CN105449357B - A kind of knife-edge double frequency horizontally polarized omnidirectional antenna - Google Patents
A kind of knife-edge double frequency horizontally polarized omnidirectional antenna Download PDFInfo
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- CN105449357B CN105449357B CN201510923683.2A CN201510923683A CN105449357B CN 105449357 B CN105449357 B CN 105449357B CN 201510923683 A CN201510923683 A CN 201510923683A CN 105449357 B CN105449357 B CN 105449357B
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Abstract
The invention discloses a kind of knife-edge double frequency horizontally polarized omnidirectional antennas, including antenna house and antenna, the antenna is encapsulated in antenna house, the antenna includes antenna radiation unit and feed element, and the antenna radiation unit is the cuboid of bore face opening, and the bore face of opening is known as opening face, the feed element is located in antenna radiation unit, and positioned at the center of vertical direction, the feed element is gradual change form metal patch, and U-lag is provided on the gradual change form metal patch.The advantages that inventive antenna double-frequency resonance characteristic novel, size is smaller and directional diagram is stable, omni-directional is good, cross polarization is small, to realize frequency controllable simple in structure, high gain, it is suitable for mobile communication field.
Description
Technical field
The present invention relates to mobile communication field, more particularly to a kind of knife-edge double frequency horizontally polarized omnidirectional antenna.
Background technology
With the development of society, the progress of science and technology, wireless communication plays more and more important in people's lives
Effect, antenna are also developed rapidly as essential part in wireless communication.One side various wireless communication standard
System is simultaneously deposited；On the other hand, to meet the requirement of radio frequency system multiband, antenna is needed with multi-frequency Characteristic.Multifrequency antenna is not
It is only capable of meeting interpersonal a large amount of high speed information degree the needs of transmitting, and common antenna can be made to work in multiple communications
System frequency band realizes the miniaturization of communication equipment to reduce the number of antenna on carrier.The IEEE official definitions of in September, 2009
IEEE 802.11n standards, it is specified that：2.4-2.4835GHz being wireless WiFi working frequency range with 5.15-5.85GHz.WiFi is
The important component of WLAN, nowadays, WiFi technology have become people and live the essential communication technology, and antenna conduct
Essential part is wirelessly communicated, so the horizontally polarized omnidirectional antenna that research covers above-mentioned frequency range is very significant and must
It wants.
Horizontally polarized omnidirectional antenna refers to realizing 360 degree of homogeneous radiations in the horizontal plane, has certain wave beam wide in vertical plane
The antenna of degree, therefore the signal of its transmitting can be received by the receiving terminal of horizontal plane arbitrary orientation, while can receive each of horizontal plane
The signal in a direction is normally applied in a communications system in a wide range of covering, point-to-multipoint communication system.In daily life,
Omnidirectional antenna has been widely used for the occasions such as mobile communication, radio frequency identification, Channel Detection；Militarily, omnidirectional antenna is being defended
The fields such as star communication, radar sensor networks, spacecraft are also widely used.
In omnidirectional antenna it is common it is mostly be vertical polarization form, horizontal polarization it is few.Since horizontally-polarized antenna radiates
Electromagnetic wave and vertical polarization electromagnetic wave it is mutually orthogonal, can farthest reduce the electromagnetic wave that works with vertical polarization mode it
Between mutual interference, so as to make user obtain more clean radio signal.It was found that indoors in wireless communication system,
Transmitting terminal and receiving terminal all use the system of horizontally-polarized antenna than can be averaged using the system of vertical polarized antenna more
The power of 10dB.
Invention content
In order to overcome shortcoming and deficiency of the existing technology, the present invention to provide a kind of horizontally polarized omnidirectional day of knife-edge double frequency
Line.
This antenna is a kind of directional diagram stabilization, and simple in structure, and omni-directional is good, the low horizontally polarized omnidirectional day of cross polarization
Line can realize two frequency ranges of WiFi using individual antenna：2.4-2.4835GHz with 5.15-5.85GHz, and in each frequency range
Omnidirectional it is functional, so in the horizontal plane regardless of user move direction can ensure to cover.
The present invention adopts the following technical scheme that：
A kind of knife-edge double frequency horizontally polarized omnidirectional antenna, including antenna house and antenna, the antenna are encapsulated in antenna house
Interior, the antenna includes antenna radiation unit and feed element, and the antenna radiation unit is open rectangular for a bore face
The bore face of body, opening is known as opening face, and the feed element is a gradual change form metal patch for being provided with U-type groove, and
Inside antenna radiation unit.
The antenna house be knife-edge structure, the back side of the knife-edge structure and the opening face of cuboid it is coplanar and be open.
The gradual change form of the gradual change form metal patch is specially elliptical gradient, round gradual change or parabolic grades.
The U-lag is symmetrical about gradual change form metal patch transversal centerline, and the length of the U-lag is 0.3 λh-0.6
λh, the width of slot is 0.5mm-1mm, wherein λhFor antenna high band center resonant frequency fhCorresponding wave in free space
It is long.
The gradual change form metal patch is opened a way close to cuboid opening face one end, and other end midpoint is distributing point.
U-lag opening direction face distributing point in the feed element.
The length of gradual change form metal patch is 0.35 λh-0.75λh, gradual change form metal patch width is 0.2 λh-0.6
λh, wherein λhFor antenna high band center resonant frequency fhCorresponding wavelength in free space.
The opening face length and width of cuboid be respectively, 0.45 λL-0.7λL、0.08λL-0.23λL, the depth L of cuboid is
0.15λL-0.35λL, wherein λLFor antenna low-frequency range center resonant frequency fLCorresponding wavelength in free space.
Beneficial effects of the present invention：
(1) structure of the antenna is simply novel, and antenna house part is using streamline made of fiberglass reinforced plastics
The knife-edge structure of type, can be very good protection antenna radiator, using fairshaped knife structure aircraft system in-flight
Windage can be reduced.
(2) structure of the antenna is simply novel, and the cuboid opening face of radiator is to realize horizontally polarized omnidirectional radiation
Key, the length and width for adjusting the opening face can influence omnidirectional's performance of antenna.
(3) feeding line portion of the antenna, novelty simple in structure, and the feed section of the gradual change form with U-lag can coordinate
It carries on the back chamber cuboid radiation physical efficiency and realizes the good and controllable frequency double-frequency resonance pattern of matching.
(4) antenna can realize that WiFi double frequency-bands cover, and in the two frequency ranges all only with a radiating element
Good antenna pattern can be obtained, have good horizontally polarized omnidirectional performance, and cross polarization is very small, -40B with
Under；
(5) antenna is correspondingly small in size, simple in structure, is only consisted of two parts, molding easy to process；
(6) antenna structure is simple, is only made of metal, and processing cost is low；
(7) gain of traditional omnidirectional antenna is generally relatively low, and the maximum gain of the antenna is up to 5dBi, the feed of the antenna
Mode is simple, novel, and the feeding network with U-lag only has an impact the impedance operator of antenna, special to the omnidirectional of antenna
Property has little influence on.Realize good double-frequency resonance match pattern.
Description of the drawings
Fig. 1 is the stereogram after knife-edge double frequency horizontally polarized omnidirectional antenna encapsulation of the present invention；
Fig. 2 is the stereogram before knife-edge double frequency horizontally polarized omnidirectional antenna encapsulation of the present invention；
Fig. 3 is the vertical view before knife-edge double frequency horizontally polarized omnidirectional antenna encapsulation of the present invention；
Fig. 4 is the return loss plot before knife-edge double frequency horizontally polarized omnidirectional antenna encapsulation of the present invention；
Fig. 5 is the antenna pattern of XOY plane of the present invention at 2.45GHz；
Fig. 6 is the antenna pattern of XOY plane of the present invention at 5.45GHz.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
Cuboid height and the wide face constituted are front or the back side in the present embodiment, and the long face with wide composition is top surface or bottom
Face, the long face with high composition are left side or right side, and the length of wherein length is followed successively by from long to short：High, length and width.
As shown in Figure 1, a kind of knife-edge double frequency horizontally polarized omnidirectional antenna, including antenna house K, the antenna house are that one kind is adopted
The fairshaped knife-edge structure made of fiberglass reinforced plastics, can during flight using fairshaped knife-edge structure
To reduce windage, entire antenna is located inside antenna house, and the antenna includes antenna radiation unit R and feed element M, the day
Beta radiation unit is the cuboid of bore face opening, and the bore face of opening is known as opening face, the back side of knife-edge structure with
Opening face is coplanar, and the backside openings of the knife-edge structure are conducive to radiate.
The cuboid that the antenna radiation unit is open by single side is constituted, and opening face is front or the back side, the present embodiment
In the material of the cuboid use metallic copper, as shown in Fig. 2, its right side BDEG, left side ACFH, ABCD be cuboid just
Face, the also as opening face of the present embodiment, wherein AB, BG, AC is respectively that the width of knife-edge cuboid grows tall, wherein long correspondence is above-mentioned
The depth of cuboid, wide respectively 0.15 λ that grows tall of cuboidL、0.22λL、0.6λL, wherein λLIt is humorous for the antenna low-frequency range center
Vibration frequency fLCorresponding wavelength in free space.
The controllable double frequency horizontal polarization of a frequency can be realized by adjusting the radiating element and the assembled dimension of the feed element
Omnidirectional antenna.
This feed element is located inside antenna radiation unit, and this feed element inside antenna radiator all around
For relative position as shown in figure 3, feed element is located at the middle position of antenna radiation unit vertical direction, Fig. 3 is the vertical view of antenna
Figure, the faces ABGH are the top surface of cuboid, this gradual change refers to metal fed patch at a distance of cuboid is left or right side inner wall
Distance is by the inward-facing gradual change that is open, as shown in Fig. 2, feed element is elliptical gradient at a distance from the faces BDEG in the present embodiment
Form, and exactly 1/4 elliptical gradual change form metal patch, using the O points in Fig. 3 as the center of circle, long axis is in Y-axis, and short axle is in X
On axis, and one end of center of circle O and this feed metal paster structure (with one end that antenna radiation unit is left or right side is close)
Distance in the X-axis long a of elliptical semi-minor axis thus just, and center of circle O and this feed metal paster structure the other end (with
Antenna radiation unit is open the coplanar one end in face) distance in the Y-axis long b of elliptical major semiaxis, feed element M thus just
It is parallel with left and right side with one end that antenna radiator is left or right side is close and real herein with the faces inner wall BDEG of cuboid
It applies in example at a distance of d1, it is d to be open at a distance from the opposite face (faces EFGH as shown in Figure 2) in face with cuboid2, feed element with it is left
The center of the parallel one end patch edges in right side is distributing point, this distributing point is connected with 50 ohm coaxial line inner core S, and feed is single
The other end of first M is coplanar with antenna radiation unit opening face and opens a way.
This elliptical major semiaxis b is 18.3mm in the present embodiment, and the elliptical long a of semi-minor axis is 13.4mm, should be shaped like 1/4
The line width MW of elliptical form graded metal patch is 18.2mm, d1=1.2mm, d2=8.2mm, and the 1/4 elliptical form gradual change gold
The line width for belonging to patch has certain influence to the frequency of the high frequency of this dual-band antenna and low frequency ratio.
Open circuit microstrip lines feed of the gap radiation body with back of the body chamber Jing Guo the gradual change form with U-lag U can be real
The controllable double-frequency resonance pattern of existing frequency, and the half-wavelength mode of resonance for the length that low frequency resonant modes are gap, high-frequency resonant
Pattern is antenna higher order resonances mould, and U-lag U is symmetrical about the center line up and down of feed element M, and notch face distributing point, this
The groove width of U-lag U is 0.6mm in embodiment, and total length is about 25mm, and trough rim and feed element M or more above and below the U-type groove
The distance of center line is 0.9mm.And the relative distance of this U-type groove notch end and distributing point is 0.6mm.This double frequency horizontal polarization is complete
Return loss characteristic to antenna is as shown in Figure 4.Entire feed element is located at the middle position of antenna radiation unit, and adjusts feedback
The parameter of electric part influences less the omnidirectional radiation performance of antenna, and the horizontally polarized omnidirectional radiance of the antenna relies primarily on
The opening face of cuboid is formed by gap, and the antenna has good horizontal polarization complete in two frequency ranges covered
To radiation characteristic, as shown in Figure 5, Figure 6.
The present invention is formed by gap by the opening bore face of cuboid and generates horizontally polarized omnidirectional radiation, and in institute
All there is good omni-directional in two frequency ranges of covering.Inventive antenna novelty simple in structure, size is smaller and directional diagram is steady
The advantages that double-frequency resonance characteristic fixed, omni-directional is good, cross polarization is small, to realize frequency controllable, high gain, it is suitable for mobile logical
Letter field.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by the embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (6)
1. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna, including antenna house and antenna, the antenna are encapsulated in antenna house,
The antenna includes antenna radiation unit and feed element, which is characterized in that the antenna radiation unit is that a bore face is opened
The bore face of the cuboid of mouth, opening is known as opening face, and the feed element is a gradual change form metal for being provided with U-lag
Patch, and inside antenna radiation unit；
The U-lag is symmetrical about gradual change form metal patch transversal centerline, and the total length of the U-lag is 0.3 λh-0.6λh,
The width of slot is 0.5mm-1mm, wherein λhFor antenna high band center resonant frequency fhCorresponding wavelength in free space；
U-lag opening direction face distributing point in the feed element.
2. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna according to claim 1, which is characterized in that the antenna house is
Knife-edge structure, the back side of the knife-edge structure and the opening face of cuboid it is coplanar and be open.
3. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna according to claim 1, which is characterized in that the gradual change form
The gradual change form of metal patch is specially elliptical gradient, round gradual change or parabolic grades.
4. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna according to claim 1, which is characterized in that the gradual change form
Metal patch is opened a way close to cuboid opening face one end, and other end midpoint is distributing point.
5. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna according to claim 1, which is characterized in that gradual change form metal
The length of patch is 0.35 λh-0.75λh, gradual change form metal patch width is 0.2 λh-0.6λh, wherein λhFor the antenna high frequency
Section center resonant frequency fhCorresponding wavelength in free space.
6. a kind of knife-edge double frequency horizontally polarized omnidirectional antenna according to claim 1, which is characterized in that the opening of cuboid
Face length and width are respectively 0.45 λL-0.7λL、0.08λL-0.23λL, the depth of cuboid is 0.15 λL-0.35λL, wherein λLFor the day
Line low-frequency range center resonant frequency fLCorresponding wavelength in free space.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510923683.2A CN105449357B (en) | 2015-12-11 | 2015-12-11 | A kind of knife-edge double frequency horizontally polarized omnidirectional antenna |
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|---|---|---|---|
| CN201510923683.2A CN105449357B (en) | 2015-12-11 | 2015-12-11 | A kind of knife-edge double frequency horizontally polarized omnidirectional antenna |
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| CN105449357A CN105449357A (en) | 2016-03-30 |
| CN105449357B true CN105449357B (en) | 2018-11-02 |
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| CN201510923683.2A Expired - Fee Related CN105449357B (en) | 2015-12-11 | 2015-12-11 | A kind of knife-edge double frequency horizontally polarized omnidirectional antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108123226B (en) * | 2016-11-29 | 2020-07-31 | 中国工程物理研究院电子工程研究所 | Dual-frequency shared cylindrical conformal large-angle beam deflection antenna |
| CN106980097B (en) * | 2017-05-19 | 2023-10-10 | 深圳市特深电气有限公司 | Birdcage coil for magnetic resonance imaging system and tuning method thereof |
| CN107169549B (en) * | 2017-06-28 | 2023-04-28 | 嘉兴微感电子科技有限公司 | Dual-frequency dual-polarized ceramic tag |
| CN107834146A (en) * | 2017-10-25 | 2018-03-23 | 成都远东高科科技有限公司 | A kind of airborne antenna |
| CN107845859A (en) * | 2017-10-25 | 2018-03-27 | 成都远东高科科技有限公司 | The short-wave antenna propagated for long range |
| CN108448253B (en) * | 2018-04-12 | 2023-07-18 | 华南理工大学 | High-isolation dual-frequency dual-polarization omnidirectional antenna |
| CN108448242B (en) * | 2018-04-12 | 2023-08-22 | 华南理工大学 | High-isolation three-frequency dual-polarized omnidirectional antenna |
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| CN104916914A (en) * | 2015-06-11 | 2015-09-16 | 华南理工大学 | Blade wide-band horizontally-polarized omnidirectional antenna |
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| TWI619308B (en) * | 2013-06-10 | 2018-03-21 | 群邁通訊股份有限公司 | Antenna assembly |
| CN205211939U (en) * | 2015-12-11 | 2016-05-04 | 华南理工大学 | Knife -edge dual -frenquency horizontal polarisation omnidirectional antenna |
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