CN105281796A - Antenna matching circuit of terminal, and terminal - Google Patents
Antenna matching circuit of terminal, and terminal Download PDFInfo
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- CN105281796A CN105281796A CN201410333057.3A CN201410333057A CN105281796A CN 105281796 A CN105281796 A CN 105281796A CN 201410333057 A CN201410333057 A CN 201410333057A CN 105281796 A CN105281796 A CN 105281796A
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- transmission line
- antenna
- impedance matching
- impedance
- matching network
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Abstract
The invention provides an antenna matching circuit of a terminal, and a terminal. The antenna matching circuit comprises a first impedance matching network and a second impedance matching network. The first impedance matching network is connected to an antenna feed point of the terminal and used for impedance matching for antenna reception signals. The output end of the first impedance matching network is connected to one end of a transmission line with a preset length. The second impedance matching network is connected to the other end of the transmission line and used for impedance matching for output signals of the transmission line. The output end of the second impedance matching network is connected to a radio frequency test stand of the terminal. The antenna reception signals include high-frequency signals and low-frequency signals. The transmission line with a preset length enables the impedance of both the high-frequency signals and the low-frequency signals that pass across the transmission line to be capacitive reactance or inductive reactance. According to the above scheme, the two ends of the transmission line with a preset length are provided with matching networks respectively, and the high-frequency bandwidth and the low-frequency bandwidth of antenna signals are adjusted by means of the transmission line, so the broadening bandwidth of an antenna is increased, and the matching performance of an antenna is improved.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of antenna-matching circuit of terminal and terminal.
Background technology
In recent years, along with the fast development of mobile communication technology, mobile terminal needs to support more frequency range.Along with the extensive use of multimode multi-frequency mobile phone, the application frequency band range requiring antenna for mobile phone to support is more and more wider, and current matched position is fixing, and this just causes antenna when regulating Bandwidth, more limited.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of antenna-matching circuit and terminal of terminal, in order to solve in prior art because matched position is fixed, causes antenna when regulating Bandwidth, more limited problem.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of antenna-matching circuit, comprising:
Be connected with the antenna feed point of terminal, for carrying out the first impedance matching network of impedance matching to antenna receiving signal;
The output of described first impedance matching network is connected to one end of the transmission line of a preset length;
Be connected with the other end of described transmission line, for carrying out the second impedance matching network of impedance matching to the output signal of described transmission line, the output of described second impedance matching network connects the radio frequency testing seat of described terminal;
Wherein, described antenna receiving signal comprises HFS signal and low frequency part signal, and the transmission line of described preset length makes the impedance of the described HFS signal after described transmission line and described low frequency part signal be condensance or inductive reactance.
Further, described first impedance matching network is connected with described transmission line by the first radio frequency transmission line terminals, and described second impedance matching network is connected with described transmission line by the second radio frequency transmission line terminals.
Further, the preset length foundation of described transmission line
obtain;
Wherein, Z
inexpression is input to the impedance in the first radio frequency transmission line terminals via the first impedance matching network, Z
crepresent the specified impedance of transmission line, Z
lexpression outputs to the impedance in the second radio frequency transmission line terminals via transmission line, λ represents wavelength, and L represents length of transmission line, and j is a constant.
Further, described first impedance matching network is made up of electric capacity and inductance, is L-type, Pi type or double L-shaped.
Further, described second impedance matching network is made up of electric capacity and inductance, is L-type, Pi type or double L-shaped.
The embodiment of the present invention provides a kind of terminal, comprises above-mentioned antenna-matching circuit.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme, by the transmission line two ends in preset length, impedance matching network is set respectively, utilizes transmission line to regulate the bandwidth of the High-frequency and low-frequency of antenna, widened antenna frequency band range, improve the matching performance of antenna.
Accompanying drawing explanation
Fig. 1 is the annexation schematic diagram of the described antenna-matching circuit of the embodiment of the present invention;
Fig. 2 is described low-frequency impedance and the distribution schematic diagram of high-frequency resistance on Smith circle diagram before adjustment;
Fig. 3 is described low-frequency impedance and the distribution schematic diagram of high-frequency resistance on Smith circle diagram after adjustment.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed to because matched position is fixed in existing technology, cause antenna when regulating Bandwidth, more limited problem, provides a kind of antenna-matching circuit and terminal of terminal.
As shown in Figure 1, the described antenna-matching circuit of the embodiment of the present invention, comprising:
Be connected with the antenna feed point of terminal, for carrying out the first impedance matching network of impedance matching to antenna receiving signal;
The output of described first impedance matching network is connected to one end of the transmission line (Cable) of a preset length;
Be connected with the other end of described transmission line, for carrying out the second impedance matching network of impedance matching to the output signal of described transmission line, the output of described second impedance matching network connects the radio frequency testing seat of described terminal;
Wherein, described antenna receiving signal comprises HFS signal and low frequency part signal, and the transmission line of described preset length makes the impedance of the described HFS signal after described transmission line and described low frequency part signal be condensance or inductive reactance.
The above embodiment of the present invention, by being connected with the transmission line of one section of preset length, and at the newly-increased matching network of the opposite side of transmission line, the transmission line of the preset length increased is utilized to regulate the bandwidth of the High-frequency and low-frequency of antenna, widen the frequency band range of antenna, improve the matching performance of antenna.
It should be noted that described first impedance matching network is connected with described transmission line by the first radio frequency transmission line terminals, described second impedance matching network is connected with described transmission line by the second radio frequency transmission line terminals.
As shown in Figure 2, before not increasing transmission line, the impedance of the low frequency of described signal is at A point, and the impedance of high frequency is at B point, if during by crosstalk sense or serial capacitors coupling, capital has influence on another point, thus can not meet coupling requirement, by the impedance position of high frequency, on Smith circle diagram, determine the impedance position of low frequency, make the impedance of the two drop on same half district, then pass through formula
obtain the length L of transmission line;
Wherein, Z
inexpression is input to the impedance in the first radio frequency transmission line terminals via the first impedance matching network, Z
crepresent the specified impedance of transmission line, Z
lexpression outputs to the impedance in the second radio frequency transmission line terminals via transmission line, λ represents wavelength, and L represents length of transmission line, and j is a constant.
The transmission line that low frequency is 1/4 wavelength if connect, because low-and high-frequency in the working frequency range of antenna for mobile phone is the relation of roughly frequency multiplication, so high frequency is approximately 1/2 wavelength, such result is that low frequency turns half-turn, and high frequency turns around, as shown in Figure 3, adjust rear A and forwarded the position of A ' to, made the impedance of the impedance of high frequency and low frequency all be positioned at a Ge Ban district, by utilizing the newly-increased matching network being arranged on the transmission line other end, add new coupling bandwidth, improve the matching performance of antenna.
Particularly, described the second newly-increased impedance matching network is made up of electric capacity and inductance, is L-type, Pi type or double L-shaped, and what it should be noted that described second matching network is specifically configured to well-known to those skilled in the art, is no longer described in detail at this.
The design process of described antenna-matching circuit is: first arrange the first impedance matching network be connected with antenna feed point, described first impedance matching network is made up of electric capacity and inductance, for L-type, Pi type or double L-shaped, the output impedance of signal after the first impedance matching network can be obtained by the impedance measuring or calculate the first radio frequency transmission line terminals place, then according to the position of the impedance of the High-frequency and low-frequency on Smith circle diagram, determine the size of the output impedance after transmission line, the length of transmission line is being calculated with this, after transmission line is connected to match circuit, at the opposite side of transmission line, second impedance matching network is set, by carrying out emulation testing to the second impedance matching network, obtain the set-up mode of the second optimum impedance matching network, an optimum antenna-matching circuit is obtained with this.
Should be noted that, because of when the specified impedance of transmission line is certain, input impedance is relevant with position and frequency, because antenna will support multiple frequency range, and be lumped elements, if so just fix a position to put coupling, there is the situation that different frequency range can not be compatible, after connecing transmission line, change the position of impedance, thus reach and mate object preferably.
The embodiment of the present invention provides a kind of terminal, comprises above-mentioned antenna-matching circuit.
It should be noted that the terminal adding described antenna-matching circuit, extend the coupling bandwidth of terminal, improve the market competitiveness of terminal.
Above-described is the preferred embodiment of the present invention; should be understood that the ordinary person for the art; not departing under principle prerequisite of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. an antenna-matching circuit for terminal, is characterized in that, comprising:
Be connected with the antenna feed point of terminal, for carrying out the first impedance matching network of impedance matching to antenna receiving signal;
The output of described first impedance matching network is connected to one end of the transmission line of a preset length;
Be connected with the other end of described transmission line, for carrying out the second impedance matching network of impedance matching to the output signal of described transmission line, the output of described second impedance matching network connects the radio frequency testing seat of described terminal;
Wherein, described antenna receiving signal comprises HFS signal and low frequency part signal, and the transmission line of described preset length makes the impedance of the described HFS signal after described transmission line and described low frequency part signal be condensance or inductive reactance.
2. antenna-matching circuit according to claim 1, it is characterized in that, described first impedance matching network is connected with described transmission line by the first radio frequency transmission line terminals, and described second impedance matching network is connected with described transmission line by the second radio frequency transmission line terminals.
3. antenna-matching circuit according to claim 2, is characterized in that, the preset length foundation of described transmission line
Obtain;
Wherein, Z
inexpression is input to the impedance in the first radio frequency transmission line terminals via the first impedance matching network, Z
crepresent the specified impedance of transmission line, Z
lexpression outputs to the impedance in the second radio frequency transmission line terminals via transmission line, λ represents wavelength, and L represents length of transmission line, and j is a constant.
4. antenna-matching circuit according to claim 1, is characterized in that, described first impedance matching network is made up of electric capacity and inductance, is L-type, Pi type or double L-shaped.
5. antenna-matching circuit according to claim 1, is characterized in that, described second impedance matching network is made up of electric capacity and inductance, is L-type, Pi type or double L-shaped.
6. a terminal, is characterized in that, comprising: the antenna-matching circuit as described in any one of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333057.3A CN105281796B (en) | 2014-07-14 | 2014-07-14 | The antenna-matching circuit and terminal of a kind of terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333057.3A CN105281796B (en) | 2014-07-14 | 2014-07-14 | The antenna-matching circuit and terminal of a kind of terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105281796A true CN105281796A (en) | 2016-01-27 |
| CN105281796B CN105281796B (en) | 2017-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410333057.3A Active CN105281796B (en) | 2014-07-14 | 2014-07-14 | The antenna-matching circuit and terminal of a kind of terminal |
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Cited By (5)
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| CN110176966A (en) * | 2019-05-28 | 2019-08-27 | Oppo广东移动通信有限公司 | A kind of radio circuit adjustment method, device and computer readable storage medium |
| CN111246511A (en) * | 2020-01-19 | 2020-06-05 | 惠州Tcl移动通信有限公司 | Call testing system, method and device |
| CN112262499A (en) * | 2018-07-05 | 2021-01-22 | 三星电子株式会社 | Antenna module using transmission line length and electronic device including the same |
| CN112864639A (en) * | 2020-12-31 | 2021-05-28 | 京信网络系统股份有限公司 | Impedance matching network design method of radio frequency interface, impedance matching device and equipment |
| CN114498039A (en) * | 2021-12-18 | 2022-05-13 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Double-end matching method for improving matching effect of monopole antenna |
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| CN114498039B (en) * | 2021-12-18 | 2022-12-02 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Double-end matching method for improving matching effect of monopole antenna |
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| CN105281796B (en) | 2017-12-08 |
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Effective date of registration: 20170922 Address after: 430000, East Lake New Technology Development Zone, Wuhan, Optics Valley, two West of the road, 19 hi tech four North, four hi tech Road, No. -1, Hubei Applicant after: Motorola mobile communications software (Wuhan) Co., Ltd. Address before: 430079 Hubei Province, Wuhan City East Industrial Park East Lake New Technology Development Zone, Optics Valley Road No. 77 building A16, a Hong Kong Financial Applicant before: Lenovo mobile communication software (Wuhan) Co., Ltd. |
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