CN101471484A - Multi-frequency antenna - Google Patents
Multi-frequency antenna Download PDFInfo
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- CN101471484A CN101471484A CNA2007103013658A CN200710301365A CN101471484A CN 101471484 A CN101471484 A CN 101471484A CN A2007103013658 A CNA2007103013658 A CN A2007103013658A CN 200710301365 A CN200710301365 A CN 200710301365A CN 101471484 A CN101471484 A CN 101471484A
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Abstract
The invention relates to a multiband antenna, which comprises a grounding plane, a support base and a radiation metal section, wherein the grounding plane has a first short-circuit point and a second short-circuit point; the radiation metal section is attached on the surface of the support base and includes a first radiation metal wire, a radiation metal sheet, a second radiation metal wire and a parasitical radiation metal arm; one terminal of the first radiation metal wire serves as the feed-in terminal of the antenna, and the other terminal is electrically connected with the first short-circuit point of the grounding plane; the radiation metal sheet is electrically connected with one section of the first radiation metal wire; the second radiation metal wire is surrounded by the first radiation metal wire, and one terminal of the second radiation metal wire is electrically connected with the first radiation metal wire; and one terminal of the parasitical radiation metal arm is electrically connected with the second short-circuit point of the grounding plane.
Description
Technical field
The present invention relates to a kind of antenna for mobile phone, especially relate to a kind of multifrequency antenna that is fit to be built in the mobile phone.
Background technology
Along with the fast development of radio communication, in wireless communications products, the antenna role is more important.Especially under light, thin, short, little trend trend, the height of antenna will influence the value of a product, and be main kind of design with plate aerial or exposed unipole antenna mostly in this type of wireless communications products.The thickness of known dual-band mobile phone plate aerial approximately needs 7-10mm, as TW patent announcement number the 490th, No. 884 " double-frequency inverted F shape plate aerial and radiation sheet metal thereof ", it discloses a kind of have radiation sheet metal and system ground, and be used in the example of the built-in antenna for mobile phone of mobile communication system GSM (Global System for Moblie Commu-nications) and DCS (Digital Cellular System) dual frequency operation, make the mobile phone integral thickness surpass 10mm significantly.If we are applied in above-mentioned known antenna technology in the thin type mobile phone (about mobile phone thickness 10mm or littler), will face the excessive problem of thickness of antenna, and can't really satisfy the requirement of mobile phone thin typeization.
Be head it off in this area, change into more and adopt unipole antenna to design that to be subjected to the ground plane influence less owing to protrude in exposed unipole antenna outside the ground plane, therefore antenna thickness can be forced down to reach the application of thin type antenna for mobile phone.
Yet no matter be plate aerial or unipole antenna,, all only can cover the GSM850 operational frequency bands just usually at the GMS frequency band because it is limited to be applied to the design space of mobile phone inside; So mobile phone is used towards the multifrequency development now, and traditional planar inverted-f antenna or unipole antenna only can meet GSM/DCS double frequency demand mostly in limited space, be difficult for designing the antenna that meets the multiband application demand.
Summary of the invention
Demand in response to multifrequency antenna improves day by day, meet the antenna for mobile phone that multifrequency is used for providing, we propose a kind of multifrequency antenna, this antenna can be formed on the support base, the resonance mechanism of this antenna belongs to loop aerial, again with in position on the metal wire that is electrically connected match, can realize GSM850/900 (820～960MHz)/DCS (1710～1880MHz)/PCS (1850～1990)/UMTS (five operations frequently of 1920～2170MHz).Antenna of the present invention partly is the half-wavelength mode of resonance of loop aerial at low frequency, and this mode of resonance can contain the operational requirements of GSM850/900, and high frequency partly then is by the synthetic broadband operation of two modes of resonance, and concrete resonance mechanism will be introduced after a while.The bandwidth of the low frequency operational frequency bands of antenna of the present invention is about 140MHz (820～960MHz), can contain the operation of GSM850/900, and the bandwidth of high-frequency operation frequency band is about 460MHz (1700～2170), also can contain the operation of DCS/PCS/UMTS, the application demand of realistic cell phone system.
As mentioned above, the object of the present invention is to provide a kind of multiband antenna for mobile phone, this antenna not only can realize being applicable to the requirement of GSM850/900/DCS/PCS/UMTS operational frequency bands, and antenna structure of the present invention is simple, operation mechanism is clear and definite, has the industry using value.
Antenna of the present invention comprises: ground plane, support base and radiation metal portion.Ground plane has first short dot and second short dot; The shape of support base is roughly hexahedron, and its material can be plastic cement or pottery or Poly Foam or microwave base plate material; And above-mentioned radiation metal portion is attached to this support base surface, and this radiation metal portion comprises: first radiation metal wires, radiation sheet metal, second radiation metal wires and parasitic radiation metal arm.The shape of first radiation metal wires is roughly annular, and have first end points and second end points, this first end points feed side that is antenna wherein, in order to be connected to the rf signal line of cell phone system module, this second end points then is electrically connected to first short dot of this ground plane; Radiation sheet metal then is electrically connected to a section of this first radiation metal wires; The shape of second radiation metal wires is roughly L shaped, and is centered on by this first radiation metal wires, and an end points of second radiation metal wires is electrically connected to this first radiation metal wires; The shape of parasitic radiation metal arm also is roughly L shaped, and through once bending, and an end points of parasitic radiation metal arm is electrically connected to second short dot of this ground plane.
If antenna of the present invention is applied in the cell phone system, then ground plane is the system ground of mobile phone internal circuit, configurable system module and circuit element on it.
In the present invention, use the first radiation metal wires resonance to go out half-wavelength and the long mode of resonance (operating in 1000MHz and 1800MHz respectively) of all-wave, cooperate radiation sheet metal and parasitic radiation metal arm again, in order to prolong the equivalent resonant path of first radiation metal wires, the resonance frequency of first mode of resonance (half-wavelength mode) of the radiation metal wires of winning is descended, the 3rd mode of resonance that simultaneously also cooperates second radiation metal wires to provide is with the synthetic broadband operation of the all-wave long pattern of first radiation metal wires.
First mode of resonance of antenna of the present invention provides the bandwidth of operation of 140MHz, is enough to contain the operational requirements of GSM850/900; Second and third mode of resonance then merges the formation broadband operation, the operation frequency range that provides bandwidth to be about 460MHz, and can contain the operational requirements of DCS/PCS/UMTS.
(GSM850/900:824～960MHz, DCS/PCS/UMTS:1710～2170MHz) interior return loss all is higher than 6dB, realistic demands of applications to antenna provided by the present invention at the demand frequency band.Antenna designs provided by the present invention is simple simultaneously, and operation mechanism is clear and definite, is easy to reach the multifrequency demand via design; And the radiation metal portion that forms antenna can be attached to the support base surface, and the Antenna Design mode of this utilization surface mount technology can improve the convenience of antenna integral body and system circuit board integration, and therefore antenna of the present invention is the antenna with using value.
With reference to the accompanying drawings, by the detailed introduction of the embodiment of the invention, above and other objects of the present invention and advantage will be more apparent.
Description of drawings
Fig. 1 is the structure chart according to the antenna of the first embodiment of the present invention.
Fig. 2 is the structure chart according to the antenna of the second embodiment of the present invention.
Fig. 3 is the return loss test result according to the antenna of the first embodiment of the present invention.
Fig. 4 is the antenna pattern according to first mode of resonance (880MHz) of the antenna of the first embodiment of the present invention.
Fig. 5 is the antenna pattern according to second mode of resonance (1840MHz) of the antenna of the first embodiment of the present invention.
Fig. 6 is the antenna pattern according to the 3rd mode of resonance (2110MHz) of the antenna of the first embodiment of the present invention.
Fig. 7 is the low frequency operational frequency bands gain diagram according to the antenna of the first embodiment of the present invention.
Fig. 8 is the high-frequency operation band gain figure according to the antenna of the first embodiment of the present invention.
Fig. 9 is the structure chart according to the antenna of another kind of embodiment of the present invention.
Embodiment
Fig. 1 is the structure chart according to the multifrequency antenna 1 of the first embodiment of the present invention.Multifrequency antenna 1 comprises: ground plane 11, support base 12 and radiation metal portion 13.Above-mentioned ground plane 11 has first short dot 111 and second short dot 112; The shape of support base 12 is roughly hexahedron, and its material can be plastic cement or pottery or Poly Foam or microwave base plate material; Above-mentioned radiation metal portion 13 is attached on these support base 12 surfaces, and this radiation metal portion 13 comprises: first radiation metal wires 14, radiation sheet metal 15, second radiation metal wires 16 and parasitic radiation metal arm 17.The shape of first radiation metal wires 14 is roughly annular, and have first end points 141 and second end points 142, wherein this first end points 141 is the feed side of antenna, in order to connect the rf signal line 10 of cell phone system module, this second end points 142 then is electrically connected to first short dot 111 of this ground plane 11; 15 of radiation sheet metals are electrically connected to a section of this first radiation metal wires 14; The shape of second radiation metal wires 16 is roughly L shaped, and is centered on by this first radiation metal wires 14, and the end points 161 of second radiation metal wires 16 is electrically connected to this first radiation metal wires 14; And that the shape of parasitic radiation metal arm 17 also is roughly is L shaped, and through once bending, and its end points 171 is electrically connected to second short dot 112 of ground plane 11.
Above-mentioned antenna of the present invention, if be applied in the cell phone system, then this ground plane 11 is the system ground of mobile phone internal circuit, configurable system module and circuit element on it.The return loss test result of present embodiment as shown in Figure 3.
Fig. 2 is the structure chart according to the multifrequency antenna 2 of the second embodiment of the present invention.Multifrequency antenna 2 is identical substantially with structure according to the multifrequency antenna 1 of first embodiment, multifrequency antenna 2 according to second embodiment also comprises: ground plane 11, support base 12 and radiation metal portion 13, just the structure of radiation metal portion 13 is slightly different with the multifrequency antenna 1 of first embodiment, the radiation metal portion 13 of multifrequency antenna 2 does not have the parasitic radiation metal arm, and all the other are identical with the multifrequency antenna 1 of first embodiment.
Fig. 3 is the return loss experiment test result according to the multifrequency antenna 1 of the first embodiment of the present invention.The following size of this experimental selection is tested: ground plane 11 is of a size of 40 x 75mm
2, the antenna area occupied is 40 x10 x 5mm
3, this antenna is made of with the radiation metal portion 13 that is attached to these support base 12 surfaces support base (Poly Foam material) 12.Radiation metal portion 13 is the main body of antenna, mainly comprises first radiation metal wires 14, radiation sheet metal 15, second radiation metal wires 16 and parasitic radiation metal arm 17.First radiation metal wires 14 roughly encompasses an annular, live width is about 0.5mm, total length then is about 100mm, its two ends are respectively the feed side 141 and short-circuit end 142 of antenna, this feed side 141 is connected to rf signal line 10, and this short-circuit end 142 then is connected to first short dot 111 of ground plane 11; Radiation sheet metal 15 is of a size of 40 x 15mm
2, being bent into is the L shaped of 5mm highly, and is electrically connected to a section of this first radiation metal wires 14; The width of second radiation metal wires 16 is 5mm, and length is about 20mm, it is one L shaped that its shape is roughly, and by 14 of first radiation metal wires around, and the end points 161 of second radiation metal wires 16 is electrically connected to this first radiation metal wires 14 near on the position of feed side 141, and the distance of the feed side 141 of this end points dip distance antenna is less than 20mm; Parasitic radiation metal arm 17 is the metal arm of 1mm for width, and length is about 11mm, and through once bending, its end points 171 is electrically connected to second short dot 112 of this ground plane 11.Carry out practical operation and test according to this design size, because first radiation metal wires 14 is a loop configuration, it can produce a half-wavelength and the long mode of resonance of all-wave, and the centre frequency of these two modes of resonance lays respectively on 1000MHz and the 1800MHz; Cooperate this radiation sheet metal 15 and this parasitic radiation metal arm 17 (function of the two is all the equivalent resonant path that prolongs this first radiation metal wires) again, the resonance frequency of first mode of resonance (half-wavelength pattern) of this first radiation metal wires 14 is descended, this mode of resonance provides the bandwidth of operation of 140MHz, and is enough to contain the operational requirements of GSM850/900; 16 of second radiation metal wires provide the pattern of the additional resonance on the 2100MHz simultaneously, can merge with second mode of resonance (all-wave long pattern) of first radiation metal wires 14, the wideband bandwidth of operation that provides bandwidth to be about 460MHz, and can contain the operational requirements of DCS/PCS/UMTS.(GSM850/900:824～960MHz, DCS/PCS/UMTS:1710～2170MHz) interior return loss all is higher than 6dB, realistic demands of applications to antenna of the present invention at mobile phone application demand frequency band.
Fig. 4 is the antenna pattern of multifrequency antenna 1 on 880MHz according to first embodiment of the invention.As shown in the figure, by first radiation metal wires cooperate radiation sheet metal and parasitic radiation metal arm the two, the antenna pattern of the half-wavelength pattern that institute's resonance goes out, similar to traditional unipole antenna or the plate aerial antenna pattern when the frequency upper resonance, all be the antenna pattern of baked donut shape.
Fig. 5 is the antenna pattern of multifrequency antenna 1 on 1840MHz according to the first embodiment of the present invention.As shown in the figure, by first radiation metal wires cooperate radiation sheet metal and parasitic radiation metal arm the two, the antenna pattern of the all-wave long pattern that institute's resonance goes out, be subjected to the influence of the ground plane length (75mm) of antenna of the present invention, this antenna pattern is different with the butterfly-like antenna pattern of conventional mobile phone antenna resonance when 1800MHz goes up, on the x-y plane, do not have depression points, on this plane, have antenna pattern simultaneously near omnidirectional.
Fig. 6 is the antenna pattern of multifrequency antenna 1 on 2110MHz according to the first embodiment of the present invention.As shown in the figure, the antenna pattern of the 3rd mode of resonance that goes out by second radiation metal wires institute resonance, also because the ground plane length of antenna of the present invention is 75mm, thereby this antenna pattern is different with the butterfly-like antenna pattern of conventional mobile phone antenna resonance when 2000MHz goes up, in the x-y plane, do not have depression points, on this plane, have antenna pattern simultaneously yet near omnidirectional.The antenna pattern test result of complex chart 5 and the high-frequency resonant mode of Fig. 6 as can be known, the antenna pattern of antenna of the present invention and the conventional mobile phone antenna operation butterfly-like directional diagram when high frequency is compared, and has the advantage that reduces the antenna pattern depression points.
Fig. 7 is the antenna gain pattern of multifrequency antenna 1 in the low frequency operational frequency bands according to the first embodiment of the present invention, antenna gain in the GSM850/900 frequency band is about-2.7～-0.6dBi, and Fig. 8 is the antenna gain pattern in high frequency (DCS/PCS/UMTS) operational frequency bands, gain in the DCS/PCS/UMTS frequency band is about-1.7～3.5dBi, generally speaking all realistic demands of applications.In addition, antenna of the present invention is suitable for the mobile communication product of various different ground plane dimensions, and adopts 40 x 100mm in the size of ground plane
2The time, the antenna gain that is obtained can be higher.In addition with regard to the multifrequency antenna 2 of second embodiment, be different from slightly in its radiation metal portion 13 under the situation of multifrequency antenna 1 of first embodiment, if use 40 x 100mm
2Ground plane dimensions, also can obtain at least three modes of resonance, so that at least five frequently operations to be provided, realize the effect identical with the multifrequency antenna 1 of first embodiment.
Fig. 9 is the structure chart according to the antenna 9 of another kind of embodiment of the present invention.Overall structure according to the multifrequency antenna 1 of the antenna 9 of this embodiment and first embodiment is roughly the same, but the radiation metal portion of the antenna 9 of this embodiment is slightly different on CONSTRUCTED SPECIFICATION with the radiation metal portion of the multifrequency antenna 1 of first embodiment.Radiation metal portion according to the antenna 9 of present embodiment comprises: first radiation metal wires 14, radiation sheet metal 15, second radiation metal wires 16 and parasitic radiation metal arm 17; Wherein first radiation metal wires 14 is all similar to the multifrequency antenna 1 of first embodiment to configuration to the shape of radiation sheet metal 15, it is the straight line that is shaped as of second radiation metal wires 96, simultaneously parasitic radiation metal arm 97 also be rectilinear form (without bending), yet its configuration mode is still similar to the configuration mode of the multifrequency antenna 1 of first embodiment.Above-mentioned another kind of embodiment, also resonance goes out at least three modes of resonance smoothly, and at least five frequently operations are provided, and reaches the effect same with the multifrequency antenna 1 of first embodiment.
Comprehensive above-mentioned explanation, antenna of the present invention simple in structure, operation mechanism is clear and definite, but the radiation metal portion surface mount of forming antenna is on the support base surface, and the antenna design concept of this employing surface mount technology, can improve the whole convenience of integrating with system circuit board of antenna, therefore antenna of the present invention has very high industry using value.
The execution mode that the front is introduced only is preferred embodiment of the present invention, can not limit scope of the present invention thus.
Claims (9)
1. multifrequency antenna comprises:
Ground plane has a short dot at least;
Support base; And
Radiation metal portion is attached to this support base surface, and comprises:
First radiation metal wires is roughly annular, has first end points and second end points, this first end points feed side that is antenna wherein, and this second end points then is electrically connected to the short dot of this ground plane;
Radiation sheet metal is electrically connected to one of this first radiation metal wires section; With
Second radiation metal wires is centered on by first radiation metal wires, and an end points of second radiation metal wires is connected electrically on first radiation metal wires.
2. multifrequency antenna as claimed in claim 1, it is characterized in that, this ground plane has first short dot and second short dot, and second end points of this first radiation metal wires is connected electrically to first short dot of ground plane, and radiation metal portion has the parasitic radiation metal arm in addition, and an end points of this parasitic radiation metal arm is connected electrically to second short dot of ground plane.
3. multifrequency antenna as claimed in claim 1 is characterized in that, this ground plane is the system ground of mobile phone internal circuit.
4. multifrequency antenna as claimed in claim 1 is characterized in that, first end points of this first radiation metal wires is the feed side of antenna, and is connected to the rf signal line of cell phone system module.
5. multifrequency antenna as claimed in claim 1 is characterized in that, the material of this support base is to choose from the group of being made up of plastic cement, Poly Foam, pottery and microwave base plate material.
6. multifrequency antenna as claimed in claim 1 is characterized in that the shape of this support base is roughly hexahedron.
7. multifrequency antenna as claimed in claim 1 is characterized in that the shape of this second radiation metal wires is roughly L shaped.
8. multifrequency antenna as claimed in claim 1 is characterized in that, this second radiation metal wires be shaped as linear.
9. multifrequency antenna as claimed in claim 2 is characterized in that the shape of this parasitic radiation metal arm is roughly L shaped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007103013658A CN101471484B (en) | 2007-12-27 | 2007-12-27 | Multi-frequency antenna |
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| CN2007103013658A CN101471484B (en) | 2007-12-27 | 2007-12-27 | Multi-frequency antenna |
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| CN101471484A true CN101471484A (en) | 2009-07-01 |
| CN101471484B CN101471484B (en) | 2012-07-18 |
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| CN2007103013658A Active CN101471484B (en) | 2007-12-27 | 2007-12-27 | Multi-frequency antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544714A (en) * | 2010-12-08 | 2012-07-04 | 上海安费诺永亿通讯电子有限公司 | Folding small-sized broad-band antenna |
| CN104716431A (en) * | 2013-12-17 | 2015-06-17 | 展讯通信（上海）有限公司 | Multi-band antenna |
| CN105449335A (en) * | 2014-08-20 | 2016-03-30 | 联想(北京)有限公司 | Electronic device |
| CN106299614A (en) * | 2015-05-29 | 2017-01-04 | 宏碁股份有限公司 | Antenna structure |
| CN108023166A (en) * | 2016-11-04 | 2018-05-11 | 宏碁股份有限公司 | Mobile device |
| CN112909503A (en) * | 2021-01-19 | 2021-06-04 | 上海安费诺永亿通讯电子有限公司 | Intelligent wearable device antenna and design method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10143168A1 (en) * | 2001-09-04 | 2003-03-20 | Philips Corp Intellectual Pty | Circuit board and SMD antenna therefor |
| WO2004038859A1 (en) * | 2002-10-22 | 2004-05-06 | Sk Telecom Co., Ltd. | Independently tunable multiband meanderline loaded antenna |
| GB2403069B8 (en) * | 2003-06-16 | 2008-07-17 | Antenova Ltd | Hybrid antenna using parasiting excitation of conducting antennas by dielectric antennas |
| CN1812193B (en) * | 2005-01-25 | 2011-01-12 | 连展科技电子（昆山）有限公司 | Inverted-F antenna with double-branch, short-circuit structure |
-
2007
- 2007-12-27 CN CN2007103013658A patent/CN101471484B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544714A (en) * | 2010-12-08 | 2012-07-04 | 上海安费诺永亿通讯电子有限公司 | Folding small-sized broad-band antenna |
| CN104716431A (en) * | 2013-12-17 | 2015-06-17 | 展讯通信（上海）有限公司 | Multi-band antenna |
| CN104716431B (en) * | 2013-12-17 | 2018-01-05 | 展讯通信（上海）有限公司 | A kind of multifrequency antenna |
| CN105449335A (en) * | 2014-08-20 | 2016-03-30 | 联想(北京)有限公司 | Electronic device |
| CN106299614A (en) * | 2015-05-29 | 2017-01-04 | 宏碁股份有限公司 | Antenna structure |
| CN108023166A (en) * | 2016-11-04 | 2018-05-11 | 宏碁股份有限公司 | Mobile device |
| CN112909503A (en) * | 2021-01-19 | 2021-06-04 | 上海安费诺永亿通讯电子有限公司 | Intelligent wearable device antenna and design method thereof |
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| CN101471484B (en) | 2012-07-18 |
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