CN110970732B - 18-40GHz low-sidelobe dual-polarized horn antenna - Google Patents
18-40GHz low-sidelobe dual-polarized horn antenna Download PDFInfo
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- CN110970732B CN110970732B CN201911376340.3A CN201911376340A CN110970732B CN 110970732 B CN110970732 B CN 110970732B CN 201911376340 A CN201911376340 A CN 201911376340A CN 110970732 B CN110970732 B CN 110970732B
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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
- H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/12—Hollow waveguides
- H01P3/123—Hollow waveguides with a complex or stepped cross-section, e.g. ridged or grooved waveguides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention discloses an 18-40GHz low-sidelobe dual-polarized horn antenna, which is characterized in that a diagonal horn shell, four ridge waveguide sections and an end cover are sequentially connected, each four ridge waveguide section comprises a square waveguide, four ridge pieces are fastened on four corners in each square waveguide through screws, and the four ridge pieces are in a cross shape; the feed probe of the radio frequency connector is inserted into the ridge from the outside of the square waveguide. The end cover is provided with a boss, the boss is provided with a reflection cavity, and the square waveguide is sleeved on the boss. The reflection cavity is arranged in the bottom of the end cover, and the bottom of the end cover is provided with a plurality of reflection cavities. The invention has wide application prospect in the field of electronic measurement, adopts a structure of two ports, can transmit or receive two orthogonal polarized waves, has working bandwidth of more than 9:1 octaves and a side lobe level of-25 dB, and can be suitable for detection systems of high-resolution radar and the like.
Description
Technical Field
The invention relates to an 18-40GHz low-sidelobe dual-polarized horn antenna, and belongs to the technical field of horn antennas.
Background
The ultra-wideband double-ridged horn antenna is widely applied to electronic measurement, military and civil fields and the like due to the characteristics of high gain, wide frequency band and the like, but when the double-ridged horn antenna is used as a receiving antenna, the direction of the antenna needs to be rotated for receiving electromagnetic incoming waves in different polarization forms, so that orthogonal isolation is avoided, and the low working efficiency is caused.
The sidelobe level is an important factor in antenna design, and low sidelobe antennas have become an important component in high performance electronic measurement systems. In the radar detection process, clutter received by the antenna side lobe and clutter received by the main lobe are overlapped together, so that the intensity of the clutter is increased, and the radar detection and identification capability is seriously influenced. In the radar guidance system, strict requirements are placed on indexes such as the acting distance, the measuring precision and the signal-to-clutter ratio of the radar, and the antenna is required to have a proper low side lobe under the condition. In millimeter wave band, the side lobe of the conventional horn antenna is-13 dB, and the working requirement of a high resolution radar with a low side lobe above-25 is difficult to meet.
The method of four-ridge loading in the horn antenna not only can well widen the working bandwidth of the antenna, but also can realize the dual-polarization performance of the antenna. However, impedance matching in a working frequency band of the ridge-loaded ultra-wideband horn antenna is difficult, and meanwhile, the uniform aperture-plane field distribution and the large aperture-plane phase difference of the horn antenna enable the antenna to have a high secondary lobe level, and some frequency point directional diagrams can be split. Therefore, the matching design and ridge design of the antenna are important to obtain a good voltage standing wave ratio, low side lobe performance of the antenna and solve the problem of directional diagram splitting.
Disclosure of Invention
The purpose is as follows: the invention provides a low-sidelobe dual-polarized horn antenna with 18-40GHz, which aims to realize impedance matching in an antenna ultra-wideband, solve the split of a directional diagram and simultaneously obtain a low-sidelobe antenna meeting the requirement of a detection radar.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an 18-40GHz low sidelobe dual polarized horn antenna comprising: the four-ridge waveguide section comprises a square waveguide, four ridge pieces are fastened on four corners in the square waveguide through screws, and the four ridge pieces are in a cross shape; the feed probe of the radio frequency connector is inserted into the ridge from the outside of the square waveguide.
As a preferred scheme, a boss is arranged on the end cover, a reflection cavity is arranged on the boss, and the square waveguide is sleeved on the boss.
Preferably, the reflector further comprises an adjusting screw, and the adjusting screw extends into the reflecting cavity from the bottom of the end cover.
Preferably, the radio frequency connector comprises a first radio frequency connector and a second radio frequency connector, and the four ridge pieces are respectively arranged as a first ridge piece, a second ridge piece, a third ridge piece and a fourth ridge piece; the first ridge and the third ridge form a pair of ridges, the second ridge and the fourth ridge form a pair of ridges, a feed probe of the first radio-frequency connector sequentially penetrates through the square waveguide and the third ridge to extend into the first ridge, and a feed probe of the second radio-frequency connector sequentially penetrates through the square waveguide and the second ridge to extend into the fourth ridge.
Preferably, the adjusting screws comprise a first adjusting screw and a second adjusting screw which respectively extend into the reflecting cavity from the bottom of the end cover.
Preferably, the distance between the centers of the first adjusting screw and the second adjusting screw is set to be 3-4 mm.
Preferably, the ridge adopts a structure which gradually narrows from bottom to top, and the outer side surface of the ridge is a conical surface structure consisting of two cambered surfaces.
Preferably, the arc surface is connected by a first curve section surface, a second curve section surface and a straight section surface from top to bottom in sequence.
Preferably, the diagonal horn shell is relatively fixed by two trapezoidal grooves which gradually widen from bottom to top through a connecting strip on the side surface; the bottom of the trapezoidal groove is provided with a connecting part which is connected with a flange plate at the top of the square waveguide; four corners of the square waveguide are set to be vertical corners, the bottom of the outer side of the square waveguide is provided with a mounting seat, and the mounting seat is used for being connected with the radio frequency connector and the end cover.
Preferably, a distance is arranged between the centers of the feeding probes of the first radio frequency connector and the second radio frequency connector.
Preferably, the vertical distance between the centers of the feed probes of the first radio frequency connector and the second radio frequency connector is 0.5-0.8mm, and the distance between the center of the feed probe of the second radio frequency connector and the top of the boss is 0.8-1 mm.
Preferably, the length of the straight line section is 8-9mm, the length of the first curve section is 22-25mm, and the length of the second curve section is 35-37 mm.
Preferably, the distance between the straight line sections of the two opposite ridge sheets is 0.5-0.8mm, the distance between the top ends of the first curve sections is 2-2.3mm, and the distance between the top ends of the second curve sections is 16-17 mm.
Has the advantages that: according to the 18-40GHz low-sidelobe dual-polarized horn antenna, the ridge sheets are subjected to taper pin treatment, so that the coupling area between the ridge sheets is increased; the ridge pieces are designed in a segmented mode, the straight line segments ensure that the distance between the ridge pieces is fixed, and the curve segments 1 and the curvesThe gradual change of the curve segment of the line segment 2 is opened, and the matching of the antenna is improved. The unique ridge diagonal mounting structure introduces the additional die into the loudspeaker, and the additional die and the main die reach the opening surface together to change the field distribution of the opening surface, improve the directional diagram of the antenna in the working frequency band and reduce the side lobe level of the antenna. The TE can be effectively adjusted by the feed ridge waveguide, the end cover, the adjusting screw and the cylindrical reflecting cavity30And the high-order mode further improves impedance matching and expands the bandwidth of the antenna. The diagonal horn shell and the four-ridge waveguide section splicing mode greatly reduce the processing difficulty and the debugging difficulty of the ridge horn antenna. The diagonal horn shell and the ridge wave band are in an axisymmetric structure with a variable opening angle, a good primary mode-to-higher mode ratio and phase distribution are formed at the opening surface of the antenna, and the side lobe of the antenna is greatly improved.
The invention has wide application prospect in the field of electronic measurement, adopts a structure of two ports, can transmit or receive two orthogonal polarized waves, has working bandwidth of more than 9:1 octaves and a side lobe level of-25 dB, and can be suitable for detection systems of high-resolution radar and the like.
Drawings
FIG. 1 is a side view of a feedhorn according to an embodiment of the present invention;
fig. 2 is a first cross-sectional view of a feedhorn according to an embodiment of the present invention;
fig. 3 is a second cross-sectional view of a feedhorn according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an end cap provided by an embodiment of the invention;
FIG. 5 is a schematic structural diagram of two pairs of ridges provided by an embodiment of the present invention;
FIG. 6 is a schematic view of curved segments of a cambered surface provided by an embodiment of the present invention;
fig. 7 is a three-dimensional structural diagram of a horn antenna provided in an embodiment of the present invention;
fig. 8 is a structural diagram of positions of a first rf connector and a second rf connector according to an embodiment of the present invention;
fig. 9 is a structural diagram of a second rf connector and a boss according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
An 18-40GHz low sidelobe dual polarized horn antenna comprising: the device comprises a diagonal horn shell 1, four-ridge waveguide sections 2, an end cover 3 and a radio frequency connector 4; the right end of the diagonal horn shell 1 is connected with the left end of the four-ridge waveguide section 2, the right end of the four-ridge waveguide section 2 is connected with the left end of the end cover 3, and the radio frequency connector 4 extends into the four-ridge waveguide section 2.
As shown in fig. 1-3, the four-ridge waveguide segment 2 includes a square waveguide 201, a first ridge 202, a second ridge 203, a third ridge 204, and a fourth ridge 205. The first ridge sheet 202 and the third ridge sheet 204 form a pair of ridge sheets, the second ridge sheet 203 and the fourth ridge sheet 205 form a pair of ridge sheets, the two pairs of ridge sheets are crossed, and the back surfaces of the two pairs of ridge sheets are fastened at four vertical corners of the square waveguide 201 by screws respectively.
The radio frequency connector 4 comprises a first radio frequency connector 401 and a second radio frequency connector 402, a feed probe of the first radio frequency connector 401 sequentially penetrates through the square waveguide 201 and the third ridge 204 and extends into the first ridge 202, and a feed probe of the second radio frequency connector 402 sequentially penetrates through the square waveguide 201 and the second ridge 203 and extends into the fourth ridge 205.
As shown in fig. 4, a boss 301 is disposed on the end cover 3, a reflection cavity 5 is disposed on the boss 301, and the square waveguide 201 is sleeved on the boss 301.
And the adjusting screw 6 is further included, and the adjusting screw 6 extends into the reflecting cavity 5 from the bottom of the end cover 3. The adjusting screw 6 comprises a first adjusting screw 601 and a second adjusting screw 602 which respectively extend into the reflecting cavity 3 from the bottom of the end cover 3, and the center distance between the first adjusting screw 601 and the second adjusting screw 602 is 3-4 mm. The impedance is not easily matched due to the relatively large distance of the second rf connector 402 from the end cap 3 and the coupling effect between the ridges. The field distribution in the reflective cavity can be changed by changing the penetration distance and the center-to-center distance of the first adjusting screw 601 and the second adjusting screw 602, so that the impedance matching can be effectively improved and the good voltage standing wave ratio can be obtained.
As shown in fig. 5, the first ridge 202, the second ridge 203, the third ridge 204 and the fourth ridge 205 are all of a structure that gradually narrows from bottom to top, the outer side of each ridge is provided with a conical surface structure composed of two arc surfaces 206, and the back of each ridge is provided with a ridge screw hole 207 that is connected with the square waveguide 2 through a bolt; the bottom of each of the two oppositely arranged ridge sheets is provided with a probe mounting hole 208.
As shown in fig. 6, each arc surface 206 is connected from top to bottom by a first curved segment 2061, a second curved segment 2062 and a straight segment 2063.
Example (b):
as shown in fig. 7, the diagonal horn housing 1 is fixed by two trapezoidal grooves 101 gradually widening from bottom to top via lateral connecting strips 102. The bottom of the trapezoid groove 101 is provided with a connecting part 103 connected with a flange 209 at the top of the square waveguide 201. The four corners of the square waveguide 201 are set to be vertical corners 210, and bolts are inserted into the ridge bolt holes 207 on the back of each ridge from the bolt holes on the vertical corners 210 to fix the four ridges in the square waveguide 201 in a cross shape. The bottom of the square waveguide 201 is sleeved on the boss 301, the bottom of the outer side of the square waveguide 201 is provided with an installation seat 211, two adjacent side surfaces of the installation seat 211 are fixedly provided with a first radio frequency connector 401 and a second radio frequency connector 402 through bolts, and the top surface of the installation seat 211 is provided with a vertical screw hole 212 for being fixed with the end cover 3 through bolts. This structural design is easily the production and the assembly of product, also makes things convenient for the product debugging simultaneously.
The bottom of the first, second, third and fourth ridges 202, 203, 204, 205 rests on a ledge 301, wherein the reflective cavity 3 on the ledge 301 is arranged as a cylindrical structure.
The length of the straight line section is 8-9mm, the length of the first curve section is 22-25mm, and the length of the second curve section is 35-37 mm.
The distance between the straight line sections of the second ridge piece and the fourth ridge piece is 0.5-0.8mm, the distance between the top ends of the first curve sections is 2-2.3mm, and the distance between the top ends of the second curve sections is 16-17 mm; similarly, the distance between the opposite surfaces of the first ridge piece and the third ridge piece is also the same as the distance between the opposite surfaces of the second ridge piece and the fourth ridge piece. The ridge piece is gradually opened from a straight line section to a curve section, so that good transition matching of impedance is realized, and the bandwidth of the antenna is expanded.
As shown in fig. 8-9, the vertical spacing between the feed probe centers of the first and second rf connectors 401 and 402 is 0.5-0.8mm, and the spacing between the feed probe center 405 of the second rf connector and the top of the boss 301 is 0.8-1 mm.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. An 18-40GHz low sidelobe dual-polarized horn antenna, comprising: diagonal loudspeaker casing, its characterized in that: the diagonal horn shell, the four-ridge waveguide section and the end cover are sequentially connected, the four-ridge waveguide section comprises a square waveguide, four ridge pieces are fastened on four corners in the square waveguide through screws, and the four ridge pieces are in a cross shape; a feed probe of the radio frequency connector is inserted into the ridge sheet from the outer side of the square waveguide; the end cover is provided with a boss, the boss is provided with a reflection cavity, and the square waveguide is sleeved on the boss; the reflection cavity is provided with an end cover, and the bottom of the end cover is provided with a reflection cavity; the adjusting screws comprise a first adjusting screw and a second adjusting screw, and the first adjusting screw and the second adjusting screw respectively extend into the reflecting cavity from the bottom of the end cover; the ridge sheet adopts a structure which gradually narrows from bottom to top, and the outer side surface of the ridge sheet is a conical surface structure consisting of two cambered surfaces; the diagonal horn shell comprises two trapezoidal grooves which gradually widen from bottom to top, and the two trapezoidal grooves are relatively fixed through connecting strips on the side surfaces; the bottom of the trapezoidal groove is provided with a connecting part which is connected with a flange plate at the top of the square waveguide; four corners of the square waveguide are set to be vertical corners, the bottom of the outer side of the square waveguide is provided with a mounting seat, and the mounting seat is used for connecting the radio frequency connector with the end cover.
2. The 18-40GHz low sidelobe dual polarized horn antenna of claim 1 wherein: the radio frequency connector comprises a first radio frequency connector and a second radio frequency connector, and the four ridge pieces are respectively a first ridge piece, a second ridge piece, a third ridge piece and a fourth ridge piece; the first ridge and the third ridge form a pair of ridges, the second ridge and the fourth ridge form a pair of ridges, a feed probe of the first radio-frequency connector sequentially penetrates through the square waveguide and the third ridge to extend into the first ridge, and a feed probe of the second radio-frequency connector sequentially penetrates through the square waveguide and the second ridge to extend into the fourth ridge.
3. The 18-40GHz low sidelobe dual polarized horn antenna of claim 1 wherein: the center distance between the first adjusting screw and the second adjusting screw is set to be 3-4 mm.
4. The 18-40GHz low sidelobe dual polarized horn antenna of claim 1 wherein: the cambered surface is connected by a first curve section, a second curve section and a straight line section from top to bottom in sequence.
5. An 18-40GHz low sidelobe dual polarized horn antenna according to claim 2 wherein: and a distance is arranged between the center of the feed probe of the first radio frequency connector and the center of the feed probe of the second radio frequency connector.
6. An 18-40GHz low sidelobe dual polarized horn antenna according to claim 5 wherein: the vertical distance between the center of the feed probe of the first radio frequency connector and the center of the feed probe of the second radio frequency connector is 0.5-0.8mm, and the distance between the center of the feed probe of the second radio frequency connector and the top of the boss is 0.8-1 mm.
7. An 18-40GHz low sidelobe dual polarized horn antenna according to claim 4, characterized in that: the length of the straight line section is 8-9mm, the length of the first curve section is 22-25mm, and the length of the second curve section is 35-37 mm.
8. The 18-40GHz low sidelobe dual polarized horn antenna of claim 7 wherein: the distance between the straight line sections of the two opposite ridge sheets is 0.5-0.8mm, the distance between the top ends of the first curve sections is 2-2.3mm, and the distance between the top ends of the second curve sections is 16-17 mm.
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| CN201911376340.3A CN110970732B (en) | 2019-12-27 | 2019-12-27 | 18-40GHz low-sidelobe dual-polarized horn antenna |
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| CN201911376340.3A CN110970732B (en) | 2019-12-27 | 2019-12-27 | 18-40GHz low-sidelobe dual-polarized horn antenna |
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| CN110970732A CN110970732A (en) | 2020-04-07 |
| CN110970732B true CN110970732B (en) | 2022-05-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111430923B (en) * | 2020-04-16 | 2022-04-15 | 中国电子科技集团公司第二十九研究所 | Double-ridge conical horn antenna structure and method for manufacturing and installing upper ridge and lower ridge of double-ridge conical horn antenna structure |
| CN111987475B (en) * | 2020-08-04 | 2022-05-13 | 扬州船用电子仪器研究所(中国船舶重工集团公司第七二三研究所) | X/Ku frequency band polarization twistable dual-polarization corrugated horn feed source |
| CN112271458B (en) * | 2020-10-28 | 2023-04-25 | 中国电子科技集团公司第十四研究所 | High-precision machining method for waveguide horn |
| CN112436284B (en) * | 2020-11-16 | 2022-05-10 | 中国电子科技集团公司第二十九研究所 | Split double-ridge rectangular horn antenna structure and preparation method thereof |
| CN112886255B (en) * | 2021-02-07 | 2021-12-21 | 北京星英联微波科技有限责任公司 | 5G ultra-wideband small-sized dual-polarized horn antenna |
| CN113725615B (en) * | 2021-09-08 | 2022-08-12 | 南京天朗防务科技有限公司 | Broadband dual-polarized horn antenna |
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| CN202871984U (en) * | 2012-10-29 | 2013-04-10 | 南京长峰航天电子科技有限公司 | 8 mm dual-polarized conical-horn antenna |
| JP2015073248A (en) * | 2013-10-04 | 2015-04-16 | 国立大学法人 名古屋工業大学 | Quad ridge horn antenna |
| CN110034405A (en) * | 2019-04-30 | 2019-07-19 | 江苏肯立科技股份有限公司 | A kind of C-band broad beam pyramidal horn antenna |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6603438B2 (en) * | 2001-02-22 | 2003-08-05 | Ems Technologies Canada Ltd. | High power broadband feed |
| CN108987925B (en) * | 2018-07-17 | 2019-07-09 | 江苏肯立科技股份有限公司 | Double frequency circular waveguide quadruple ridged horn antenna |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202871984U (en) * | 2012-10-29 | 2013-04-10 | 南京长峰航天电子科技有限公司 | 8 mm dual-polarized conical-horn antenna |
| JP2015073248A (en) * | 2013-10-04 | 2015-04-16 | 国立大学法人 名古屋工業大学 | Quad ridge horn antenna |
| CN110034405A (en) * | 2019-04-30 | 2019-07-19 | 江苏肯立科技股份有限公司 | A kind of C-band broad beam pyramidal horn antenna |
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