CN102136634A - Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna - Google Patents

Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna Download PDF

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CN102136634A
CN102136634A CN2011100049461A CN201110004946A CN102136634A CN 102136634 A CN102136634 A CN 102136634A CN 2011100049461 A CN2011100049461 A CN 2011100049461A CN 201110004946 A CN201110004946 A CN 201110004946A CN 102136634 A CN102136634 A CN 102136634A
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feed
receiving
frequency range
antenna
waveguide
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CN102136634B (en
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杨仕文
滕静华
黄明
聂在平
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Abstract

The invention provides a Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna applied to antenna systems, such as a paraboloid antenna and the like, in satellite communication. The antenna adopts a coaxial nested compact structure, and is applied to Ku frequency band and Ka frequency band at the same time. The basic structure of a feed source comprises a circular waveguide, on which a pointed cone shaped dielectric rod is loaded, a flange, a coaxial waveguide, a symmetrical SMA connector pair, a circular polarizer and an orthogonal mode coupler, wherein the feed source in the Ka frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, the circularly polarization axial ratio in Ka double band is smaller than minus 2dB, and the transmitter-receiver isolation is smaller than minus 70dB; and the feed source in the Ku frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, a cross polarization level smaller than minus 40dB, and good transmitter-receiver isolation and reflection loss.

Description

The integrated transmitting-receiving feed antenna of a kind of Ku/Ka frequency range line circular polarization
Technical field
The invention belongs to the technical field of the design of feed in the radio communication, the Ku/Ka frequency range that it is particularly related to feed design in the satellite communication system is received and dispatched technology such as four frequency ranges, line circular polarization are integrated.
Background technology
Along with the development of satellite communication cause, existing C frequency range satellite resource can not satisfy growing satellite communication demand, and exploitation Ku, Ka wave band is imperative.The flourish of satellite communication cause proposed new requirement to its earth station antenna, for example high-gain, broadband or multiband, low-cross polarization, multi-beam, multipolarization or the like.
Feed is the heart of entire antenna system, and the high-performance feed is the most important condition of high performance antenna system.How to be operated in broadband or multiband simultaneously in Ku, the design of Ka frequency range, characteristic with low-cross polarization, high-isolation, and can realize the feed of transmitting-receiving dual polarization or multipolarization, better to satisfy of the requirement of other antenna systems such as Luneberg lens antenna, parabolic antenna to feed.
The Ku/Ka corrugated horn feed of high-efficiency compact can effectively utilize same radiation actinal surface, makes antenna can be operated in four different frequency ranges simultaneously, makes the utilance of antenna improve three times.When corrugated horn feed antenna feed, the signal of four kinds of different frequency ranges, four kinds of different polarization just can transmit simultaneously.Promptly within this four each and every one frequency range, antenna can send two kinds of signals simultaneously, receives two kinds of signals simultaneously, and we can solve the interference that produces between the signal by transmitting-receiving high-isolation and polarization separation.
People such as the Du Biao of No.54 Institute of China Electronics Science ﹠ Technology Group disclose the shared corrugated horn feed of a kind of dual-slot structure two-band in patent CN1438733, it changes changeover portion by harmful higher mode inhibitor, dual-slot structure wave groove mode converter, the dark ripple struction frequency change of double flute, angle and the dark ripple struction radiant section of double flute constitutes.Be suitable as the feed of shared satellite communications of two-band such as L/C, S/C, S/X and C/Ku and observing and controlling antenna.In patent CN1317884 poplar can loyalty etc. the people a kind of corrugated horn feed that improves the offset parabolic antenna cross polarization characteristics is disclosed, it is propagated and forms by the exciter that light wall circular waveguide, coupling cavity, coupling aperture constitute by the bimodulus corrugated horn with by higher mode.The satellite communication single-offset parabolic reflector antenna that is particularly suitable for the little F/D focal length/diameter of Ku frequency range is done feed source device.People such as the Wan Xiaomei of No.38 Inst., China Electronic Sci. ﹠ Tech. Group Co. are entitled as " double-circle polarization and difference beam broadband corrugation horn feed antenna " and disclose a kind of double-circle polarization and difference beam broadband corrugation horn feed antenna in patent CN101626113, its structure comprises antenna body and coaxial probe, antenna body is cylindric, its top is corrugated portion, and the bottom is the feed part.Can be used for the wideband dual polarized pulse feed of high band, in 60% frequency band range, can realize good circular polarization axial ratio.People such as the Tang Yimin of Electronic Inst No.29, Ministry of Information Industry disclose the orthogonal polarized feed source of a kind of broadband, high-power, high-isolation in patent No. CN1331502.Orthogonal polarized feed source is when satisfying broadband, high power capacity, and the isolation of main road, dypass has had the raising of matter, reaches more than the 42dB.More than domestic disclosed these patents about the feed aspect, their design generally all is a two-band, some satisfy high-power requirement, some satisfy the requirement broadband or high-isolation, realize the effective radiation characteristic of antenna system.And feed of the present invention works in Ku, Ka frequency range, can carry out the transmitting-receiving work of line circular polarization simultaneously, does not need a plurality of feeds just can cover four frequency ranges separately in antenna system, wave beam Jiao's problem partially when solving a plurality of feeds and placing.When Ku frequency range and Ka frequency range transmitting-receiving work, feed has excellent radiation characteristic and high isolation simultaneously.
U.S. specialty inventor Joseph A.Preiss is entitled as " Dual Band Feed with Integrated Mode Transducer " in publication numbers 6005528 to have set forth a kind of feed structure be that the intermediate medium bar loads, the periphery is next nested with the corrugated horn of axial groove, be implemented in the radiation characteristic of two frequency ranges, but because axially grooved to the having relatively high expectations of technology, processing cost is bigger.Stephen D.Tafgonski was at IEEE Transactions on Antennas and Propagation in 2006, October 2006, Vol.54, p.2862-2868, No.10 delivers " A Multiband Antenna for Satellite Communications on the Move ".Introduced a kind of feed of three frequency ranges, it is operated in 20.2-21.2GHz (K frequency range), 30-31GHz (Ka frequency range), 43.5-45.5GHz (Q frequency range).The advantage of this feed is to be operated in three frequency ranges and a plurality of polarization simultaneously, and guarantees higher bore efficient.United States Patent (USP) inventor Robert A.Frosch is entitled as in " Multifrequency Broadband Polarized Horn Antenna " in publication numbers 4258366 and has introduced a kind of feed that is operated in five frequency ranges, change all signals of horn mouth radiation by a ripple circular cone, signal is coupled out from public transmission waveguide by the orthogonal mode structure.Owing to there is the signal of a plurality of frequency ranges to transmit jointly, feed needs many band pass filters each Signal Separation at the output interface place, increase the isolation between the frequency band.It is relatively poor in the voltinism such as far-field pattern of each frequency range radiation.2009, Bhattacharyya, A. wait Symposium, delivered on 2009.APSURSI ' 09.IEEE to be entitled as in " Multiband Feed using coaxial configuration " and discussed a kind of scheme that adopts coaxial nested structure to realize being operated in S, Ku, K, Ka frequency range at Antennas and Propagation Society International.The circular waveguide of flare angle variation is propagated the electromagnetic wave signal of Ku, K, Ka frequency range in the middle of the feed, and the coaxial waveguide of ladder flare angle variation is propagated the signal of S frequency range.At the high band place, the multiple coupling between coaxial waveguide and the circular waveguide has very remarkable influence to the performance of feed.Mention the effective radiation that realizes three frequency ranges with a circular waveguide in the article, but do not mention the isolation between each band signal in the feeding network in the back.For we to carry out transmitting-receiving work when requiring be ungratified.
Compare with paper with the patent of invention of mentioning before, the integrated four frequency range feeds of line circular polarization of the coaxial nested structure that the present invention adopts have guaranteed the isolation between each adjacent band, can make feed in the Ku two-band, the Ka two-band is carried out transmitting-receiving work simultaneously, does not separate receiving and transmitting signal and do not need additionally to add filter.The far-field radiation directional diagram of feed is symmetry axially, and cross polarization is low, good line circular polarization performance and return loss.Traditional dragon uncle lens feed system is placed side by side with single Ku or Ka feed, its maximum beam position all can produce the skew of certain angle, can't realize receiving same satellite, this feed has well solved the burnt partially problem of wave beam, and it is specially adapted in the feed system of large-scale satellite communication antena such as parabolic antenna.
Summary of the invention
The transmitting-receiving line circle dual polarization that is used for large-scale antenna systems such as parabolic antenna in a kind of satellite communication, the feed of four frequency range high-efficiency compacts have been the object of the present invention is to provide, it works in the Ku/Ka wave band, have excellent performances such as rotational symmetric antenna pattern, extremely low cross polarization, good return loss and high isolation, and compact conformation, practical.
The line circular polarization four frequency range Ku/Ka feeds that this paper invented adopt coaxial nested configuration form, make the radiation actinal surface of Ku and Ka feed be implemented in isolation on the space.It by ring flange 1, cone-shaped dielectric rod 2, inner circular waveguide 3, Ku feed emission sub-miniature A connector to 4, the short circuit metal post 5 of symmetry, Ku feed receive orthogonal mode to 6, Ka feed receiving port 7, Ka feed emission port 8, coaxial waveguide 9, circular polarizer 10, ladder waveguide 11 form.Wherein, Ku feed emission sub-miniature A connector adopts 50 ohm of sub-miniature A connectors that often use in the microwave communication to 4, the Ku feed receives orthogonal mode to 6 external national standard rectangular waveguide BJ140, Ka feed receiving port 7 external BJ220, Ka feed emission port 8 external BJ320, the metallic reflection post 5 of symmetry is fixed in the middle of the coaxial waveguide 9 by welding or punching.
The Ku/Ka feed that this paper invented works in Ku, Ka wave band, and Ku feed emission sub-miniature A connector is used for transmit frequency band f to 4 T(bandwidth 5%), Ku feed receive orthogonal mode and are used to receive frequency range f to 6 R(bandwidth 5%). adjust the emission sub-miniature A connector to 4, receive orthogonal mode to 6, the short circuit metal post 5 of symmetry position and the emission sub-miniature A connector in coaxial waveguide 9 be deep into the degree of depth in the coaxial waveguide 9, circular waveguide 3 and coaxial waveguide 9 in the relative position of radiation actinal surface and coaxial waveguide 9 ladder waveguide 11 sizes at feed radiation actinal surface to 4, Ku/Ka feed described herein has obtained good return loss and receive-transmit isolation.Wherein, Dui Cheng short circuit metal post 5 has played the effect that reduces feed length and improve receive-transmit isolation.
Cone-shaped dielectric rod 2 is with the main mould TE that propagates in the inner circular waveguide 3 11Mould is adjusted into HE 11Mould, HE 11Mould can obtain rotational symmetric antenna pattern.For guaranteeing not encouraged except that HE 11Other patterns beyond the mould, the inside radius r of circular waveguide 4 and the relative dielectric constant ε of cone-shaped dielectric rod 1 rAnd operation wavelength λ need satisfy following formula:
2 * r < 1.22 &epsiv; r - 1 &lambda;
In the Ka feed, circular polarizer 10 is to realize the critical component that polarization changes in the circular polarized antenna system.Main mould TE in the circular waveguide 11Mould through circular polarizer be decomposed into later on the two-way quadrature, amplitude equates, the main mould signal that phase difference is 90 °, thus constituted the signal transmission of circular polarization, the circular waveguide that loads through dielectric rod radiate, and has obtained the radiation signal of circular polarization.Orthomode coupler belongs to two-band arrowband orthomode coupler, and it enters the signal in two frequency ranges in the same waveguide by orthomode coupler transmits.As shown in Figure 3, transmit, change circularly polarized signal into through the two-band circular polarizer again, have double frequency radiation port surface radiation to go out then via in the two-band orthomode coupler feed-in waveguide; The circularly polarized signal that is received by double frequency radiation actinal surface becomes the linear polarization signal through the double frequency round polarized device, is coupled away by the standard waveguide mouth by the two-band orthomode coupler again.The system block diagram of two-band circular polarization Ka feed as shown in figure 11.
Ku two-band linear polarization feed (as shown in Figure 2) is launched the signal of perpendicular polarization in coaxial waveguide, receive the signal of horizontal polarization.Wherein the emission port of Ku feed adopts the probe of the anti-phase symmetry of constant amplitude to encouraging.Suppress the main mould (TEM mould) in the coaxial waveguide in this way, and farthest encourage the first higher mode (TE in the coaxial waveguide 11Mould); The receiving port of Ku feed adopt constant amplitude with symmetrical orthogonal mode to encouraging.According to the mode profile in the electric field as can be known, this mode can be used for suppressing TEM mould in the coaxial waveguide equally, has encouraged TE to greatest extent 11Mould.
The present invention has following beneficial effect:
(1). compare with three frequency range feeds with two-band feed commonly used, structure of the present invention is compact efficient more, and the electromagnetic wave signals of receiving and dispatching certain bandwidth, four frequency ranges of four kinds of different polarization simultaneously are integrated in the middle of the same feed.
(2). in the Ku, Ka frequency range of transmitting-receiving, feed of the present invention has characteristics such as rotational symmetric antenna pattern, good receive-transmit isolation, good return loss and low-cross polarization.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Wherein, the 1st, ring flange, the 2nd, cone-shaped dielectric rod, the 3rd, the inner circular waveguide, the 4th, Ku feed emission sub-miniature A connector to, the 6th, the Ku feed receive orthogonal mode to, the 7th, Ka feed receiving port, the 8th, Ka feed emission port
Fig. 2, Fig. 3 are perspective structure schematic diagrames of the present invention;
Wherein, the 1st, ring flange, the 2nd, cone-shaped dielectric rod, the 3rd, the inner circular waveguide, the 4th, Ku feed emission sub-miniature A connector to, the 5th, the short circuit metal post, the 6th of symmetry, Ku feed receive orthogonal mode to, the 7th, Ka feed receiving port, the 8th, Ka feed emission port, the 9th, coaxial waveguide, the 10th, circular polarizer, the 11st, ladder waveguide
Fig. 4 is return loss and the receive-transmit isolation that the Ku feed receives frequency range;
Fig. 5 is the return loss and the receive-transmit isolation of Ku feed transmit frequency band;
Fig. 6 is that the Ku feed receives frequency range the center main poleization and cross polarization directional diagram of (12.5GHz) E face, H face frequently;
Fig. 7 is the Ku feed transmit frequency band center main poleization and cross polarization directional diagram of (14.25GHz) E face, H face frequently;
Fig. 8 is that the Ka feed receives frequency range the center main poleization and cross polarization directional diagram of (20.5GHz) E face, H face frequently;
Fig. 9 is the Ka feed transmit frequency band center main poleization and cross polarization directional diagram of (30.3GHz) E face, H face frequently;
Figure 10 is the cutaway view of cone-shaped dielectric rod 2, inner circular waveguide 3;
Figure 11 is the system block diagram of two-band circular polarization Ka feed.
Embodiment
With reference to Fig. 1, the line circular polarization four frequency range Ku/Ka feeds that this paper invented by ring flange 1, cone-shaped dielectric rod 2, inner circular waveguide 3, Ku feed emission sub-miniature A connector to 4, the short circuit metal post 5 of symmetry, Ku feed receive orthogonal mode to 6, Ka feed receiving port 7, Ka feed emission port 8, coaxial waveguide 9, circular polarizer 10, ladder waveguide 11 form.Ku feed emission sub-miniature A connector adopts 50 ohm of sub-miniature A connectors that often use in the microwave communication to 4, can directly be connected with waveguide coaxial converter, and the back connects the power splitter of 180 ° of electric bridges; The short circuit metal post 5 of symmetry partly punches by waveguide outside coaxial and is fixed in the middle of the coaxial waveguide 9; Inner circular waveguide 3 in the middle of the feed fixes by the length that prolongs coaxial waveguide 9 short circuit wall back.
The present invention works in Ku, Ka wave band, and the emission sub-miniature A connector is used for transmit frequency band f to 4 T(bandwidth 5%) receives orthogonal mode and is used to receive frequency range f to 6 R(bandwidth 5%) adjust the emission sub-miniature A connector to 4, receive orthogonal mode to 6, the short circuit metal post 5 of symmetry in coaxial waveguide 9 the position and the emission sub-miniature A connector to 4 stretching into the degree of depth in the coaxial waveguide 9, receiving orthogonal mode to 6 physical dimension and the size of ladder waveguide 11 and the relative position of inner circular waveguide.Line circular polarization four frequency range Ku/Ka feeds described herein have all obtained good return loss and receive-transmit isolation in Ku, Ka transmitting-receiving frequency range.
Cone-shaped dielectric rod 2 is with the main mould TE that propagates in the inner circular waveguide 3 11Mould is adjusted into HE 11Mould, HE 11Mould can obtain rotational symmetric antenna pattern.For fear of the incentive mode that has encouraged other, must suitably select diameter of section to make them be operated in cut-off state during design, need avoid producing asymmetrical wave HE for general 12And EH 12The inside radius r of inner circular waveguide 3 and the relative dielectric constant ε of cone-shaped dielectric rod 2 rAnd operation wavelength λ need satisfy following formula:
2 * r < 1.22 &epsiv; r - 1 &lambda;
At first select proper dielectric constant ε rWith the radius r of inner circular waveguide 3, the material of cone-shaped dielectric rod 2 has been selected polytetrafluoroethylene commonly used in the inner circular waveguide 3 of feed of the present invention; Reasonably select the radius r of inner circular waveguide 3 then according to above-mentioned formula; By changing the size (see figure 10) of cone-shaped dielectric rod 2 in the inner circular waveguide, can obviously improve the circular polarization characteristics of Ka feed.At Ka feed transmit frequency band with receive in the bandwidth of frequency range 5%, its axial circular polarization axial ratio is all less than-2dB.Accept frequency range and transmit frequency band at Ka, the present invention all has rotational symmetric antenna pattern, good circular polarization characteristics.See Fig. 8, Fig. 9.Receiving port and emission port all are made of orthomode coupler in the Ka feed.Size reasonable in design and structure can reach good return loss and isolation.Wherein, in the transmit frequency band of Ka feed, return loss is less than-18dB; In the reception frequency range of Ka feed, return loss is less than-20dB; Receive-transmit isolation has reached excellent performance requirement less than-70dB.
That short circuit metal post 5 by symmetry is set in coaxial waveguide and Ku feed receive orthogonal mode is right, thereby has realized Ku feed high receive-transmit isolation in working band.Ku feed receive-transmit isolation such as Fig. 4, shown in Figure 5.From simulation result as can be known, at the receive-transmit isolation of Ku feed two-band all more than 50dB.The Ku feed from the emission sub-miniature A connector to 4 or receive orthogonal mode to the electromagnetic wave signal of 6 feed-ins coaxial waveguide, if, can produce very big reflection loss directly to the free space radiation.We add step conversion waveguide 11 in the design in the outer waveguide of coaxial waveguide, to reduce the reflection loss of coaxial waveguide to the radiation actinal surface, be beneficial to the Ku feed and regulate coupling in operating frequency range.By the reasonable optimizing size, the Ku feed in transmit frequency band and the return loss that receives frequency range all less than-10dB.See Fig. 4, Fig. 5.Simultaneously, the Ku feed is at transmit frequency band and receive frequency range and have rotational symmetric far-field radiation directional diagram, is lower than-the excellent performances such as cross polarization of 40dB.See Fig. 6, Fig. 7.
Therefore, the compact four frequency range feed performances of the line circular polarization integrated high-efficiency that provides of this patent fully satisfy the performance requirement of antenna systems such as Luneberg lens antenna, parabolic antenna to feed.
More than, provide description of the invention so that their easy to understand and utilization the present invention to those skilled in the art that.For those skilled in the art that, be conspicuous to the various changes of these embodiment, and need not performing creative labour.Therefore, the present invention not only is limited to scheme described here, but the scope consistent with described claim.

Claims (8)

1. the integrated transmitting-receiving feed antenna of Ku/Ka frequency range line circular polarization that is used for satellite communication comprises that based on the coaxial waveguide nested structure ring flange (1), cone-shaped dielectric rod (2), inner circular waveguide (3), Ku feed emission sub-miniature A connector receive orthogonal mode to (6), Ka feed receiving port (7), Ka feed emission port (8), coaxial waveguide (9), circular polarizer (10), ladder waveguide (11) to short circuit metal post (5), the Ku feed of (4), symmetry.Wherein, Ku feed emission sub-miniature A connector adopts 50 ohm of sub-miniature A connectors that often use in the microwave communication to (4), the Ku feed receives orthogonal mode to (6) external national standard rectangular waveguide BJ140, the external BJ220 of Ka feed receiving port (7), the external BJ320 of Ka feed receiving port (8), the metallic reflection post (5) of symmetry is fixed in the middle of the coaxial waveguide (9) by welding or punching.
2. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that described Ku feed emission sub-miniature A connector receives orthogonal mode to (4) and Ku feed and (6) are realized receiving and dispatching two-wire polarizes in coaxial waveguide.
3. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that the short circuit metal post (5) of described symmetry and Ku feed receive orthogonal mode (6) have been realized the high-isolation of feed in Ku frequency range transmitting-receiving work.
4. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization has been introduced ladder waveguide (11) between it is characterized in that in described ring flange (1) and the coaxial waveguide (9).
5. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that the selection of described ring flange (1) structure and size.
6. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that the selection of described cone-shaped dielectric rod (2) size and position.
7. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that the selection of described circular polarizer (10) structure, size and dielectric constant.
8. the integrated transmitting-receiving feed antenna of stating according to claim 1 of a kind of Ku/Ka frequency range line circular polarization is characterized in that the selection of described Ka feed receiving port (7) and Ka feed emission port (8) orthogonal mode structure and size.
CN201110004946.1A 2011-01-12 2011-01-12 Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna Expired - Fee Related CN102136634B (en)

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