CN112615161A - 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source - Google Patents
7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source Download PDFInfo
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- CN112615161A CN112615161A CN202011444224.3A CN202011444224A CN112615161A CN 112615161 A CN112615161 A CN 112615161A CN 202011444224 A CN202011444224 A CN 202011444224A CN 112615161 A CN112615161 A CN 112615161A
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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
- H01Q13/0208—Corrugated horns
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Abstract
The invention relates to a 7mm waveband broadband small-opening-angle shaped corrugated horn feed source which is a Gaussian shaped curve combined with a gradual change groove depth mode conversion structure, has the working frequency of 30-50GHz and the relative bandwidth of 50 percent and is applied to a 7mm waveband receiver system in the field of radio astronomy. The feed source consists of a Gaussian beam-forming section, a mode conversion section, a diameter-changing section, a circular waveguide, a Gaussian beam-forming section corrugated groove and a mode conversion section corrugated groove; the Gaussian shaping section adopts a Gaussian shaping curve structure impedance transformation mode to ensure the transmission of a main mold of the Gaussian shaping section; the mode conversion section realizes the conversion of the circular waveguide main mode into a corrugated structure mixed mode by changing the groove depth of a corrugated groove of the mode conversion section. The feed source physical field angle is 23.688 degrees, the return loss in the whole bandwidth range is below-12 dB, the main beam radiation directional diagram gain reaches above 19.9dB, the requirement of building a 7-millimeter wave band receiver system is met, and the feed source can be used as an independent antenna to carry out corresponding wave band atmosphere opacity measurement.
Description
Technical Field
The invention relates to a 7-millimeter waveband ultra-wide band small-opening-angle shaped corrugated horn feed source which is specially used for a broadband microwave receiver system in the field of radio astronomy.
Background
In the field of radio astronomy, there are various horn feeds applied to antennas and receiver systems. The method can be divided into a main die, a dual die, a multi-die, a mixed die, a combined die and the like according to working modes; the cross section can be divided into rectangle, square, round, ellipse and coaxial according to the shape of the cross section; the structure of the inner wall can be divided into a light wall and a corrugated shape; the shape can be divided into a column shape, a cone shape and a variable flare shape; the antenna can be used as a separate antenna and used as a combined reflecting surface according to the application.
In the microwave frequency band, it is important to select the feed sources according to the requirements for the types of the horn feeds. If a standard gain horn is designed, a corrugated conical horn or a main-mode pyramid horn can be selected; when the feed-forward parabolic antenna is used, a flange plate slotted horn, a main mode horn or a dual-mode horn are preferably selected; when the aperture/wavelength of the paraboloid is larger, the large-opening-angle corrugated conical horn can be selected; if a horn feed source is designed for the double-reflector antenna and the performance requirement is general, a main mode horn or a dual-mode horn can be selected; if a horn feed source is designed for the high-performance double-reflector antenna, a multimode horn or a corrugated horn must be preferred; if wide band, dual band or multi band, low side lobe is required, corrugated conical horn or some combined horn is preferable; if the dual polarization is required to be designed, the design of a square section or a circular section can be adopted; if the required frequency band is very wide and the power capacity is very small, for example, as a scout receiving antenna, an exponential dual-ridged horn or the like is selected.
The performance of the horn feed is related to the overall performance of the radio telescope antenna. Therefore, the research and development of the horn feed source with excellent performance on the dual-band, multi-band and extremely wide band is always the core power for promoting the development of radio astronomy in the microwave receiving field. Because radio signals are all very weak, and the observation requirements in the aspects of polarization and the like exist, the design of the horn feed source applied to the field has some basic requirements: such as suitable amplitude and phase patterns and phase centers, low cross-polarization, wider frequency band range and antenna performance in this range, e.g. lobe width, gain, side lobe level, maximum cross-polarization level, standing wave ratio, etc. Generally, the wider the band, the lower the demand. The frequency band characteristics of different types of horn feeds are very different, and the frequency band characteristics of the same antenna for different parameters may also be very different. At present, the horn with good directional diagram axis rotation performance and the widest frequency band is a corrugated conical horn, and the frequency band ratio can be made to be 2.7: 1.
The corrugated cone horn is formed by embedding corrugated grooves in a smooth-wall cone horn. The embedded corrugation groove forms are mainly 5 types: a common through groove, a single-side T-shaped loading groove, a double-side T-shaped loading groove, a V-shaped loading groove and a double groove. Although the form of the corrugation grooves varies, the characteristic equations are the same, and the difference is only reflected in the equivalent wall admittance Y in the characteristic equations. Although the corrugated cone horn is difficult to process and has higher cost, the lobe equalization is good, the cross polarization level and the side lobe level are both very low, the frequency band is wide, and the corrugated cone horn is particularly suitable for various high-performance radio telescope antenna feed systems at present.
Corrugated cone horn designs are generally classified by the size of the horn half opening angle. When the angle is less than 20 degrees, the horn is a small opening angle corrugated conical horn; when the opening angle is between 20 and 30 degrees, the angle belongs to the medium opening angle; and when the opening angle is larger than 30-70 degrees, the opening angle is large. The corrugated cone horn is generally composed of a reducer section, a variable-mode section, a transition section (including a variable-frequency section and a variable-angle section) and a radiation section, wherein the reducer section is generally a smooth-wall waveguide section. The basic principle of the corrugated conical horn engineering design is that firstly, the corrugated groove form (straight groove, loading groove or the mixed form thereof) is selected according to the bandwidth ratio of the working frequency band, and secondly, the radiation section form is selected according to the caliber size, the total length and the phase center position of the horn feed source.
Disclosure of Invention
The invention aims to provide a 7-millimeter waveband broadband small-opening-angle shaped corrugated horn feed source which is a Gaussian shaped curve combined with a gradual groove depth mode conversion structure, has the working frequency of 30-50GHz and the relative bandwidth of 50% and is applied to a 7-millimeter waveband receiver system in the field of radio astronomy. The feed source consists of a Gaussian beam-forming section, a mode conversion section, a diameter-changing section, a circular waveguide, a Gaussian beam-forming section corrugated groove and a mode conversion section corrugated groove; the Gaussian shaping section adopts a Gaussian shaping curve structure impedance transformation mode to ensure the transmission of a main mold of the Gaussian shaping section; the mode conversion section realizes the conversion of the circular waveguide main mode into a corrugated structure mixed mode by changing the groove depth of a corrugated groove of the mode conversion section. The feed source physical field angle is 23.688 degrees, the return loss in the whole bandwidth range is below-12 dB, the main beam radiation directional diagram gain reaches above 19.9dB, the requirement of building a 7-millimeter wave band receiver system is met, and the feed source can be used as an independent antenna to carry out corresponding wave band atmosphere opacity measurement.
The invention relates to a 7-millimeter waveband broadband small-opening-angle shaped corrugated horn feed source which is characterized in that the feed source is a Gaussian shaped curve combined gradient groove depth mode conversion structure, the working frequency is 30-50GHz, and the relative bandwidth is 50%, the feed source consists of a Gaussian shaped section, a mode conversion section, a diameter change section, a circular waveguide, Gaussian shaped section corrugated grooves and mode conversion section corrugated grooves, wherein the number of the Gaussian shaped section (1) corrugated grooves is 32, the lower edge of the Gaussian shaped section (1) is connected with the upper edge of the mode conversion section (2), the inner diameter of the upper edge of the Gaussian shaped section (1) is 60.972mm, the inner diameter of the lower edge of the Gaussian shaped section is 22.958mm, and the length of the Gaussian shaped section is 89.404 mm; the number of the corrugated grooves of the mode conversion section (2) is 11, the lower edge of the mode conversion section (2) is connected with the upper edge of the diameter-variable section (3), the inner diameter of the upper edge of the mode conversion section (2) is 22.958mm, the inner diameter of the lower edge of the mode conversion section is 9.35mm, and the length of the mode conversion section is 30.791 mm; the lower edge of the variable-diameter section (3) is connected with the upper edge of the circular waveguide (4), the inner diameter of the upper edge of the variable-diameter section (3) is 9.35mm, the inner diameter of the lower edge is 8.5mm, the length is 1.921mm, the inner diameter of the circular waveguide (4) is 8.5mm, and the length is 7.495 mm; the Gaussian-shaped section corrugated groove (5) is embedded in the inner wall of the Gaussian-shaped section (1), the groove depth of the Gaussian-shaped section corrugated groove (5) is 1.874mm, and the groove length is 2.33 mm; the mode conversion section corrugated groove (6) is embedded in the inner wall of the mode conversion section (2), the groove depth of the mode conversion section corrugated groove (6) is 2.5mm, and the groove length is 2.33 mm.
The horn feed physical opening angle is 23.688 degrees.
The invention relates to a 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source, which has the working frequency of 30-50GHz, is a corrugated horn feed source with a Gaussian shaped curve combined with a gradual groove depth mode conversion structure, and is applied to a 7-millimeter-wave-band receiver system in the field of radio astronomy, and consists of Gaussian shaped sections, a mode conversion section, a diameter change section, a circular waveguide, Gaussian shaped section corrugated grooves and mode conversion section corrugated grooves, wherein the number of the Gaussian shaped section corrugated grooves is 32, the number of the mode conversion section corrugated grooves is 11, the feed source is a Gaussian shaped curve combined with a gradual groove depth mode conversion structure, the working frequency is 30-50GHz, the relative bandwidth is 50%, and the Gaussian shaped section adopts a Gaussian shaped curve structure impedance conversion mode to ensure the transmission of a main mode of the Gaussian shaped section; the mode conversion section realizes the conversion of the circular waveguide main mode into a corrugated structure mixed mode by changing the groove depth of a corrugated groove of the mode conversion section. The feed source physical field angle is 23.688 degrees, the return loss in the whole bandwidth range is below-12 dB, the main beam radiation directional diagram gain reaches above 19.9dB, the requirement of building a 7-millimeter wave band receiver system is met, and the feed source can be used as an independent antenna to carry out corresponding wave band atmosphere opacity measurement.
The invention relates to a 7mm waveband broadband small-opening-angle shaped corrugated horn feed source, which comprises the following components in design:
the Gaussian shaping section (1) adopts a Gaussian shaping curve structure impedance transformation mode to ensure the transmission of the main mold of the Gaussian shaping section, the number of corrugated grooves of the Gaussian shaping section (1) is 32, the groove depth is 1.874mm, the groove length is 2.33mm, and the Gaussian shaping curve meets the following relations:
wherein A is0Is the inner radius of the upper edge of the Gaussian-shaped section (1), A2Is the inner radius of the lower edge of the Gaussian-shaped section (1), theta1Is the opening angle, theta, of the mode change section (2)MIs the maximum tangential angle, delta, of the inner wall of the Gaussian-shaped section (1)1＝cos-1(tanθ1/tanθM)，L1Is the length of the mode change segment (2), L2＝δ1δ3/sinδ1，L3＝πδ3/4，δ1＝cos-1(tanθ1/tanθM)，δ2＝π/(2L3)，δ3＝(2/3)(A0-A2)/tanθM；
The mode conversion section (2) adopts a mode of changing the groove depth of a corrugated groove of the mode conversion section (2) to realize that a main mode of the circular waveguide (4) is converted into a mixed mode with a corrugated structure; the number of the corrugated grooves of the mode change section (2) is 11, the groove length is 2.33mm, and the groove depth from the upper edge to the lower edge of the mode change section (2) is respectively 1.874mm, 1.936mm, 1.999mm, 2.062mm, 2.124mm, 2.187mm, 2.249mm, 2.312mm, 2.375mm, 2.437mm and 2.5 mm;
the variable diameter section (3) is designed by adopting a linear variable diameter section, the length of the variable diameter section (3) is 1.921mm, the inner wall of the variable diameter section (3) is of a light wall structure, and the opening angle is 35.96 degrees;
the circular waveguide (4) is designed in a cylindrical shape, the inner diameter of the circular waveguide (4) is 8.5mm, the length of the circular waveguide is 7.495mm, and the lower edge of the circular waveguide (4) is used for being connected with other microwave devices such as an external orthogonal mode coupler and the like finally.
Drawings
FIG. 1 is an overall structural view of the present invention;
FIG. 2 is a graph of the return loss of the horn feed of the present invention in the entire band;
FIG. 3 is a 30GHz main beam pattern for the horn feed of the present invention;
FIG. 4 is a diagram of the feed source of the horn of the present invention in the E and H planes of 30 Ghz;
FIG. 5 is a main beam pattern of the horn feed of the present invention at 40 GHz;
FIG. 6 is a 40Ghz E-plane and H-plane directional pattern of the horn feed of the present invention;
FIG. 7 is a main beam pattern at 50GHz for the horn feed of the present invention;
fig. 8 shows the radiation pattern of the horn feed of the present invention in the E plane and H plane of 50 Ghz.
Detailed Description
Examples
The invention relates to a 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source, which has the working frequency of 30-50GHz, is a corrugated horn feed source with a Gaussian shaped curve combined with a gradual groove depth mode conversion structure, and is applied to a 7-millimeter-wave-band receiver system in the field of radio astronomy, and consists of Gaussian shaped sections, a mode conversion section, a diameter change section, a circular waveguide, Gaussian shaped section corrugated grooves and mode conversion section corrugated grooves, wherein the number of the Gaussian shaped sections 1 is 32, the lower edge of the Gaussian shaped section 1 is connected with the upper edge of a mode conversion section 2, the inner diameter of the upper edge of the Gaussian shaped section 1 is 60.972mm, the inner diameter of the lower edge is 22.958mm, and the length is 89.404 mm; the number of the corrugated grooves of the mode conversion section 2 is 11, the lower edge of the mode conversion section 2 is connected with the upper edge of the diameter-variable section 3, the inner diameter of the upper edge of the mode conversion section 2 is 22.958mm, the inner diameter of the lower edge of the mode conversion section is 9.35mm, and the length of the mode conversion section is 30.791 mm; the lower edge of the variable-diameter section 3 is connected with the upper edge of the circular waveguide 4, the inner diameter of the upper edge of the variable-diameter section 3 is 9.35mm, the inner diameter of the lower edge is 8.5mm, the length of the lower edge is 1.921mm, the inner diameter of the circular waveguide 4 is 8.5mm, and the length of the circular waveguide is 7.495 mm; the Gaussian-shaped section corrugated groove 5 is embedded in the inner wall of the Gaussian-shaped section 1, the groove depth of the Gaussian-shaped section corrugated groove 5 is 1.874mm, and the groove length is 2.33 mm; the mode conversion section corrugated groove 6 is embedded in the inner wall of the mode conversion section 2, the groove depth of the mode conversion section corrugated groove 6 is 2.5mm, and the groove length is 2.33 mm; the physical opening angle of the horn feed source is 23.688 degrees;
in the using process, referring to fig. 1, a radio signal enters the inside of the gaussian shaping section 1 through the upper edge of the gaussian shaping section 1 along a waveguide port, is transmitted to the mode conversion section 2 through the corrugated groove 5 of the gaussian shaping section, is transmitted to the diameter-changing section 3 through the corrugated groove 6 of the mode conversion section, and is transmitted to the round waveguide 4 through the smooth inner wall of the diameter-changing section 3 to complete signal transmission;
FIG. 2 is a return loss diagram of a feed source of a 7 mm-waveband broadband small-opening-angle shaped corrugated horn in a bandwidth range of 30-50GHz, and it can be seen from FIG. 2 that the return loss of the feed source in the whole bandwidth range is below-12 dB, and the return loss in the range of 32-50GHz can reach below-15 dB;
as can be seen from the results of the antenna main beam pattern of the 7 mm-band broadband small-opening-angle shaped corrugated horn feed source in fig. 3, 5 and 7, the 7 mm-band broadband small-opening-angle shaped corrugated horn feed source has a main beam width of 13.2 degrees (3dB) and a gain of 22.1dB at 30GHz, a main beam width of 19.7 degrees (3dB) and a gain of 19.9dB at 40GHz, and a main beam width of 13.1 degrees (3dB) and a gain of 23.2dB at 50 GHz;
as can be seen from the results of the E-plane pattern and the H-plane pattern of the antenna of the 7 mm-band broadband small-opening-angle shaped corrugated horn feed in fig. 4, 6, and 8, the E-plane pattern and the H-plane pattern of the 7 mm-band broadband small-opening-angle shaped corrugated horn feed at 30GHz, 40GHz, and 50GHz have good consistency.
The 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source provided by the invention has the advantages that the return loss and the antenna pattern performance reach expected indexes, the building requirement of a 7-millimeter-wave-band receiver system is met, and the feed source can be used as an independent antenna for carrying out corresponding-wave-band atmospheric opacity measurement.
Claims (2)
1. A7 mm waveband broadband small-opening-angle shaped corrugated horn feed source is characterized in that the feed source is a Gaussian shaped curve combined with a gradual change groove depth mode conversion structure, the working frequency is 30-50GHz, and the relative bandwidth is 50%, the feed source consists of a Gaussian shaped section, a mode conversion section, a diameter change section, a circular waveguide, Gaussian shaped section corrugated grooves and a mode conversion section corrugated groove, wherein the number of the Gaussian shaped section (1) corrugated grooves is 32, the lower edge of the Gaussian shaped section (1) is connected with the upper edge of the mode conversion section (2), the inner diameter of the upper edge of the Gaussian shaped section (1) is 60.972mm, the inner diameter of the lower edge of the Gaussian shaped section is 22.958mm, and the length of the Gaussian shaped section is 89.404 mm; the number of the corrugated grooves of the mode conversion section (2) is 11, the lower edge of the mode conversion section (2) is connected with the upper edge of the diameter-variable section (3), the inner diameter of the upper edge of the mode conversion section (2) is 22.958mm, the inner diameter of the lower edge of the mode conversion section is 9.35mm, and the length of the mode conversion section is 30.791 mm; the lower edge of the variable-diameter section (3) is connected with the upper edge of the circular waveguide (4), the inner diameter of the upper edge of the variable-diameter section (3) is 9.35mm, the inner diameter of the lower edge is 8.5mm, the length is 1.921mm, the inner diameter of the circular waveguide (4) is 8.5mm, and the length is 7.495 mm; the Gaussian-shaped section corrugated groove (5) is embedded in the inner wall of the Gaussian-shaped section (1), the groove depth of the Gaussian-shaped section corrugated groove (5) is 1.874mm, and the groove length is 2.33 mm; the mode conversion section corrugated groove (6) is embedded in the inner wall of the mode conversion section (2), the groove depth of the mode conversion section corrugated groove (6) is 2.5mm, and the groove length is 2.33 mm.
2. The feed source of the 7mm waveband broadband small-opening-angle shaped corrugated horn according to claim 1, wherein the physical opening angle of the feed source of the horn is 23.688 degrees.
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| CN202011444224.3A CN112615161A (en) | 2020-12-08 | 2020-12-08 | 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source |
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| CN202011444224.3A CN112615161A (en) | 2020-12-08 | 2020-12-08 | 7-millimeter-wave-band broadband small-opening-angle shaped corrugated horn feed source |
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Citations (5)
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|---|---|---|---|---|
| EP0024685A1 (en) * | 1979-08-22 | 1981-03-11 | Western Electric Company, Incorporated | Hybrid mode waveguiding member and hybrid mode feedhorn antenna |
| CN2481067Y (en) * | 2001-05-29 | 2002-03-06 | 信息产业部电子第五十四研究所 | High-quality wide frequency band double-groove deep corrugation loudspeaker feed source |
| CN101083356A (en) * | 2006-06-03 | 2007-12-05 | 无锡华信雷达工程有限责任公司 | C/Ku-Band shared wideband reception corrugated horn |
| US20140266948A1 (en) * | 2013-03-13 | 2014-09-18 | University Court Of The University Of St. Andrews | Compact corrugated feedhorn |
| CN105024171A (en) * | 2014-04-22 | 2015-11-04 | 中兴通讯股份有限公司 | Antenna and corrugated horn feed source thereof |
-
2020
- 2020-12-08 CN CN202011444224.3A patent/CN112615161A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0024685A1 (en) * | 1979-08-22 | 1981-03-11 | Western Electric Company, Incorporated | Hybrid mode waveguiding member and hybrid mode feedhorn antenna |
| CN2481067Y (en) * | 2001-05-29 | 2002-03-06 | 信息产业部电子第五十四研究所 | High-quality wide frequency band double-groove deep corrugation loudspeaker feed source |
| CN101083356A (en) * | 2006-06-03 | 2007-12-05 | 无锡华信雷达工程有限责任公司 | C/Ku-Band shared wideband reception corrugated horn |
| US20140266948A1 (en) * | 2013-03-13 | 2014-09-18 | University Court Of The University Of St. Andrews | Compact corrugated feedhorn |
| CN105024171A (en) * | 2014-04-22 | 2015-11-04 | 中兴通讯股份有限公司 | Antenna and corrugated horn feed source thereof |
Non-Patent Citations (2)
| Title |
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| 姜文禹: "Ka波段双槽波纹喇叭的设计", 《2017年全国微波毫米波会议论文集（下册）》 * |
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