CN105470651A - Dielectric-loaded based ultra wide band compact field feed source - Google Patents
Dielectric-loaded based ultra wide band compact field feed source Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
- H01Q13/0275—Ridged horns
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to a dielectric-loaded based ultra wide band compact field feed source. The ultra wide band compact field feed source comprises an improved dielectric-loaded horn antenna (1), a supporting column (2), a flange plate (3) and a wave-absorbing material (4), wherein a ridge waveguide part is matched with a ridge curve of a horn for increasing the thickness of a ridge (5) to the maximum; two semi rigid coaxial cable electric connectors connected by an SMA connector are adopted as feed probes, and the diameter of the cable is less than 2 mm; the two feed probes are perpendicularly mounted, and are corresponding to two polarities of the feed source respectively; the radiation electric field of the feed source antenna can be concentrated to a dielectric region as far as possible by optimizing the shape of the dielectric-loaded material and the relative position of a four-ridge horn antenna for stabilizing the phase center; the supporting column of a certain length is arranged behind the dielectric-loaded horn antenna to enable the dielectric-loaded horn antenna aperture to be far from a feed source bracket; the wave-absorbing material of a specific size is added at the bottom of the supporting column for restraining multiple times of radiation caused by a complex metal structure of the feed source bracket; and the dielectric-loaded based ultra wide band compact field feed source has the outstanding advantages of small size, light quality and low cost.
Description
Technical field
The present invention relates to the technical field of compact feed, be specifically related to a kind of ultra-wideband compact feed based on coated by dielectric.
Background technology
Along with the development of Compact Range technology, Compact Range system testing efficiency is improved constantly, no matter be that sweep measurement or the speed of point-frequency measurement are obtained for significant increase, therefore, original standard wave band feed source can not meet the requirement that Compact Range is measured.Broadband compact feed becomes the survey tool of following Compact Range VS .NET Prerequisites.Can have a lot as the alternative antenna of ultra-wideband compact, wherein ridge waveguide loudspeaker have wider impedance bandwidth, objectively there are the potentiality as compact feed, but due to ridge waveguide loudspeaker directional diagram along with the change of frequency changes greatly, and Compact Range is very high to the pattern requirements of feed, therefore directly cannot apply, Fine design must be done for the requirement of Compact Range to feed.The major requirement of Compact Range to feed is that directional diagram is symmetrical in H face, E face; In the illumination angle in corresponding dead zone, amplitude pattern and phase pattern all need very level and smooth, in general the bandwidth covered about 3 octaves relatively easily realizes, but when frequency raises further, only adopting the ridge waveguide loudspeaker of traditional optimal design to be competent at, inevitably will there is certain major lobe of directional diagram division in ridge waveguide loudspeaker.
1973, JohnL.Kerr have developed the long ultra broadband ridged horn of minor axis, as the feed that electromagnetic compatibility is measured.The ridged horn that have employed two different sizes covers 0.2-2GHz and 1-12GHz two frequency ranges, and all achieves highly desirable performance in these two frequency ranges.Wherein the loudspeaker axial dimension of 1-12GHz is 6inch, and actinal surface is of a size of 9.5*5.44inch; Gain in whole frequency band is all within the scope of 5dB-13dB, and wherein low-frequency range is slightly low; Cross polarization is than below-40dB; Standing-wave ratio is less than 2:1 in most of frequency band; E face directional diagram remains on about 40 °, and H face directional diagram remains on about 40 °.The key dimension of 0.2-2GHz loudspeaker is that 1-12GHz antenna size obtains with the scale amplifying of 5:1, but both are distinct on activation fragment ridge waveguide, the axial dimension of 0.2GHz-2GHz loudspeaker is 37inch, and actinal surface is of a size of 37.5*27.2inch, and weight is about 10kg.Such antenna is that single-polarized antenna cannot realize dual polarization, realizes dual polarization and must adopt four ridge waveguide loudspeaker.In addition the directional diagram of such antenna and phase center excessive with frequency change, can not as compact feed.
2005, the people such as M.Botello-Perez carried out introduction specifically to the model of Kerr in the literature, and had carried out comparatively accurate simulation analysis of computer.Propose the size design formula of some activation fragment ridge waveguides in document, useful amendment has been carried out to ridge curve, and has given simulation result.Meanwhile, detailed analyzes the position of excitation probe, the size of probe and its insertion depth to the impact of standing wave performance, and gives corresponding curve.But amplitude pattern taper to ridge waveguide loudspeaker identical with the document of ridged horn of speaking more greatly and phase pattern taper do not do strict control, can not be used as compact feed.
Therefore, design a kind of novel ultra-wideband antenna, meet the requirement of Compact Range to feed and be of practical significance.
Summary of the invention
The present invention proposes a kind of novel ultra-wideband compact feed based on coated by dielectric, it is little that this feed has volume, and quality is light, low cost, high performance outstanding advantages.
The technical solution used in the present invention is: a kind of ultra-wideband compact feed based on coated by dielectric, comprises a coated by dielectric quadruple ridged horn antenna, support column, ring flange and the absorbing material covered on ring flange, coated by dielectric quadruple ridged horn antenna comprises the ridge that four adopt particular ridge curve, a back cavity, the loudspeaker wall of a specific dimensions, a short board, two half firm coaxial cable feed joints adopting sub-miniature A connector to connect, four back cavities regulate the coated by dielectric device of probe and an employing three sections of compounds, coated by dielectric quadruple ridged horn antenna is side on the support columns, coated by dielectric quadruple ridged horn antenna is connected with support column by screw, support column is above ring flange, support column is also connected with ring flange by screw, the absorbing material covered on ring flange is bonded on ring flange, the loudspeaker wall of the specific dimensions of coated by dielectric quadruple ridged horn antenna, back cavity and short board connect and compose the main body of horn antenna successively, four adopt the ridge of particular ridge curve to be arranged on four walls of loudspeaker wall respectively, half firm coaxial cable feed joint of two employing sub-miniature A connectors connection passes one of the chi chung of back cavity and four employing particular ridge curves successively, the outer conductor of cable-fed joint and back cavity and the ridge passed are electrically connected, the inner wire of cable-fed joint and the ridge on opposite are electrically connected, four back cavities regulate probe from the rear of short board through short board, the degree of depth regulating probe to insert back cavity can adjust, the ridge of particular ridge curve is adopted to be plugged in together with four near the actinal surface that coated by dielectric device is positioned at whole loudspeaker.
Wherein, in described coated by dielectric quadruple ridged horn antenna, the side's of the being taper of loudspeaker wall, length is between 95 ~ 105mm, and actinal surface width is between 77 ~ 85mm.
Wherein, in described coated by dielectric quadruple ridged horn antenna, the thickness of ridge waveguide ridge is between 3.3 ~ 4mm, and the spacing of loudspeaker ridge waveguide part two ridge is between 1.05 ~ 1.2mm; Four ridges of four ridge waveguides adopt 50 ° of corner cuts in position close to each other, and the main module feature impedance of four ridge waveguides is mated with coaxial line; The distance of half firm coaxial cable feed joint distance short board of two sub-miniature A connector connections is respectively 9.6mm and 10.1mm.
Wherein, in described coated by dielectric quadruple ridged horn antenna, coated by dielectric device adopts circular cone, round platform and hemisphere three stage structure; Cone tip distance bell mouth surface distance is 72mm, and circular cone bottom surface is identical with the diameter of round platform bottom surface, all gets between 58 ~ 62mm, and hemispherical diameter is identical with round platform upper surface diameter, is 19.2mm; Coated by dielectric device adopts polytetrafluoroethylmaterial material, and dielectric constant is 2.2; Coated by dielectric device inserts ridge sheet, interference portion cutting medium loader.
Wherein, in described coated by dielectric quadruple ridged horn antenna, the ridge curve of ridged horn is according to fixing exponential curve gradual change, and exponential curve equation is y=0.55*e
0.043*x-0.001*x.
Wherein, in described coated by dielectric quadruple ridged horn antenna, the distance in the ridge distance short board short circuit face of ridged horn is 8.8mm; Adopt conducting resinl to connect ridged horn antenna back cavity after the ridge of ridged horn, realize the excellent electric contact of ridge and back cavity.
Wherein, described antenna body is made up of metal, and metal is selected from: aluminium, iron, tin, copper, silver, gold, platinum, and the alloy of above-mentioned metal.
Wherein, between described support column coated by dielectric quadruple ridged horn antenna and ring flange, length is between 255 ~ 355mm, and structure can be four cylinders, the support column of the composition such as cuboid; By adjusting the height of support column, feed phase center is overlapped in reflecting surface focus.
Wherein, cover absorbing material height on ring flange between 45mm ~ 60mm, length and width are 400 ~ 500mm.
Principle of the present invention is:
The present invention is a kind of ultra-wideband compact feed based on coated by dielectric, and frequency coverage reaches 9 octaves (as: 2 ~ 18GHz).It comprises modified model dielectric loaded horn antenna 1, support column 2, ring flange 3 and an absorbing material 4.Modified model dielectric loaded horn antenna adopts the square loudspeaker of length-specific and actinal surface size to make whole antenna E face and H face directional diagram grade substantially in working band.Ridge waveguide part coordinates the ridge curve of loudspeaker, realizes the thickness of widened spine 5 to greatest extent, strengthens ridge spacing, ensures the single mode transport of four ridge waveguides on the one hand, facilitates processing and manufacturing to greatest extent on the one hand.The half firm coaxial cable point joint 8 that feed probes adopts two sub-miniature A connectors to connect, cable size is less than 2mm, two feed probes at right angle settings, respectively two polarization of corresponding feed.Introduce complex coated by dielectric device 10 in bamboo product, reduce the actinal surface size of feed antenna, be conducive to the antenna pattern of broadening high frequency feed antenna.By the shape of optimized medium loader 10 and the relative position of quadruple ridged horn antenna, the radiated electric field of feed antenna can be made to concentrate on areas of dielectric as far as possible, serve the effect at stable phase angle center.The support column 2 of configuration certain length after coated by dielectric quadruple ridged horn antenna 1, make coated by dielectric quadruple ridged horn antenna 1 actinal surface away from feed source bracket, the two ends up and down of support column configure certain coupling connecting media and load quadruple ridged horn antenna 1 and ring flange 3, and bottom support column 2, increase the absorbing material of specific dimensions, suppress the repeatedly radiation that the complicated metal structure due to feed source bracket causes.
The present invention's advantage is compared with prior art:
(1), the present invention introduces for the requirement of feed antenna the actinal surface size that complex coated by dielectric device (10) reduces feed antenna in conjunction with Compact Range, the broadening working band of quadruple ridged horn antenna, high frequency radiation electric field is concentrated on areas of dielectric, avoid the main lobe division that high frequency direction figure occurs, the problems such as Phase center variation is large.
(2), the present invention by feed antenna design in introduce quadruple ridged horn scheme, achieve the low standing wave work of dual polarization in 2 ~ 18GHz frequency range, substantially increase testing efficiency.
(3), the present invention's actual demand of applying in conjunction with Compact Range to the support column 2 of feed antenna, absorbing material 4 etc. is optimized design, makes feed antenna meet the measurement demand of Compact Range completely.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of ultra-wideband compact feed based on coated by dielectric of the present invention;
Fig. 2 is coated by dielectric quadruple ridged horn antenna structure view;
Fig. 3 is support column and flange arrangement and connected mode schematic diagram;
Fig. 4 is the coated by dielectric device structural representation of three sections of compounds;
Reference numeral implication wherein in figure is: 1 is coated by dielectric quadruple ridged horn antenna, and 2 is support column, and 3 is ring flange, 4 is absorbing material, and 5 is ridge, and 6 is back cavity, 7 is loudspeaker wall, 8 half just coaxial cable feed joints for adopting sub-miniature A connector to connect, 9 is back cavity adjustment probe, and 10 is the coated by dielectric device of employing three sections of compounds, 10a is coated by dielectric device conical section, 10b is coated by dielectric device round platform section, and 10c is coated by dielectric device hemisphere section, and 11 is short board.
Embodiment
Design of the present invention is as follows: the present invention has good impedance bandwidth according to quadruple ridged horn antenna, good directional diagram, by the actinal surface size to ridge waveguide loudspeaker, axial length, ridge waveguide thickness, ridge spacing, ridge curve, ridge waveguide size, the ridge waveguide loudspeaker after the design of the critical sizes such as ridge and back cavity distance makes design can obtain impedance bandwidth wide as far as possible under two perpendicular polarizations, then introduce polytetrafluoroethylene and load.After adding polytetrafluoroethylene, the low-frequency cut-off frequency of ridge waveguide loudspeaker reduces further, can worsen on the impedance operator basis of quadruple ridged horn not too much by the insertion position of appropriate design polytetrafluoroethylene, high frequency radiation electric field is concentrated in dielectric structure, thus avoid the common high frequency direction figure division of four ridge waveguide loudspeaker, at the matching structure that the design of coated by dielectric device is suitable, avoid the strong reflection may introduced to air section transition by coated by dielectric device, reduce the conversion of phase center simultaneously as much as possible.
According to the design of foregoing invention, the present invention adopts following technical scheme:
First actinal surface size and the length of quadruple ridged horn antenna is substantially determined, actinal surface size determines primarily of low-limit frequency, traditional quadruple ridged horn actinal surface need be greater than the half of lowest operating frequency, corresponding 2GHz, actinal surface is selected to be greater than 75mm, the length of respective antenna according to the principle of optimum horn designs, should take into account actinal surface phase difference little as far as possible simultaneously, and horn length is chosen as 1.3 ~ 1.5 times of actinal surface size.
According to the magnetic field integral equation method that BALANIS proposes, the selected main mould TE of ridge waveguide
10single mode operation frequency band range is 2GHz ~ 12GHz, determines that the thickness of four ridge waveguides and ridge waveguide spacing are respectively 3.3 ~ 4mm and 1.05 ~ 1.2mm.After considering coated by dielectric herein in advance, the medium frequency of horn antenna can reduce further.Four ridges 5 of four ridge waveguides adopt 50 ° of corner cuts in position close to each other, and the main module feature impedance of four ridge waveguides is mated with coaxial line.Also be the needs of structural design to the corner cut of ridge 5, four ridges 5 can not be interfered mutually, have employed to be greater than 45 ° of corner cuts and to be conducive to ensureing between slightly away from ridge 5 near You compare great gap, position.Do optimal design to the half firm coaxial cable feed joint 8 that two sub-miniature A connectors connect apart from the distance of short board 11, farthest to reduce standing-wave ratio, the size after optimization is respectively 96mm and 101mm.
Ridge waveguide loudspeaker ridge curved portion generally adopts:
y＝a*e
R*x-b*x
As fundamental curve, what wherein R mainly determined ridge curve opens speed, and R is larger, and speed of opening is faster, and respective antenna axial length is shorter, and R is less, and speed of opening is slower, and antenna axial length is longer.In general R is larger, faster to free space wave impedance transformation by transmission line, reflect larger, but consider and need stable phase center as feed antenna, excessive antenna axial length can not be selected with this, therefore R needs under the condition that reflection is not too large large as far as possible, and a preferred embodiment of the present invention selectes R 0.043.A, b can finally be determined by bell mouth surface size and ridge waveguide size.
There is certain error in antenna processing in Practical Project, need in the design to provide to process tolerance accordingly, because mismachining tolerance exists, ridged horn ridge 5 is difficult to ensure good electrical contact with back cavity 6, emulation and experiment all prove, if ridged horn ridge 5 and back cavity 6 do not have good electrical contact to produce a very large impact to the standing wave of ridged horn.Therefore add ridge 5 and ridged horn antenna back cavity 6 that conducting resinl connects ridged horn in the design, realize the excellent electric contact of ridge 5 and back cavity 6.In addition, the electrical connection between ridged horn ridge 5 and loudspeaker wall 7 is ensured by metallic screw.
Back cavity 6 size design is mainly based on the standing wave optimization of four ridge waveguide loudspeaker, in a preferred embodiment of the present invention, oral cavity width is 28.8mm, be highly 8.2mm, back cavity 6 is 8.8mm apart from the distance of ridge waveguide ridge 5 rear end, and have employed back cavity adjustment probe 9 to ensure that back cavity does not produce higher mode in 2 ~ 18GHz frequency range.The half firm coaxial cable electric connection 8 that feed probes adopts two sub-miniature A connectors to connect, cable size is less than 2mm, two feed probes at right angle settings, respectively two polarization of corresponding feed.
The processing of modified model quadruple ridged horn antenna can adopt aluminium, the metal that the conduction such as copper is good, as a preferred embodiment, adopts duralumin as rapidoprint.
In order to overcome the main lobe pattern division that four ridge waveguide loudspeaker there will be after more than 3 octaves, the problems such as Phase center variation is large, introduce polytetrafluoroethylene and load.Coated by dielectric device adopts circular cone 10a, round platform 10b and hemisphere 10c three stage structure.Cone tip distance bell mouth surface distance is 72mm, and circular cone 10a bottom surface is identical with the diameter of round platform 10b bottom surface, all gets between 58 ~ 62mm, and hemisphere 10c diameter is identical with round platform 10b upper surface diameter, is 19.2mm.Coated by dielectric device 10 adopts polytetrafluoroethylmaterial material, and dielectric constant is 2.2.Coated by dielectric device inserts ridge 5, interference portion cutting medium loader 10.As shown in Figure 4, coated by dielectric quadruple ridged horn antenna structure as shown in Figure 1 for coated by dielectric device structure.
Adopt the ultra broadband horn antenna of coated by dielectric little in order to ensure high band directional diagram amplitude taper, in whole frequency range, Phase center variation is little, farthest reduces Antenna aperture, shortens axial length.The ultra broadband horn antenna of the coated by dielectric therefore designed has higher back lobe, in the compact feed system of reality, complicated supporting structure is often had after feed, this supporting structure is generally metal material, this metal material easily produces secondary radiation, therefore must reduce the secondary radiation because support causes.Invention introduces the support column 2 of lengthening, Feed Horn aerial radiation actinal surface is pushed away supporting structure, support column 2 is between coated by dielectric quadruple ridged horn antenna 1 and ring flange 3, and length is between 255 ~ 355mm, as shown in Figure 3.By adjusting the height of support column 2, feed phase center is overlapped in reflecting surface focus.Adopt taper absorbing material 4 to block the major part of feed source bracket system simultaneously.Absorbing material 4 vertex of a cone can not exceed feed aperture, and absorbing material 4 reflectivity emulates by the present invention, adopts binary arrays model, calculates the absorbing material minimal reflection filtering met corresponding to feed pattern requirements.The different absorptivities corresponding to differing heights absorbing material, set up simple binary battle array simulation model, contrast binary arrays directional diagram, determines that inhaling ripple material 4 material height lower than 45mm, can not consider whole feed structure and select absorbing material 4 height the most desirable between 45 ~ 60mm.Absorbing material 4 area is more conducive to more greatly the secondary radiation suppressing back lobe to motivate, but consider that the excessive use of the structural wave-absorbing material of feed source bracket is inconvenient, the absorbing material that should choose is the smaller the better, by simulation calculation, selects length and width the most reasonable at 400 ~ 500mm.Ring flange 3 is for connecting feed and feed source bracket.The structural representation of the ultra-wideband compact feed of whole coated by dielectric as shown in Figure 1.
A kind of ultra-wideband compact feed based on coated by dielectric that the present invention relates to, this feed both can also can as the reception feed of Compact Range as the transmitting feed of Compact Range.Be mainly used in the conventionally test of Compact Range, can be used as antenna and the rcs measurement system feed of Compact Range, also as Compact Range dead zone detection probe, thus the detection of efficient dead zone can be realized.In addition, the ultra-wideband antenna of the coated by dielectric of this feed also can be used as conventional reflector surface antenna feed, the terminal antenna of ultra-broadband radio equipment and the antenna for base station of ultra-wideband communications such as electronic reconnaissance, electronic jamming and ground penetrating radar.
Claims (9)
1. the ultra-wideband compact feed based on coated by dielectric, it is characterized in that: comprise a coated by dielectric quadruple ridged horn antenna (1), support column (2), ring flange (3) and the absorbing material (4) covered on ring flange, coated by dielectric quadruple ridged horn antenna (1) comprises the ridge (5) that four adopt particular ridge curve, a back cavity (6), the loudspeaker wall (7) of a specific dimensions, a short board (11), two half firm coaxial cable feed joints (8) adopting sub-miniature A connector to connect, four back cavities regulate the coated by dielectric device (10) of probe (9) and an employing three sections of compounds, coated by dielectric quadruple ridged horn antenna (1) is in support column (2) top, coated by dielectric quadruple ridged horn antenna (1) is connected with support column (2) by screw, support column (2) is in ring flange (3) top, support column (2) is also connected with ring flange (3) by screw, the absorbing material (4) covered on ring flange is bonded on ring flange (3), the loudspeaker wall (7) of the specific dimensions of coated by dielectric quadruple ridged horn antenna (1), back cavity (6) and short board (11) connect and compose the main body of horn antenna successively, four adopt the ridge (5) of particular ridge curve to be arranged on four walls of loudspeaker wall (7) respectively, half firm coaxial cable feed joint (8) of two employing sub-miniature A connectors connection passes one in the ridge (5) of back cavity (6) and four employing particular ridge curves successively, the outer conductor of cable-fed joint and back cavity (6) and the ridge passed are electrically connected, the inner wire of cable-fed joint and the ridge on opposite are electrically connected, four back cavities regulate probe (9) from the rear of short board (11) through short board (11), the degree of depth regulating probe to insert back cavity (6) can adjust, the ridge of particular ridge curve (5) is adopted to be plugged in together with four near the actinal surface that coated by dielectric device (10) is positioned at whole loudspeaker.
2. the ultra-wideband compact feed based on coated by dielectric according to claim 1, it is characterized in that: in described coated by dielectric quadruple ridged horn antenna, loudspeaker wall (7) is square taper, and length is between 95 ~ 105mm, and actinal surface width is between 77 ~ 85mm.
3. the ultra-wideband compact feed based on coated by dielectric according to claim 1, it is characterized in that: in described coated by dielectric quadruple ridged horn antenna, the thickness of ridge waveguide ridge (5) is between 3.3 ~ 4mm, and the spacing of loudspeaker ridge waveguide part two ridge is between 1.05 ~ 1.2mm; Four ridges (5) of four ridge waveguides adopt 50 ° of corner cuts in position close to each other, and the main module feature impedance of four ridge waveguides is mated with coaxial line; The distance of half firm coaxial cable feed joint (8) distance short board (11) of two sub-miniature A connector connections is respectively 9.6mm and 10.1mm.
4. the ultra-wideband compact feed based on coated by dielectric according to claim 1, is characterized in that: in described coated by dielectric quadruple ridged horn antenna (1), and coated by dielectric section adopts circular cone, round platform and hemisphere three stage structure; Cone tip distance bell mouth surface distance is 72mm, and circular cone bottom surface is identical with the diameter of round platform bottom surface, all gets between 58 ~ 62mm, and hemispherical diameter is identical with round platform upper surface diameter, is 19.2mm; Coated by dielectric device adopts polytetrafluoroethylmaterial material, and dielectric constant is 2.2; Coated by dielectric device inserts ridge sheet, interference portion cutting medium loader.
5. the ultra-wideband compact feed based on coated by dielectric according to claim 1, is characterized in that: in described coated by dielectric quadruple ridged horn antenna, and the ridge curve of ridged horn is according to fixing exponential curve gradual change, and exponential curve equation is y=0.55*e
0.043*x-0.001*x.
6. the ultra-wideband compact feed based on coated by dielectric according to claim 2, it is characterized in that: in described coated by dielectric quadruple ridged horn antenna, the ridge (5) distance short board (11) of ridged horn is 8.8mm near the distance of the plane of ridge (5) side; The ridge (5) of ridged horn adopts conducting resinl to connect ridged horn antenna back cavity (6) afterwards, realizes the excellent electric contact of ridge (5) and back cavity (6).
7. the ultra-wideband compact feed based on coated by dielectric according to claim 1, is characterized in that: described antenna body is made up of metal, and metal is selected from: aluminium, iron, tin, copper, silver, gold, platinum, and the alloy of above-mentioned metal.
8. the ultra-wideband compact feed based on coated by dielectric according to claim 1, it is characterized in that: described support column (2) length between coated by dielectric quadruple ridged horn antenna (1) and ring flange (3) is between 255 ~ 355mm, structure can be four cylinders, the support column (2) of the composition such as cuboid; By the height of adjustment support column (2), feed phase center is overlapped in reflecting surface focus.
9. the ultra-wideband compact feed based on coated by dielectric according to claim 1, is characterized in that: cover on ring flange absorbing material (4) height between 45mm ~ 60mm, length and width are 400 ~ 500mm.
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| CN107732435B (en) * | 2017-08-02 | 2020-06-16 | 北京航空航天大学 | Low-frequency octave wide-beam compact field feed source based on medium loading |
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| CN114759354B (en) * | 2022-04-02 | 2023-06-16 | 华南理工大学 | Miniaturized broadband stable beam horn feed source antenna |
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