CN102110889A - 8mm wave dielectric loaded moment circle transition horn antenna - Google Patents
8mm wave dielectric loaded moment circle transition horn antenna Download PDFInfo
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- CN102110889A CN102110889A CN2009102431152A CN200910243115A CN102110889A CN 102110889 A CN102110889 A CN 102110889A CN 2009102431152 A CN2009102431152 A CN 2009102431152A CN 200910243115 A CN200910243115 A CN 200910243115A CN 102110889 A CN102110889 A CN 102110889A
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Abstract
The invention relates to an 8mm wave dielectric loaded moment circle transition horn antenna. The antenna consists of a rectangular waveguide, a moment circle transition horn and a dielectric rod, wherein a moment circle transition section in the moment circle transition horn is in a smooth transition mode; the dielectric rod consists of a gradient taper section and a uniform cylindrical section, and is coaxial with the moment circle transition horn; the cylindrical section of the dielectric rod is extended into the moment circle transition horn mouth surface and is determined by a numerical analysis method; and the dielectric rod is made of polytetrafluoroethylene and a relative dielectric constant Epsilon r is 2. In the antenna, each parameter of the antenna is optimally designed by a finite element method of a high-frequency structure simulator (HFSS) for an electromagnetic field, so that the antenna can realize a narrow beam width under a smaller caliber, and the input standing wave ratio is high.
Description
Invention field
The present invention relates to a kind of horn antenna, relate in particular to eight millimeter wave dielectrics and load the moment round transition horn antenna.
Technical background
Mm-wave imaging is divided into two kinds of Active Imaging and imaging and passive imagings.Active Imaging is exactly the millimetre-wave radar imaging that we often say, and imaging and passive imaging is meant the atmospheric propagation window that relies on millimeter wave, the thermal radiation energy that receives (ground or aerial) object and background is surveyed the characteristic of object and is produced high-definition picture, this image can produce the difference that reflects the scenery each several part temperature difference and radianting capacity, to be used for observing and analyzing the characteristic of scenery.
With respect to Active Imaging, imaging and passive imaging have three aspects advantage: one, the passive type image is that the energy by the inspected object radiation obtains, principle in millimere-wave band and visible light section is the same, thereby the passive millimeter wave image is very close with visible images, help object identification, and active system such as radar, its imaging will be subjected to scintillation effect etc. to influence the natural shape that is difficult to directly manifest object; Its two, the passive type imaging is launching electromagnetic wave not, thereby does not have electromagnetic pollution, is more suitable for concealment work than active.In addition, theory analysis shows that also various coating stealth materials are good more to the stealthy performance of radar, is found by passive detection system with regard to easy more; They are three years old, with regard to surveying metal target, the emissivity of metal target is very low, it only is the radiation of reflection sky, and sky temperature is constant substantially in certain space-time unique, thereby the millimeter wave feature of metal target is very stable, and variation and vehicle whereabouts etc. are all little to the image quality influence of passive millimeter wave system round the clock.
Since the last century the eighties, along with continuing to bring out of the reaching its maturity of millimetre integrated circuit (MMIC), high speed VISI device and New Methods of Signal Processing, the passive millimeter wave imaging technique is developed towards high performance multi-beam imaging direction by the mechanical scanning imaging in past with just attracting people's attention.
Millimeter wave multi-beam imaging technique mainly contains three kinds of realization approach at present: single hole two-dimentional machinery scanning imagery, synthetic aperture imaging and focal plane array image-forming.Wherein, the focal plane imaging system has become the main system of passive millimeter wave imaging.
The 8mm focal plane imaging system is after the bore of antenna primary reflection surface is given, and the beamwidth of its antenna has also just been determined.Angle between the adjacent antenna beam center direction is the 3dB beamwidth of antenna just.For big burnt footpath ratio antenna, adjacent two array antennas are approximately equal to the 3dB beamwidth of antenna in the elementary feed for the angle at principal reflection center.
With the primary reflection surface antenna of bore 500mm, focal length 1m, the 3dB beamwidth of its antenna is approximately 1.2 °, and the spacing of adjacent two array antennas is 21mm in the corresponding elementary feed.
According to the Antenna Design principle, the 10dB beamwidth of elementary feed is answered the edge of corresponding primary reflection surface, if adopt the excessive conical-horn antenna of square circle as elementary feed for this reason, then requires elementary feed antenna bore to be not less than 25mm.
Obviously, adjacent center is apart from the 21mm being two antennas can't placing bore 25mm, so, the commonly used excessive conical-horn antenna of square circle is the designing requirement that can not satisfy the 8mm focal plane imaging system, must design a kind of antenna, this antenna can obtain high-gain (being narrow beamwidth, Low Sidelobe and low input vswr) down more small-bore.
Traditional dielectric rod loads horn antenna and adopts circular waveguide as excitation, form by conical horn and dielectric rod two parts, but when receiver be when outputing to antenna with rectangular waveguide, the excitation of antenna just need be carried out the waveform transformation of moment round transition.The research comparative maturity of the dielectric loaded horn antenna of circular waveguide excitation, medium loads the rarely seen at home report of research of moment round transition horn antenna.
The design of this antenna is not that moment round transition adds the simple cascade that medium loads conical-horn antenna, but need be optimized by the influencing factor of analysis dielectric rod parameter to standing-wave ratio and directional diagram, the present invention has provided method for designing, and verifies the correctness of optimization method by test result.
Summary of the invention
The present invention relates to a kind of eight millimeter wave dielectrics and load the moment round transition horn antenna, it is characterized in that this antenna is made up of rectangular waveguide, moment round transition loudspeaker and dielectric rod three parts, moment round transition section in the described moment round transition loudspeaker is for seamlessly transitting, described dielectric rod is made up of gradual change conical section and even cylindrical section two parts, described dielectric rod and described moment round transition loudspeaker are coaxial, and described cylindrical section stretches into the position of moment round transition loudspeaker actinal surface inside and adopts numerical analysis method to determine.
The size of rectangular waveguide is taken as 7.2 millimeters * 3.4 millimeters among the present invention.
The Finite Element of the employing electromagnetic field of high frequency HFSS of simulation software is optimized design to each parameter of described antenna among the present invention, wherein said moment round transition section height overall H is 25.2 millimeters, described gradual change conical section length L 1 is 8 millimeters, the length L 0 that described cylindrical section stretches into moment round transition horn antenna actinal surface inside is 64.9 millimeters, the end that described moment round transition loudspeaker link to each other with described rectangular waveguide is standard waveguide, the other end of rectangular waveguide transforms to circular waveguide, and described circular waveguide diameter of phi 0 is 9.5 millimeters.
Medium bar material of the present invention is a polytetrafluoroethylene, and relative dielectric constant ε r is 2, and the diameter of phi 1 of dielectric rod is 4 millimeters.
Operating frequency is 33～37GHz among the present invention, and standing-wave ratio is less than 1.25, and the main lobe width compression ratio is more than or equal to 2.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and embodiments.
Fig. 1 loads moment round transition horn antenna structural representation for medium;
Fig. 2 is an antenna input vswr curve among the embodiment;
Fig. 3 is the radiation pattern before the loaded medium not among the embodiment;
Fig. 4 loads moment round transition horn antenna antenna pattern for the embodiment medium.
Embodiment
In order to realize that the air filled section is to the impedance conversion gradually of medium filled section in the moment round transition waveguide, the part that dielectric rod stretches in the moment round transition loudspeaker adopts grading structure.Because the wave impedance of moment round transition section diverse location correspondence is all changing, the difficult analytical method solving of using, this patent adopts numerical analysis method to optimize the length L 1 that dielectric rod stretches into the position L0 and the transition of moment round transition loudspeaker.
Basic theories and aerial radiation theory according to transmission line, though each parameter all will influence aerial radiation characteristic and input vswr among Fig. 1, but parameter L 0 and L1 are the principal elements that influences the antenna input vswr, and dielectric rod diameter of phi 1 and the dielectric rod length L 2-L0 that stretches out outside the loudspeaker actinal surface are the principal elements that influences radiation pattern.
The Finite Element (FEM) of this patent employing HFSS is optimized design to each parameter of Fig. 1 antenna.The design parameter of aft antenna of being optimized is: Φ 0=9.5 millimeter, Φ 1=4 millimeter, H=25.2 millimeter, L0=64.9 millimeter, L1=millimeter.
The stationary wave characteristic measurement result of the antenna that processes by optimal design parameter has been shown among Fig. 3, and this test is carried out at Beijing Institute of Technology's anechoic chamber.Measurement result shows that in 33～37 gigahertz band, the standing-wave ratio of antenna is all less than 1.25, and this Antenna Impedance Matching characteristic of measurement result surface is good.
When test frequency being shown among Fig. 4 being 35 GHzs, not the moment round transition horn antenna E face of loaded medium rod and H face directional diagram.This test is carried out at Beijing Institute of Technology's anechoic chamber.Test result shows that antenna E face and H face 3dB beamwidth are 50.1 degree
When test frequency being shown among Fig. 5 being 35 GHzs, the moment round transition horn antenna E face of loaded medium rod and H face directional diagram.This test is carried out at Beijing Institute of Technology's anechoic chamber.Test result surface, antenna E face and H face 3dB beamwidth are 19 degree.
Behind the loaded medium rod, the beamwidth of antenna obviously narrows down in the test result comparative descriptions of Fig. 4 and Fig. 5, these moment round transition loudspeaker.
The 8mm medium loads the moment round transition horn antenna can realize narrow beam width under more small-bore: main lobe width compression ratio 〉=2, medium load the aft antenna directive gain and more do not load raising 6dB.And input vswr is good: in the standing-wave ratio of 33～37GHz broadband internal antenna less than 1.25.
Multi-beam antenna is the core component of passive millimeter wave imaging system, the application of succeeding in developing to heavy caliber primary reflection surface antenna that the 8mm medium loads the moment round transition horn antenna provides technical support, thereby has solved technical bottleneck for the exploitation of the passive millimeter wave imaging system of high spatial resolution, long-range detection.
The 8mm medium of using this patent loads the moment round transition horn antenna, can make the Aero-Space platform and scout over the ground and use the millimeter-wave radiation camera, is used for the detection and the location of earth surface remote sensing, ECOLOGICAL ENVIRONMENTAL MONITORING, weather forecast and emphasis military affairs, economic goal; Can make aircraft blind landing system, harbour monitoring system, car and boat electronic eyes system, improve the homing capability of severe weather conditions (particularly greasy weather); Can make the millimeter-wave radiation imaging system, be used for the quick nothing injury of belongings in tumour in the human body or the human body clothing is surveyed, improve the public security skill and detect ability and the clinical early diagnosis ability of medical treatment.
Claims (5)
1. a millimeter wave dielectric loads the moment round transition horn antenna, it is characterized in that this antenna is made up of rectangular waveguide, moment round transition loudspeaker and dielectric rod three parts, moment round transition section in the described moment round transition loudspeaker is for seamlessly transitting, described dielectric rod is made up of gradual change conical section and even cylindrical section two parts, described dielectric rod and described moment round transition loudspeaker are coaxial, and described cylindrical section stretches into the position of moment round transition loudspeaker actinal surface inside and adopts numerical analysis method to determine.
2. eight millimeter wave dielectrics as claimed in claim 1 load the moment round transition horn antenna, and wherein the size of rectangular waveguide is taken as 7.2 millimeters * 3.4 millimeters.
3. eight millimeter wave dielectrics as claimed in claim 2 load the moment round transition horn antenna, the Finite Element that wherein adopts the HFSS of electromagnetic field of high frequency simulation software is optimized design to each parameter of described antenna, wherein said moment round transition section height overall H is 25.2 millimeters, described gradual change conical section length L 1 is 8 millimeters, the length L 0 that described cylindrical section stretches into moment round transition horn antenna actinal surface inside is 64.9 millimeters, the end that described moment round transition loudspeaker link to each other with described rectangular waveguide is standard waveguide, the other end of rectangular waveguide transforms to circular waveguide, and described circular waveguide diameter Ф 0 is 9.5 millimeters.
4. eight millimeter wave dielectrics as claimed in claim 3 load the moment round transition horn antenna, and wherein the dielectric rod material is a polytetrafluoroethylene, and relative dielectric constant ε r is 2, and the diameter Ф 1 of dielectric rod is 4 millimeters.
5. eight millimeter wave dielectrics as claimed in claim 4 load the moment round transition horn antenna, and its operating frequency is 33～37GHz, and standing-wave ratio is less than 1.25, and the main lobe width compression ratio is more than or equal to 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102431152A CN102110889A (en) | 2009-12-25 | 2009-12-25 | 8mm wave dielectric loaded moment circle transition horn antenna |
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| CN2009102431152A CN102110889A (en) | 2009-12-25 | 2009-12-25 | 8mm wave dielectric loaded moment circle transition horn antenna |
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| CN102110889A true CN102110889A (en) | 2011-06-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155778A (en) * | 2014-08-29 | 2014-11-19 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
| CN105591180A (en) * | 2016-01-29 | 2016-05-18 | 北京理工大学 | Millimeter-wave terahertz-wave waveguide diplexer |
| CN107546475A (en) * | 2017-09-06 | 2018-01-05 | 哈尔滨工业大学 | A kind of dual-band antenna feed applied to 5G communications |
| CN110518365A (en) * | 2019-08-19 | 2019-11-29 | 四川大学 | A kind of coated by dielectric antenna and parabola antenna based on 3D printing technique |
| CN114050392A (en) * | 2021-08-19 | 2022-02-15 | 北京古大仪表有限公司 | Power combiner, high-frequency module and radar level meter |
| CN114887227A (en) * | 2022-07-08 | 2022-08-12 | 北京中成康富科技股份有限公司 | Protection device and protection method of millimeter wave antenna and millimeter wave therapeutic apparatus |
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| US4090203A (en) * | 1975-09-29 | 1978-05-16 | Trw Inc. | Low sidelobe antenna system employing plural spaced feeds with amplitude control |
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| US4090203A (en) * | 1975-09-29 | 1978-05-16 | Trw Inc. | Low sidelobe antenna system employing plural spaced feeds with amplitude control |
Non-Patent Citations (2)
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| 李明: "一种混合模喇叭天线——介质棒聚束喇叭", 《航天电子对抗》 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155778A (en) * | 2014-08-29 | 2014-11-19 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
| CN104155778B (en) * | 2014-08-29 | 2017-02-01 | 厦门大学 | Terahertz electric field intensifier with air gap conical gradually-changing guided wave structure |
| CN105591180A (en) * | 2016-01-29 | 2016-05-18 | 北京理工大学 | Millimeter-wave terahertz-wave waveguide diplexer |
| CN105591180B (en) * | 2016-01-29 | 2018-09-14 | 北京理工大学 | A kind of millimeter wave THz wave waveguide duplexer |
| CN107546475A (en) * | 2017-09-06 | 2018-01-05 | 哈尔滨工业大学 | A kind of dual-band antenna feed applied to 5G communications |
| CN110518365A (en) * | 2019-08-19 | 2019-11-29 | 四川大学 | A kind of coated by dielectric antenna and parabola antenna based on 3D printing technique |
| CN114050392A (en) * | 2021-08-19 | 2022-02-15 | 北京古大仪表有限公司 | Power combiner, high-frequency module and radar level meter |
| CN114050392B (en) * | 2021-08-19 | 2023-11-24 | 北京古大仪表有限公司 | Power combiner, high-frequency module and radar level gauge |
| CN114887227A (en) * | 2022-07-08 | 2022-08-12 | 北京中成康富科技股份有限公司 | Protection device and protection method of millimeter wave antenna and millimeter wave therapeutic apparatus |
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Application publication date: 20110629 |