CN110768017B - SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source and application thereof - Google Patents
SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source and application thereof Download PDFInfo
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- CN110768017B CN110768017B CN201910999029.8A CN201910999029A CN110768017B CN 110768017 B CN110768017 B CN 110768017B CN 201910999029 A CN201910999029 A CN 201910999029A CN 110768017 B CN110768017 B CN 110768017B
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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
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- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
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Abstract
An SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source comprises a conical horn, four-ridge circular waveguides, a straight waveguide, a horn outer wall, ridge pieces, a first coaxial probe, a second coaxial probe and a short-circuit reflection cavity; one end of the four-ridge circular waveguide is connected with the conical horn, and the other end of the four-ridge circular waveguide is connected with the short circuit back cavity; the four ridge pieces are in a curve concave shape and are respectively embedded in the conical horn and the four ridge circular waveguides; the first coaxial probe and the second coaxial probe are respectively inserted from a ridge piece, penetrate through the centers of the four ridge circular waveguides and then reach the ridge piece at the opposite position; the first coaxial probe and the second coaxial probe are divided into five matching sections in a cascade mode by adopting a plurality of matching blocks, and the return loss is reduced by adjusting the length and the width of each section; the outer wall of the horn is loaded on the outer sides of the conical horn and the four-ridge circular waveguide; the short circuit reflection cavity is positioned in the straight waveguide and comprises an L-shaped matching block and a cutting inverted cone frustum; the working frequency band of the feed source is 2.4-24GHz, and a refrigeration Dewar matched with the feed source is developed.
Description
Technical Field
The invention belongs to the technical field of radio astronomical receivers, and particularly relates to an SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source. The invention also relates to an astronomical application of the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source refrigeration Dewar.
Background
The Square Kilometer Array (SKA) antenna requires wide frequency band work, the existing multi-octave reflector antenna feed source mainly comprises a four-ridge horn feed source, a Sinuous feed source and an Eleven feed source, and the four-ridge horn feed source realizes the wide frequency band work by utilizing the characteristic of lower cut-off wavelength of ridge waveguide.
However, the current four-ridge horn feed source has some defects in application, such as: the feed structure of the Sinuous feed source is complex, the feed source has the bidirectional radiation characteristic, and the feed source efficiency is relatively low; the phase center of the Eleven feed source is constant, the directional diagram does not change greatly along with the frequency, the radiation mechanism is a vibrator and a reflecting plate, the feed mode is difficult to realize, and the insertion loss is large; the working is not perfect at home and abroad in the integrated development of the 2.4-24GHz feed source Dewar, and aiming at the requirements of SKA on large scale and ultra wide band, the currently executed development work of the broadband single-beam feed source of the advanced instrument project is the development work of two feed sources of a BandA low-frequency band 1.6-5.2GHz and a BanDB high-frequency band 4.6-24GHz, one feed source cannot realize the coverage of the wide frequency band, and the feed source needs to be frequently replaced in practical application.
The prior patent application CN201620282081.3 describes a four-ridge horn broadband feed antenna, which meets the low-frequency Band requirement of a reflecting surface array antenna Band 3(1.65-3.05GHz) in the SKA1 stage of SKA radio astronomical telescope, and realizes the antenna performance that the reflection loss is less than 10dB in the full frequency Band, the port isolation is less than 20dB in the whole frequency Band, and the beam width changes little in the E, H and 45-10 dB three planes. The feed source selection which provides possibility for the SKA radio astronomical telescope SKA1-MidArrayBand 3 is developed. But the antenna can not meet the requirement of broadband feed sources with frequency multiplication of 10 (2.4-24GHz) or more (including low frequency and high frequency) for the refrigeration of advanced instrument projects in the SKA2 stage.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the following technical scheme:
an SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source comprises a conical horn, four-ridge circular waveguides, a straight waveguide, a horn outer wall, ridge pieces, a first coaxial probe, a second coaxial probe and a short-circuit reflection cavity;
one end of the four-ridge circular waveguide is connected with the conical horn, and the other end of the four-ridge circular waveguide is connected with the short-circuit reflection cavity;
the four ridge pieces are in a curve concave shape and are respectively embedded in the conical horn and the four ridge circular waveguides;
the first coaxial probe and the second coaxial probe are respectively inserted from a ridge sheet, penetrate through the centers of the four ridge circular waveguides and then reach the ridge sheet at the opposite position; the first coaxial probe and the second coaxial probe are divided into five matching sections in a cascade mode by adopting a plurality of matching blocks, and the return loss is reduced by adjusting the length and the width of each section;
the outer wall of the horn is loaded on the outer sides of the conical horn and the four-ridge circular waveguide;
the short circuit reflection cavity is positioned in the straight waveguide and comprises an L-shaped matching block and a cut inverted cone frustum, and the short circuit reflection cavity is a cylinder;
the working frequency band of the feed source is 2.4-24 GHz.
Wherein, the overall dimension of the feed source shape is phi 170mm multiplied by 187 mm.
Wherein, the conical horn aperture is 170mm, and the horn section length is 142 mm.
The first coaxial probe and the second coaxial probe are in a cascade connection mode of a plurality of matching blocks, the inner conductor of the coaxial probe comprises five matching sections, the five matching sections are sequentially 3.38mm, 0.3mm, 1.05mm, 0.6mm and 14.23mm long, the inner diameters of the second matching block and the fourth matching block are 1mm, and the inner diameters of the rest matching blocks are 0.8 mm.
Wherein, the aperture of the four-ridge circular waveguide is 49mm, and the length is 39 mm.
The short circuit reflection cavity is 31mm in caliber and 17mm high, the cut inverted cone frustum is 31mm in caliber of the upper bottom edge and 8mm in caliber of the lower bottom edge and 11.3mm high, the L-shaped matching block is 48mm in total length and 3mm in thickness.
The invention also relates to a refrigerating Dewar comprising a vacuum window, a Dewar cavity, a radiation cover, a feed source and a support structure thereof, wherein the radiation cover is in a cylindrical shape with two open ends and is arranged in the Dewar cavity, the feed source is positioned in the radiation cover and is supported by the four support structures, the vacuum window is arranged at the top of the Dewar cavity, and the feed source adopts the SKA ultra wide band refrigerating miniaturized four-ridge horn feed source.
The technical scheme of the invention has the following technical effects:
according to the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source, the curve inside the four ridges is designed in a concave mode, the distribution rule of the mouth surface field is improved through curve expansion, the directional diagram is improved, and the phase center is more concentrated; the first coaxial probe and the second coaxial probe adopt a mode of cascading a plurality of matching blocks, the inner conductor is divided into five matching sections which are 3.38mm, 0.3mm, 1.05mm, 0.6mm and 14.23mm long respectively, the standing wave discontinuity of a certain point is eliminated, the 50 ohm impedance matching of the four-ridge horn is realized, and the broadband characteristic is further realized; by adding the trapezoidal short circuit board in the reflection cavity, the antenna can be well matched, and better standing wave characteristics can be obtained.
The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source disclosed by the invention can realize the horn feed source of the working frequency band of the SKA ultra-wideband above 10 octaves, the horn feed source works in the 2.4-24GHz bandwidth, the standing wave is lower than-10 dB, the isolation degree is less than-25 dB, the directional diagram has good isocratic property, the actual measurement result is basically consistent with the simulation result, the feed source reaches the physical temperature below 50K after refrigeration, the noise temperature is less than 1K, the caliber size is only 170mm, the size of a vacuum window is reduced, the heat loss is reduced, and the weight of an SKA receiver is reduced; the small-sized low-noise refrigeration receiver with good compactness and small longitudinal size improves the sensitivity of the telescope, thereby opening up an important way for detecting darker and weaker radio sources. The capability of rapid search and accurate detection of pulsar can be effectively improved; the flexibility of the observation equipment in frequency selection is improved; the number of receivers used is reduced; the engineering construction and the future operation and maintenance difficulty are reduced; the antenna can be applied to SKA reflecting surface antennas with wide distribution and large quantity.
The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source developed by the invention works at 2.4-24GHz, covers the requirement of the whole high frequency band, simultaneously considers the requirement of part of low frequency bands, almost realizes the possibility that one feed source replaces two feed sources, can replace a plurality of relatively narrow-band receivers in the current SKA1 design stage, improves the efficiency and capacity of receiving signals, reduces the number of the receivers, and reduces the difficulty of engineering construction and future operation and maintenance.
Drawings
FIG. 1 is a schematic view of a feed source structure of a miniaturized four-ridge horn for ultra-wideband refrigeration according to the present invention;
FIG. 2 is a cross-sectional view of a short circuited reflective cavity;
FIG. 3 is a top view of four spine pieces;
FIG. 4 is a side view of a spine panel;
FIG. 5 is a schematic view of the inner conductor of the coaxial probe;
FIG. 6 is a bottom view of a four-ridge circular waveguide section;
FIG. 7 is a comparison graph of SKA ultra wide band refrigeration miniaturized four-ridge horn feed source simulation and test reflection loss according to the present invention;
FIG. 8 is a comparison graph of SKA ultra wide band refrigeration miniaturized four-ridge horn feed source simulation and test isolation according to the present invention;
FIG. 9 is a main polarization pattern of an SKA ultra wide band refrigeration miniaturized four-ridge horn feed source in the plane of 4GHz E and H, D;
FIG. 10 shows the main polarization pattern of the SKA ultra-wideband refrigeration miniaturized quad-ridged horn feed source in the plane of 14GHz E and H, D;
FIG. 11 is a main polarization pattern of an SKA ultra wide band refrigeration miniaturized quad-ridged horn feed source in the plane of 24GHz E and H, D;
FIG. 12 is a cross polarization directional diagram of a SKA ultra wide band refrigeration miniaturized four-ridge horn feed source in a D plane according to the present invention;
FIG. 13 is a graph of the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source gain simulation and test comparison results of the present invention;
FIG. 14 is a schematic structural view of an SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source refrigeration Dewar of the present invention;
fig. 15 shows the calculation and analysis of the insertion loss of the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source.
The device comprises a 1-conical horn, a 2-four-ridge circular waveguide, a 3-straight waveguide, a 4-horn outer wall, a 5-ridge sheet, a 6-first coaxial probe, a 7-second coaxial probe, an 8-short circuit reflection cavity, a 9-L-shaped matching block, a 10-cutting inverted cone frustum, an 11-Dewar cavity, a 12-radiation cover, a 13-feed source, a 14-vacuum window and a 15-supporting structure.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source has a working frequency band of 2.4-24GHz, and comprises a conical horn 1, a four-ridge circular waveguide 2, a straight waveguide 3, a horn outer wall 4, a ridge sheet 5, a first coaxial probe 6, a second coaxial probe 7 and a short-circuit reflection cavity 8.
One end of the four-ridge circular waveguide 2 is connected with the conical horn 1, and the other end of the four-ridge circular waveguide is connected with the short-circuit reflection cavity 8. The radiation characteristic of the dual-polarized horn antenna is determined by the horn aperture of the conical horn 1 and the length of the horn section, the horn section mainly comprises a horn outer wall 4 and four orthogonal ridge pieces 5, and the horn outer wall 4 is loaded on the outer sides of the conical horn 1 and the four ridge circular waveguide 2.
The ridge structure is used as a guide, so that electromagnetic energy in the ridge waveguide is gathered in the middle area of the ridge 5 and transmitted to the bell-mouth surface. The characteristic impedance of the feed port of the ridge waveguide is 50 omega, the characteristic impedance of the bell-mouth surface (namely the characteristic impedance of free space) is 377 omega, and the ridge structure usually adopts an exponential gradient form to enable the impedance to smoothly transit in the transformation process. The curve in the four ridge pieces is designed to be concave, the distribution rule of the oral surface field is improved through curve expansion, and the directional diagram is improved, so that the phase center is more concentrated.
From the feed point to the small mouth face of the conical horn is a four-ridge circular waveguide 2 which is mainly used for reducing the cutoff frequency of a main mode of a transmission signal. The four ridge pieces 5 are in a curve concave shape and are respectively embedded in the conical horn 1 and the four ridge circular waveguides 2;
the first coaxial probe 6 and the second coaxial probe 7 have an inner diameter of 0.8mm, an outer diameter of 1.85mm and a distance of 1.1 mm. The four-ridge circular waveguide is fed by using a coaxial connector with characteristic impedance of 50 omega, and meanwhile, the outer conductor of the coaxial connector is required to be well contacted with the four-ridge circular waveguide 2, an air cavity which can enable a probe to pass through is opened in two adjacent ridge sheets 5 which are perpendicular to each other, then each coaxial probe is inserted into one ridge sheet 5 and is stopped after passing through the center of the four-ridge circular waveguide 2 until reaching the ridge sheet at the opposite position, and a unipolar radiator is formed inside the four-ridge circular waveguide 2, so that impedance matching between the coaxial connector and the four-ridge circular waveguide 2 is facilitated. The feed source is fed by a first coaxial probe 6 and a second coaxial probe 7 which are orthogonal to each other and are arranged in a staggered mode, and orthogonal polarized waves which are perpendicular to each other are excited in the four-ridge circular waveguide 2. The first coaxial probe 6 and the second coaxial probe 7 are segmented into five matching sections in a cascade mode by adopting a plurality of matching blocks, and return loss is reduced by adjusting the length and the width of each section. The inner conductor of the coaxial probe comprises five matching sections, wherein the five matching sections are sequentially 3.38mm, 0.3mm, 1.05mm, 0.6mm and 14.23mm long, the inner diameters of the second matching block and the fourth matching block are 1mm, and the inner diameters of the other matching blocks are 0.8 mm. The edges of the ridge pieces 5 are chamfered by 45 degrees, so that a smaller ridge piece distance can be obtained under the condition of ensuring the thickness of the ridge pieces, and orthogonal assembly of the four ridge pieces 5 is realized.
Referring to fig. 2, the short-circuit reflective cavity 8 is located in the straight waveguide 3 and includes an L-shaped matching block 9 and a cut inverted truncated cone 10, and the short-circuit reflective cavity 8 is a cylinder. And for the straight waveguide section, the L-shaped matching block is added in the conical reflecting cavity to realize the stepped matching cavity to improve the antenna matching, so that better standing wave characteristics are obtained. In order to facilitate installation and achieve good contact when a real object is processed, the sectional area of the reflecting cavity is designed to be smaller than that of the four-ridge circular waveguide 2, so that the whole reflecting cavity can be directly embedded into the ridge waveguide section, and impedance matching can be adjusted through the embedded depth.
The overall size of the feed source can be properly adjusted according to the frequency requirement, in the embodiment, the overall size is phi 170mm multiplied by 187mm, the diameter of the cone horn is 1mm, the length of the horn section is 142mm, the diameter of the four-ridge circular waveguide is 2mm, the length is 39mm, the diameter of the short circuit reflection cavity is 8mm, the height is 17mm, the diameter of the upper bottom edge of the cutting inverted cone frustum 10 is 31mm, the diameter of the lower bottom edge of the cutting inverted cone frustum is 8mm, the height is 11.3mm, the total length of the L-shaped matching block 9 is 48mm, the thickness is 3mm, the length of the bottom frustum part is 6.97mm, the height is 10mm, and the working. The feed source main body is made of metal, and the metal is selected from metal alloy (aluminum alloy 8050) of aluminum, silicon, iron, copper, manganese, magnesium, chromium and zinc
The horn antenna is a bore antenna formed by gradually opening a waveguide terminal, has wide frequency band, high gain and good directivity, and is often used as an independent antenna or a feed source. However, the frequency range of main mode transmission of the horn antenna is limited by the size of the waveguide, and in order to widen the frequency band, a ridge-shaped structure is added to the waveguide portion and the flared portion of the horn, and the ridge-shaped waveguide is used to reduce the cutoff frequency of the main mode, so that the frequency band of single mode operation is widened before the occurrence of the higher-order mode.
Compared with the waveguide radiator, the horn antenna has the advantages that the opening surface is gradually enlarged, so that the matching of free space is improved, the directivity is improved, and the gain is improved. However, the horn antenna is formed by gradually opening an open waveguide, and the frequency range of main mode transmission of the horn antenna is limited by the size of the waveguide in both a rectangular waveguide and a circular waveguide. For the single-mode transmission of the rectangular waveguide main mode TE10 with the broadside dimension a, the operating wavelength must satisfy the following conditions: a < λ <2 a; the condition for single mode TE11 transmission for a circular waveguide (radius R) is 2.62R < λ < 3.41R. From this, it can be seen that the upper and lower limit frequencies f (u)/f (l) < 2. In order to realize broadband work, the invention adopts a ridge adding method, the ridges have equal spacing in ridge waveguide sections and are opened in a gradual exponential mode in a horn section, so as to realize the characteristics of cut-off wavelength, low equivalent impedance and wide working frequency band.
Referring to fig. 3 and 4, the ridge piece 5 has a thickness of 3mm, a ridge distance of 1.35mm, a width of the front end of the bottom of the ridge piece 5 of 0.52mm, and a cutting angle of 45 °.
In terms of standing waves, the standing wave performance of a horn antenna is related to the reflection of the three parts of the input section, the transmission section and the horn mouth of the horn. In order to obtain good matching, a matching element can be added on the input section or the mouth of the horn, and good standing wave performance can be obtained by a test method. The first coaxial probe 6 and the second coaxial probe 7 adopt a mode of cascading a plurality of matching blocks, the inner conductor is divided into five cylindrical matching sections, for example, the five cylindrical matching sections can be sequentially 3.38mm long and 0.8mm in diameter, 0.3mm long and 1mm in diameter, 1.05mm long and 0.8mm in diameter, 0.6mm long and 1mm in diameter, 14.23mm long and 1mm in diameter (the structure diagram of the inner conductor of the coaxial probe is shown in fig. 5), and the five matching sections are connected step by step. The ridgeline of the four-ridged horn antenna mainly transforms the impedance from 50 of the feed point to 377 of the free space impedance of the horn mouth and ensures smooth transformation of the impedance in the whole horn, thereby ensuring better impedance matching characteristic.
The waveguide is often used as a device for transmitting electromagnetic wave energy, and a ridge structure is added in the waveguide, so that the cut-off frequency of main mode transmission can be reduced, and the working area of the low frequency band of the horn can be widened. Due to the effect of the edge capacitance of the ridge waveguide, the cutoff frequency of the primary mode is lower than that of the waveguide without the ridge, and the cutoff frequency of the secondary mode is higher than that of the waveguide without the ridge, so that the working bandwidth of the ridge waveguide is widened. The front end face of the ridge waveguide section is designed to be trapezoidal, so that the distance between the four ridge pieces is reduced on the premise of ensuring the thickness of the ridge pieces, and the purpose of improving matching is achieved. The bottom view of the four-ridge circular waveguide section is shown in fig. 6.
The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source is tested, the reflection loss of an S parameter simulation test result (see figure 7) reaches below-10 dB, better isolation is realized in a full frequency band (see figure 8), the test result can be smaller than-25 dB, the test result of an E, H, D face main polarization far-field directional diagram test is better in low, medium and high frequency equality (see figures 9-11), full frequency band D-face cross polarization is below-25 dB (see figure 12), gain is between 11 and 21dB (see figure 13), the caliber size is only 170mm, the size of a vacuum window can be reduced, and further heat loss is reduced.
The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source is developed and tested by a refrigeration Dewar, and referring to fig. 14, the refrigeration Dewar mainly comprises the following structures: a vacuum window 14, a dewar cavity 11, a radiation shield 12 (to reduce radiant heat), a feed 13 and its support structure 15. The support structure 15 may be made, for example, from G10 (a glass fiber and resin laminated composite material, "G" for glass fibers, "10" for glass fibers having 10% glass fibers therein). The radiation cover 12 is a cylinder with two open ends and is arranged in the Dewar cavity 11, the feed source 13 is surrounded by the cavity of the radiation cover 12, the radiation cover 12 comprises 4G 10 supporting structures 15 to support the feed source 13, and the top of the Dewar cavity 11 is provided with a vacuum window 14. The feed source 13 adopts the SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source.
And (3) experimental environment construction:
a dewar body (providing a vacuum sealed environment);
temperature monitor and temperature sensor (for measuring temperature)
Composite vacuum gauge, vacuum pump, vacuum pipe (for testing Dewar internal vacuum degree)
Compressor and cold head and helium pipeline (for refrigeration)
The equipment model is as follows:
cold head KDE210SA
Air-cooled helium compressor M600
Composite vacuum gauge ZDF-III-LED
Eight-channel M9308 American SI multi-channel detector
The test result shows that after 24 hours of refrigeration, the temperature of the feed source is reduced to less than 50K and is kept to about 45K, the final vacuum degree is 4.1E-5 Pa, and the physical temperature Tphy of the feed source level is 45K.
The insertion loss calculated in the CST electromagnetic simulation software as shown in FIG. 15 is 0.04-0.4dB @2.4-24 GHz.
And (3) calculating the noise contribution of the four-ridge horn feed source:
[10^ (0.004) -1 ]. gtoreq.45 ^ 0.42K to [10^ (0.008) -1 ]. gtoreq.45 ^ 0.83K @ most bands
[10^(0.03)-1]*45＝3.2K～[10^(0.04)-1]*45＝4.3K@4GHz、5GHz、24GHz。
Thus, the four-ridged horn feed introduces noise temperatures that achieve less than 1K in most frequency bands.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present system has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present system.
Claims (7)
1. An SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source is characterized by comprising a conical horn (1), four-ridge circular waveguides (2), a straight waveguide (3), a horn outer wall (4), ridge pieces (5), a first coaxial probe (6), a second coaxial probe (7) and a short-circuit reflection cavity (8);
one end of the four-ridge circular waveguide (2) is connected with the conical horn (1), and the other end of the four-ridge circular waveguide is connected with the short-circuit reflection cavity (8);
the four ridge pieces (5) are in a curve concave shape and are respectively embedded into the conical horn (1) and the four ridge circular waveguide (2);
the first coaxial probe (6) and the second coaxial probe (7) are respectively inserted from a ridge piece, penetrate through the centers of the four-ridge circular waveguides (2) and then reach the ridge piece at the opposite position; the first coaxial probe (6) and the second coaxial probe (7) are divided into five matching sections in a cascade mode by adopting a plurality of matching blocks, and the return loss is reduced by adjusting the length and the width of each section;
the horn outer wall (4) is loaded on the outer sides of the conical horn (1) and the four-ridge circular waveguide (2);
the short circuit reflection cavity (8) is positioned in the straight waveguide (3) and comprises an L-shaped matching block (9) and a cutting inverted cone frustum (10), and the short circuit reflection cavity (8) is a cylinder;
the working frequency band of the feed source is 2.4-24 GHz.
2. The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source is characterized in that the overall size of the feed source is phi 170mm x 187 mm.
3. The SKA ultra-wideband refrigeration miniaturized four-ridge horn feed source according to claim 1 is characterized in that the caliber of the conical horn (1) is 170mm, and the length of the horn section is 142 mm.
4. The SKA ultra wide band refrigeration miniaturization four-ridge horn feed source according to claim 1 is characterized in that a plurality of matching blocks are cascaded to the first coaxial probe (6) and the second coaxial probe (7), an inner conductor of the coaxial probe comprises five matching sections, the five matching sections are sequentially 3.38mm, 0.3mm, 1.05mm, 0.6mm and 14.23mm long, the inner diameters of the second matching block and the fourth matching block are 1mm, and the inner diameters of the other matching blocks are 0.8 mm.
5. The SKA ultra wide band refrigeration miniaturized four-ridge horn feed source is characterized in that the caliber of the four-ridge circular waveguide (2) is 49mm, and the length of the four-ridge circular waveguide is 39 mm.
6. The SKA ultra wide band refrigeration miniaturization four-ridge horn feed source according to claim 1 is characterized in that the short circuit reflection cavity (8) is 31mm in caliber and 17mm high, the cut inverted cone frustum (10) is 31mm in caliber at the upper bottom edge, 8mm in caliber at the lower bottom edge and 11.3mm high, the L-shaped matching block (9) is 48mm in total length and 3mm in thickness.
7. The utility model provides a refrigeration dewar, includes vacuum window (14), dewar cavity (11), radiation cover (12), feed source (13) and bearing structure (15), radiation cover (12) are both ends open-ended tube-shape, locate dewar cavity (11), feed source (13) are located radiation cover (12), and feed source (13) are supported by four bearing structure (15), and dewar cavity (11) top is located in vacuum window (14), its characterized in that, feed source (13) adopt the miniaturized four spine loudspeaker feed sources of SKA ultra wide band refrigeration of any of claims 1-6.
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| CN111555033B (en) * | 2020-04-30 | 2022-04-12 | 北京中测国宇科技有限公司 | Broadband ridge piece outward-detection four-ridge circular horn feed source antenna |
| CN112510374A (en) * | 2020-12-08 | 2021-03-16 | 南京长峰航天电子科技有限公司 | Dual-polarized conical horn antenna |
| CN113922090A (en) * | 2021-10-25 | 2022-01-11 | 中国电子科技集团公司第二十九研究所 | Ultra-wideband dual-polarized metal horn antenna |
| CN114361801B (en) * | 2021-12-28 | 2023-10-13 | 昆山荷兹天线微波技术有限公司 | Dual-polarized high-isolation L-band miniaturized horn antenna |
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| CN102683864A (en) * | 2012-05-14 | 2012-09-19 | 中国科学院国家天文台 | Four-ridge-type broad band feed source |
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| WO2017001856A1 (en) * | 2015-06-30 | 2017-01-05 | Global Invacom Ltd | Improvements to receiving and/or transmitting apparatus for satellite transmitted data |
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