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Feed source of corrugated horn for improving cross polarization characterisitics of offset parabolic antenna

A parabolic antenna, corrugated horn technology, applied in waveguide horn, radio relay system, active electrical relay system, etc., can solve the problems of limitation, difficult feed support structure, unfavorable use of vehicle-mounted mobile station, etc., to achieve enhanced Stability, effect of shortening the feed support structure

Inactive Publication Date: 2003-07-16
ELECTRONICS INST NO 54 MINIST OF INFORMATION IND
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Problems solved by technology

However, because the bias structure destroys the symmetry of the antenna structure, the single bias parabolic antenna has a serious disadvantage, namely: the depolarization characteristic when using linear polarization and the beam tilt phenomenon when using circular polarization. In high-performance communication systems, especially in satellite communication systems using frequency reuse systems, it is not allowed to appear, thus limiting the practical application of single-biased parabolic antennas in the field of satellite communication
[0003] In order to improve the cross-polarization characteristics of single-biased parabolic antennas, domestic and foreign researchers generally adopt technical measures to increase the focal length-to-diameter ratio of the parabolic dish antenna. However, using a large focal length-to-diameter ratio will bring difficulties to the support structure of the feed. , and the longer the support structure of the feed source, the greater the structural deformation, and it is difficult to guarantee the overall electrical performance of the antenna. The single-offset parabolic antenna with a large focal length to diameter ratio is not conducive to the use of vehicle-mounted mobile stations.
In addition, even if the focal length diameter ratio is increased to 0.9, its cross-polarization level is difficult to reach the network access specification of less than -33dB within the 1dB point range of the main beam stipulated by the satellite organization

Method used

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  • Feed source of corrugated horn for improving cross polarization characterisitics of offset parabolic antenna
  • Feed source of corrugated horn for improving cross polarization characterisitics of offset parabolic antenna
  • Feed source of corrugated horn for improving cross polarization characterisitics of offset parabolic antenna

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Embodiment Construction

[0016] refer to figure 1 , figure 2 The present invention consists of a double-mode corrugated horn 1 with a corrugated groove 19 structure, a high-order mode propagation light-wall circular waveguide 12, an exciter 2 with a high-order mode cut-off light-wall circular waveguide 13 structure, and a cavity cover plate 3. Among them, 1 to 5 coupling cavities 4 structures are processed on the peripheral wall of the high-order mode propagation optical wall circular waveguide 12 of the exciter 2, and 1 to 5 coupling cavities 4 and the peripheral inner wall of the high-order mode propagation optical wall circular waveguide 12 are processed 1 To the structure of five coupling holes 5, the high-order mode propagation optical wall circular waveguide 12 and the high-order mode cut-off optical wall circular waveguide 13 of the exciter 2 are processed into an integral structure. The function of the exciter 2 is to generate a TE21 high-order mode electromagnetic wave signal in the high-or...

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Abstract

A feed source of corrugated horn for improving the cross polarization characteristics of offset parabolic antenna is composed of dual-mode corrugated horn and exciter consisting of circular waveguide, couple cavity and couple hole. The principal mode (HE11 mode) of said horn is used to ensure that the antenna has high gain and low side lobe. Its higher mode (HE21 mode) is used to lower the cross polarization level of antenna. It has simple structure, and can be used for satellite communication antenna in Ku band.

Description

technical field [0001] The invention relates to a corrugated horn feed source which improves the cross-polarization characteristics of a biased parabolic antenna in the field of communication antennas, and is especially suitable for single-biased feeders with high gain, low sidelobe and low cross-polarization performance in Ku-band satellite communication systems The parabolic antenna is used as the feed device, especially suitable for the single offset parabolic antenna with small focal length diameter ratio required by the vehicle satellite communication system as the feed device. Background technique [0002] Single offset parabolic antennas are often used in communication systems that require high gain and low sidelobe radiation characteristics. Because the feed source and its supporting structure avoid the optical path of incident waves and reflected waves, high gain and low sidelobes are obtained. characteristic. However, because the bias structure destroys the symmet...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q13/02H04B7/15
Inventor 杨可忠李鹏图王俊义周建寨陈茂友
Owner ELECTRONICS INST NO 54 MINIST OF INFORMATION IND
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