CN104979638B - Dual-band and dual-polarization millimeter wave feed - Google Patents
Dual-band and dual-polarization millimeter wave feed Download PDFInfo
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Abstract
The invention provides a kind of dual-band and dual-polarization millimeter wave feed, including spoke side, Ka frequency ranges orthomode coupler and W frequency range orthomode couplers, using waveguiding structure, single port footpath realizes dual-band and dual-polarization.High band is located at centre, and low-frequency range is fed from side；The external orthomode coupler of high band bimodulus feed, low-frequency range is fed from the increased circular waveguide section of diameter.Bipolar feed source agent structure is succinct, breaches dual-band and dual-polarization millimeter wave feed technical barrier.To prevent crosstalk, feed performance is improved, in the output rectangular waveguide section increase wave filter of low-frequency range orthomode coupler, wave filter is with low-frequency range passband, the low pass filter of high band stopband.Two kinds of polarization outlet waveguides of two kinds of frequency ranges are located at the four direction of primary radiation waveguide axis, and pairwise orthogonal respectively, interlock up and down, not in same level, are easy to the connection with rear waveguide.
Description
Technical field
The invention belongs to target acquisition technical field, and in particular to anti-applied to double frequency millimeter wave cloud detection radar Cassegrain
Penetrate the millimeter wave feed of surface antenna.
Background technology
Dual-band and dual-polarization millimeter wave feed as double frequency millimeter wave cloud detection radar Cassegrain reflector antenna primary spoke
Emitter, effective irradiation is provided for it.Double frequency millimeter wave cloud detection radar is the development and extension of millimeter wave cloud detection radar technology, is
The product for the detection demand that becomes more meticulous.
Early stage carries out dual wavelength detection and uses the radar of the different frequency range of dual radars, i.e., two to start shooting simultaneously, to same target
Detected.The problem of this method is maximum is that to be difficult to ensure that two radar detections is same target, and equipment amount is big, operation
Maintenance requirement is high.The two-wavelength radar using coplanar antennae is developed, is the effective ways solved the above problems.
The key for developing double frequency millimeter wave cloud detection radar is the technological break-through of millimeter wave coplanar antennae, 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 ranges.In millimeter
Wave frequency section, particularly W frequency ranges, its wavelength are short so that design, the processing of millimeter wave equipment all suffer from new problem.Due to millimeter
Ripple its own the characteristics of, also limit the use of many measures that can be taken in low-frequency range.
Dual-band dual-polarization feed can be nested in Ku frequency ranges in Ku/Ka two-bands, Ka frequency ranges using coaxial nested mode
Interior, Ka frequency ranges are realized using Filled Dielectrics loudspeaker.But if this method is used in W frequency ranges, dielectric loss is difficult to bear.Even if
Using air dielectric metal waveguide, its loss also be can not ignore.Research shows that 3.82dB/m is lost in W frequency ranges waveguide theory, actual
On due to waveguide inwall finish the problem of, even up to the 3~4 of theoretical value times, experiment measured value is about 13dB/m.Therefore,
It is accomplished by using all-metal construction in W frequency ranges, and simplifies the structure of feed as far as possible.
With the development and application of double frequency millimeter wave cloud detection radar, a kind of dual-band and dual-polarization applied to reflector antenna is studied
Millimeter wave feed is the technical barrier faced at present.
The content of the invention
In order to meet the use requirement of double frequency millimeter wave cloud detection radar, the present invention provides a kind of dual-band and dual-polarization millimeter wave feedback
Source.
Dual-band and dual-polarization millimeter wave feed is by spoke side, Ka frequency ranges orthomode coupler and W frequency range orthomode coupler groups
Into；
The spoke side is made up of the horn body 1 being sequentially connected and Ka frequency ranges waveguide 2, be both Ka frequency ranges spoke side and
The spoke side of W frequency ranges；
The Ka frequency ranges orthomode coupler is by W frequency ranges multimode horn, the first feed waveguide of Ka frequency ranges 5 and Ka frequency ranges second
Feed waveguide 6 is constituted；The W frequency ranges multimode horn is by the Ka frequency ranges waveguide 2 being sequentially connected, the transition frustum of a cone 4 and W frequency range waveguides
3 are constituted；First feed waveguide of Ka frequency ranges 5 and the second feed waveguide of Ka frequency ranges 6 are staggeredly located in Ka frequency ranges waveguide 2 respectively,
The first feed waveguide of Ka frequency ranges 5 and the second feed waveguide of Ka frequency ranges 6 are mutually perpendicular to；And the outlet of the first feed waveguide of Ka frequency ranges 5
The port of export of end and the second feed waveguide of Ka frequency ranges 6 is equipped with wave filter 11；
The W frequency ranges orthomode coupler feeds ripple by W frequency ranges waveguide 3, the first feed waveguide of W frequency ranges 7 and W frequency ranges second
Lead 8 compositions；First feed waveguide of W frequency ranges 7 and the second feed waveguide of W frequency ranges 8 are staggeredly located in W frequency ranges waveguide 3, W frequency ranges
First feed waveguide 7 and the second feed waveguide of W frequency ranges 8 are mutually perpendicular to；
The Ka frequency ranges waveguide 2 and W frequency ranges waveguide 3 are circular waveguide, and the diameter of W frequency ranges waveguide 3 is less than Ka frequency range ripples
Lead 2；
The one end for the Ka frequency ranges waveguide 2 that the small-caliber end of the horn body 1 is connected to, the other end of Ka frequency ranges waveguide 2 leads to
The transition frustum of a cone 4 is connected to one end of W frequency ranges waveguide 3, and the other end of W frequency ranges waveguide 3 is bottom, and is closed；W frequency range waveguides
3 be the feed waveguide of W frequency range multimode horns, and Ka frequency ranges waveguide 2 is the transmission waveguide of W frequency range multimode horns.
The horn body 1 is perpendicular Conical Corrugated Horn, and it is laid with more than two substantially symmetrical about its central axis along horn body in vivo
Wave groove, the groove depth of the wave groove is not less than the wavelength of a quarter Ka frequency ranges, groove width for the groove cycle 1/3rd~
1/2nd.
The diameter of the W frequency ranges waveguide 3 is 1st/1/3rd~bis- of the diameter of Ka frequency ranges waveguide 2.
The taper of the transition frustum of a cone 4 is 25~35 degree.
The wave filter 11 is Ka frequency ranges passband and the low pass filter with W frequency range stopbands.
First feed waveguide of Ka frequency ranges 5, the second feed waveguide of Ka frequency ranges 6, the first feed waveguide of W frequency ranges 7 and W frequency ranges
Second feed waveguide 8 is located at the four direction on the basis of the axial direction of the millimeter wave feed respectively.
First feed waveguide of Ka frequency ranges 5, the Waveguide end face of the second feed waveguide of Ka frequency ranges 6 are by 90 ° of corner cut elbows
Rectangular waveguide is transformed to diameter parallel in the rectangular waveguide of Ka frequency ranges waveguide 2.
The Waveguide end face of first feed waveguide of W frequency ranges 7 and the second feed waveguide of W frequency ranges 8 with Ka frequency ranges waveguide 3
Rectangular waveguide axis is vertical.
The advantageous effects of the present invention embody in the following areas：
The dual-band and dual-polarization millimeter wave feed of the present invention uses all-wave guide structure, and dual-band and dual-polarization is realized in single port footpath；High frequency
Section is located at centre, and low-frequency range is fed from side, it is contemplated that the characteristics of millimeter wave, the structure of feed is simpler, then no matter difficult processing
Degree overcome or last performance guarantee, all more likely.Therefore the selection external orthogonal mode coupling of high band bimodulus feed
Device, simplest structure scheme of the low-frequency range from the increased circular waveguide section feed of 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
In same " height " at a distance of 90 ° of feeds, the isolation of two kinds of polarization it is difficult to ensure that, it is necessary to be separated by a waveguide wavelength, just can be with
Ensure that two kinds of polarization isolations reach requirement.Orthomode coupler is terminated after high band.
The characteristics of Ka frequency ranges orthomode coupler of the present invention, is conventional orthogonal mode coupler and dual mode horn phase
A kind of new orthomode coupler is combined into, this new structure is alternative probe feed type orthomode coupler, can also be replaced
For waveguide direct feeding type orthomode coupler.As shown in Figure 1 and Figure 4, Ka frequency ranges orthomode coupler W frequency range bimodulus
Loudspeaker substitute the waveguide short face of conventional orthogonal mode coupler, and the short-circuit face of feed mouthful distance of one of which polarization is nearer, another
Plant orthogonal 90 ° of the feed mouthful of polarization and move up a wavelength.
Feed of the present invention, W-waveband is using traditional dual mode horn, as shown in figure 1, dual mode horn main body includes W frequency ranges
Waveguide 3, the transition frustum of a cone 4 and Ka frequency ranges waveguide 2, W frequency ranges waveguide 3 are its feed waveguide, and Ka frequency ranges waveguide 2 is its transmission wave
Lead.The W frequency ranges feed will realize dual polarization, and dual polarization requires that feed structure must be two, if in same height apart
90 ° feed, two kinds polarization isolation it is difficult to ensure that, it is necessary to be separated by a waveguide wavelength, it is ensured that two polarization isolations reach
It is required that, W frequency ranges rear end can connect orthomode coupler and realize dual polarization.To ensure bipolar feed source rational deployment, W frequency ranges are orthogonal
Mode coupler structure is from conventional waveguide direct feeding type structure as shown in Figure 1 and Figure 4.The orthogonal mode coupling of the W frequency ranges
Device is by the use of the feed waveguide of W frequency range multimode horns as primary radiation waveguide, i.e., both share W frequency ranges waveguides 3, the W frequency ranges
The feed waveguide of W frequency ranges first and the feed waveguide of W frequency ranges second of orthomode coupler are respectively the outlet of two kinds of polarization of W frequency ranges
Waveguide, and perpendicular to primary radiation waveguide, by corresponding warp architecture waveguide outlet can also be produced a desired effect.Institute
State two kinds of polarization outlet waveguides of Ka frequency ranges and two kinds of polarization outlet waveguides of W frequency ranges are located at four sides of primary radiation waveguide respectively
To, and pairwise orthogonal, interlock up and down, not in same level, be easy to the connection with rear waveguide.
Because the waveguide of Ka frequency ranges can equally transmit a part of W frequency band signals, to prevent crosstalk, feed performance is improved,
The output rectangular waveguide section increase wave filter of Ka frequency range orthomode couplers so that Ka frequency range passbands, W frequency range stopbands.Final
Dual-band dual-polarization feed agent structure is succinct, all-wave guide structure, can meet design objective requirement, including bear wanting for power
Ask, 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 feeds, and the feed can be used for other
Two-band Feed Design, also available for other reflector situations in addition to Cassegrain reflector, is used as primary radiator.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is that Fig. 1 adds metallic walls and along W frequency ranges multimode horn and the sectional view of the axial direction of the first feed waveguide of Ka frequency ranges 5；
Fig. 3 is spoke side and Ka frequency range orthomode coupler structural representations；
Fig. 4 is Fig. 1 simplification structural representation；
Fig. 5 is Cassegrain antenna schematic diagram；
Fig. 6 is that Ka frequency ranges center frequency point of the present invention is main polarization and Cross polarization pattern；
Fig. 7 is two kinds of polarization standing wave curve maps of Ka frequency ranges of the present invention；
Fig. 8 is that W frequency ranges center frequency point of the present invention is main polarization and Cross polarization pattern；
Fig. 9 is two kinds of polarization standing wave curve maps of W frequency ranges of the present invention.
Sequence number in figure 1 above -4：Horn body 1, Ka frequency ranges waveguide 2, W frequency ranges waveguide 3, the transition frustum of a cone 4, Ka frequency ranges first are presented
Electric waveguide 5, the second feed waveguide of Ka frequency ranges 6, the first feed waveguide of W frequency ranges 7, the second feed waveguide of W frequency ranges 8, Ka frequency ranges first
Export waveguide 9, Ka frequency range second outlets waveguide 10, wave filter 11.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment.
Embodiment
Referring to Fig. 1, dual-band and dual-polarization millimeter wave feed is by spoke side, Ka frequency ranges orthomode coupler and W frequency range orthogonal modes
Coupler is constituted.Wherein, spoke side is made up of the horn body 1 being sequentially connected and Ka frequency ranges waveguide 2, is both the spoke side of Ka frequency ranges
It is the spoke side of W frequency ranges again.Referring to Fig. 2, horn body 1 is perpendicular Conical Corrugated Horn, and it is laid with four along along horn body in vivo
The axisymmetric wave groove of the heart, the groove depth of wave groove is not less than the wavelength of a quarter Ka frequency ranges, groove width for the groove cycle two/
One.
Ka frequency ranges orthomode coupler is fed by W frequency ranges multimode horn, the first feed waveguide of Ka frequency ranges 5 and Ka frequency ranges second
Waveguide 6 is constituted.Referring to Fig. 3, W frequency ranges multimode horn is by the Ka frequency ranges waveguide 2 being sequentially connected, the transition frustum of a cone 4 and W frequency range waveguides
3 are constituted；The one end for the Ka frequency ranges waveguide 2 that the small-caliber end of horn body 1 is connected to, the other end of Ka frequency ranges waveguide 2 passes through transition
The frustum of a cone 4 is connected to one end of W frequency ranges waveguide 3, and the other end of W frequency ranges waveguide 3 is bottom, and is closed；W frequency ranges waveguide 3 is W frequencies
The feed waveguide of section multimode horn, Ka frequency ranges waveguide 2 is the transmission waveguide of W frequency range multimode horns.The first feed waveguide of Ka frequency ranges 5
Staggeredly it is located at respectively in Ka frequency ranges waveguide 2 with the second feed waveguide of Ka frequency ranges 6, the first feed waveguide of Ka frequency ranges 5 and Ka frequency ranges the
Two feed waveguides 6 are mutually perpendicular to；And the outlet of the port of export and the second feed waveguide of Ka frequency ranges 6 of the first feed waveguide of Ka frequency ranges 5
End is equipped with wave filter 11.Wave filter 11 is Ka frequency ranges passband and the low pass filter with W frequency range stopbands.
Referring to Fig. 4, W frequency ranges orthomode coupler is presented by W frequency ranges waveguide 3, the first feed waveguide of W frequency ranges 7 and W frequency ranges second
Electric waveguide 8 is constituted；The first feed waveguide of W frequency ranges 7 and the second feed waveguide of W frequency ranges 8 are staggeredly located in W frequency ranges waveguide 3, W frequency ranges
First feed waveguide 7 and the second feed waveguide of W frequency ranges 8 are mutually perpendicular to.
Referring to Fig. 1 and Fig. 2, Ka frequency ranges waveguide 2 and W frequency ranges waveguide 3 are circular waveguide；The diameter of W frequency ranges waveguide 3 is Ka frequencies
0.4844 times of the diameter of section waveguide 2.The taper of the transition frustum of a cone 4 is 30 degree.
Referring to Fig. 3, the first feed waveguide of Ka frequency ranges 5, the second feed waveguide of Ka frequency ranges 6, the first feed waveguide of W frequency ranges 7 and W
The second feed waveguide of frequency range 8 is located at the four direction on the basis of the axial direction of the millimeter wave feed respectively.
The first feed waveguide of Ka frequency ranges 5, the Waveguide end face of the second feed waveguide of Ka frequency ranges 6 are by 90 ° of corner cut elbow rectangles
Waveguide is transformed to diameter parallel in the rectangular waveguide of Ka frequency ranges waveguide 2.The first feed waveguide of W frequency ranges 7 and the feed ripple of W frequency ranges second
The Waveguide end face for leading 8 is vertical with the rectangular waveguide axis of Ka frequency ranges waveguide 3.
For convenience of engineer applied, the outlet waveguide of two kinds of polarization of Ka and W frequency ranges is respectively positioned at symmetrical along feed axial centre
Four direction, and the connection with feeder line waveguide is easy in outlet port not in same horizontal plane.The output termination of Ka frequency ranges
Wave filter, effectively prevents crosstalk and ensure that the polarization isolation of high band, improve the overall performance of feed.
It is Cassegrain antenna schematic diagram referring to Fig. 5, primary mirror bore is D, and secondary mirror bore is DS, and primary mirror is rotary parabolic
Face, secondary mirror is hyperboloid, and this example takes two focuses that D/DS=10, O1, O2 are secondary mirror, and wherein O1 is the focus of primary mirror, the present invention
The phase center of the Dual-band dual-polarization feed is positioned over O1, and to ensure the blocking less than secondary mirror of Dual-band dual-polarization feed
Block, in addition to wanting the parameters of major-minor mirror of reasonable selection Cassegrain reflector, also Dual-band dual-polarization is presented
Source carries out rational deployment.On the one hand the spoke side of dual-band and dual-polarization millimeter wave feed of the present invention is the radiation of whole feed
Device, is on the other hand the Feed Horn body of Ka frequency ranges, and its important technological parameters depends on the groove depth and groove width of wave groove, groove depth with
It is advisable not less than quarter-wave, groove width takes 1/2nd or so of groove cycle.
As seen from Figure 6, Ka frequency ranges center frequency point of the present invention is main polarization and Cross polarization pattern, and gain is 13.5dB, ripple
Beam etc. is changed ideal；As seen from Figure 7, two feed mouth standing wave curve maps of Ka frequency ranges of the present invention, respectively less than 1.2；Can by Fig. 8
See, W frequency ranges center bin of the present invention is main polarization and Cross polarization pattern, gain is 15.5dB, wave beam etc. is changed ideal；By
Fig. 9 is visible, two kinds of polarization standing wave curve maps of W frequency ranges of the present invention, respectively less than 1.3.
From Fig. 6-9 as can be seen that feed is good in Ka and W band operations characteristic, directional diagram E faces and H faces wave beam etc. are changed good
Good, two-band index meets reflecting surface job requirement.
Above said content is Dual-band dual-polarization feed of the present invention, however it is not limited to the present invention, is not departing from this
On the premise of inventive concept, some simple deductions can also be done with replacing, claims of the present invention is all contained in and is determined
Invention protection domain within.
Claims (8)
1. dual-band and dual-polarization millimeter wave feed, it is characterised in that：It is orthogonal by spoke side, Ka frequency ranges orthomode coupler and W frequency ranges
Mode coupler is constituted；
The spoke side is by the horn body that is sequentially connected（1）With Ka frequency range waveguides（2）Constitute, be both Ka frequency ranges spoke side and
The spoke side of W frequency ranges；
The Ka frequency ranges orthomode coupler is by W frequency ranges multimode horn, the feed waveguide of Ka frequency ranges first（5）Presented with Ka frequency ranges second
Electric waveguide（6）Constitute；The W frequency ranges multimode horn is by the Ka frequency range waveguides that are sequentially connected（2）, the transition frustum of a cone（4）With W frequency ranges
Waveguide（3）Constitute；The feed waveguide of Ka frequency ranges first（5）With the feed waveguide of Ka frequency ranges second（6）Respectively staggeredly located at Ka frequencies
Section waveguide（2）On, the feed waveguide of Ka frequency ranges first（5）With the feed waveguide of Ka frequency ranges second（6）It is mutually perpendicular to；And Ka frequency ranges
One feed waveguide（5）The port of export and the feed waveguide of Ka frequency ranges second（6）The port of export be equipped with wave filter（11）；
The W frequency ranges orthomode coupler is by W frequency range waveguides（3）, the feed waveguide of W frequency ranges first（7）Ripple is fed with W frequency ranges second
Lead（8）Constitute；The feed waveguide of W frequency ranges first（7）With the feed waveguide of W frequency ranges second（8）Staggeredly it is located at W frequency range waveguides（3）
On, the feed waveguide of W frequency ranges first（7）With the feed waveguide of W frequency ranges second（8）It is mutually perpendicular to；
The Ka frequency ranges waveguide（2）With W frequency range waveguides（3）It is circular waveguide, and W frequency range waveguides（3）Diameter be less than Ka frequency ranges
Waveguide（2）；
The horn body（1）The Ka frequency range waveguides that are connected to of small-caliber end（2）One end, Ka frequency range waveguides（2）The other end
Pass through the transition frustum of a cone（4）It is connected to W frequency range waveguides（3）One end, W frequency range waveguides（3）The other end be bottom, and closing；W
Frequency range waveguide（3）For the feed waveguide of W frequency range multimode horns, Ka frequency range waveguides（2）For the transmission waveguide of W frequency range multimode horns.
2. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The horn body（1）To erect ripple
Line conical horn, it is laid with more than two wave grooves substantially symmetrical about its central axis along horn body, the groove depth of the wave groove in vivo
Not less than the wavelength of a quarter Ka frequency ranges, groove width is 1st/1/3rd~bis- of groove cycle.
3. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The W frequency ranges waveguide（3）It is straight
Footpath is Ka frequency range waveguides（2）Diameter 1/1/3rd~bis-.
4. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The transition frustum of a cone（4）'s
Taper is 25~35 degree.
5. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The wave filter（11）For Ka frequencies
Section passband and the low pass filter with W frequency range stopbands.
6. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The Ka frequency ranges first feed ripple
Lead（5）, the feed waveguide of Ka frequency ranges second（6）, the feed waveguide of W frequency ranges first（7）With the feed waveguide of W frequency ranges second（8）Difference position
In the four direction on the basis of the axial direction of the millimeter wave feed.
7. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The Ka frequency ranges first feed ripple
Lead（5）, the feed waveguide of Ka frequency ranges second（6）Waveguide end face by 90 ° of corner cut elbow rectangular waveguides be transformed to diameter parallel in
Ka frequency range waveguides（2）Rectangular waveguide.
8. dual-band and dual-polarization millimeter wave feed according to claim 1, it is characterised in that：The W frequency ranges first feed ripple
Lead（7）With the feed waveguide of W frequency ranges second（8）Waveguide end face with Ka frequency range waveguides（3）Rectangular waveguide axis it is vertical.
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| CN112421226B (en) * | 2020-11-11 | 2022-10-21 | 中国电子科技集团公司第二十九研究所 | Dual-frequency dual-polarization high-power antenna |
| CN115064856B (en) * | 2022-05-12 | 2023-07-07 | 中国电子科技集团公司第五十四研究所 | W-band self-tracking mode coupler |
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