CN104979638A - Dual-band and dual-polarization millimeter wave feed source - Google Patents
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Abstract
The invention provides a dual-band and dual-polarization millimeter wave feed source which comprises a radiation end, a Ka-band orthogonal mode coupling and a W-band orthogonal mode coupling. The radiation end and the couplings use a waveguide structure. Dual bands and dual polarization are realized through single caliber. A high band is located in the middle. Low bands carry out feeding from sides. A high-band dual-mode feed source is connected with an external orthogonal mode coupling. The low bands carry out feeding from a circular waveguide segment with increasing diameter. The dual-polarization feed source has a simple main structure, and breaks through the technical problems of the dual-band and dual-polarization millimeter wave feed source. In order to prevent crosstalk and improve the feed source performance, a filter is added on an output rectangular waveguide segment of a low-band orthogonal mode coupling. The filter is a low-pass filter which has low-band passband and high-band stop-band. Two kinds of polarization exit waveguide of two bands are respectively located in four directions of a major radiation waveguide axis, are in pairwise orthogonal, are staggered up and down, are not located in the same level, and are easily connected with rear end waveguide.
Description
Technical field
The invention belongs to target acquisition technical field, be specifically related to the millimeter wave feed being applied to double frequency millimeter wave cloud detection radar Cassegrain reflector antenna.
Background technology
Dual-band and dual-polarization millimeter wave feed as the primary radiator of double frequency millimeter wave cloud detection radar Cassegrain reflector antenna, for it provides effective irradiation.Double frequency millimeter wave cloud detection radar is development and the extension of millimeter wave cloud detection radar technology, is the product of detection demand of becoming more meticulous.
Carry out dual wavelength detection in early days and adopt dual radars, namely the radar of two different frequency ranges is started shooting simultaneously, detects same target.The maximum problem of this method is that what to be difficult to guarantee two radar detections is same target, and equipment amount is large, and operation maintenance requires high.Development adopts the two-wavelength radar of coplanar antennae, is the effective ways solved the problem.
The key of development double frequency millimeter wave cloud detection radar is the technological break-through of millimeter wave coplanar antennae, and for surface antenna, key is to break through dual-band and dual-polarization millimeter wave feed technology.Double frequency millimeter wave cloud detection radar is operated in Ka/W frequency range.At millimeter wave frequency band, particularly W frequency range, its wavelength is short, make the design of millimeter wave equipment, processing all face a new difficult problem.Due to millimeter wave himself, also limit the use of the measure much can taked in low-frequency range.
Dual-band dual-polarization feed is in Ku/Ka two-band, and Ka frequency range can adopt coaxial nested mode to be nested in Ku frequency range, and Ka frequency range adopts Filled Dielectrics loudspeaker to realize.If but this method is used in W frequency range, dielectric loss is difficult to bear.Even if adopt air dielectric metal waveguide, its loss also be can not ignore.Research shows W frequency range waveguide theory loss 3.82dB/m, in fact due to the problem of waveguide inwall fineness, even reaches 3 ~ 4 times of theoretical value, and experiment measured value is about 13dB/m.Therefore, just need to adopt all-metal construction in W frequency range, and simplify the structure of feed as far as possible.
Along with the development and application of double frequency millimeter wave cloud detection radar, studying a kind of dual-band and dual-polarization millimeter wave feed being applied to reflector antenna is the technical barrier faced at present.
Summary of the invention
In order to meet the instructions for use of double frequency millimeter wave cloud detection radar, the invention provides a kind of dual-band and dual-polarization millimeter wave feed.
Dual-band and dual-polarization millimeter wave feed is made up of spoke side, Ka frequency range orthomode coupler and W frequency range orthomode coupler;
Described spoke side is made up of the horn body 1 connected successively and Ka frequency range waveguide 2, is the spoke side of Ka frequency range and the spoke side of W frequency range;
Described Ka frequency range orthomode coupler is made up of W frequency range multimode horn, Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6; Described W frequency range multimode horn is made up of the Ka frequency range waveguide 2 connected successively, transition circle frustum 4 and W frequency range waveguide 3; Described Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6 are staggered to be respectively located in Ka frequency range waveguide 2, and Ka frequency range first feed waveguide 5 is mutually vertical with Ka frequency range second feed waveguide 6; And the port of export of the port of export of Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6 is equipped with filter 11;
Described W frequency range orthomode coupler is made up of W frequency range waveguide 3, W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8; Described W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 interlock and are located in W frequency range waveguide 3, and W frequency range first feed waveguide 7 is mutually vertical with W frequency range second feed waveguide 8;
Described Ka frequency range waveguide 2 and W frequency range waveguide 3 are circular waveguide, and the diameter of W frequency range waveguide 3 is less than Ka frequency range waveguide 2;
The one end of the Ka frequency range waveguide 2 that the small-caliber end of described horn body 1 is connected to, the other end of Ka frequency range waveguide 2 is connected to one end of W frequency range waveguide 3 by transition circle frustum 4, the other end of W frequency range waveguide 3 is bottom, and closes; W frequency range waveguide 3 is the feed waveguide of W frequency range multimode horn, and Ka frequency range waveguide 2 is the transmission waveguide of W frequency range multimode horn.
Described horn body 1 is perpendicular Conical Corrugated Horn, and be laid with plural along the axisymmetric wave groove in horn body center in its body, the groove depth of described wave groove is not less than quarter-wave, and groove width is 1/1/3rd ~ bis-of the groove cycle.
The diameter of described W frequency range waveguide 3 is 1/1/3rd ~ bis-of the diameter of Ka frequency range waveguide 2.
The tapering of described transition circle frustum 4 is 25 ~ 35 degree.
Described filter 11 is Ka frequency range passband and has the low pass filter of W frequency range stopband.
Described Ka frequency range first feed waveguide 5, Ka frequency range second feed waveguide 6, W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 lay respectively at the axial four direction for benchmark with described millimeter wave feed.
The Waveguide end face of described Ka frequency range first feed waveguide 5, Ka frequency range second feed waveguide 6 is transformed to axis being parallel in the rectangular waveguide of Ka frequency range waveguide 2 by 90 ° of corner cut elbow rectangular waveguides.
The Waveguide end face of described W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 all with the rectangular waveguide axes normal of Ka frequency range waveguide 3.
Advantageous Effects of the present invention embodies in the following areas:
Dual-band and dual-polarization millimeter wave feed of the present invention adopts all-wave guide structure, and single port footpath realizes dual-band and dual-polarization; High band is positioned at centre, and low-frequency range is feed from the side, considers the feature of millimeter wave, and the structure of feed is simpler, then no matter the overcoming or the guarantee of last performance of difficulty of processing, all more likely.Therefore high band bimodulus feed external orthomode coupler is selected, the most simple structure scheme of the circular waveguide section feed that low-frequency range increases from diameter.Bipolar feed source agent structure is succinct, all-wave guide structure; Breach dual-band and dual-polarization millimeter wave feed technical barrier.In addition dual polarization requires that feed structure must be two, if same " highly " at a distance of 90 ° of feeds, the isolation of two kinds of polarization is difficult to ensure, a guide wavelength of must being separated by, just can ensure that two kinds of polarization isolation reach requirement.Termination orthomode coupler after high band.
The feature of Ka frequency range orthomode coupler of the present invention is conventional orthogonal mode coupler and dual mode horn to be integrated as a kind of novel orthomode coupler, this new structure and alternative probe feed type orthomode coupler, also alternative waveguide direct feeding type orthomode coupler.As shown in Figure 1 and Figure 4, described Ka frequency range orthomode coupler W frequency range dual mode horn substitutes the waveguide short face of conventional orthogonal mode coupler, wherein a kind of feed mouth distance short circuit face of polarization is comparatively near, the feed mouth of another kind of polarization with it orthogonal 90 ° and on move a wavelength.
Feed of the present invention, W-waveband adopts traditional dual mode horn, and as shown in Figure 1, it is its feed waveguide that dual mode horn main body comprises W frequency range waveguide 3, transition circle frustum 4 and Ka frequency range waveguide 2, W frequency range waveguide 3, and Ka frequency range waveguide 2 is its transmission waveguide.Described W frequency range feed will realize dual polarization, dual polarization requires that feed structure must be two, if at same height at a distance of 90 ° of feeds, the isolation of two kinds of polarization is difficult to ensure, must to be separated by a guide wavelength, can ensure that two polarization isolation reach requirement, W frequency range rear end can connect orthomode coupler and realize dual polarization.For ensureing bipolar feed source rational deployment, W frequency range orthomode coupler structure selects conventional waveguide direct feeding type structure as shown in Figure 1 and Figure 4.The orthomode coupler of described W frequency range utilizes the feed waveguide of W frequency range multimode horn as primary radiation waveguide, namely both share W frequency range waveguide 3, W frequency range first feed waveguide of the orthomode coupler of described W frequency range and W frequency range second feed waveguide are respectively the outlet waveguide of two kinds of polarization of W frequency range, and perpendicular to primary radiation waveguide, also waveguide outlet can be produced a desired effect by corresponding warp architecture.Two kinds of polarization outlet waveguides of described Ka frequency range and two kinds of polarization outlet waveguides of W frequency range lay respectively at the four direction of primary radiation waveguide, and pairwise orthogonal, interlock up and down, not in same level, be convenient to the connection with rear waveguide.
Because the waveguide of Ka frequency range can transmit a part of W frequency band signals equally, for preventing crosstalk, improving feed performance, increasing filter in the output rectangular waveguide section of Ka frequency range orthomode coupler, making Ka frequency range passband, W frequency range stopband.Final Dual-band dual-polarization feed agent structure is succinct, and all-wave guide structure, can meet design objective requirement, comprises the requirement of bearing power, and difficulty of processing is also in tolerance interval.
Mentality of designing of the present invention is not limited only to the design of Ka/W Dual-band dual-polarization feed, and described feed may be used for other two-band Feed Designs, also can be used for other reflector situation except Cassegrain reflector, as primary radiator.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that Fig. 1 adds metallic walls and along the cutaway view of W frequency range multimode horn and Ka frequency range first feed waveguide 5 axis;
Fig. 3 is spoke side and Ka frequency range orthomode coupler structural representation;
Fig. 4 is the simplified structure schematic diagram of Fig. 1;
Fig. 5 is Cassegrain antenna schematic diagram;
Fig. 6 is the main polarization and Cross polarization pattern of Ka frequency range center frequency point of the present invention;
Fig. 7 is Ka frequency range of the present invention two kinds polarization standing wave curve chart;
Fig. 8 is the main polarization and Cross polarization pattern of W frequency range center frequency point of the present invention;
Fig. 9 is W frequency range of the present invention two kinds polarization standing wave curve chart.
Sequence number in upper Fig. 1-4: horn body 1, Ka frequency range waveguide 2, W frequency range waveguide 3, transition circle frustum 4, Ka frequency range first feed waveguide 5, Ka frequency range second feed waveguide 6, W frequency range first feed waveguide 7, W frequency range second feed waveguide 8, Ka frequency range first exports waveguide 9, Ka frequency range second exports waveguide 10, filter 11.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.
Embodiment
See Fig. 1, dual-band and dual-polarization millimeter wave feed is made up of spoke side, Ka frequency range orthomode coupler and W frequency range orthomode coupler.Wherein, spoke side is made up of the horn body 1 connected successively and Ka frequency range waveguide 2, is the spoke side of Ka frequency range and the spoke side of W frequency range.See Fig. 2, horn body 1 is perpendicular Conical Corrugated Horn, and be laid with four in its body along the axisymmetric wave groove in horn body center, the groove depth of wave groove is not less than quarter-wave, and groove width is 1/2nd of the groove cycle.
Ka frequency range orthomode coupler is made up of W frequency range multimode horn, Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6.Be made up of the Ka frequency range waveguide 2 connected successively, transition circle frustum 4 and W frequency range waveguide 3 see Fig. 3, W frequency range multimode horn; The one end of the Ka frequency range waveguide 2 that the small-caliber end of horn body 1 is connected to, the other end of Ka frequency range waveguide 2 is connected to one end of W frequency range waveguide 3 by transition circle frustum 4, the other end of W frequency range waveguide 3 is bottom, and closes; W frequency range waveguide 3 is the feed waveguide of W frequency range multimode horn, and Ka frequency range waveguide 2 is the transmission waveguide of W frequency range multimode horn.Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6 are staggered to be respectively positioned in Ka frequency range waveguide 2, and Ka frequency range first feed waveguide 5 is mutually vertical with Ka frequency range second feed waveguide 6; And the port of export of the port of export of Ka frequency range first feed waveguide 5 and Ka frequency range second feed waveguide 6 is equipped with filter 11.Filter 11 is Ka frequency range passband and has the low pass filter of W frequency range stopband.
Be made up of W frequency range waveguide 3, W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 see Fig. 4, W frequency range orthomode coupler; W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 interlock and are positioned in W frequency range waveguide 3, and W frequency range first feed waveguide 7 is mutually vertical with W frequency range second feed waveguide 8.
Circular waveguide is see Fig. 1 and Fig. 2, Ka frequency range waveguide 2 and W frequency range waveguide 3; The diameter of W frequency range waveguide 3 is 0.4844 times of the diameter of Ka frequency range waveguide 2.The tapering of transition circle frustum 4 is 30 degree.
The axial four direction for benchmark with described millimeter wave feed is laid respectively at see Fig. 3, Ka frequency range first feed waveguide 5, Ka frequency range second feed waveguide 6, W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8.
The Waveguide end face of Ka frequency range first feed waveguide 5, Ka frequency range second feed waveguide 6 is transformed to axis being parallel in the rectangular waveguide of Ka frequency range waveguide 2 by 90 ° of corner cut elbow rectangular waveguides.The Waveguide end face of W frequency range first feed waveguide 7 and W frequency range second feed waveguide 8 all with the rectangular waveguide axes normal of Ka frequency range waveguide 3.
For convenience of engineer applied, the outlet waveguide of Ka and W frequency range two kinds polarization lays respectively at the four direction along feed axial centre symmetry, and exit position is not all at same horizontal plane, is convenient to the connection with feeder line waveguide.The output termination filter of Ka frequency range, effectively prevents crosstalk and ensure that the polarization isolation of high band, improve the overall performance of feed.
See Fig. 5, for Cassegrain antenna schematic diagram, primary mirror bore is D, secondary mirror bore is DS, primary mirror is the paraboloid of revolution, secondary mirror is hyperboloid, this example gets D/DS=10, O1, O2 are two focuses of secondary mirror, wherein O1 is the focus of primary mirror, and the phase center of Dual-band dual-polarization feed of the present invention is positioned over O1, and will ensure that blocking of Dual-band dual-polarization feed is less than blocking of secondary mirror, except the parameters of major-minor mirror wanting choose reasonable Cassegrain reflector, also to carry out rational deployment to Dual-band dual-polarization feed.The spoke side of dual-band and dual-polarization millimeter wave feed of the present invention is the radiator of whole feed on the one hand, the Feed Horn body of Ka frequency range on the other hand, its important technological parameters depends on groove depth and the groove width of wave groove, groove depth is advisable to be not less than quarter-wave, and groove width gets about 1/2nd of the groove cycle.
As seen from Figure 6, the main polarization and Cross polarization pattern of Ka frequency range center frequency point of the present invention, gain is 13.5dB, and wave beam etc. are changed ideal; As seen from Figure 7, Ka frequency range of the present invention two feed mouth standing wave curve charts, are all less than 1.2; As seen from Figure 8, the main polarization and Cross polarization pattern of W frequency range center bin of the present invention, gain is 15.5dB, and wave beam etc. are changed ideal; As seen from Figure 9, W frequency range of the present invention two kinds polarization standing wave curve chart, is all less than 1.3.
As can be seen from Fig. 6-9, feed is good in Ka and W band operation characteristic, and directional diagram E face and H ground roll bundle etc. are changed good, and two-band index meets reflecting surface job requirement.
Above said content is Dual-band dual-polarization feed of the present invention; be not limited to the present invention; without departing from the inventive concept of the premise, some simple deductions and replacement can also be done, all be included within the determined invention protection range of claims of the present invention.
Claims (8)
1. dual-band and dual-polarization millimeter wave feed, is characterized in that: be made up of spoke side, Ka frequency range orthomode coupler and W frequency range orthomode coupler;
Described spoke side is made up of the horn body connected successively (1) and Ka frequency range waveguide (2), is the spoke side of Ka frequency range and the spoke side of W frequency range;
Described Ka frequency range orthomode coupler is made up of W frequency range multimode horn, Ka frequency range first feed waveguide (5) and Ka frequency range second feed waveguide (6); Described W frequency range multimode horn is made up of the Ka frequency range waveguide (2) connected successively, transition circle frustum (4) and W frequency range waveguide (3); Described Ka frequency range first feed waveguide (5) and Ka frequency range second feed waveguide (6) are staggered to be respectively located in Ka frequency range waveguide (2), and Ka frequency range first feed waveguide (5) is mutually vertical with Ka frequency range second feed waveguide (6); And the port of export of the port of export of Ka frequency range first feed waveguide (5) and Ka frequency range second feed waveguide (6) is equipped with filter (11);
Described W frequency range orthomode coupler is made up of W frequency range waveguide (3), W frequency range first feed waveguide (7) and W frequency range second feed waveguide (8); Described W frequency range first feed waveguide (7) and W frequency range second feed waveguide (8) interlock and are located in W frequency range waveguide (3), and W frequency range first feed waveguide (7) is mutually vertical with W frequency range second feed waveguide (8);
Described Ka frequency range waveguide (2) and W frequency range waveguide (3) are circular waveguide, and the diameter of W frequency range waveguide (3) is less than Ka frequency range waveguide (2);
The one end of the Ka frequency range waveguide (2) that the small-caliber end of described horn body (1) is connected to, the other end of Ka frequency range waveguide (2) is connected to one end of W frequency range waveguide (3) by transition circle frustum (4), the other end of W frequency range waveguide (3) is bottom, and closes; The feed waveguide that W frequency range waveguide (3) is W frequency range multimode horn, the transmission waveguide that Ka frequency range waveguide (2) is W frequency range multimode horn.
2. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterized in that: described horn body (1) is perpendicular Conical Corrugated Horn, be laid with plural along the axisymmetric wave groove in horn body center in its body, the groove depth of described wave groove is not less than quarter-wave, and groove width is 1/1/3rd ~ bis-of the groove cycle.
3. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: the diameter of described W frequency range waveguide (3) is 1/1/3rd ~ bis-of the diameter of Ka frequency range waveguide (2).
4. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: the tapering of described transition circle frustum (4) is 25 ~ 35 degree.
5. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: described filter (11) is for Ka frequency range passband and have the low pass filter of W frequency range stopband.
6. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: described Ka frequency range first feed waveguide (5), Ka frequency range second feed waveguide (6), W frequency range first feed waveguide (7) and W frequency range second feed waveguide (8) lay respectively at the axial four direction for benchmark with described millimeter wave feed.
7. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: the Waveguide end face of described Ka frequency range first feed waveguide (5), Ka frequency range second feed waveguide (6) is transformed to axis being parallel in the rectangular waveguide of Ka frequency range waveguide (2) by 90 ° of corner cut elbow rectangular waveguides.
8. dual-band and dual-polarization millimeter wave feed according to claim 1, is characterized in that: the Waveguide end face of described W frequency range first feed waveguide (7) and W frequency range second feed waveguide (8) all with the rectangular waveguide axes normal of Ka frequency range waveguide (3).
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| CN105529518A (en) * | 2015-12-18 | 2016-04-27 | 航天恒星科技有限公司 | Orthogonal coupler |
| CN105896088A (en) * | 2016-04-11 | 2016-08-24 | 湖南航天环宇通信科技股份有限公司 | Ku/Ka dual-band transmitting-receiving community antenna feed source assembly |
| CN105958205A (en) * | 2016-06-20 | 2016-09-21 | 中国电子科技集团公司第三十八研究所 | Multiband dual-polarized high-power feed source |
| CN106027141A (en) * | 2016-07-06 | 2016-10-12 | 安徽四创电子股份有限公司 | Mobile satellite communication duplex component |
| CN107643522A (en) * | 2017-09-19 | 2018-01-30 | 中国电子科技集团公司第三十八研究所 | A kind of spaceborne sexual intercourse instrumentation radar system of Dual-band dual-polarization |
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| CN109103596A (en) * | 2018-08-17 | 2018-12-28 | 中国科学院电子学研究所 | Dual polarization high-isolation antenna and satellite-borne synthetic aperture radar source scaler |
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| CN109301499A (en) * | 2018-11-13 | 2019-02-01 | 南京信息工程大学 | Ka/W dual-band and dual-polarization high-isolation high-gain Cassegrain antenna |
| CN109786970A (en) * | 2019-02-01 | 2019-05-21 | 中国电子科技集团公司第三十九研究所 | A kind of X/Ka multiple frequency broad band multimode feed |
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| CN112421226A (en) * | 2020-11-11 | 2021-02-26 | 中国电子科技集团公司第二十九研究所 | Dual-frequency dual-polarization high-power antenna |
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| CN115064856A (en) * | 2022-05-12 | 2022-09-16 | 中国电子科技集团公司第五十四研究所 | W-waveband self-tracking mode coupler |
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