CN105896086B - The matching process and device of impedance - Google Patents
The matching process and device of impedance Download PDFInfo
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- CN105896086B CN105896086B CN201610268615.1A CN201610268615A CN105896086B CN 105896086 B CN105896086 B CN 105896086B CN 201610268615 A CN201610268615 A CN 201610268615A CN 105896086 B CN105896086 B CN 105896086B
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- impedance
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- power consumption
- frequency power
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
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Abstract
The present invention provides the matching process and device of a kind of impedance, and the matching process of the impedance includes: at least two initial impedances for obtaining antenna and being under passive states；When the antenna is in active, the first radio-frequency power consumption that the antenna is in corresponding terminal under each initial impedance is obtained；According to first radio-frequency power consumption, determine that the target impedance of the antenna, the target impedance are used to make the output impedance and the current impedance matching of the antenna of radio-frequency power amplifier in the initial impedance；The present impedance of the antenna is adjusted to the target impedance.The matching process and device of impedance of the invention, the impedance under passive states is according to antenna, obtain the radio-frequency power consumption of the terminal in active, impedance is obtained by radio-frequency power consumption, to make the output impedance of radio-frequency power amplifier and the impedance matching of the antenna, to reduce power consumption, extend battery uses the time.
Description
Technical field
The present invention relates to field of terminal technology, more particularly to the matching process and device of a kind of impedance.
Background technique
Existing radio-frequency technique, after antenna form is fixed, loadpull (load, which is drawn, to move) position of antenna is with regard to basic
On be fixed up, which draws pan position to be used to determine the impedance of antenna, but by tuning device (such as RF1117,
The SPXT of RF1118, RF1119 etc are switched), the position loadpull of adjustable antenna, namely the impedance of adjustment antenna.When
When the actual impedance of output impedance and antenna of radio-frequency power amplifier is inconsistent (namely mismatch), radio frequency letter will result in
Number reflection enhancement increase output electric current so that more radio-frequency emission power be lost.
Since antenna often debugs antenna match according to the position of standing wave, to reach efficiency highest under passive states.
But the impedance in passive efficiency highest, it is easy in the active state not with the output impedance of radio-frequency power amplifier
Match, namely be easy to so that radio-frequency power amplifier mismatch, causes the loss of power, to increase the power consumption of terminal, contracts
Short service time of battery.
Summary of the invention
The embodiment of the present invention provides the matching process and device of a kind of impedance, to solve existing resistive matching process power consumption
Measure bigger, the shorter technical problem of service time of battery.
To solve the above problems, technical solution provided by the invention is as follows:
The embodiment of the present invention provides a kind of matching process of impedance comprising:
It obtains antenna and is at least two initial impedances under passive states；
When the antenna is in active, obtains the antenna and be in corresponding terminal under each initial impedance
The first radio-frequency power consumption；
According to first radio-frequency power consumption, the target impedance of the antenna, the target are determined in the initial impedance
Impedance is used to make the output impedance and the current impedance matching of the antenna of radio-frequency power amplifier；
The present impedance of the antenna is adjusted to the target impedance.
The embodiment of the present invention also provides a kind of coalignment of impedance comprising:
First obtains module, at least two initial impedances being under passive states for obtaining antenna；
Second obtains module, is in each described first for when the antenna is in active, obtaining the antenna
First radio-frequency power consumption of corresponding terminal under beginning impedance；
Determining module, for determining the target of the antenna in the initial impedance according to first radio-frequency power consumption
Impedance, the target impedance are used to make the output impedance and the current impedance matching of the antenna of radio-frequency power amplifier；
Module is adjusted, for adjusting the present impedance of the antenna to the target impedance.
Compared to the prior art, the matching process and device of the impedance of the present embodiment is in passive shape by obtaining antenna
At least two initial impedances under state；When the antenna is in active, obtains the antenna and be under each initial impedance
First radio-frequency power consumption of corresponding terminal；According to first radio-frequency power consumption, the target resistance of the antenna is determined in the initial impedance
Anti-, which is used to make the output impedance and the current impedance matching of the antenna of radio-frequency power amplifier；By the antenna
Present impedance is adjusted to the target impedance.Due to the impedance being under passive states according to antenna, terminal is obtained in active
When radio-frequency power consumption, by radio-frequency power consumption obtain impedance, to make the output impedance of radio-frequency power amplifier and the resistance of the antenna
Anti- matching, to reduce power consumption, extend battery uses the time.
Detailed description of the invention
Fig. 1 is the flow chart of the matching process for the impedance that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of the matching process of impedance provided by Embodiment 2 of the present invention；
Fig. 3 is the flow chart of the matching process for the impedance that the embodiment of the present invention three provides；
Fig. 4 is the structural schematic diagram of the coalignment for the impedance that the embodiment of the present invention four provides；
Fig. 5 is the preferred structure schematic diagram of the coalignment for the impedance that the embodiment of the present invention four provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those skilled in the art's every other implementation obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is the flow chart of the matching process for the impedance that the embodiment of the present invention one provides.
The matching process of the impedance of this preferred embodiment, comprising:
Step S101 obtains antenna and is at least two initial impedances under passive states.
For example, when terminal is not connected with access point (Access Point, AP), by obtaining antenna to antenna adjustment
At least two impedances, the impedance are obtained according to the determination of the position of antenna loadpull, that is, the initial impedance is that antenna does not connect
When receiving the radiofrequency signal of radio-frequency power amplifier transmitting (namely passive states), the impedance of the antenna.The terminal can be hand
The equipment such as machine, tablet computer.
Certainly, the highest impedance of the available passive efficiency of terminal or when passive states and radio-frequency power amplifier it is defeated
The impedance of impedance matching out is also possible to obtain multiple impedances that passive efficiency is located at preset range, to obtain initial impedance.
Step S102 obtains the antenna and is in corresponding under each initial impedance when the antenna is in active
First radio-frequency power consumption of terminal.
For example, terminal controls antenna by AP, the impedance of antenna is set to be equal to each initial impedance, and obtain in each initial resistance
Under anti-, the radio-frequency power consumption of corresponding terminal.
Step S103 determines the target impedance of the antenna according to first radio-frequency power consumption in the initial impedance.
For example, determining what antenna finally used according to the step S102 all radio-frequency power consumptions obtained or portion radio frequency power consumption
Impedance, in active, to make the output impedance of radio-frequency power amplifier and the impedance matching namely target resistance of the antenna
Resist the output impedance and the current impedance matching of the antenna for making radio-frequency power amplifier.
Step S104 adjusts the present impedance of the antenna to the target impedance.
For example, present impedance is the impedance that antenna is debugged at present namely the resistance that step S102 last time is debugged
It is anti-.Terminal adjusts the present impedance of antenna to target impedance.Due to the output impedance and antenna when radio-frequency power amplifier
When present impedance matches, the reflection of radiofrequency signal can be reduced, to reduce the power consumption of terminal.
The matching process of the impedance of this preferred embodiment is obtained due to the impedance being under passive states according to antenna
The radio-frequency power consumption of corresponding terminal when active obtains the final impedance of antenna by radio-frequency power consumption, to make radio-frequency power
The output impedance of amplifier and the impedance matching of the antenna, to reduce power consumption, extend battery uses the time.
Referring to figure 2., Fig. 2 is the flow chart of the matching process of impedance provided by Embodiment 2 of the present invention.
The matching process of the impedance of this preferred embodiment, comprising:
Step S201 debugs the antenna when antenna is in passive states, and obtains the second radio frequency function of terminal
Consumption；
For example, when terminal is not connected with access point (Access Point, AP), by obtaining at this time eventually to antenna adjustment
The radio-frequency power consumption at end namely the second radio-frequency power consumption.The terminal can be the equipment such as mobile phone, tablet computer.
Step S202 obtains at least two initial impedances of the antenna according to second radio-frequency power consumption.
For example, terminal obtains at least two impedances of antenna when the second radio-frequency power consumption is greater than preset threshold, obtain initial
Impedance.
In order to improve the accuracy that terminal determines target impedance, this obtains the antenna extremely according to second radio-frequency power consumption
The step of two initial impedances include: less
A, when second radio-frequency power consumption is located in preset range, at least two initial impedances of the antenna are obtained.
For example, terminal obtains at least two impedances namely the preset range of respective antenna when radio-frequency power consumption is relatively low
It can set based on experience value.
Step S203 obtains the antenna and is in corresponding under each initial impedance when the antenna is in active
First radio-frequency power consumption of terminal；
For example, terminal controls antenna by AP, the impedance of antenna is set to be equal to each initial impedance, and obtain in each initial resistance
Under anti-, the radio-frequency power consumption of corresponding terminal.
Step S204 determines the target impedance of the antenna according to first radio-frequency power consumption in the initial impedance；
For example, determining what antenna finally used according to the step S203 all radio-frequency power consumptions obtained or portion radio frequency power consumption
Impedance, in active, to make the output impedance of radio-frequency power amplifier and the impedance matching namely target resistance of the antenna
Resist the output impedance and the current impedance matching of the antenna for making radio-frequency power amplifier.
In order to improve treatment effeciency, minimum radio-frequency power consumption when the available active of terminal, by minimum radio-frequency power consumption
The impedance final as antenna of corresponding impedance value namely this according to first radio-frequency power consumption, determining in the initial impedance should
The step of target impedance of antenna includes:
(1) in first radio-frequency power consumption, the minimum value in first radio-frequency power consumption is obtained, the minimum value is corresponding just
Beginning, impedance was as target impedance.
For example, terminal obtains the minimum value in all radio-frequency power consumptions, by radio-frequency power consumption when the antenna is in active
In the corresponding antenna of minimum value impedance as the impedance finally used.
Step S205 adjusts the present impedance of the antenna to the target impedance.
For example, present impedance is the impedance that antenna is debugged at present namely the impedance that step S203 last time is debugged.
The present impedance of antenna is adjusted to target impedance by terminal.Due to working as the output impedance of radio-frequency power amplifier and working as antenna
When preceding impedance matching, the reflection of radiofrequency signal is reduced, to reduce the power consumption of terminal.
In order to further decrease the power consumption of terminal and improve the flexibility of terminal, when terminal can also be spaced certain
Between, reacquire antenna counterpart terminal under each initial impedance radio-frequency power consumption, this by the present impedance of the antenna adjust to
After the step of target impedance, this method further include:
(2) it according to preset interval duration, when the antenna is in active, returns and executes the acquisition antenna in each
Under the initial impedance the step of the first radio-frequency power consumption of corresponding terminal.
For example, due to the variation with the time, the output impedance of radio-frequency power amplifier also can dynamic change, therefore one section
In time, the matched antenna impedance of output impedance with radio-frequency power amplifier, in subsequent period, it is easy to no longer with radio frequency
The output impedance of power amplifier matches, therefore terminal compartment preset duration, controls antenna again through AP, makes the impedance of antenna
Equal to each initial impedance, and the radio-frequency power consumption of terminal is obtained, to obtain the corresponding antenna of minimum radio-frequency power consumption in the period
Impedance, to keep each period radio-frequency power consumption minimum.
The matching process of the impedance of this preferred embodiment, due to being debugged to antenna when antenna is in passive states,
And it obtains the second radio-frequency power consumption of terminal, obtain at least two initial impedances of the antenna according to second radio-frequency power consumption；And root
It is in the impedance under passive states according to antenna, obtains the radio-frequency power consumption of the terminal in active, is obtained most by radio-frequency power consumption
Whole impedance, to make the output impedance of radio-frequency power amplifier and the impedance matching of the antenna, to improve the spirit of terminal
Activity and treatment effeciency.
Referring to figure 3., Fig. 3 is the flow chart of the matching process for the impedance that the embodiment of the present invention three provides.
The present embodiment is described in detail so that terminal is smart phone as an example, the match party of the impedance of this preferred embodiment
Method, comprising:
Step S301, when antenna is in passive states, smart phone debugs the antenna, obtains two of antenna
Initial impedance；
For example, when smart phone is not connected with access point (Access Point, AP), by obtaining this to antenna adjustment
When smart phone radio-frequency power consumption, and obtain the impedance of the corresponding antenna of radio-frequency power consumption minimum value, obtain the first initial impedance；With
And obtain it is consistent with the output impedance of radio-frequency power amplifier when antenna impedance, obtain the second initial impedance.
Step S302, when the antenna is in active, smart phone obtains the antenna and is in each initial impedance
Under corresponding smart phone radio-frequency power consumption, obtain the first power consumption and the second power consumption；
For example, smart phone controls antenna by AP, so that the impedance of antenna is equal to the first initial impedance, obtain penetrating at this time
Frequency power consumption；And smart phone controls antenna by AP, so that the impedance of antenna is equal to the second initial impedance, obtains radio frequency at this time
Power consumption obtains the second power consumption.
Step S303, smart phone obtain the minimum value in the first power consumption and the second power consumption, obtain minimum power consumption；
For example, the first power consumption and the second power consumption are compared by smart phone, if the first power consumption less than the second power consumption,
Using the first power consumption as minimum power consumption, otherwise using the second power consumption as minimum power consumption.
Step S304, smart phone is using the corresponding impedance of minimum power consumption as the target impedance of the antenna；
For example, when smart phone determines the first power consumption as minimum power consumption, the first initial impedance is final as antenna
The impedance used, for another example, when smart phone determines the second power consumption as minimum power consumption, using the second initial impedance as antenna
The impedance finally used.
Step S305, smart phone adjust the present impedance of the antenna to the target impedance.
For example, when antenna present impedance be the first initial impedance, and target impedance be the second initial impedance when, if worked as
When smart phone connects access point, smart phone is by the impedance adjustment of antenna to the second initial impedance.
In another example when antenna present impedance be the second initial impedance, and target impedance be the first initial impedance when, if
When smart phone connects access point, smart phone is by the impedance adjustment of antenna to the first initial impedance.Remaining situation is not adjusted
It is whole.
Later, whether the time that the impedance that smart phone can also detect the antenna is in target impedance is more than default threshold
Value；
For example, when the time that the impedance that smart phone detects the antenna is in target impedance being less than preset threshold, then
It does not deal with.For example the impedance of antenna is maintained current target impedance value by smart phone.
When the time that the impedance that smart phone detects the antenna is in target impedance being more than preset threshold, then return step
S302, i.e. smart phone interval preset duration again through AP control antenna, make antenna impedance be equal to the first initial impedance and
Second initial impedance, and new radio-frequency power consumption of the antenna under the first initial impedance and the second initial impedance is obtained, to obtain
The impedance of the corresponding antenna of minimum radio-frequency power consumption in the period.
The matching process of the impedance of this preferred embodiment, since when antenna is in passive states, smart phone is to the day
Line is debugged, and two initial impedances of antenna are obtained；When the antenna is in active, smart phone is obtained at the antenna
The radio-frequency power consumption of corresponding mobile phone under each initial impedance；Smart phone obtains the minimum in the first power consumption and the second power consumption
Value, obtains minimum power consumption；Smart phone is using the corresponding impedance of minimum power consumption as the target impedance of the antenna；Later by the antenna
Present impedance adjust to the target impedance, to reduce power consumption, improve the flexibility of smart phone.
Referring to figure 4., Fig. 4 is the structural schematic diagram of the coalignment for the impedance that the embodiment of the present invention four provides.This is preferably
The coalignment 40 of the impedance of embodiment includes: that the first acquisition module 41, second obtains module 42, determining module 43, adjustment mould
Block 44；
First obtains module 41, at least two initial impedances being under passive states for obtaining antenna；
Second obtains module 42, is in each described for when the antenna is in active, obtaining the antenna
First radio-frequency power consumption of corresponding terminal under initial impedance；
Determining module 43, for determining the target impedance of the antenna in the initial impedance according to first radio-frequency power consumption,
The target impedance is used to make the output impedance and the current impedance matching of the antenna of radio-frequency power amplifier；
Module 44 is adjusted, for adjusting the present impedance of the antenna to the target impedance.
As shown in figure 5, the device further include: trigger module 45；
The trigger module 45 when the antenna is in active, triggers this and second obtains for according to preset interval duration
Modulus block 42, to execute the first radio-frequency power consumption for obtaining the antenna and being under each initial impedance.
The first acquisition module 41 includes: power consumption acquisition submodule 411 and impedance acquisition submodule 412；
The power consumption acquisition submodule 411, for being debugged to the antenna, and obtain when antenna is in passive states
Second radio-frequency power consumption of terminal；
The impedance acquisition submodule 412, for obtaining at least two initial resistances of the antenna according to second radio-frequency power consumption
It is anti-.
The impedance acquisition submodule 412 is specifically used for:
When second radio-frequency power consumption is located in preset range, at least two initial impedances of the antenna are obtained.
The determining module 43 is specifically used for:
In first radio-frequency power consumption, the minimum value in first radio-frequency power consumption is obtained, the minimum value is corresponding initial
Impedance is as target impedance.
When it is implemented, the above modules can be used as independent entity to realize, any combination can also be carried out, is made
It is realized for same or several entities, the specific implementation of the above modules can be found in the embodiment of the method for front, herein not
It repeats again.
The coalignment of the impedance of this preferred embodiment is obtained due to the impedance being under passive states according to antenna
The radio-frequency power consumption of corresponding terminal when active obtains the final impedance of antenna by radio-frequency power consumption, to make radio-frequency power
The output impedance of amplifier and the impedance matching of the antenna, to reduce power consumption, extend battery uses the time.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
The matching process and device for being provided for the embodiments of the invention a kind of impedance above are described in detail, herein
In apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to sides
Assistant solves method and its core concept of the invention；Meanwhile for those skilled in the art, according to the thought of the present invention, exist
There will be changes in specific embodiment and application range, in conclusion the content of the present specification should not be construed as to this hair
Bright limitation.
Claims (9)
1. a kind of matching process of impedance characterized by comprising
It obtains antenna and is at least two initial impedances under passive states；
When the antenna is in active, the antenna is in corresponding terminal under each initial impedance is obtained
One radio-frequency power consumption；
According to first radio-frequency power consumption, the target impedance of the antenna is determined in the initial impedance, comprising: described the
In one radio-frequency power consumption, the minimum value in first radio-frequency power consumption is obtained, using the corresponding initial impedance of the minimum value as mesh
Mark impedance；Wherein, the target impedance is used to make the output impedance and the current impedance of the antenna of radio-frequency power amplifier
Match；
The present impedance of the antenna is adjusted to the target impedance.
2. the matching process of impedance according to claim 1, which is characterized in that in the present impedance by the antenna
After the step of adjusting to the target impedance, the method also includes:
According to preset interval duration, when the antenna is in active, returns to the execution acquisition antenna and be in each institute
The step of stating the first radio-frequency power consumption of corresponding terminal under initial impedance.
3. the matching process of impedance according to claim 1, which is characterized in that the acquisition antenna is under passive states
At least two initial impedances the step of include:
When antenna is in passive states, the antenna is debugged, and obtains the second radio-frequency power consumption of terminal；
According to second radio-frequency power consumption, at least two initial impedances of the antenna are obtained.
4. the matching process of impedance according to claim 3, which is characterized in that it is described according to second radio-frequency power consumption,
The step of obtaining at least two initial impedance of the antenna include:
When second radio-frequency power consumption is located in preset range, at least two initial impedances of the antenna are obtained.
5. a kind of coalignment of impedance characterized by comprising
First obtains module, at least two initial impedances being under passive states for obtaining antenna；
Second obtains module, for obtaining the antenna and being in each initial resistance when the antenna is in active
First radio-frequency power consumption of corresponding terminal under anti-；
Determining module, for determining the target impedance of the antenna in the initial impedance according to first radio-frequency power consumption,
It is specifically for obtaining the minimum value in first radio-frequency power consumption in first radio-frequency power consumption, the minimum value is corresponding
Initial impedance as target impedance；Wherein, the target impedance for make the output impedance of radio-frequency power amplifier with it is described
The current impedance matching of antenna；
Module is adjusted, for adjusting the present impedance of the antenna to the target impedance.
6. the coalignment of impedance according to claim 5, which is characterized in that described device further include: trigger module；
The trigger module, for according to preset interval duration, when the antenna is in active, triggering described second to be obtained
Modulus block, to execute the first radio-frequency power consumption for obtaining the antenna and being in corresponding terminal under each initial impedance.
7. the coalignment of impedance according to claim 5, which is characterized in that the first acquisition module includes: power consumption
Acquisition submodule and impedance acquisition submodule；
The power consumption acquisition submodule, for being debugged to the antenna, and obtain terminal when antenna is in passive states
The second radio-frequency power consumption；
The impedance acquisition submodule, for obtaining at least two initial resistances of the antenna according to second radio-frequency power consumption
It is anti-.
8. the coalignment of impedance according to claim 7, which is characterized in that the impedance acquisition submodule is specifically used
In:
When second radio-frequency power consumption is located in preset range, at least two initial impedances of the antenna are obtained.
9. a kind of storage medium, is stored with computer program, wherein the computer program makes computer execute such as right
It is required that 1 to 4 described in any item methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610268615.1A CN105896086B (en) | 2016-04-26 | 2016-04-26 | The matching process and device of impedance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610268615.1A CN105896086B (en) | 2016-04-26 | 2016-04-26 | The matching process and device of impedance |
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| CN105896086A CN105896086A (en) | 2016-08-24 |
| CN105896086B true CN105896086B (en) | 2019-02-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108256368B (en) * | 2016-12-28 | 2021-10-26 | 航天信息股份有限公司 | Method and device for generating dual-port network |
| CN110855310A (en) * | 2018-07-26 | 2020-02-28 | 西安中兴新软件有限责任公司 | Matching circuit, terminal and matching method |
| 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 |
| CN109660663B (en) * | 2018-12-10 | 2023-04-07 | 维沃移动通信有限公司 | Antenna adjusting method and mobile terminal |
| CN111525260B (en) * | 2020-04-22 | 2021-10-08 | 深圳市广和通无线股份有限公司 | Antenna device |
| CN112152660B (en) * | 2020-09-25 | 2022-04-15 | Oppo（重庆）智能科技有限公司 | Control method and device of radio frequency circuit and electronic equipment |
| CN113131216B (en) * | 2021-03-15 | 2022-11-18 | 联想(北京)有限公司 | Control method and device, equipment and storage medium |
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| CN102404015A (en) * | 2010-09-10 | 2012-04-04 | 索尼爱立信移动通讯有限公司 | Antenna matching structure, antenna matching method and wireless communication terminal |
| CN102521639A (en) * | 2011-11-17 | 2012-06-27 | 天津大学 | Active RFID (Radio Frequency Identification) tag with passive awakening function based on multi-antenna |
| CN103546178A (en) * | 2012-07-09 | 2014-01-29 | 宏达国际电子股份有限公司 | Mobile communication device and impedance matching method thereof |
| CN105337631A (en) * | 2015-09-23 | 2016-02-17 | 青岛海信移动通信技术股份有限公司 | Antenna matching method, device, and system and mobile terminal |
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| US20030030504A1 (en) * | 2001-08-10 | 2003-02-13 | Telefonaktiebolaget Lm Ericsson | Tunable impedance matching circuit for RF power amplifier |
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|---|---|---|---|---|
| CN102404015A (en) * | 2010-09-10 | 2012-04-04 | 索尼爱立信移动通讯有限公司 | Antenna matching structure, antenna matching method and wireless communication terminal |
| CN102521639A (en) * | 2011-11-17 | 2012-06-27 | 天津大学 | Active RFID (Radio Frequency Identification) tag with passive awakening function based on multi-antenna |
| CN103546178A (en) * | 2012-07-09 | 2014-01-29 | 宏达国际电子股份有限公司 | Mobile communication device and impedance matching method thereof |
| CN105337631A (en) * | 2015-09-23 | 2016-02-17 | 青岛海信移动通信技术股份有限公司 | Antenna matching method, device, and system and mobile terminal |
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