CN113258250B - Compact feed array structure of reflector antenna - Google Patents
Compact feed array structure of reflector antenna Download PDFInfo
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- CN113258250B CN113258250B CN202110392369.1A CN202110392369A CN113258250B CN 113258250 B CN113258250 B CN 113258250B CN 202110392369 A CN202110392369 A CN 202110392369A CN 113258250 B CN113258250 B CN 113258250B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/064—Two dimensional planar arrays using horn or slot aerials
Abstract
The invention relates to the technical field of antenna structures, in particular to a compact feed array structure of a reflector antenna, which comprises a mounting plate, wherein a plurality of mounting holes are arranged on the mounting plate in rows and columns, a plurality of loudspeakers are arranged on one side of the mounting plate, the loudspeakers are in one-to-one correspondence and communicated with the mounting holes, the wide-mouth end of each loudspeaker is far away from the mounting plate, and the closing end of each loudspeaker is attached to the mounting plate and is concentric with the mounting hole; the other side of the mounting plate is provided with a plurality of orthogonal coupling pieces, the front ends of the orthogonal coupling pieces are connected with the mounting plate and are communicated with the mounting holes in a one-to-one correspondence mode, and the rear ends of the orthogonal coupling pieces are connected with coaxial waveguide sections. The invention optimizes and improves the connection position structure of the loudspeaker and the mounting plate, and simultaneously sets the connection structure at the other side of the mounting plate as an orthogonal coupling piece to be matched with the coaxial waveguide piece, thereby not only enhancing the stability and reliability of the integral connection, but also avoiding the interference of the connection structure and ensuring the stability of the transmission of electromagnetic signals, thereby improving the integral reliability of the feed source array.
Description
Technical Field
The invention relates to the technical field of antenna structures, in particular to a compact feed array structure of a reflector antenna.
Background
The reflector antenna using the horn antenna as the feed array unit has the remarkable advantages of wide working frequency band, large power capacity, high gain, stable phase center and the like, and is widely applied to the fields of communication, radar, electronic warfare and the like at present. In the existing literature, the research on the electromagnetic design of the feed array of the reflector antenna is very much, but the specific research and design on the structural form is very little, and the introduction of detailed and efficient structural design details and implementation methods is lacked.
At present, a relatively common horn feed array structure is shown in fig. 7 and 8, and includes an antenna unit, a mounting plate and other structures. When the feed array is installed, the single horn antenna units are assembled and molded, and then the horn units are installed and fixed on the installation plate through the installation flange on the horn by using screws to form the feed array. The feed array structure requires that the sizes of the large and small port parts of the unit horns have large differences, and when the large port parts of the unit horns are tightly arranged and assembled into the feed array, enough size space is arranged at the mounting flange to set the mounting positions of the screws. Under some circumstances, the size difference of the large and small port parts of the unit horns is small or the unit horns are particularly complex, if the structural form shown in fig. 1 is adopted, in order to reserve the installation position space of screws or avoid the interference between the unit horns, the array spacing of the unit horns can only be increased, after the spacing is increased, all the other units in the feed source array except the unit positioned at the focal point of the reflecting surface deviate from the focal point of the reflecting surface in a large range, the electromagnetic performance of the reflecting surface antenna is seriously deteriorated, and the conditions such as distortion of sub-beams, gain reduction, side lobe level increase and the like occur.
The existing reflector antenna horn feed array structure and the realization method require that the sizes of the large and small port parts of the unit horns have larger difference, and when the large port parts of the unit horns are arrayed without gaps and assembled into a feed array, the mounting flange can be ensured to have enough size space for arranging the mounting position of a screw. The structure and the realization method can not meet the requirement that certain unit horns with small size difference or particularly complex size of port parts form a gapless feed source array.
Therefore, the existing reflector antenna feed array structure has a part to be improved urgently, and the feed array structure should be optimized and improved to improve the electromagnetic performance of the feed array structure, so a more reasonable technical scheme needs to be provided, and the defects in the prior art are overcome.
Disclosure of Invention
In order to solve the defects of the prior art mentioned in the above, the invention provides a compact feed array structure of a reflector antenna, which is convenient to connect and install by improving the structure of antenna units, can connect adjacent antenna units to realize installation under a more compact structure, and simultaneously ensures the reliability of the electromagnetic performance of the antenna.
In order to achieve the purpose, the invention specifically adopts the technical scheme that:
a compact feed array structure of a reflector antenna comprises a mounting plate, wherein a plurality of mounting holes are arranged on the mounting plate in rows and columns, a plurality of loudspeakers are arranged on one side of the mounting plate, the loudspeakers correspond to the mounting holes one by one and are communicated with the mounting holes, the wide-mouth end of each loudspeaker is far away from the mounting plate, and the closing end of each loudspeaker is attached to the mounting plate and is concentric with the mounting holes; the other side of the mounting plate is provided with a plurality of orthogonal coupling pieces, the front ends of the orthogonal coupling pieces are connected with the mounting plate and communicated with the mounting holes in a one-to-one correspondence manner, and the rear ends of the orthogonal coupling pieces are connected with coaxial wave-guide pieces.
The compact feed source array structure optimizes and improves the mounting and connecting structure of the mounting plate, the horn and the orthogonal coupling piece, so that the mounting and connecting of the horn can be more convenient, the condition of mutual interference in mounting is avoided, and the electromagnetic performance of the feed source array is kept reliable.
Furthermore, the horn adopted by the invention can be a structure with large caliber difference or a structure with small caliber difference, and is not limited uniquely; specifically, optimization is performed here and one of the possible options is presented: the end of the horn is provided with a flange structure, the mounting plate is provided with a connecting structure corresponding to the flange structure, and the flange structure on the horn is correspondingly matched with the connecting structure and is fixedly connected through a fastener. When adopting such structure, through the laminating of flange structure on the mounting panel to carry out fastening connection through connection structure, fastener, can realize the connection installation of loudspeaker with very high precision, and guarantee the reliable and stable of installation.
Still further, in order to improve the location precision when installing to make two adjacent loudspeaker can provide certain tight holding power each other, consequently can set the flange structure of loudspeaker holding end to square or polygon, there is the binding face in the flange structure of two adjacent loudspeaker, can improve the stability of integral connection installation.
Furthermore, the connection structure of the horn receiving end and the mounting plate can influence the transmission of electromagnetic signals, and in order to improve the stability of signal transmission and reduce the attenuation of signal transmission, the structure of the horn receiving end is optimized and the following feasible options are provided: the closed end of the horn protrudes out of the connecting binding surface of the flange structure and the mounting plate, and extends into the mounting hole of the mounting plate; the front end of the orthogonal coupling piece comprises a structure extending into the mounting hole, and the front end of the orthogonal coupling piece is the same as the caliber of the receiving end of the horn in size and is aligned and attached.
Further, the connection manner of the orthogonal coupling member and the mounting plate adopted in the present invention can be configured in various structures, which are not limited specifically, and is optimized and one of the feasible options is shown here: the front end of the orthogonal coupling piece is provided with a flange structure and corresponds to the connecting structure, and the fastening piece penetrates through the flange structures on the horn and the orthogonal coupling piece and realizes connection and fastening. When the scheme is adopted, the flange structure of the orthogonal coupling part is the same as that of the loudspeaker, and one fastener continuously penetrates through the flange structure of the orthogonal coupling part, the mounting hole and the mounting structure of the loudspeaker, so that the connection relation of the three parts is very tight, and meanwhile, the scheme that the loudspeaker and the orthogonal coupling part are connected through the fastener is avoided, and the connection mode is simpler and more reliable.
Further, for more stable connection between the horn and the orthogonal coupling member, the structure of the mounting plate is optimized to improve the connection tightness between the horn and the orthogonal coupling member, and one of the feasible options is as follows: the two sides of the mounting plate are provided with recessed structures, the mounting holes are formed in the recessed structures, and the flange structures of the orthogonal coupling piece and the horn are arranged in the recessed structures. When adopting such scheme, can carry out the inlay card with the flange structure and fix, improve the stability of installation.
Further, the structure of the orthogonal coupling used in the present invention can be optimized, and one of the possible options is as follows: the orthogonal coupling piece comprises a main body, wherein two low-frequency orthogonal linearly-polarized waveguide output ports are arranged on the main body, the directions of the two low-frequency orthogonal linearly-polarized waveguide output ports are perpendicular to each other, and the lengths of the two orthogonal linearly-polarized waveguide output ports are different. When the scheme is adopted, the main body is in a straight pipe shape, one end of the main body is matched with the mounting plate and communicated with the loudspeaker, and the low-frequency orthogonal linear polarization waveguide output ports are arranged in the middle of the main body and are perpendicular to the main body; the two output ports have different lengths, so that interference can not occur when other components are installed and connected, and the installation structure is more stable and reliable.
Furthermore, the number of the speakers arranged in the invention is not unique, and the number can be set according to actual requirements, and the number is optimized and one of the feasible options is provided: the number of the horn and the number of the orthogonal coupling pieces are four, and two adjacent orthogonal coupling pieces rotate by 90 degrees on the axis. When the scheme is adopted, the loudspeakers and the orthogonal coupling pieces can be arranged in two rows and two columns; the adjacent two orthogonal coupling pieces have an angle difference, so that the adjacent two orthogonal coupling pieces can avoid installation interference.
Further, in order to improve the installation reliability of the coaxial waveguide and avoid installation interference, the present invention optimizes the structure of the coaxial waveguide and provides a feasible option as follows: the lengths of the coaxial wave-guide members are at least two, and the lengths of the adjacent coaxial wave-guide members are different. When the scheme is adopted, when other parts are connected and installed between the coaxial waveguide parts with different lengths, the mutual interference condition can not occur, and the coaxial waveguide parts can conduct electromagnetic signals more stably and reliably after being connected with the other parts.
Further, in order to further improve the installation reliability of the coaxial waveguides, the arrangement mode of two adjacent coaxial waveguides is optimized and improved, and the following feasible options can be specifically adopted: two adjacent coaxial wave-guide members rotate through 90 degrees on the axis.
Still further, the angular difference between two adjacent coaxial waveguides is 90 °, which can be achieved by various matching schemes, optimized here and one of the possible options: one of the coaxial waveguides is rotated 45 ° relative to the axis of the orthogonal coupling member to which it is connected, and the two coaxial waveguides adjacent to that coaxial waveguide are rotated 45 ° in opposite directions. With such a configuration, not only can the adjacent coaxial waveguides be formed with an angular difference to avoid a mounting error, but also the coaxial waveguides and the orthogonal coupling member can be formed with an angular difference to avoid a mounting error.
Compared with the prior art, the invention has the beneficial effects that:
the invention optimizes and improves the connection position structure of the loudspeaker and the mounting plate, and simultaneously sets the connection structure at the other side of the mounting plate as an orthogonal coupling piece to be matched with the coaxial waveguide piece, thereby not only enhancing the stability and reliability of the integral connection, but also avoiding the interference of the connection structure and ensuring the stability of the transmission of electromagnetic signals, thereby improving the integral reliability of the feed source array.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is an exploded view of a compact feed array structure (only one unit is shown).
Fig. 2 is a cross-sectional view of a compact horn feed array structure (two units are shown).
Fig. 3 is a schematic diagram (4 units in the figure) of the coaxial wave guide member of the compact horn feed array structure.
Fig. 4 is a schematic side view of a compact horn feed array configuration (4 elements in the figure).
Fig. 5 is a schematic overall structure diagram of a compact horn feed array structure.
Fig. 6 is an exploded schematic view of a quaternary compact horn feed array structure in an embodiment.
Fig. 7 is a schematic diagram of a horn layout structure of a conventional feed array structure.
Fig. 8 is a schematic side view of a conventional feed array structure.
In the above drawings, the meaning of each symbol is: 1. a horn; 2. a flange structure; 3. a boss structure; 4. mounting a plate; 5. mounting holes; 6. a recessed structure; 7. a fastener; 8. a main body; 9. an orthogonal linearly polarized waveguide output port; 10. a coaxial waveguide.
Detailed Description
The invention is further explained below with reference to the drawings and the specific embodiments.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
Examples
The feed array structure of the reflector antenna aims at the situation that the existing feed array structure of the reflector antenna is interfered in installation and is difficult to be installed in a compact structure in a non-interference mode, and the feed array structure is provided by the embodiment and can solve the problems in the prior art.
Specifically, the feed array structure adopted in this embodiment is a quaternary compact feed array structure, and the technical scheme is as follows:
as shown in fig. 1 to 6, a compact feed array structure of a reflector antenna comprises a mounting plate 4, wherein a plurality of mounting holes 5 are arranged on the mounting plate 4 in rows and columns, a plurality of speakers 1 are arranged on one side of the mounting plate 4, the speakers 1 are in one-to-one correspondence with and communicated with the mounting holes 5, the wide-mouth end of the speaker 1 is far away from the mounting plate 4, and the closing end of the speaker 1 is attached to the mounting plate 4 and is concentric with the mounting holes 5; the other side of the mounting plate 4 is provided with a plurality of orthogonal coupling pieces, the front ends of the orthogonal coupling pieces are connected with the mounting plate 4 and communicated with the mounting holes 5 in a one-to-one correspondence manner, and the rear ends of the orthogonal coupling pieces are connected with coaxial wave-guide pieces 10.
Above-mentioned compact feed array structure disclosed optimizes the improvement through the erection joint structure with mounting panel 4, loudspeaker 1, quadrature coupling spare, makes loudspeaker 1's erection joint can be more convenient, avoids appearing the condition of installation mutual interference to the electromagnetic properties who has kept the feed array is reliable.
Preferably, as shown in fig. 1, a horn 1, an orthogonal coupler and a coaxial waveguide 10 form a feed unit in this embodiment. The quaternary feed array structure comprises four feed units.
The horn 1 used in the present embodiment may have a structure with a large caliber difference or a structure with a small caliber difference, and is not limited to the above. In some embodiments, the horn 1 may have a tapered structure with a larger taper, or a tapered structure with a smaller taper. Specifically, the present embodiment is optimized and adopts one of the feasible options: as shown in fig. 1, 2 and 6, a flange structure 2 is provided at a receiving end of the horn 1, a connecting structure corresponding to the flange structure 2 is provided on the mounting plate 4, and the flange structure 2 on the horn 1 is correspondingly matched with the connecting structure and is connected and fixed by a fastener 7. When adopting such structure, through the laminating of flange structure 2 on mounting panel 4 to carry out fastening connection through connection structure, fastener 7, can realize loudspeaker 1's connection installation with very high precision, and guarantee the reliable and stable of installation.
In order to improve the location precision when installing to make two adjacent loudspeaker 1 can provide certain tight holding power of supporting each other, consequently can set the flange structure 2 of loudspeaker 1 holding end to square or polygon, there is the binding face in the flange structure 2 of two adjacent loudspeaker 1, can improve the stability of integral connection installation.
The connection structure of the receiving end of the horn 1 and the mounting plate 4 can influence the transmission of electromagnetic signals, and in order to improve the stability of signal transmission and reduce the attenuation of signal transmission, the structure of the receiving end of the horn 1 is optimized and the following feasible options are provided: as shown in fig. 1 and 6, the closed end of the horn 1 protrudes from the connecting joint surface of the flange structure 2 and the mounting plate 4, and the closed end of the horn 1 extends into the mounting hole 5 of the mounting plate 4; the front end of the orthogonal coupling piece comprises a structure extending into the mounting hole 5, and the front end of the orthogonal coupling piece is the same as the caliber of the receiving end of the horn 1 in size and is aligned and attached.
Preferably, as shown in fig. 1, in this embodiment, the closed end of the horn 1 is provided with a circular-ring-shaped boss structure 3, and when the closed end of the horn 1 extends into the mounting hole 5, the inner wall of the mounting hole 5 can be tightly attached, so that the stability of mounting fit is improved.
The connection manner of the orthogonal coupling member and the mounting plate 4 adopted in the present embodiment may be configured in various structures, and is not limited specifically, in some embodiments, structures such as a threaded connection, a snap connection, a slot connection, and the like may be adopted, and the present embodiment is optimized and adopts one of the feasible options: as shown in fig. 2 and 4, the front end of the orthogonal coupling member is provided with a flange structure 2 and corresponds to the connecting structure, and the fastening member 7 passes through the horn 1 and the flange structure 2 on the orthogonal coupling member and realizes connection and fastening. When the scheme is adopted, the flange structure 2 of the orthogonal coupling part is the same as the flange structure 2 of the loudspeaker 1, and the fastener 7 continuously penetrates through the flange structure 2 of the orthogonal coupling part, the mounting hole 5 and the mounting structure of the loudspeaker 1, so that the connection relationship of the three parts is very tight, and meanwhile, the scheme that the loudspeaker 1 and the orthogonal coupling part are connected through the fastener 7 respectively is avoided, and the connection mode is simpler and more reliable.
Preferably, the fastening member 7 may be a bolt.
For more stable connection between the horn 1 and the orthogonal coupling member, the structure of the mounting plate 4 is optimized in the present embodiment to improve the connection tightness between the horn 1 and the orthogonal coupling member, and the present embodiment adopts one of the feasible options: the two sides of mounting panel 4 all be provided with sunk structure 6, mounting hole 5 sets up in sunk structure 6, the flange structure 2 of quadrature coupling piece and loudspeaker 1 sets up in sunk structure 6. When adopting such scheme, can carry out the inlay card with flange structure 2 and fix, improve the stability of installation.
In some embodiments, a raised enclosure structure may also be provided on the mounting plate 4 for positioning and mounting the flange structure 2.
The structure of the orthogonal coupling element adopted in the embodiment can be optimized, and the embodiment adopts one feasible choice: the orthogonal coupling piece comprises a main body 8, wherein two low-frequency orthogonal linearly-polarized waveguide output ports 9 are arranged on the main body 8, the directions of the two low-frequency orthogonal linearly-polarized waveguide output ports 9 are perpendicular to each other, and the lengths of the two orthogonal linearly-polarized waveguide output ports 9 are different. When the scheme is adopted, the main body 8 is in a straight pipe shape, one end of the main body 8 is matched with the mounting plate 4 and communicated with the horn 1, and the low-frequency orthogonal linear polarization waveguide output ports 9 are arranged in the middle of the main body 8 and are perpendicular to the main body 8; the two output ports have different lengths, so that interference can not occur when other components are installed and connected, and the installation structure is more stable and reliable.
The number of the speakers 1 set in this embodiment is not unique, and the number may be set according to actual needs, and this embodiment is optimized and one of the feasible options is adopted: the number of the horn 1 and the number of the orthogonal coupling pieces are four, and two adjacent orthogonal coupling pieces rotate by 90 degrees on the axis. When the scheme is adopted, the loudspeaker 1 and the orthogonal coupling pieces can be arranged in two rows and two columns; the adjacent two orthogonal coupling pieces have an angle difference, so that the adjacent two orthogonal coupling pieces can avoid installation interference.
Preferably, in order to improve the installation reliability of the coaxial waveguide 10 and avoid installation interference, the present embodiment optimizes the structure of the coaxial waveguide 10 and adopts one of the following feasible options: as shown in fig. 3 and 5, the coaxial waveguides 10 have at least two lengths, and the lengths of the adjacent coaxial waveguides 10 are different. By adopting the scheme, when other parts are connected and installed between the coaxial waveguide parts 10 with different lengths, the mutual interference can not occur, and the coaxial waveguide parts 10 can conduct electromagnetic signals more stably and reliably after being connected with other parts.
In order to further improve the installation reliability of the coaxial waveguides 10, the arrangement of two adjacent coaxial waveguides 10 is optimized and improved, and the following feasible options can be adopted: as shown in fig. 3 and 5, two adjacent coaxial waveguides 10 are rotated by 90 ° in the axial direction.
Preferably, the angular difference between two adjacent coaxial waveguides 10 is 90 °, which can be achieved by various matching schemes, and the present embodiment is optimized and adopts one of the feasible options: one of the coaxial waveguides 10 is rotated 45 ° with respect to the axis of the orthogonal coupling member to which it is connected, and the two coaxial waveguides 10 adjacent to that coaxial waveguide 10 are rotated 45 ° in opposite directions. With such a scheme, it is possible not only to make an angular difference between adjacent coaxial waveguides 10 to avoid mounting errors, but also to make the coaxial waveguides 10 and orthogonal coupling pieces angular difference to avoid mounting errors.
The above embodiments are just exemplified in the present embodiment, but the present embodiment is not limited to the above alternative embodiments, and those skilled in the art can obtain other various embodiments by arbitrarily combining with each other according to the above embodiments, and any other various embodiments can be obtained by anyone in light of the present embodiment. The above detailed description should not be construed as limiting the scope of the present embodiments, which should be defined in the claims, and the description should be used for interpreting the claims.
Claims (8)
1. A compact feed array structure of reflector antenna is characterized in that: the mounting structure comprises a mounting plate (4), wherein a plurality of mounting holes (5) are arranged on the mounting plate (4) in rows and columns, a plurality of loudspeakers (1) are arranged on one side of the mounting plate (4), the loudspeakers (1) are in one-to-one correspondence with the mounting holes (5) and are communicated with the mounting holes, the wide-mouth end of each loudspeaker (1) is far away from the mounting plate (4), and the closing-end of each loudspeaker (1) is attached to the mounting plate (4) and is concentric with the mounting holes (5); a flange structure (2) is arranged at the closing end of the horn (1), a connecting structure corresponding to the flange structure (2) is arranged on the mounting plate (4), and the flange structure (2) on the horn (1) is correspondingly matched with the connecting structure and is fixedly connected through a fastener (7); the other side of the mounting plate (4) is provided with a plurality of orthogonal coupling pieces, the front ends of the orthogonal coupling pieces are connected with the mounting plate (4) and are communicated with the mounting holes (5) in a one-to-one correspondence manner, the front ends of the orthogonal coupling pieces are provided with flange structures (2) and correspond to the connecting structures, and the fastening pieces (7) penetrate through the horn (1) and the flange structures (2) on the orthogonal coupling pieces and realize connection and fastening; the rear end of the orthogonal coupling piece is connected with a coaxial wave guide (10).
2. The compact feed array structure of reflector antennas of claim 1, wherein: the closing end of the horn (1) protrudes out of the connecting binding surface of the flange structure (2) and the mounting plate (4), and the closing end of the horn (1) extends into the mounting hole (5) of the mounting plate (4); the front end of the orthogonal coupling piece comprises a structure extending into the mounting hole (5), and the front end of the orthogonal coupling piece is the same as the caliber of the receiving end of the horn (1) in size and is aligned and attached.
3. The compact feed array structure of reflector antennas of claim 1, wherein: the two sides of mounting panel (4) all be provided with sunk structure (6), mounting hole (5) set up in sunk structure (6), the flange structure (2) of quadrature coupling piece and loudspeaker (1) set up in sunk structure (6).
4. The compact feed array structure of reflector antenna as claimed in any one of claims 1-2, wherein: the orthogonal coupling piece comprises a main body (8), wherein two low-frequency orthogonal linearly polarized waveguide output ports (9) are arranged on the main body (8), the directions of the two low-frequency orthogonal linearly polarized waveguide output ports (9) are perpendicular to each other, and the lengths of the two orthogonal linearly polarized waveguide output ports (9) are different.
5. The compact feed array structure of reflector antennas of claim 4, wherein: the number of the horn (1) and the number of the orthogonal coupling pieces are four, and two adjacent orthogonal coupling pieces rotate by 90 degrees on the axis.
6. The compact feed array structure of reflector antennas of claim 1, wherein: the coaxial wave-guide members (10) have at least two lengths, and the lengths of the adjacent coaxial wave-guide members (10) are different.
7. The compact feed array structure of reflector antenna as claimed in claim 1 or 6, wherein: two adjacent coaxial wave-guide members (10) are rotated through 90 DEG on the axis.
8. The compact feed array structure of reflector antennas of claim 7, wherein: one of the coaxial waveguides (10) is rotated 45 ° relative to the axis of the orthogonal coupling member to which it is connected, and the two coaxial waveguides (10) adjacent to that coaxial waveguide (10) are rotated 45 ° in opposite directions.
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