CN1564375A - Method of controlling double-frequency microband antenna resonance frequency - Google Patents
Method of controlling double-frequency microband antenna resonance frequency Download PDFInfo
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- CN1564375A CN1564375A CN 200410017539 CN200410017539A CN1564375A CN 1564375 A CN1564375 A CN 1564375A CN 200410017539 CN200410017539 CN 200410017539 CN 200410017539 A CN200410017539 A CN 200410017539A CN 1564375 A CN1564375 A CN 1564375A
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Abstract
U shape narrow gap is in 0.003 wavelength region, and the gap is near to radiation edge of antenna. Two arms are parallel to direction of current. Two-frequency operation of antenna and simple control for frequency is implemented through loading U shape gap and figure of paster in H shape. Advantages of the invention are adjusting two frequency ranges easily, reduced size of antenna.
Description
Technical field
The present invention relates to a kind of control method of antenna resonant frequency, be specifically related to a kind of method of controlling the double-frequency micro-strip antenna resonance frequency.Be used for wireless communication technology field.
Background technology
The develop rapidly of Modern wireless communication technology is more and more higher to the requirement of antenna.Microstrip antenna is with its low profile, in light weight, low-cost and be easy to advantages such as manufacturing and more and more studied and use.The communication system that is operated in two or more frequency ranges simultaneously is an important directions of radio communication development, so double frequency (or multifrequency) microstrip antenna becomes the focus of microstrip antenna Recent study and use.In order to make the microstrip antenna two-frequency operation, can realize by following several method usually: many pasters, slit load, lamped element loads (comprising the short circuit pin).Back dual mode is collectively referred to as resistance again and loads.Many pasters and lamped element load the structure that all can make antenna and become complicated, and the slit loads as a kind of simple load mode, can realize double frequency on the single layer microstrip antenna, and it is simple relatively to make production, and is easy to microwave circuit integrated.Produce the seam shape that the double frequency effect adopted and can be rectangle, U-shaped etc., can realize the variation of high and low frequency by the parameter that changes the slit, the frequency ratio that realizes certain limit is to adapt to the requirement of different communication systems.But difficult for two accurate control ratios of resonance frequency in design process, because these two frequencies are interactional often.Modification to the some parameters of antenna can make two resonance all change, can be for the designer because trial repeatedly just can obtain resonance frequency relatively accurately, and this process of debugging repeatedly makes the design cycle elongated, has increased design cost.
Find by literature search, " by the Dual-frequency Patch Antennas of two U-shaped slits loadings " (A dual-band patch antenna with twoU-shaped slots that Y.X.Guo etc. deliver on " microwave and optical tech wall bulletin ", Microwave Optical Technology Letters, 2000,26 (2): 73-75.), this article proposes to load the U-shaped slit on rectangular patch method realizes the two-frequency operation of antenna, and can realize control to two resonance frequencys by the parameter that changes the slit.But the variation of slot parameter can make two resonance frequencys change simultaneously in the method, like this design work is still relatively wasted time and energy.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of method of controlling the double-frequency micro-strip antenna resonance frequency is proposed, by changing wherein relevant parameters, make it can realize independent adjusting very easily, and obtain frequency ratio in a big way high frequency, low-frequency resonant frequency.This method is applied to the double frequency rectangular microstrip antenna can accelerates desin speed greatly among must designing and debug, reduce design cost.
The present invention is achieved by the following technical solutions, the slit of U-shaped is narrow, general scope at 0.003 wavelength, the U-shaped slit is near the radiating side of antenna, two arms are parallel to current direction, load and the patch shape of H shape realizes the two-frequency operation of antenna and to the simple control of frequency by the U-shaped slit.
Below the inventive method is done further to limit:
Change the higher order resonances frequency by the brachium that changes the U-shaped slit, when brachium extended, resonance frequency descended, otherwise raise.
By removing non-radiant edged last two equal and opposite in directions of rectangular patch, symmetrical rectangular block, can elongate path of current length.
The size of the size control low order resonance frequency of the mid portion by changing H shape paster, when the centre partly narrowed down, resonance frequency descended, otherwise raise.
The size of resonance frequency is subjected to the influence of independent parameter, the resonance frequency that is high order is subjected to the influence in U-shaped slit, the influence of the size of the mid portion that is subjected to H shape of low order, and the variation of these two parameters is very little to the other side's influence, that is to say to regulate independently.Thereby make the determining to become accurately and be easy to control of resonance frequency.
Load by the U-shaped slit among the present invention and the patch shape of H shape realizes the two-frequency operation of antenna and to the simple control of frequency, the while can further reduce the size of antenna.Compare with prior art, the inventive method has following advantage:
1) two of antenna frequency ranges can be regulated very easily.Because determine very little of influence between the antenna parameter of two available resonance band, therefore can shorten the design cycle by reaching the purpose of determining two resonance frequencys respectively to their adjusting respectively.
2) size of antenna reduces greatly.Because adopted the profile of H shape, elongated the current path of antenna surface, thereby made the low order resonance frequency of antenna reduce.Reached the purpose of dwindling antenna size.
Description of drawings
Fig. 1 is that rectangular patch of the present invention is specifically used schematic diagram
Fig. 2 is a fixed L among the embodiment
m=8mm, f
10, f
30And f
30/ f
10The variation schematic diagram
Fig. 3 is fixing d=18mm among the embodiment, f
10, f
30And f
30/ f
10The variation schematic diagram
Embodiment
As shown in the figure, in conjunction with content of the present invention, be example with the rectangular microstrip antenna of coaxial feed form, technical solution of the present invention is done further to understand, be suitable for this method equally for antenna by the little band forms feed in side.Specific as follows:
1, the size of rectangular microstrip antenna is W * L, and wherein the limit of W correspondence is the radiating side of antenna, and L is the current length of fundamental resonance pattern, removes two rectangles on the L limit, makes the mid portion of antenna become d * s, and antenna has become H shape.H-aerial has elongated the last path of current of original rectangular patch antenna, has reduced the resonance frequency of antenna, and antenna size is dwindled a lot.Under the situation that the overall size of antenna is fixed, when not adding the slit, can change the resonance frequency of antenna by the size that changes d.
2, in the place near two radiating side of paster, symmetry adds two U-shaped slits, and width is W
s, the length in slit is 2L
m+ L
s, wherein two brachiums are L
m, be L along the length of short side direction
s, and the distance of clearance distance paster up-and-down boundary is d
1, the distance on border, the left and right sides is d
2, two U-shaped gap size equate and about the longitudinal axis symmetry of antenna.Adding that near the radiating side of conventional squaerial two rectangles or U-shaped slit just can produce the effect of double frequency, wherein mainly is the TM that utilizes antenna
10And TM
30Two kinds of modes of resonance are because TM
20Antenna pattern arranged, and TM bigger zero point
10And TM
30Radiation characteristic similar.The dielectric constant of microstrip antenna used medium is ε
r, thickness is h.
3, since near the U-shaped slit of paster radiating side to TM
10The influence that mode current distributes is very little, so f
10Depend primarily on the geometric shape of original H-aerial, therefore can change f by the size that changes d
10Opposite TM
30The CURRENT DISTRIBUTION of pattern is subjected to the influence of d size less relatively, and near its electric current the U-shaped slit is concentrated relatively, is subjected to L
mInfluence relatively large, so can be by changing L
mSize change f
30Like this, Antenna Design person just can regulate f respectively by a parameter that only changes antenna
10And f
30Thereby two frequencies having avoided often occurring in other dual-band antenna designs interact and the shortcoming of very difficult adjusting and control, make that the design of dual-band antenna is more convenient and quick.
Specific embodiment below is provided:
Concrete parameter is as follows: W=42mm, L=70mm, W
s=d
1=d
2=1mm, s=34mm, L
s=38mm, d=21mm, L
m=8mm, d
f=6.5mm, ε
r=2.8, h=2mm, fixed L respectively
mA value with among the d changes another one then, can obtain the frequency and the frequency ratios of different sizes, its result as shown in Figure 2, fixed L
mLength equal 8mm, d changes to 42mm from 10mm.Among Fig. 3, fixedly to equal 18mm constant for the length of d, and L
mChange to 10mm from 2mm, other parameters of antenna are simultaneously: W=42mm, L=70mm, W
s=d
1=d
2=1mm, s=34mm, L
s=38mm, ε
r=2.8, h=2mm, when changing above parameter, for impedance matching need change the size of df, the position of distributing point just, but keep distributing point on axis of pitch.Find to arrive between several mm by actual measurement, can obtain impedance matching preferably at distance paster central point 1mm.As can be seen from the figure, fixed L
m=8mm changes d, can obtain frequency ratio 1.845-1.998, can find f simultaneously
30And f
10It is very little to compare variation; Fixedly d=18mm changes L
m, obtaining frequency ratio is 1.88-2.296, at this moment f
30Alter a great deal and f
10Substantial constant.That is to say two resonance frequencys that the size of the brachium that can be by changing the U-shaped slit and the mid portion of H shape paster is come control antenna.In the actual design process, the designer can regulate d and L simultaneously in designing antenna
m, because both almost are independently to the influence of respective frequencies, this brings very big flexibility to design debug.
Claims (5)
1, a kind of method of controlling the double-frequency micro-strip antenna resonance frequency, it is characterized in that, the slit of U-shaped is narrow, scope at 0.003 wavelength, the U-shaped slit is near the radiating side of antenna, two arms are parallel to current direction, load and the patch shape of H shape realizes the two-frequency operation of antenna and to the simple control of frequency by the U-shaped slit.
2, the method for control double-frequency micro-strip antenna resonance frequency according to claim 1 is characterized in that, changes the higher order resonances frequency by the brachium that changes the U-shaped slit, and when brachium extended, resonance frequency descended, otherwise raise.
3, the method for control double-frequency micro-strip antenna resonance frequency according to claim 1 is characterized in that, by removing two equal and opposite in directions of rectangular patch on non-radiant edged, symmetrical rectangular block, elongates path of current length.
4, the method for control double-frequency micro-strip antenna resonance frequency according to claim 1 is characterized in that, the size that changes the mid portion of H shape paster is controlled the size of low order resonance frequency, and when the centre partly narrowed down, resonance frequency descended, otherwise raise.
5, according to the method for claim 1 or 2 or 4 described control double-frequency micro-strip antenna resonance frequencys, it is characterized in that, the size of resonance frequency is subjected to the influence of independent parameter, the resonance frequency of high order is subjected to the influence in U-shaped slit, the influence of the size of the mid portion that is subjected to H shape of low order, and the variation of these two parameters is very little to the other side's influence, independently regulates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017539 CN1564375A (en) | 2004-04-08 | 2004-04-08 | Method of controlling double-frequency microband antenna resonance frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410017539 CN1564375A (en) | 2004-04-08 | 2004-04-08 | Method of controlling double-frequency microband antenna resonance frequency |
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| Publication Number | Publication Date |
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| CN1564375A true CN1564375A (en) | 2005-01-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1937313B (en) * | 2006-10-12 | 2011-04-20 | 上海交通大学 | Double frequency antenna unit for mobile terminal and low-coupling multi-antenna comprising same |
| CN101593867B (en) * | 2009-07-06 | 2012-05-30 | 北京航空航天大学 | Optimization method for miniaturization of pole antenna and miniature arched antenna |
| CN101529651B (en) * | 2006-09-15 | 2013-03-27 | 莱尔德技术股份有限公司 | Stacked patch antennas |
| CN103560316A (en) * | 2013-11-04 | 2014-02-05 | 北京邮电大学 | Dual-frequency broadband differential antenna |
| CN112542688A (en) * | 2020-11-27 | 2021-03-23 | 歌尔科技有限公司 | Microstrip antenna and terminal equipment |
| CN117525899A (en) * | 2023-10-27 | 2024-02-06 | 深圳市飞宇信电子有限公司 | Dual-band 5G microstrip antenna |
-
2004
- 2004-04-08 CN CN 200410017539 patent/CN1564375A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529651B (en) * | 2006-09-15 | 2013-03-27 | 莱尔德技术股份有限公司 | Stacked patch antennas |
| CN1937313B (en) * | 2006-10-12 | 2011-04-20 | 上海交通大学 | Double frequency antenna unit for mobile terminal and low-coupling multi-antenna comprising same |
| CN101593867B (en) * | 2009-07-06 | 2012-05-30 | 北京航空航天大学 | Optimization method for miniaturization of pole antenna and miniature arched antenna |
| CN103560316A (en) * | 2013-11-04 | 2014-02-05 | 北京邮电大学 | Dual-frequency broadband differential antenna |
| CN103560316B (en) * | 2013-11-04 | 2015-07-15 | 北京邮电大学 | Dual-frequency broadband differential antenna |
| CN112542688A (en) * | 2020-11-27 | 2021-03-23 | 歌尔科技有限公司 | Microstrip antenna and terminal equipment |
| CN117525899A (en) * | 2023-10-27 | 2024-02-06 | 深圳市飞宇信电子有限公司 | Dual-band 5G microstrip antenna |
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