CN102158245B - Multi-frequency band mobile phone - Google Patents

Multi-frequency band mobile phone Download PDF

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Publication number
CN102158245B
CN102158245B CN2011100285341A CN201110028534A CN102158245B CN 102158245 B CN102158245 B CN 102158245B CN 2011100285341 A CN2011100285341 A CN 2011100285341A CN 201110028534 A CN201110028534 A CN 201110028534A CN 102158245 B CN102158245 B CN 102158245B
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capacitive unit
mobile phone
multiband mobile
ground plane
frequency range
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CN102158245A (en
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张莲
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Suzhou Xineng Environmental Protection Technology Co ltd
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Huizhou TCL Mobile Communication Co Ltd
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Abstract

The invention discloses a multi-frequency band mobile phone, which comprises a PIFA (planar inverted-F antenna), a capacitive unit and a control chip, wherein the control chip is used for controlling the coupling state between the capacitive unit and the PIFA and further changing the resonance frequency of the PIFA. By adopting the way, the mobile phone can meet the multi-frequency band working requirement of the mobile phone by controlling the coupling state between the capacitive unit and the PIFA, and has the advantages of having a simple structure, a low cost, a space-saving property and the like.

Description

A kind of multiband mobile phone
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of multiband mobile phone.
Background technology
Mobile phone adopts PIFA antenna (planar inverted-F antenna) to receive or emitting radio frequency signal usually.The radiofrequency signal of mobile phone comprises a lot of frequency ranges, for example, and GSM850, GSM900, DCS1800 and PCS1900.
The user expects that mobile phone can carry out work in frequency range as much as possible, namely needs corresponding multiband aerial to cover these frequency ranges.PIFA antenna of the prior art is designed to dual-band antenna, and its working frequency range is GSM900 and PCS1900, but still can not satisfy the demand of user's multiband.Therefore, a plurality of antennas of design satisfy multiband work in mobile phone, take the big quantity space of mobile phone.
Therefore, need provide a kind of multiband mobile phone, the technical problem that can not meet consumers' demand with the working frequency range that solves the support of prior art antenna for mobile phone.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of multiband mobile phone, to satisfy the demand of mobile phone multiband work.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of multiband mobile phone is provided, comprise PIFA antenna, capacitive unit and control chip, the antenna body parallel interval of capacitive unit and PIFA antenna arranges, and the open end of the position of capacitive unit and PIFA antenna overlaps, the couple state of control chip control capacitive unit and PIFA antenna is to change the resonance frequency of PIFA antenna.
According to one preferred embodiment of the present invention, the multiband mobile phone further comprises ground plane and switch, and switch is connected between ground plane and the capacitive unit, the conducting of control chip control switch or disconnection.
According to one preferred embodiment of the present invention, switch is diode.
According to one preferred embodiment of the present invention, the positive pole of diode connects capacitive unit, and the negative pole of diode connects ground plane, and the control signal output of control chip connects the positive pole of diode.
According to one preferred embodiment of the present invention, the PIFA antenna comprises antenna body and the earth terminal that is connected with antenna body and feed end, and capacitive unit is arranged between antenna body and the ground plane.
According to one preferred embodiment of the present invention, capacitive unit is patch conductor.
According to one preferred embodiment of the present invention, antenna body comprises the first frequency range branch and the second frequency range branch, and capacitive unit comprises first capacitive unit and second capacitive unit, first capacitive unit is arranged between the first frequency range branch and the ground plane, and second capacitive unit is arranged between the second frequency range branch and the ground plane.
According to one preferred embodiment of the present invention, first capacitive unit is arranged between the open end and ground plane of the first frequency range branch, and second capacitive unit is arranged between the open end and ground plane of the second frequency range branch.
According to one preferred embodiment of the present invention, first capacitive unit and second capacitive unit are patch conductor.
According to one preferred embodiment of the present invention, switch is triode or metal-oxide-semiconductor.
The invention has the beneficial effects as follows: be different from the situation of prior art, multiband mobile phone of the present invention can satisfy the demand of mobile phone multiband work, have simple in structure, cost is low and save advantage such as space.
Description of drawings
Fig. 1 is the structure chart according to the multiband mobile phone of first embodiment of the invention;
Fig. 2 is the equivalent circuit diagram of a kind of operating state of PIFA antenna among Fig. 1; And
Fig. 3 is the equivalent circuit diagram of the another kind of operating state of PIFA antenna among Fig. 1.
Embodiment
See also Fig. 1 to Fig. 3, Fig. 1 is the structure chart according to the multiband mobile phone of first embodiment of the invention.As shown in Figure 1, multiband mobile phone of the present invention comprises: the ground plane 105 of PIFA antenna 101, capacitive unit 102, control chip 103, diode 104 and printed circuit board (PCB).The couple state of control chip 103 control capacitive unit 102 and PIFA antenna 101 is to change the resonance frequency of PIFA antenna 101.
In the present embodiment, PIFA antenna 101 comprises antenna body 106 and the earth terminal 107 that is connected with antenna body 106 and feed end 108.Capacitive unit 102 is arranged between antenna body 106 and the ground plane 105.Specifically, antenna body 106 comprises the first frequency range branch 109 and the second frequency range branch 110.Capacitive unit 102 comprises first capacitive unit 111 and second capacitive unit 112, first capacitive unit 111 is arranged between the ground plane 105 of the open end of the first frequency range branch 109 and printed circuit board (PCB), and second capacitive unit 112 is arranged between the ground plane 105 of the open end of the second frequency range branch 110 and printed circuit board (PCB).First capacitive unit 111 and second capacitive unit 112 are respectively first sheet metal and second sheet metal.The positive pole of diode 104 connects first capacitive unit 111 and second capacitive unit 112, and the negative pole of diode 104 connects the ground plane 105 of printed circuit board (PCB), and the control signal output of control chip 103 connects the positive pole of diode 104.
It should be noted that those skilled in the art can select other patch conductor as capacitive unit 102 fully, realize capacitive unit 102 and 101 couplings of PIFA antenna.In addition, those skilled in the art can replace diode 104 by other switches between ground plane 105 and the capacitive unit 102 fully, and the conducting by control chip 103 control respective switch or disconnect controls the couple state of capacitive unit 102 and PIFA antenna 101, to change the resonance frequency of PIFA antenna 101.
To describe the concrete course of work of this multiband mobile phone below in detail:
Control chip 103 by the positive pole at diode 104 arrange dc offset voltage control diode conducting and by.When bias voltage is high voltage, diode 104 conductings, ground plane 105 short circuits of capacitive unit 102 and printed circuit board (PCB); When bias voltage was low-voltage, diode 104 was by, the ground plane of capacitive unit 102 and printed circuit board (PCB) 105 open circuits, and capacitive unit 102 is unsettled.
In the present embodiment, the open end of the position of capacitive unit 102 and PIFA antenna 101 overlaps, wherein, the open end place of PIFA antenna 101, radio-frequency current is zero, rf electric field intensity maximum forms capacitive coupling efficiently with capacitive unit 102.
When bias voltage was low-voltage, capacitive unit 102 was unsettled, and capacitive unit 102 and PIFA antenna 101 are weak coupling, the resonance frequency of PIFA antenna 101 does not change, the equivalent circuit diagram of PIFA antenna 101 as shown in Figure 2, at this moment, the resonance frequency f of PIFA antenna 101 0For:
f 0 = 1 2 π L a C a ;
Wherein, L aEquivalent inductance when being PIFA antenna 101 resonance; C aEquivalent capacity when being PIFA antenna 101 resonance; R aRadiation resistance when being PIFA antenna 101 resonance.
When bias voltage was high voltage, the ground plane 105 of capacitive unit 102 and printed circuit board (PCB) was connected, and capacitive unit 102 and PIFA antenna 101 are close coupling, and the resonance frequency of PIFA antenna 101 changes, and is relevant with the characteristic of capacitive unit 102.The equivalent electric circuit of PIFA antenna 101 as shown in Figure 3, at this moment, the resonance frequency f of PIFA antenna 101 1For:
f 1 = 1 2 π L a ( C a + C p ) ;
Wherein, L aEquivalent inductance when being PIFA antenna 101 resonance; C aEquivalent capacity when being PIFA antenna 101 resonance; R aRadiation resistance when being PIFA antenna 101 resonance; C PIt is the equivalent capacity of capacitive unit 102 and PIFA antenna 101.
C PFor:
C p＝Aε r/d；
Wherein, A is the area of capacitive unit 102; D is the spacing of capacitive unit 102 and PIFA antenna 101; ε rIt is the dielectric constant between capacitive unit 102 and the PIFA antenna 101.
In the present embodiment, the working frequency range of the first frequency range branch 109 is at GSM900, the working frequency range of the second frequency range branch 110 is at PCS1900, and correspondence arranges first capacitive unit 111 and second capacitive unit 112 respectively, and control chip 103 is controlled diode 104 according to the requirement of working frequency range.In the time of diode 104 conductings, first capacitive unit 111 and 109 couplings of the first frequency range branch, second capacitive unit 112 and 110 couplings of the second frequency range branch, the working frequency range of PIFA antenna 101 is at GSM850 and DCS1800; When diode 104 by the time, first capacitive unit 111 and the first frequency range branch 109 do not have coupling, second capacitive unit 112 and the second frequency range branch 110 do not have coupling, the working frequency range of PIFA antenna 101 is at GSM900 and PCS1900.This multiband mobile phone satisfies four kinds of working frequency range.Certainly, those skilled in the art can expect that fully a frequency range branch only is set and a capacitive unit realizes the two-band mobile phone.In addition, those skilled in the art it will also be appreciated that capacitive unit is arranged on other positions.
By the way, mobile phone of the present invention can satisfy the demand of mobile phone multiband work by the couple state of control capacitive unit and PIFA antenna, have simple in structure, cost is low and advantage such as saving space.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.

Claims (10)

1. multiband mobile phone, described multiband mobile phone comprises the PIFA antenna, it is characterized in that, described multiband mobile phone further comprises capacitive unit and control chip, the antenna body parallel interval of described capacitive unit and described PIFA antenna arranges, and the open end of the position of described capacitive unit and described PIFA antenna overlaps, and described control chip is controlled the couple state of described capacitive unit and described PIFA antenna, to change the resonance frequency of described PIFA antenna.
2. multiband mobile phone according to claim 1, it is characterized in that: described multiband mobile phone further comprises ground plane and switch, described switch is connected between described ground plane and the described capacitive unit, and described control chip is controlled described switch conduction or disconnection.
3. multiband mobile phone according to claim 2, it is characterized in that: described switch is diode.
4. multiband mobile phone according to claim 3, it is characterized in that: the positive pole of described diode connects described capacitive unit, and the negative pole of described diode connects described ground plane, and the control signal output of described control chip connects the positive pole of described diode.
5. multiband mobile phone according to claim 2, it is characterized in that: described PIFA antenna comprises described antenna body and the earth terminal and the feed end that are connected with described antenna body, and described capacitive unit is arranged between described antenna body and the described ground plane.
6. multiband mobile phone according to claim 5, it is characterized in that: described capacitive unit is patch conductor.
7. multiband mobile phone according to claim 5, it is characterized in that: described antenna body comprises the first frequency range branch and the second frequency range branch, and described capacitive unit comprises first capacitive unit and second capacitive unit, described first capacitive unit is arranged between the described first frequency range branch and the described ground plane, and described second capacitive unit is arranged between the described second frequency range branch and the described ground plane.
8. multiband mobile phone according to claim 7, it is characterized in that: described first capacitive unit is arranged between the open end and described ground plane of the described first frequency range branch, and described second capacitive unit is arranged between the open end and described ground plane of the described second frequency range branch.
9. multiband mobile phone according to claim 8, it is characterized in that: described first capacitive unit and described second capacitive unit are patch conductor.
10. multiband mobile phone according to claim 2, it is characterized in that: described switch is triode or metal-oxide-semiconductor.
CN2011100285341A 2011-01-26 2011-01-26 Multi-frequency band mobile phone Active CN102158245B (en)

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Publication number Priority date Publication date Assignee Title
CN103403962B (en) 2012-10-17 2016-10-26 华为终端有限公司 Multimode broadband antenna module and wireless terminal
CN103138043B (en) * 2013-01-28 2015-08-12 瑞声精密制造科技(常州)有限公司 Antenna modules and mobile terminal thereof

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Publication number Priority date Publication date Assignee Title
US20020180650A1 (en) * 2001-04-02 2002-12-05 Ilkka Pankinaho Optimal use of an electrically tunable multiband planar antenna
US6515625B1 (en) * 1999-05-11 2003-02-04 Nokia Mobile Phones Ltd. Antenna
US6518922B1 (en) * 1998-05-19 2003-02-11 Robert Bosch Gmbh Antenna arrangement and radio device
CN1866619A (en) * 2005-05-16 2006-11-22 中兴通讯股份有限公司 PIFA antenna with LC resonant circuit and implementing method thereof
CN101288203A (en) * 2005-10-14 2008-10-15 脉冲芬兰有限公司 Adjustable antenna

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Publication number Priority date Publication date Assignee Title
JP2004253943A (en) * 2003-02-19 2004-09-09 Intelligent Cosmos Research Institute Antenna system
JP2006086630A (en) * 2004-09-14 2006-03-30 Matsushita Electric Ind Co Ltd Antenna system and terminal for mobile communication
JP2006319477A (en) * 2005-05-10 2006-11-24 Yokowo Co Ltd Composite antenna

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US6518922B1 (en) * 1998-05-19 2003-02-11 Robert Bosch Gmbh Antenna arrangement and radio device
US6515625B1 (en) * 1999-05-11 2003-02-04 Nokia Mobile Phones Ltd. Antenna
US20020180650A1 (en) * 2001-04-02 2002-12-05 Ilkka Pankinaho Optimal use of an electrically tunable multiband planar antenna
CN1866619A (en) * 2005-05-16 2006-11-22 中兴通讯股份有限公司 PIFA antenna with LC resonant circuit and implementing method thereof
CN101288203A (en) * 2005-10-14 2008-10-15 脉冲芬兰有限公司 Adjustable antenna

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Address after: Songnan Village (Industrial Park), Shaxi Town, Taicang City, Suzhou City, Jiangsu Province

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Patentee before: Suzhou Shenyi packaging materials Co.,Ltd.

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