CN200979907Y - A novel built-in antenna system for a mobile phone - Google Patents
A novel built-in antenna system for a mobile phone Download PDFInfo
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- CN200979907Y CN200979907Y CN 200620148273 CN200620148273U CN200979907Y CN 200979907 Y CN200979907 Y CN 200979907Y CN 200620148273 CN200620148273 CN 200620148273 CN 200620148273 U CN200620148273 U CN 200620148273U CN 200979907 Y CN200979907 Y CN 200979907Y
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Abstract
The utility model discloses a novel mobile phone IFA internal antenna device, wherein a radiator is directly printed on a main board, the signal is fed from a radio frequency front end of the mobile phone, portion of the radiator is parallel short-circuit connected with the ground, a winding current at different lengths is generated according to the shape of the radiator and the mutually coupling between vibrators, to generate different frequency bands. The antenna provided on any standard mobile phone has the same height as the main board, the length and the relative location of the antenna vibrator can be adjusted, to realize double-frequency, three-frequency and broad band via changing current. Compared with general internal antennas, the utility model has stronger index stability and higher property, compared with common monopole antenna, the antenna of the utility model has higher radioactive resistance, and compared with ordinary PIFA antenna, the utility model can save space.
Description
Technical field
The utility model belongs to the mobile communication terminal technical field, relates generally to a kind of Built-in antenna apparatus of new type superthin mobile phone IFA type.
Background technology
The fast development of mobile communication effectively promoting mobile phone to miniaturization, and the high-performance direction develops.
Up to the present, radio frequency (RF) partly, baseband portion realized that all very the IC of high level is integrated, effectively promoted the miniaturization of portable terminal, low cost.And mobile phone antenna because the further high request of moulding and radio-frequency performance has also proposed unprecedented challenge to Antenna Design teacher, can satisfy demand handsome in appearance, also will satisfy frequency bandwidth and efficiency index.
Mobile phone is as a kind of environment for use portable terminal complicated and changeable, and what designer's demand side was right is how to overcome variety of issue to make antenna performance the best, and these problems comprise:
The moulding of mobile phone is to the requirement of antenna size and position;
The proximity effect of mobile phone circuit assembly;
The cellphone subscriber uses in the building of being everlasting or in the car, to the requirement of antenna directivity;
When human body carried mobile phone, human body sensing was to the requirement of the influence of antenna generation.
The appearance of built-in antenna of mobile phone makes moulding that very big breakthrough arranged, but the requirement that the influence to the antenna index that built-in aerial brought reaches the complete machine layout also is the problem that each mobile-phone manufacturers faced.
Built-in aerial has two kinds of forms at present: monopole (monopole antenna) and planar inverted-F antenna (PIFA), quarter-wave monopole is basic portable antenna, the PIFA antenna prototype is the typical flat plane antenna of falling F, radiation patch produces the bypass current of different length by shape, thereby forms different frequency ranges.The basic comprising method of antenna is: the quarter-wave aerial that will be installed on the ground level becomes the L type, and a bit carries out feed what depart from mounting points.Select suitable distributing point just to be easy to realize impedance matching to antenna.
When using conventional PIFA antenna, antenna need be respectively apart from mainboard radome height for reaching needed frequency bandwidth and radiation efficiency: about CDMA and GSM frequency range 8mm, about PHS frequency range 6mm.And when using the monopole built-in aerial, it need be placed on away from metal, the place of device, because antenna is to the existence of the coupling capacitance of adjacent devices, can have a strong impact on radiation efficiency, need mainboard to leave clean zone of antenna for, this just needs complete machine to do coupling usefulness for its very big block space, to increase antenna reactance, produce frequency bandwidth.These requirements are unfavorable for that all mobile phone develops to miniaturization, ultrathin direction.
Summary of the invention
The purpose of this utility model designs a kind of novel inverse-F antenna (IFA) exactly, this antenna can either be optimized the built-in aerial electrical property can reduce conventional height of present built-in aerial and space again, thereby it is ultra-thin that the built-in aerial mobile phone can be realized in shape-designing, realizes multifrequency on the performance.
In the built-in miniature antenna in basic plane is analyzed, can see that because the diminishing of size, antenna radiation resistance obviously diminishes or because the equivalent electric resistance is big, thereby has caused the mismatch of antenna.General way is to improve coupling at the matching network that the antenna front end inserts lumped parameter, but under upper frequency, the Q value of matching network is very low, thereby has introduced bigger insertion loss, has reduced the efficient of antenna.We need find suitable distributed architecture so that the electronically small antenna coupling.
Antenna assembly of the present utility model is that radiator directly is printed on the mainboard, and signal is by the mobile phone front end feed-in, the short circuit in parallel with ground of a radiator part.Meander line has constituted two different resonant tanks with short oscillator, and wherein the length of the short oscillator of the high-frequency resonant frequency correspondence free space wavelength corresponding with it is directly proportional, and is inversely proportional to the dielectric constant of material.The length of the meander line of low-frequency resonant frequency correspondence is also relevant with the LVFS of meander line.Antenna produces the bypass current of different length according to intercoupling between radiator shape and oscillator, thereby produces different frequency range.
The utility model built-in aerial can be flat high with mainboard on the mobile phone of any standard.
When determining the length of meander line, the LVFS of meander line generally is taken as about 35%.
The utility model built-in aerial can be realized double frequency, three frequency and broadbands by the relative position of adjusting meander line with length, meander line and the short oscillator of short oscillator.Described meander line can be long oscillator or other type.
The antenna that directly is printed on the mainboard at present is the unipole antenna form, and its below does not have ground, although reduced the height of antenna, one pole form antenna is to mainboard processing requirements harshness peripherally.With the existing antenna technology contrast that is printed on the mainboard, the utility model IFA antenna can be adjusted grounding leg and reduce peripherally influence to antenna, and contrast one pole form antenna can effectively improve radiation resistance.
Antenna structure of the present utility model is compared with inverse-F antenna, it is advantageous that must there be the ground of strict distance the desired antenna of no inverse-F antenna below, can accomplish concordantly with mainboard, has reduced the height of antenna.
The utility model antenna can change Current Control by regulating length, the relative position of antenna oscillator, thereby realizes double frequency, three frequency and broadbands.
Description of drawings
Fig. 1 is L shaped antenna diagram.
Fig. 2 is the impedance chart of L shaped antenna.
Fig. 3 is the admittance chart of L shaped antenna.
Fig. 4 is that L shaped antenna adds shorted to earth and props up figure.
Fig. 5 is the structural representation of the utility model first embodiment antenna.
Fig. 6 is the structural representation of the utility model second embodiment antenna.
Embodiment
Further describe the utility model below in conjunction with drawings and Examples.
At first, we study the coupling of L shaped antenna, and L shaped antenna as shown in Figure 1.Observe Smith (Smith) circle diagram of L shaped antenna: impedance chart as shown in Figure 2, admittance chart is as shown in Figure 3.We can see that first resonance point is the basic mode frequency of antenna, are admissible match points.Can see that antenna has bigger capacitive reactance when f＜f0, we can increase antenna parallel reactance over the ground by adding the mode that short circuit props up over the ground, thereby increase the real part of input impedance, as shown in Figure 4.
On above-mentioned research basis, the built-in antenna of mobile phone device of the utility model design directly is printed on radiator on the mainboard, and signal is by the mobile phone front end feed-in, the short circuit in parallel with ground of a radiator part.Meander line and short oscillator constitute two different resonant tanks, and wherein the length of the short oscillator of the high-frequency resonant frequency correspondence free space wavelength corresponding with it is directly proportional, and are inversely proportional to the dielectric constant of material.The length of the meander line of low-frequency resonant frequency correspondence is also relevant with the LVFS of meander line.Antenna produces the bypass current of different length according to intercoupling between radiator shape and oscillator, thereby produces different frequency range.
Particularly, radiator comprises that first radiator 4 and second radiator, 5, the first radiators 4 both can do signal input port with second radiator 5 and also can do ground connection connection, and one of them is connected with the radiofrequency signal mouth, another is connected with mainboard ground, realizes the short circuit in parallel with ground of a radiator part.
Fig. 5 and Fig. 6 are two kinds of different structures of the built-in antenna of mobile phone device designed according to the utility model.Fig. 5 is pure two oscillator structures, and the antenna that is come out by antenna feed point separates two-way, and meander line 2 is realized low frequency, and short oscillator 3 is realized high frequency, and the position of meander line 2 and short oscillator 3 can exchange adjusting.Fig. 6 is a kind of structure of antenna integrated design, also is appreciated that into short oscillator 3, meander line 2, but meander line 2 and short oscillator 3 are not separated into two branch roads, and this kind structure realizes double frequency by the reverse current that detours in the oscillator.
Referring to Fig. 5 and Fig. 6, meander line 2 has constituted two different resonant tanks with short oscillator 3, wherein the length of the short oscillator 3 of high-frequency resonant frequency correspondence
λ is the free space wavelength of high-frequency resonant frequency correspondence, and ε γ is the dielectric constant of material; The length of the meander line 2 of low-frequency resonant frequency correspondence
λ is the free space wavelength of low-frequency resonant frequency correspondence, and SR represents the LVFS of meander line, and generally getting LVFS is about 35%, and ε γ is the dielectric constant of material.Select appropriate structural parameters and material dielectric constant, can obtain corresponding antenna assembly.Wherein, this meander line 2 is long oscillators, can certainly be other type.
Said antenna device produces the bypass current of different length according to intercoupling between radiator shape and oscillator, thereby produces different frequency range.By the relative position of adjusting meander line 2, can realize double frequency, three frequency and broadbands with length, meander line 2 and the short oscillator 3 of short oscillator 3.
The utility model utilizes the IFA antenna can effectively improve radiation resistance.Two kinds of IFA antenna structures of the present utility model are compared with inverse-F antenna, it is advantageous that must there be the ground of strict distance the desired antenna of no inverse-F antenna below, can accomplish concordantly with mainboard, have reduced the height of antenna.This structure directly application of printed need not structural member and mounting process on mainboard.
Claims (9)
1, a kind of novel mobile phone Built-in antenna apparatus comprises radiator, oscillator and mainboard, it is characterized in that: radiator directly is printed on the mainboard (1), and signal is by the mobile phone front end feed-in, the short circuit in parallel with ground of a radiator part; Meander line (2) has constituted two different resonant tanks with short oscillator (3), wherein the length free space wavelength corresponding with it of the short oscillator (3) of high-frequency resonant frequency correspondence is directly proportional, be inversely proportional to the dielectric constant of material, the length of the meander line (2) of low-frequency resonant frequency correspondence is also relevant with the LVFS of meander line; Thereby described antenna assembly produces different frequency range according to the bypass current that intercoupling between radiator shape and oscillator produces different length.
2, built-in antenna of mobile phone device according to claim 1, it is characterized in that: described radiator comprises first radiator (4) and second radiator (5), one of them is connected with the radiofrequency signal mouth, and another is connected with mainboard ground, realizes the short circuit in parallel with ground of a radiator part.
3, built-in antenna of mobile phone device according to claim 1 and 2 is characterized in that: the length of described short oscillator (3)
λ is the free space wavelength of high-frequency resonant frequency correspondence, and ε γ is the dielectric constant of material; The length of described meander line (2)
λ is the free space wavelength of low-frequency resonant frequency correspondence, and SR represents the LVFS of meander line, and generally getting LVFS is about 35%, and ε γ is the dielectric constant of material.
4, built-in antenna of mobile phone device according to claim 1 and 2 is characterized in that: described antenna is flat high with mainboard (1) on the mobile phone of any standard.
5, built-in antenna of mobile phone device according to claim 3 is characterized in that: described antenna is flat high with mainboard (1) on the mobile phone of any standard.
6, built-in antenna of mobile phone device according to claim 1 and 2 is characterized in that: length, the relative position of described meander line (2) and short oscillator (3) can be regulated, and realize double frequency, three frequency and broadbands by changing Current Control.
7, built-in antenna of mobile phone device according to claim 1 and 2 is characterized in that: described meander line (2) can be long oscillator or other type.
8, built-in antenna of mobile phone device according to claim 3 is characterized in that: described meander line (2) comes out to be split up into two-way with short oscillator (3) by antenna feed point.
9, built-in antenna of mobile phone device according to claim 3 is characterized in that: described meander line (2) is integrated with short oscillator (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620148273 CN200979907Y (en) | 2006-11-02 | 2006-11-02 | A novel built-in antenna system for a mobile phone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620148273 CN200979907Y (en) | 2006-11-02 | 2006-11-02 | A novel built-in antenna system for a mobile phone |
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| CN200979907Y true CN200979907Y (en) | 2007-11-21 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195127A (en) * | 2010-03-03 | 2011-09-21 | 神讯电脑(昆山)有限公司 | Double-frequency inverted-F-shaped antenna |
| CN102124584B (en) * | 2008-07-15 | 2013-07-24 | 盖尔创尼克斯有限公司 | Compact multiband antenna |
| CN103247856A (en) * | 2012-02-03 | 2013-08-14 | 联想移动通信科技有限公司 | Antenna device and mobile terminal |
| CN104321927A (en) * | 2012-05-17 | 2015-01-28 | 华为技术有限公司 | Wireless communication device with a multiband antenna, and methods of making and using thereof |
| CN104409851A (en) * | 2014-12-02 | 2015-03-11 | 成都深思科技有限公司 | Microstrip patch antenna |
| US9190719B2 (en) | 2011-03-03 | 2015-11-17 | Nxp B.V. | Multiband antenna |
| CN106299638A (en) * | 2016-05-20 | 2017-01-04 | 北京小鸟听听科技有限公司 | A kind of for surface-pasted antenna and design and production method thereof |
-
2006
- 2006-11-02 CN CN 200620148273 patent/CN200979907Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102124584B (en) * | 2008-07-15 | 2013-07-24 | 盖尔创尼克斯有限公司 | Compact multiband antenna |
| CN102195127A (en) * | 2010-03-03 | 2011-09-21 | 神讯电脑(昆山)有限公司 | Double-frequency inverted-F-shaped antenna |
| US9190719B2 (en) | 2011-03-03 | 2015-11-17 | Nxp B.V. | Multiband antenna |
| CN103247856A (en) * | 2012-02-03 | 2013-08-14 | 联想移动通信科技有限公司 | Antenna device and mobile terminal |
| CN104321927A (en) * | 2012-05-17 | 2015-01-28 | 华为技术有限公司 | Wireless communication device with a multiband antenna, and methods of making and using thereof |
| CN104321927B (en) * | 2012-05-17 | 2017-06-20 | 华为技术有限公司 | Wireless Telecom Equipment and its implementation with multiband aerial and the method for using |
| CN104409851A (en) * | 2014-12-02 | 2015-03-11 | 成都深思科技有限公司 | Microstrip patch antenna |
| CN106299638A (en) * | 2016-05-20 | 2017-01-04 | 北京小鸟听听科技有限公司 | A kind of for surface-pasted antenna and design and production method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071121 |
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| EXPY | Termination of patent right or utility model |