complex, and the space leaving antenna for is more and more less.The space of antenna is little means that the bandwidth of antenna can narrow.Meanwhile, in actual use, owing to will cover multiple different communication standard, antenna often needs to cover multiple frequency range.The general low-frequency range of current antenna needs covering 824 ~ 960 megahertz (MHz), and high band needs covering 1710 ~ 2170MHz.And come into the market fast along with Long Term Evolution (LTE, LongTermEvolution), antenna also needs to cover LTE frequency range.In LTE frequency range, frequency band is minimum to 698MHz.This just means that antenna low-frequency range needs covering 698 ~ 960MHz frequency range, and under the steric requirements that current antenna can utilize, correlation technique is difficult to cover such wide-band.The solution generally adopted at present adopts switching device or adjustable device (as tunable capacitor) to regulate antenna, utilizes the multiple state of antenna to go to realize a wide band covering.
Because the adjustable extent of the tunable capacitor of non-switch type is usually all very limited, if increase the electric capacity regulating ratio of tunable capacitor or adopt switch to regulate, when frequency departure original resonance frequency is larger, the numerical value (absolute value) of the return loss of antenna can obviously reduce, and have impact on the performance of antenna.
Summary of the invention
The embodiment of the present invention provides a kind of aerial matching method, circuit and electronic equipment, when antenna element works in broadband, ensures the performance of antenna element.
The technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of aerial matching method, be applied in the electronic equipment with antenna element and radio frequency unit, described electronic equipment also comprises antenna matching unit, and described antenna matching unit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described first capacitive unit is connected with described antenna element, and the second terminal of described first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
Second terminal of described switch element is connected with the first terminal of described second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit, described inductive unit, described switch element supports a unit in the second capacitive unit described in conducting and described inductive unit;
Described method comprises:
Inductive unit described in the second capacitive unit described in described switching means conductive or conducting is controlled in the first frequency range;
Control the unit of described first capacitive unit and the conducting of described switch element institute in described first frequency range, impedance matching is carried out to described antenna element; Wherein, described first frequency range is the frequency range that the resonance frequency departing from described antenna element does not exceed first threshold;
The unit that described switch element switches institute's conducting is controlled in the second frequency range;
The unit controlling described first capacitive unit and described switch element institute switched conductive in described second frequency range carries out impedance matching to described antenna element; Wherein,
Described second frequency range is that the resonance frequency departing from described antenna element exceedes described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
The embodiment of the present invention also provides a kind of antenna-matching circuit, and be applied in the electronic equipment with antenna element and radio frequency unit, described antenna-matching circuit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described first capacitive unit is connected with described antenna element, and the second terminal of described first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
Second terminal of described switch element is connected with the first terminal of described second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit, described inductive unit, described switch element supports a unit in the second capacitive unit described in conducting and described inductive unit;
Described antenna-matching circuit also comprises:
Control unit, for controlling inductive unit described in the second capacitive unit described in described switching means conductive or conducting in the first frequency range;
Control the unit of described first capacitive unit and the conducting of described switch element institute in described first frequency range, impedance matching is carried out to described antenna element; Wherein, described first frequency range is the frequency range that the resonance frequency departing from described antenna element does not exceed first threshold;
Described control unit, also switches the unit of institute's conducting for controlling described switch element in the second frequency range;
The unit controlling described first capacitive unit and described switch element institute switched conductive in described second frequency range carries out impedance matching to described antenna element; Wherein,
Described second frequency range is that the resonance frequency departing from described antenna element exceedes described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
The embodiment of the present invention also provides a kind of electronic equipment, and described electronic equipment comprises above-described antenna-matching circuit.
In the present embodiment, departing from the frequency range of antenna element resonance frequency comparatively large (between first threshold and Second Threshold), by switching in the unit (the second capacitive unit or inductive unit) of the heterogeneity impedance that the first frequency range uses, the input impedance of antenna element is mated, guarantee that the return loss numerical value (absolute value) of antenna element can not obviously reduce, ensure that the performance of antenna element.
Accompanying drawing explanation
Fig. 1 a is the structural representation of electronic equipment in the embodiment of the present invention one;
Fig. 1 b is the schematic flow sheet of aerial matching method in the embodiment of the present invention one;
Fig. 1 c is the relation schematic diagram of antenna element operating frequency and antenna element return loss in correlation technique;
Fig. 1 d is the relation schematic diagram of antenna element operating frequency and antenna element return loss in the embodiment of the present invention one;
Fig. 2 a is the structural representation of antenna-matching circuit in the embodiment of the present invention two;
Fig. 2 b is the relation schematic diagram of antenna element operating frequency and antenna element return loss in correlation technique;
Fig. 2 c is the relation schematic diagram of antenna element operating frequency and antenna element return loss in the embodiment of the present invention two;
Fig. 3 a is the structural representation of electronic equipment in the embodiment of the present invention three;
Fig. 3 b is the relation schematic diagram of antenna element operating frequency and antenna element return loss in correlation technique;
Fig. 3 c is the relation schematic diagram of antenna element operating frequency and antenna element return loss in the embodiment of the present invention three.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment one
The present embodiment records a kind of aerial matching method, be applied in electronic equipment as shown in Figure 1a, described electronic equipment comprises antenna element 11 and radio frequency unit 12, described electronic equipment also comprises antenna matching unit 13 and control unit 14, and described antenna matching unit 13 comprises: the first capacitive unit 131, switch element 132, second capacitive unit 133 and inductive unit 134;
The first terminal of described first capacitive unit 131 is connected with described antenna element 11, and the second terminal of described first capacitive unit 131 is connected with the first terminal of described radio frequency unit 12 and described switch element 132;
Second terminal of described switch element 132 is connected with the described the first terminal of the second capacitive unit 133, the first terminal of described inductive unit 134 respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit 133, described inductive unit 134, described switch element 132 supports a unit in the second capacitive unit 133 described in conducting and described inductive unit 134;
In practical application, described control unit 14 can be realized by the baseband chip in electronic equipment; Described switch element 132 can be realized by electronic devices and components such as the triode in electronic equipment with gating function, applies different voltage control signals, with conducting second capacitive unit 133 or inductive unit 134 by control unit 14 at switch element 132; Described first capacitive unit 131 can be realized by the tunable capacitor in electronic equipment, or the lc circuit be made up of inductance and tunable capacitor realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than the first frequency range, and described first frequency range is the frequency range that the resonance frequency departing from described antenna element 11 does not exceed first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than the second frequency range, and described second frequency range is depart from the frequency range of resonance frequency between first threshold and Second Threshold of described antenna element 11, and described Second Threshold is greater than described first threshold;
Described second capacitive unit 133 can be realized by the electric capacity in electronic equipment, or the lc circuit be made up of inductance and electric capacity realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than described second frequency range.
Described inductive unit 134 can be realized by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need higher than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need lower than described second frequency range.
Inventor finds in the practice of the invention, in correlation technique, when realizing electronic equipment to wide band support, departing from antenna element 11 resonance frequency and exceeding the frequency range of first threshold, the numerical value (absolute value) of the return loss of antenna element 11 does not obviously reduce, show the impedance matching of antenna element 11 better, but exceed first threshold departing from antenna element 11 resonance frequency, do not exceed the frequency range (described Second Threshold is greater than described first threshold) of Second Threshold, the numerical value (absolute value) of the return loss of antenna element 11 obviously reduces, show the impedance matching of antenna element 11 poor, below with antenna element 11 be operated in depart from antenna element 11 resonance frequency do not exceed first threshold time, the return loss numerical value of antenna element 11 how is made to maintain high value, namely optimum Match (make the imaginary part of input impedance close to zero or be zero) is carried out in the input impedance of antenna element 11, and antenna element 11 is operated in and departs from antenna element 11 resonance frequency and exceed first threshold, when not exceeding Second Threshold, the return loss numerical value of antenna element 14 how is made to maintain high value, namely carry out optimum Match to the input impedance of antenna element 11 to be described.
As shown in Figure 1 b, the aerial matching method that the present embodiment is recorded comprises the following steps:
Step 101, controls inductive unit 134 described in the second capacitive unit 133 described in the conducting of described switch element 132 or conducting in the first frequency range.
In practical application, switch element 132 conducting second capacitive unit 133 or conducting inductive unit 134, can according in the first frequency range, first capacitive unit 131 and the second capacitive unit 133 pairs of antenna elements 11 carry out impedance matching (make the impedance of antenna element 11 close to zero or be zero) time antenna element 11 return loss (being set to the first return loss), and when the first capacitive unit 131 and inductive unit 134 pairs of antenna elements 11 carry out impedance matching, the return loss (being set to the second return loss) of antenna element 11 is determined; Such as, in the first frequency range, when the numerical value (absolute value) of the first return loss is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 11 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control switch unit 132 conducting first capacitive unit 131 in step 101;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control switch unit 132 conducting second capacitive unit 133 in step 101.
Step 102, controls described first capacitive unit 131 and changes the capacitance self presented, and to make described first capacitive unit 131 and the unit of described switch element 132 conductings, carries out impedance matching to described antenna element 11.
In practical application, the capacitance of the first capacitive unit 131 applies different voltage control signals by control unit 14 in the first capacitive unit 131 and realizes.
Step 103, controls in the second frequency range the unit that described switch element 132 switches institute's conducting.
Step 104, controls described first capacitive unit 131 and carries out impedance matching with the unit of described switch element 132 switched conductive to described antenna element 11.
Wherein, described second frequency range is that the resonance frequency departing from described antenna element 11 exceedes described first threshold and is less than the frequency range of Second Threshold.
For conducting in step 101 second capacitive unit 133, inventor implements to find in process of the present invention, in the first frequency range, when the numerical value of the first return loss is higher than the second return loss numerical value, correspondingly in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is, control unit 14 control switch unit 132 switches in the unit of step 101 conducting, by making antenna element 11 have larger return loss in the second frequency range, namely realizes optimum Match to antenna element 11 in the input of the second frequency range.
Because the first capacitive unit 131 adopts the form of tunable capacitor, therefore, in the present embodiment, control unit 14 can by applying different voltage control signals in described first capacitive unit 131, to change the capacitance that the first capacitive unit 131 presents self, thus can with the unit of switch element 132 switched conductive described in control unit 14, jointly in the second frequency range, impedance matching is carried out to described antenna element 11.
In order to the beneficial effect that the present embodiment brings is described, inventor is to the electronic equipment supporting 698-960MHz frequency range in correlation technique, and the electronic equipment implementing technical solution of the present invention is tested, Fig. 1 c is when realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, as can be seen from Fig. 1 c, frequency range f1 ~ the f2 of first threshold is not exceeded at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is obviously reduce, but exceed first threshold departing from antenna element 11 resonance frequency, do not exceed the frequency range f2 ~ f3 of Second Threshold, the return loss of antenna element 11 occurs obviously to reduce, have a strong impact on the performance of antenna element,
When Fig. 1 d is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 11 and the schematic diagram of antenna return loss, as shown in Figure 1 d, frequency range f1 ~ the f2 of first threshold is not exceeded in deflects electrons device antenna unit 11 resonance frequency, and depart from antenna element 11 resonance frequency and exceed first threshold, do not exceed the frequency range f2 of Second Threshold ~ f3, there is not obvious reduction in the return loss (corresponding ordinate) of antenna element 11, demonstrates feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 11, such as, the return loss of antenna element 11 can be reduced the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range departing from antenna element 11 resonance frequency and do not exceed first threshold; The return loss of antenna element 11 is reduced the frequency range of relatively large (as decreasing beyond 2 decibels), as departing from the frequency range of antenna element 11 resonance frequency between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of antenna element resonance frequency comparatively large (between first threshold and Second Threshold), by switching in the unit (the second capacitive unit 131 or inductive unit 134) of the heterogeneity impedance that the first frequency range uses, the input impedance of antenna element 11 is mated, guarantee that the return loss numerical value (absolute value) of antenna element 11 can not obviously reduce, ensure that the performance of antenna element 11.
Embodiment two
The present embodiment records a kind of antenna-matching circuit, be applied in electronic equipment as shown in Figure 2 a, described electronic equipment comprises antenna element 21 and radio frequency unit 22, described electronic equipment also comprises antenna-matching circuit 23 and control unit 24, and described antenna-matching circuit 23 comprises: the first capacitive unit 231, switch element 232, second capacitive unit 233 and inductive unit 234;
The first terminal of described first capacitive unit 231 is connected with described antenna element 21, and the second terminal of described first capacitive unit 231 is connected with the first terminal of described radio frequency unit 22 and described switch element 232;
Second terminal of described switch element 232 is connected with the described the first terminal of the second capacitive unit 233, the first terminal of described inductive unit 234 respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit 233, described inductive unit 234, described switch element 232 supports a unit in the second capacitive unit 233 described in conducting and described inductive unit 234;
In practical application, described control unit 24 can be realized by the baseband chip in electronic equipment; Described switch element 232 can be realized by electronic devices and components such as the triode in electronic equipment with gating function, applies different voltage control signals, with conducting second capacitive unit 233 or inductive unit 234 by control unit 24 at switch element 232; Described first capacitive unit 231 can be realized by the tunable capacitor in electronic equipment, or the lc circuit be made up of inductance and tunable capacitor realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than the first frequency range, and described first frequency range is the frequency range that the resonance frequency departing from described antenna element 21 does not exceed first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than the second frequency range, and described second frequency range is depart from the frequency range of resonance frequency between first threshold and Second Threshold of described antenna element 21, and described Second Threshold is greater than described first threshold;
Described second capacitive unit 233 can be realized by the electric capacity in electronic equipment, or the lc circuit be made up of inductance and electric capacity realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than described second frequency range.
Described inductive unit 234 can be realized by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need higher than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need lower than described second frequency range.
Inventor finds in the practice of the invention, in correlation technique, when realizing electronic equipment to wide band support, departing from antenna element 21 resonance frequency and exceeding the frequency range of first threshold, the numerical value (absolute value) of the return loss of antenna element 21 does not obviously reduce, show the impedance matching of antenna element 21 better, but exceed first threshold departing from antenna element 21 resonance frequency, do not exceed the frequency range (described Second Threshold is greater than described first threshold) of Second Threshold, the numerical value (absolute value) of the return loss of antenna element 21 obviously reduces, show the impedance matching of antenna element 21 poor, below with antenna element 21 be operated in depart from antenna element 21 resonance frequency do not exceed first threshold time, the return loss numerical value of antenna element 21 how is made to maintain high value, namely optimum Match (make the imaginary part of input impedance close to zero or be zero) is carried out in the input impedance of antenna element 21, and antenna element 21 is operated in and departs from antenna element 21 resonance frequency and exceed first threshold, when not exceeding Second Threshold, the return loss numerical value of antenna element 24 how is made to maintain high value, namely carry out optimum Match to the input impedance of antenna element 21 to be described.
Antenna-matching circuit as shown in Figure 2 a, wherein,
Described control unit 24, for controlling inductive unit 234 described in the second capacitive unit 233 described in the conducting of described switch element 232 or conducting in the first frequency range.
In practical application, switch element 232 conducting second capacitive unit 233 or conducting inductive unit 234, can according in the first frequency range, first capacitive unit 231 and the second capacitive unit 233 pairs of antenna elements 21 carry out impedance matching (make the impedance of antenna element 21 close to zero or be zero) time antenna element 21 return loss (being set to the first return loss), and when the first capacitive unit 231 and inductive unit 234 pairs of antenna elements 21 carry out impedance matching, the return loss (being set to the second return loss) of antenna element 21 is determined; Such as, in the first frequency range, when the numerical value (absolute value) of the first return loss is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 21 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control unit 24 control switch unit 232 conducting first capacitive unit 231;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control unit 24 control switch unit 232 conducting second capacitive unit 233.
Described control unit 24, also for controlling described first capacitive unit 231 and the unit of described switch element 232 conductings in described first frequency range, carries out impedance matching to described antenna element 21.
Described control unit 24, also for when described first frequency range controls the second capacitive unit 233 described in the conducting of described switch element 232, control described first capacitive unit 231 and change the capacitance self presented, make described first capacitive unit 231 and described second capacitive unit 233 carry out impedance matching in described first frequency range to described antenna element 21, be greater than the second return loss to make the first return loss;
Described control unit 24, also for when described first frequency range controls inductive unit 234 described in the conducting of described switch element 232, control described first capacitive unit 231 and change the capacitance self presented, make described first capacitive unit 231 and described inductive unit 234 carry out impedance matching in described first frequency range to described antenna element 21, be greater than described first return loss to make described second return loss; Wherein,
Described first return loss for utilizing described first capacitive unit 231 and described second capacitive unit 233 when described first frequency range carries out impedance matching to described antenna element 21, the return loss of described antenna element 21; Described second return loss for utilizing described first capacitive unit 231 and described inductive unit 234 when described first frequency range carries out impedance matching to described antenna element 21, the return loss of described antenna element 21.
In practical application, the capacitance of the first capacitive unit 231 applies different voltage control signals by control unit 24 in the first capacitive unit 231 and realizes.
Described control unit 24, also for controlling the unit that described switch element 232 switches institute's conducting in the second frequency range.
Described control unit 24, also carries out impedance matching with the unit of described switch element 232 switched conductive to described antenna element 21 for controlling described first capacitive unit 231 in described second frequency range.
Described control unit 24, also change for controlling described first capacitive unit 231 in described second frequency range the capacitance self presented, and control described first capacitive unit 231 and the unit of described switch element 232 switched conductive, impedance matching is carried out to described antenna element 21.
Wherein, described second frequency range is that the resonance frequency departing from described antenna element 21 exceedes described first threshold and is less than the frequency range of Second Threshold.
For control unit 24 in the first frequency range conducting second capacitive unit 233, inventor implements to find in process of the present invention, in the first frequency range, when the numerical value of the first return loss is higher than the second return loss numerical value, correspondingly in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is, control unit 24 control switch unit 232 switches in the unit of the first frequency range institute conducting, by making antenna element 21 have larger return loss in the second frequency range, namely realizes optimum Match to antenna element 21 in the input of the second frequency range.
Because the first capacitive unit 231 adopts the form of tunable capacitor, therefore, in the present embodiment, control unit 24 can by applying different voltage control signals in described first capacitive unit 231, to change the capacitance that the first capacitive unit 231 presents self, thus can with the unit of switch element 232 switched conductive described in control unit 24, jointly in the second frequency range, impedance matching is carried out to described antenna element 21.
In order to the beneficial effect that the present embodiment brings is described, inventor is to the electronic equipment supporting 698-960MHz frequency range in correlation technique, and the electronic equipment implementing technical solution of the present invention is tested, Fig. 2 b is when realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, as can be seen from Fig. 2 b, frequency range f1 ~ the f2 of first threshold is not exceeded at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is obviously reduce, but exceed first threshold departing from antenna element 21 resonance frequency, do not exceed the frequency range f2 ~ f3 of Second Threshold, the return loss of antenna element 21 occurs obviously to reduce, have a strong impact on the performance of antenna element,
When Fig. 2 c is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 21 and the schematic diagram of antenna return loss, as shown in Figure 2 c, frequency range f1 ~ the f2 of first threshold is not exceeded in deflects electrons device antenna unit 21 resonance frequency, and depart from antenna element 21 resonance frequency and exceed first threshold, do not exceed the frequency range f2 of Second Threshold ~ f3, there is not obvious reduction in the return loss (corresponding ordinate) of antenna element 21, demonstrates feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 21, such as, the return loss of antenna element 21 can be reduced the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range departing from antenna element 21 resonance frequency and do not exceed first threshold; The return loss of antenna element 21 is reduced the frequency range of relatively large (as decreasing beyond 2 decibels), as departing from the frequency range of antenna element 21 resonance frequency between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of antenna element resonance frequency comparatively large (between first threshold and Second Threshold), by switching in the unit (the second capacitive unit 231 or inductive unit 234) of the heterogeneity impedance that the first frequency range uses, the input impedance of antenna element 21 is mated, guarantee that the return loss numerical value (absolute value) of antenna element 21 can not obviously reduce, ensure that the performance of antenna element 21.
Embodiment three
The present embodiment records a kind of electronic equipment, as shown in Figure 3 a, described electronic equipment comprises antenna element 31 and radio frequency unit 32, described electronic equipment also comprises antenna-matching circuit 33 and control unit 34, and described antenna-matching circuit 33 comprises: the first capacitive unit 331, switch element 332, second capacitive unit 333 and inductive unit 334;
The first terminal of described first capacitive unit 331 is connected with described antenna element 31, and the second terminal of described first capacitive unit 331 is connected with the first terminal of described radio frequency unit 32 and described switch element 332;
Second terminal of described switch element 332 is connected with the described the first terminal of the second capacitive unit 333, the first terminal of described inductive unit 334 respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit 333, described inductive unit 334, described switch element 332 supports a unit in the second capacitive unit 333 described in conducting and described inductive unit 334;
In practical application, described control unit 34 can be realized by the baseband chip in electronic equipment; Described switch element 332 can be realized by electronic devices and components such as the triode in electronic equipment with gating function, applies different voltage control signals, with conducting second capacitive unit 333 or inductive unit 334 by control unit 34 at switch element 332; Described first capacitive unit 331 can be realized by the tunable capacitor in electronic equipment, or the lc circuit be made up of inductance and tunable capacitor realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than the first frequency range, and described first frequency range is the frequency range that the resonance frequency departing from described antenna element 31 does not exceed first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than the second frequency range, and described second frequency range is depart from the frequency range of resonance frequency between first threshold and Second Threshold of described antenna element 31, and described Second Threshold is greater than described first threshold;
Described second capacitive unit 333 can be realized by the electric capacity in electronic equipment, or the lc circuit be made up of inductance and electric capacity realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need lower than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need higher than described second frequency range.
Described inductive unit 334 can be realized by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition realizes; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need higher than described first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need lower than described second frequency range.
Inventor finds in the practice of the invention, in correlation technique, when realizing electronic equipment to wide band support, departing from antenna element 31 resonance frequency and exceeding the frequency range of first threshold, the numerical value (absolute value) of the return loss of antenna element 31 does not obviously reduce, show the impedance matching of antenna element 31 better, but exceed first threshold departing from antenna element 31 resonance frequency, do not exceed the frequency range (described Second Threshold is greater than described first threshold) of Second Threshold, the numerical value (absolute value) of the return loss of antenna element 31 obviously reduces, show the impedance matching of antenna element 31 poor, below with antenna element 31 be operated in depart from antenna element 31 resonance frequency do not exceed first threshold time, the return loss numerical value of antenna element 31 how is made to maintain high value, namely optimum Match (make the imaginary part of input impedance close to zero or be zero) is carried out in the input impedance of antenna element 31, and antenna element 31 is operated in and departs from antenna element 31 resonance frequency and exceed first threshold, when not exceeding Second Threshold, the return loss numerical value of antenna element 34 how is made to maintain high value, namely carry out optimum Match to the input impedance of antenna element 31 to be described.
Electronic equipment as shown in Figure 3 a, wherein,
Described control unit 34, for controlling inductive unit 334 described in the second capacitive unit 333 described in the conducting of described switch element 332 or conducting in the first frequency range.
In practical application, switch element 332 conducting second capacitive unit 333 or conducting inductive unit 334, can according in the first frequency range, first capacitive unit 331 and the second capacitive unit 333 pairs of antenna elements 31 carry out impedance matching (make the impedance of antenna element 31 close to zero or be zero) time antenna element 31 return loss (being set to the first return loss), and when the first capacitive unit 331 and inductive unit 334 pairs of antenna elements 31 carry out impedance matching, the return loss (being set to the second return loss) of antenna element 31 is determined; Such as, in the first frequency range, when the numerical value (absolute value) of the first return loss is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 31 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control unit 34 control switch unit 332 conducting first capacitive unit 331;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control unit 34 control switch unit 332 conducting second capacitive unit 333.
Described control unit 34, also for controlling described first capacitive unit 331 and the unit of described switch element 332 conductings, carries out impedance matching to described antenna element 31.
Described control unit 34, also for when described first frequency range controls the second capacitive unit 333 described in the conducting of described switch element 332, control described first capacitive unit 331 and change the capacitance self presented, make described first capacitive unit 331 and described second capacitive unit 333 carry out impedance matching in described first frequency range to described antenna element 31, be greater than the second return loss to make the first return loss;
Described control unit 34, also for when described first frequency range controls inductive unit 334 described in the conducting of described switch element 332, control described first capacitive unit 331 and change the capacitance self presented, make described first capacitive unit 331 and described inductive unit 334 carry out impedance matching in described first frequency range to described antenna element 31, be greater than described first return loss to make described second return loss; Wherein,
Described first return loss for utilizing described first capacitive unit 331 and described second capacitive unit 333 when described first frequency range carries out impedance matching to described antenna element 31, the return loss of described antenna element 31; Described second return loss for utilizing described first capacitive unit 331 and described inductive unit 334 when described first frequency range carries out impedance matching to described antenna element 31, the return loss of described antenna element 31.
In practical application, the capacitance of the first capacitive unit 331 applies different voltage control signals by control unit 34 in the first capacitive unit 331 and realizes.
Described control unit 34, also for controlling the unit that described switch element 332 switches institute's conducting in the second frequency range.
Described control unit 34, also carries out impedance matching with the unit of described switch element 332 switched conductive to described antenna element 31 for controlling described first capacitive unit 331 in described second frequency range.
Described control unit 34, also change for controlling described first capacitive unit 331 in described second frequency range the capacitance self presented, and control described first capacitive unit 331 and the unit of described switch element 332 switched conductive, impedance matching is carried out to described antenna element 31.
Wherein, described second frequency range is that the resonance frequency departing from described antenna element 31 exceedes described first threshold and is less than the frequency range of Second Threshold.
For control unit 34 in the first frequency range conducting second capacitive unit 333, inventor implements to find in process of the present invention, in the first frequency range, when the numerical value of the first return loss is higher than the second return loss numerical value, correspondingly in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is, control unit 34 control switch unit 332 switches in the unit of the first frequency range institute conducting, by making antenna element 31 have larger return loss in the second frequency range, namely realizes optimum Match to antenna element 31 in the input of the second frequency range.
Because the first capacitive unit 331 adopts the form of tunable capacitor, therefore, in the present embodiment, control unit 34 can by applying different voltage control signals in described first capacitive unit 331, to change the capacitance that the first capacitive unit 331 presents self, thus can with the unit of switch element 332 switched conductive described in control unit 34, jointly in the second frequency range, impedance matching is carried out to described antenna element 31.
In order to the beneficial effect that the present embodiment brings is described, inventor is to the electronic equipment supporting 698-960MHz frequency range in correlation technique, and the electronic equipment implementing technical solution of the present invention is tested, Fig. 3 b is when realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, as can be seen from Fig. 3 b, frequency range f1 ~ the f2 of first threshold is not exceeded at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is obviously reduce, but exceed first threshold departing from antenna element 31 resonance frequency, do not exceed the frequency range f2 ~ f3 of Second Threshold, the return loss of antenna element 31 occurs obviously to reduce, have a strong impact on the performance of antenna element,
When Fig. 3 c is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 31 and the schematic diagram of antenna return loss, as shown in Figure 3 c, frequency range f1 ~ the f2 of first threshold is not exceeded in deflects electrons device antenna unit 31 resonance frequency, and depart from antenna element 31 resonance frequency and exceed first threshold, do not exceed the frequency range f2 of Second Threshold ~ f3, there is not obvious reduction in the return loss (corresponding ordinate) of antenna element 31, demonstrates feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 31, such as, the return loss of antenna element 31 can be reduced the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range departing from antenna element 31 resonance frequency and do not exceed first threshold; The return loss of antenna element 31 is reduced the frequency range of relatively large (as decreasing beyond 2 decibels), as departing from the frequency range of antenna element 31 resonance frequency between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of antenna element resonance frequency comparatively large (between first threshold and Second Threshold), by switching in the unit (the second capacitive unit 331 or inductive unit 334) of the heterogeneity impedance that the first frequency range uses, the input impedance of antenna element 31 is mated, guarantee that the return loss numerical value (absolute value) of antenna element 31 can not obviously reduce, ensure that the performance of antenna element 31.
In several embodiments that the application provides, should be understood that disclosed equipment and method can realize by another way.Apparatus embodiments described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, and as: multiple unit or assembly can be in conjunction with, maybe can be integrated into another system, or some features can be ignored, or do not perform.In addition, the coupling each other of shown or discussed each part or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of equipment or unit or communication connection can be electrical, machinery or other form.
The above-mentioned unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, also can be distributed in multiple network element; Part or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can all be integrated in a processing unit, also can be each unit individually as a unit, also can two or more unit in a unit integrated; Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that hardware also can be adopted to add application function unit realizes.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: movable storage device, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disc or CD etc. various can be program code stored medium.
Or, if the above-mentioned integrated unit of the present invention using the form of applied function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of application product the part that prior art contributes in essence in other words, these computer application products are stored in a storage medium, comprise some instructions and perform all or part of of method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, service or the network equipment etc.).And aforesaid storage medium comprises: movable storage device, ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (11)
1. an aerial matching method, be applied in the electronic equipment with antenna element and radio frequency unit, it is characterized in that, described electronic equipment also comprises antenna matching unit, and described antenna matching unit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described first capacitive unit is connected with described antenna element, and the second terminal of described first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
Second terminal of described switch element is connected with the first terminal of described second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit, described inductive unit, described switch element supports a unit in the second capacitive unit described in conducting and described inductive unit;
Described method comprises:
Inductive unit described in the second capacitive unit described in described switching means conductive or conducting is controlled in the first frequency range;
Control the unit of described first capacitive unit and the conducting of described switch element institute in described first frequency range, impedance matching is carried out to described antenna element; Wherein, described first frequency range is the frequency range that the resonance frequency departing from described antenna element does not exceed first threshold;
The unit that described switch element switches institute's conducting is controlled in the second frequency range;
The unit controlling described first capacitive unit and described switch element institute switched conductive in described second frequency range carries out impedance matching to described antenna element; Wherein,
Described second frequency range is that the resonance frequency departing from described antenna element exceedes described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
2. method according to claim 1, it is characterized in that, when controlling the second capacitive unit described in described switching means conductive in the first frequency range, the described unit controlling described first capacitive unit and the conducting of described switch element institute in described first frequency range, impedance matching is carried out to described antenna element, comprising:
Control described first capacitive unit and change the capacitance self presented, make described first capacitive unit and described second capacitive unit carry out impedance matching in described first frequency range to described antenna element, be greater than the second return loss to make the first return loss; Wherein,
Described first return loss for utilizing described first capacitive unit and described second capacitive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element; Described second return loss for utilizing described first capacitive unit and described inductive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element.
3. method according to claim 1, it is characterized in that, when controlling inductive unit described in described switching means conductive in the first frequency range, the described unit controlling described first capacitive unit and the conducting of described switch element institute in described first frequency range, impedance matching is carried out to described antenna element, comprising:
Control described first capacitive unit and change the capacitance self presented, make described first capacitive unit and described inductive unit carry out impedance matching in described first frequency range to described antenna element, be greater than the first return loss to make the second return loss; Wherein,
Described first return loss for utilizing described first capacitive unit and described second capacitive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element; Described second return loss for utilizing described first capacitive unit and described inductive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element.
4. method according to claim 1, is characterized in that, the described unit controlling described first capacitive unit and described switch element institute switched conductive in described second frequency range, carries out impedance matching, comprising described antenna element:
Control described first capacitive unit in described second frequency range and change the capacitance self presented;
Control the unit of described first capacitive unit and described switch element institute switched conductive, impedance matching is carried out to described antenna element.
5. the method according to any one of Claims 1-4, is characterized in that,
The type of described first capacitive unit comprises: adjustable electric perhaps presents the circuit of capacitive;
The type of described second capacitive unit comprises: electric capacity or present the circuit of capacitive;
The type of described inductive unit comprises: inductance or present perception circuit.
6. an antenna-matching circuit, is applied in the electronic equipment with antenna element and radio frequency unit, it is characterized in that, described antenna-matching circuit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described first capacitive unit is connected with described antenna element, and the second terminal of described first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
Second terminal of described switch element is connected with the first terminal of described second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described second capacitive unit, described inductive unit, described switch element supports a unit in the second capacitive unit described in conducting and described inductive unit;
Described antenna-matching circuit also comprises:
Control unit, for controlling inductive unit described in the second capacitive unit described in described switching means conductive or conducting in the first frequency range;
Control the unit of described first capacitive unit and the conducting of described switch element institute, impedance matching is carried out to described antenna element; Wherein, described first frequency range is the frequency range that the resonance frequency departing from described antenna element does not exceed first threshold;
Described control unit, also switches the unit of institute's conducting for controlling described switch element in the second frequency range;
The unit controlling described first capacitive unit and described switch element institute switched conductive in described second frequency range carries out impedance matching to described antenna element; Wherein,
Described second frequency range is that the resonance frequency departing from described antenna element exceedes described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
7. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also for when described first frequency range controls the second capacitive unit described in described switching means conductive, control described first capacitive unit and change the capacitance self presented, make described first capacitive unit and described second capacitive unit carry out impedance matching in described first frequency range to described antenna element, be greater than the second return loss to make the first return loss; Wherein,
Described first return loss for utilizing described first capacitive unit and described second capacitive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element; Described second return loss for utilizing described first capacitive unit and described inductive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element.
8. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also for when described first frequency range controls inductive unit described in described switching means conductive, control described first capacitive unit and change the capacitance self presented, make described first capacitive unit and described inductive unit carry out impedance matching in described first frequency range to described antenna element, be greater than the first return loss to make the second return loss; Wherein,
Described first return loss for utilizing described first capacitive unit and described second capacitive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element; Described second return loss for utilizing described first capacitive unit and described inductive unit when described first frequency range carries out impedance matching to described antenna element, the return loss of described antenna element.
9. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also changes for controlling described first capacitive unit in described second frequency range the capacitance self presented, and controls the unit of described first capacitive unit and described switch element institute switched conductive, carry out impedance matching to described antenna element.
10. the antenna-matching circuit according to any one of claim 6 to 9, is characterized in that,
The type of described first capacitive unit comprises: adjustable electric perhaps presents the circuit of capacitive;
The type of described second capacitive unit comprises: electric capacity or present the circuit of capacitive;
The type of described inductive unit comprises: inductance or present perception circuit.
11. 1 kinds of electronic equipments, comprise the antenna-matching circuit described in any one of claim 6 to 10.
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| CN104518812B (en) * | 2014-12-01 | 2017-11-10 | 惠州Tcl移动通信有限公司 | A kind of mobile terminal switching antenna and its switching method |
| CN105789836B (en) * | 2014-12-24 | 2019-06-25 | 联想(北京)有限公司 | Antenna system and mobile terminal |
| CN105977640B (en) * | 2016-04-29 | 2018-10-26 | 北京小米移动软件有限公司 | Antenna tuning method, apparatus, antenna and terminal device |
| CN109150326A (en) * | 2018-11-05 | 2019-01-04 | Oppo（重庆）智能科技有限公司 | Antenna impedance adjustment method, electronic device and computer readable storage medium |
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| US7224241B2 (en) * | 2005-03-04 | 2007-05-29 | Jue Martin F | Extended matching range tuner |
| US7936315B2 (en) * | 2008-09-30 | 2011-05-03 | Cheng Uei Precision Industry Co., Ltd. | Antenna system and method for making the same |
| US8306481B2 (en) * | 2009-10-30 | 2012-11-06 | Infineon Technologies Ag | Single pole multi throw switch |
| CN103518325B (en) * | 2011-05-09 | 2016-08-24 | 株式会社村田制作所 | Impedance matching switching circuit, antenna assembly, radio frequency power amplifier and communication terminal |
| US9002278B2 (en) * | 2012-02-29 | 2015-04-07 | Htc Corporation | Simple automatic antenna tuning system and method |
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