CN204391273U - A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching - Google Patents
A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching Download PDFInfo
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- CN204391273U CN204391273U CN201420723798.8U CN201420723798U CN204391273U CN 204391273 U CN204391273 U CN 204391273U CN 201420723798 U CN201420723798 U CN 201420723798U CN 204391273 U CN204391273 U CN 204391273U
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- antenna
- tunable capacitor
- mobile terminal
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Abstract
The utility model provides a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, and the antenna-matching circuit that this antenna adopts tunable capacitor to form and the antenna body be overlying on support form whole antenna structure.Wherein, antenna body structure is IFA antenna, be suitable for more and more miniaturized mobile terminal device, and the first end of the first tunable capacitor connects antenna body, the second end connects external equipment, and the second tunable capacitor connects the first end of the first tunable capacitor, other end ground connection, the antenna-matching circuit that this basic structure is formed is convenient to be adjusted the working frequency range of antenna, to achieve the impedance matching of antenna body and external equipment, makes the bandwidth of operation of antenna be able to effective expansion.The antenna structure that the utility model provides is simple, is easy to make, and be suitable for applying in adverse circumstances, small volume does not take too much space, facilitates the Miniaturization Design of the mobile terminal being equipped with this antenna.
Description
Technical field
The utility model relates to mobile terminal antenna, particularly a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching.
Background technology
In recent years, along with LTE system uses more and more universal on mobile phone, antenna for mobile phone is constantly towards compact design evolution, and the space that LTE antenna can take is reduced increasingly, and frequency range but must increase relatively, causes antenna efficiency to reduce.Engineer is faced with three large technical difficulties, comprises the frequency range that the LTE antenna for mobile phone that how effectively increases is supported; The gesture of cellie will cause the skew of impedance, reduce the efficiency of antenna transmission; And how the size of antenna will design under less volume, that is under maintenance RF antenna performance, not influential system footprint.
In order to solve the contradiction in this space and performance, scientific research and engineering field develop the new antenna of some function admirables gradually, comprise mimo antenna, switched antenna, LOOP antenna, adjustable antenna etc.This adjustable antenna wherein forming impedance matching by tunable capacitor due to area occupied little, bandwidth, causes the extensive concern of industry.
The operation principle of adjustable antenna is: by controlling the bias voltage of tunable capacitor chip, thus the capacitance size of tunable capacitor is finely tuned, the impedance matching of antenna will be adjustable and produce multiple different state due to tunable capacitor capacitance size, these different impedance matching condition are combined, just the very wide broad band mobile phone antenna of frequency band can be formed, under different scene, provided the matching status of its correspondence by cell phone control circuit, make the antenna return loss under this state and efficiency the best.
But in practical engineering application, because tunable capacitor itself exists certain insertion loss and ghost effect, there is certain difference in the definite value electric capacity of itself radio-frequency performance and size such as capacitance such as grade, adjustable antenna is caused to lack good antenna and match circuit combining form, be difficult to realize the oriented cover to each sub-band in height frequency range, simultaneously limited in one's ability to widening of frequency band, it is also comparatively obvious that efficiency reduces, and can not be widely used in various high efficiency, broadband application occasion as theoretical prediction.
Utility model content
The purpose of this utility model is to provide a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, with solve the insertion loss of tunable capacitor itself that existing tunable capacitor antenna exists and the antenna that ghost effect causes can not extensive use and high efficiency, broadband application occasion problem.
Second object of the present utility model is to provide a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, change in wider scope with the working frequency range realizing mobile terminal broad-band antenna, realize the oriented cover to each sub-band in height frequency range simultaneously.
3rd object of the present utility model is to provide a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, simple with the making realizing mobile terminal broad-band antenna, take up room less object.
For achieving the above object, the utility model provides a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, comprise support and fixing antenna body on the bracket and antenna-matching circuit, described antenna body is electrically connected with antenna-matching circuit, described antenna body is string configuration, this string configuration has a distributing point and an earth point, described string configuration is divided into a long-armed and galianconism by described distributing point, and described earth point is positioned on described galianconism;
Described antenna-matching circuit comprises the first tunable capacitor and the second tunable capacitor, described antenna-matching circuit is electrically connected with described distributing point by the first end of described first tunable capacitor, second end of described first tunable capacitor is electrically connected with external equipment, the first end ground connection of described second tunable capacitor, the second end of described second tunable capacitor is electrically connected with the second end of described first tunable capacitor;
Wherein, described first tunable capacitor is for adjusting low frequency signal frequency range, and described second tunable capacitor is for adjusting high-frequency signal frequency range.
Preferably, described width that is long-armed and described shortwall is the Breadth Maximum of described support, and the length of described string configuration is the maximum length of described support.
Preferably, described string configuration has the first extending structure at the end points place of described long-armed side, and described first extending structure covers the end points of the described support at corresponding end place; Described string configuration has the second extending structure at the end points place of described galianconism side, and described second extending structure covers the end points of the described support at corresponding end place.
Preferably, antenna-matching circuit also comprises one first inductance, one end ground connection of described first inductance, and the other end is electrically connected with the second end of described first tunable capacitor, and described second tunable capacitor and described first inductance form LC resonant circuit.
Preferably, antenna-matching circuit also comprises the second inductance and the 3rd tunable capacitor, the first end ground connection of described second inductance, second end of described second inductance is electrically connected with the earth point of described antenna body, the first end ground connection of described 3rd tunable capacitor, the second end of described 3rd tunable capacitor is electrically connected with the first end of described first tunable capacitor; Wherein, described second inductance is for improving the return loss of low-band signal, and described 3rd tunable capacitor is for improving the high frequency performance of aerial signal.
The utility model provides a kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, and the antenna-matching circuit that this antenna adopts tunable capacitor to form and the antenna body be overlying on support form whole antenna structure.Wherein, antenna body structure is IFA antenna, be suitable for more and more miniaturized mobile terminal device, and the antenna-matching circuit that tunable capacitor is formed conveniently adjusts the working frequency range of antenna, to achieve the impedance matching of antenna body and external equipment (as signal processing apparatus), multiple Different matching state that tunable capacitor is formed is corresponding respectively with corresponding communication frequency band, by the mode switched, make the bandwidth of operation of antenna be able to effective expansion, achieve the oriented cover to each sub-band in height frequency range.
The antenna structure that the utility model provides is simple, is easy to make, and be suitable for applying in adverse circumstances, small volume does not take too much space, facilitates the Miniaturization Design of the mobile terminal being equipped with this antenna.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the antenna of the utility model preferred embodiment;
Fig. 2 is the antenna body structural representation of the utility model preferred embodiment;
Fig. 3 is the antenna-matching circuit structural representation of the utility model embodiment one;
Fig. 4 is the antenna-matching circuit structural representation of the utility model embodiment two;
Fig. 5 is the antenna-matching circuit structural representation of the utility model embodiment three;
Fig. 6 is the antenna actual measurement return loss multimode composite diagram of the utility model embodiment three;
Fig. 7 is the antenna efficiency by inputoutput test multimode composite diagram of the utility model embodiment three.
Embodiment
For better the utility model being described, provide preferred embodiment of the present utility model by reference to the accompanying drawings, to be described in detail to the utility model, specific as follows:
Embodiment one:
As shown in Figure 1, the employing tunable capacitor that the utility model provides carries out the mobile terminal broad-band antenna of impedance matching, the antenna body 200 comprising support 100 and be fixed on support 100 and antenna-matching circuit 300 (not shown in figure 1), antenna body 200 is electrically connected with antenna-matching circuit 300.As shown in Figure 2, antenna body 200 is string configuration, and this string configuration has distributing point 201 and an earth point 202, this string configuration is divided into one long-armed 204 and one galianconism 203 by distributing point 201, and earth point 202 is positioned on galianconism 203.
Long-armed 204 and the width of galianconism 203 be the Breadth Maximum of support 100, the length of this string configuration is the maximum length of support 100, namely antenna body is paved with as much as possible on support, the bandwidth that single status occupies in height frequency range can be widened to greatest extent, so that antenna-matching circuit adopts minimum status number to cover whole working band.
In addition, string configuration has the end points that the first extending structure 206, first extending structure 206 covers the support 100 at corresponding end place at the end points place of long-armed 204 sides; String configuration has the end points that the second extending structure 205, second extending structure 205 covers the support 100 at corresponding end place at the end points place of described galianconism 203 side.
As shown in Figure 3, the antenna-matching circuit 300 that the present embodiment provides comprises the first tunable capacitor 301 and the second tunable capacitor 302, antenna-matching circuit 300 is connected with the distributing point of antenna body 200 by the first end of the first tunable capacitor 301, second end of the first tunable capacitor 302 is connected with equipment such as signal processing apparatus of this antenna structure outside, the first end ground connection of the second tunable capacitor 302, the second end of the second tunable capacitor 302 is connected with the second end of the first tunable capacitor 301.
The first tunable capacitor 301 in the present embodiment is for adjusting the low frequency signal frequency range of antenna, and the second tunable capacitor 302 is for adjusting antenna high-frequency signal frequency range.When the capacitance of adjustment first tunable capacitor, the high frequency band signal of antenna is unaffected, and low-frequency range 698 ~ 960MHz is with interior resonance signal then along with capacitance increase is moved toward low frequency direction gradually.When the capacitance of adjustment second tunable capacitor, the low-band signal of antenna is unaffected, and high band 1710 ~ 2170MHz is with interior resonance signal then along with capacitance increase is moved toward high frequency direction gradually.
Embodiment two:
In the present embodiment except antenna-matching circuit and embodiment one different except, remainder is all identical with embodiment one.Antenna-matching circuit 300 in the present embodiment as shown in Figure 4, the basis of its antenna-matching circuit provided in embodiment one adds the first inductance 303.Wherein, one end ground connection of the first inductance 303, the other end is connected with the second end of the first tunable capacitor 301.The second tunable capacitor 302 in the present embodiment and the first inductance 303 constitute LC resonant circuit.The resonance wave that this LC resonant tank is formed forms double resonance ripple jointly by with existing low-frequency resonant ripple in 698 ~ 960MHz frequency range, has widened the frequency bandwidth of single status.
Embodiment three:
In the present embodiment except antenna-matching circuit and embodiment one different except, remainder is all identical with embodiment one.Antenna-matching circuit 300 in the present embodiment as shown in Figure 5, the basis of its antenna-matching circuit provided in embodiment two adds the second inductance 305 and the 3rd tunable capacitor 304.Wherein, one end ground connection of the second inductance 305, the other end is connected with the earth point 202 of antenna body 200; One end ground connection of the 3rd tunable capacitor 304, the other end is connected with the first end of the first tunable capacitor 301.The second inductance 305 in the present embodiment can improve the return loss of antenna low-band signal effectively, and the 3rd tunable capacitor 304 is for improving the performance of antenna at high band.When the capacitance of adjustment the 3rd tunable capacitor, along with the capacitance of the 3rd tunable capacitor increases, the return loss of high frequency harmonic signals will reduce further.
Antenna provided by the utility model, its implementation environment is as follows, and PCB is of a size of 120mm × 60mm, and head room is 3mm, and stent size is 60mm × 5mm × 3mm.With reference to figure 6 and Fig. 7, for the antenna performance test result figure (the different capacitances of state 1 to state 7 as shown in Table 1) that the utility model embodiment three provides, wherein, the first inductance value during test is 3.6nH, second inductance value is 12nH, test result shows that this antenna can realize 698MHz ~ 960MHz, the reception of 1710MHz ~ 2170MHz broad frequency band range signals and transmission, the return loss of this antenna of test display is simultaneously less than-5dB, efficiency is greater than-4dB, can meet the application demand of LTE communication agreement preferably.
Table one: the multimode of the present embodiment is corresponding with the different value of each tunable capacitor to be shown
Be to be understood that, connection between each device recited above is electrical connection, and the inductance value in antenna-matching circuit is only explanation the utility model embodiment effect, similarly, the variable capacitance parameter of 1 to the state of state shown in table one 7 is also only and technique effect of the present utility model is described, it will be appreciated by those skilled in the art that each group of inductance, variable capacitance parameter value disclosed in embodiment, and the PCB size, stent size etc. of implementation environment are all not limited.
The above; be only embodiment of the present utility model; but protection range of the present utility model is not limited thereto; any those skilled in the art is in the technical scope that the utility model discloses; the distortion do the utility model or replacement, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of described claim.
Claims (5)
1. the mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching, comprise support and fixing antenna body on the bracket and antenna-matching circuit, described antenna body is electrically connected with antenna-matching circuit, it is characterized in that, described antenna body is string configuration, this string configuration has a distributing point and an earth point, described string configuration is divided into a long-armed and galianconism by described distributing point, and described earth point is positioned on described galianconism;
Described antenna-matching circuit comprises the first tunable capacitor and the second tunable capacitor, described antenna-matching circuit is electrically connected with described distributing point by the first end of described first tunable capacitor, second end of described first tunable capacitor is electrically connected with external equipment, the first end ground connection of described second tunable capacitor, the second end of described second tunable capacitor is electrically connected with the second end of described first tunable capacitor;
Wherein, described first tunable capacitor is for adjusting low frequency signal frequency range, and described second tunable capacitor is for adjusting high-frequency signal frequency range.
2. an antenna as claimed in claim 1, it is characterized in that, antenna-matching circuit also comprises one first inductance, one end ground connection of described first inductance, the other end is electrically connected with the second end of described first tunable capacitor, and described second tunable capacitor and described first inductance form LC resonant circuit.
3. an antenna as claimed in claim 2, it is characterized in that, antenna-matching circuit also comprises the second inductance and the 3rd tunable capacitor, the first end ground connection of described second inductance, second end of described second inductance is electrically connected with the earth point of described antenna body, the first end ground connection of described 3rd tunable capacitor, the second end of described 3rd tunable capacitor is electrically connected with the first end of described first tunable capacitor; Wherein, described second inductance is for improving the return loss of low-band signal, and described 3rd tunable capacitor is for improving the high frequency performance of aerial signal.
4. the employing tunable capacitor according to claim 1 or 2 or 3 carries out the mobile terminal broad-band antenna of impedance matching, it is characterized in that, described width that is long-armed and described shortwall is the Breadth Maximum of described support, and the length of described string configuration is the maximum length of described support.
5. the employing tunable capacitor according to claim 1 or 2 or 3 carries out the mobile terminal broad-band antenna of impedance matching, it is characterized in that, described string configuration has the first extending structure at the end points place of described long-armed side, and described first extending structure covers the end points of the described support at corresponding end place; Described string configuration has the second extending structure at the end points place of described galianconism side, and described second extending structure covers the end points of the described support at corresponding end place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723798.8U CN204391273U (en) | 2014-11-27 | 2014-11-27 | A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420723798.8U CN204391273U (en) | 2014-11-27 | 2014-11-27 | A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching |
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| Publication Number | Publication Date |
|---|---|
| CN204391273U true CN204391273U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420723798.8U Expired - Fee Related CN204391273U (en) | 2014-11-27 | 2014-11-27 | A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377444A (en) * | 2014-11-27 | 2015-02-25 | 上海安费诺永亿通讯电子有限公司 | Mobile terminal broadband antenna with adjustable capacitors for impedance matching |
| WO2017107451A1 (en) * | 2015-12-22 | 2017-06-29 | 乐视控股（北京）有限公司 | Tunable antenna and mobile terminal |
-
2014
- 2014-11-27 CN CN201420723798.8U patent/CN204391273U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377444A (en) * | 2014-11-27 | 2015-02-25 | 上海安费诺永亿通讯电子有限公司 | Mobile terminal broadband antenna with adjustable capacitors for impedance matching |
| CN104377444B (en) * | 2014-11-27 | 2018-09-07 | 上海安费诺永亿通讯电子有限公司 | A kind of mobile terminal broad-band antenna carrying out impedance matching using tunable capacitor |
| WO2017107451A1 (en) * | 2015-12-22 | 2017-06-29 | 乐视控股（北京）有限公司 | Tunable antenna and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20191127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |