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Design method of shaped double-offset Gregory antenna with high gain and low side lobe

A Gregorian, low-sidelobe technology, applied in the field of radio astronomy antennas and communication antennas, can solve problems such as not being able to meet SKA, and achieve good cross-polarization performance and high gain effects

Active Publication Date: 2013-10-23
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0007] At present, according to the orifice-surface field distribution given by Sun Yingxiang, Du Biao, and Wu Jianming in the supplementary volume 26 of the "Journal of Radio Science" in October 2011, "A Shape-Forming Method for Double-Biased Gregorian Antennas" The shape-forming function is used to design the antenna. The first side lobe of the antenna is lower than -20dB, and the efficiency is 85%, but it still cannot meet the requirements of SKA. It is necessary to find a new surface field distribution function

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  • Design method of shaped double-offset Gregory antenna with high gain and low side lobe
  • Design method of shaped double-offset Gregory antenna with high gain and low side lobe
  • Design method of shaped double-offset Gregory antenna with high gain and low side lobe

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Embodiment Construction

[0044] Below, the present invention will be further described in conjunction with the accompanying drawings.

[0045] A kind of design method of high-gain, low-sidelobe shaping double offset Gregorian antenna, it is characterized in that comprising steps:

[0046] (1) Design the main and secondary reflector curves of the symmetrical plane of the antenna in the Cartesian coordinate system XOZ plane;

[0047] On the XOZ plane of the Cartesian coordinate system, that is, on the plane of the spherical coordinate system φ=0° or 180°, according to the pattern function of the feed source and the surface field distribution function of the antenna port, the law of energy conservation and the equal optical path condition are applied to the main and auxiliary The shape-forming design of the reflecting surface is used to obtain the main reflecting surface curve and the sub-reflecting surface curve of the symmetrical surface of the antenna;

[0048] The surface field distribution function...

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Abstract

The invention relates to a design method of a shaped double-offset Gregory antenna with high gain and low side lobe, belonging to the technical fields of radio astronomical antennas and communication antennas and the like. The invention provides a mouth-face field-shaped distribution function, high efficiency is achieved while leading the first side lobe of the antenna to be lower than minus 20dB; the value ranges of adjusting parameters mu and delta are as follows: mu is more than or equal to 0.83 and less than or equal to 0.88, and delta is equal to 0.5; and the value range of the radius R of concentric rings is as follows: R is more than or equal to 0 and less than or equal to Rm. The design for a primary reflecting surface and a secondary reflecting surface of the antenna is finished by shaping the primary reflecting surface and the secondary reflecting surface of the antenna. The antenna designed by the invention has the characteristics of high gain, low side lobe and low cross polarization and the like. The design method is suitable for the design of the antennas in the fields of radio astronomical telescope, satellite communication, radio-frequency spectrum detection and the like.

Description

technical field [0001] The invention relates to a design method of a high-gain, low-sidelobe shaped double-bias Gregorian antenna, relates to the technical fields of radio astronomy antennas and communication antennas, and is suitable for radio astronomy telescopes, satellite communications, radio frequency spectrum detection and other fields Antenna design. Background technique [0002] Square Kilometer Array SKA (Square Kilometer Array) will be the largest synthetic aperture radio telescope in the world. Its receiving area is up to one square kilometer, and its working frequency covers 70MHz-25GHz. The SKA is planned to be composed of 3300 15-meter-diameter parabolic antennas and 250 AA (ApertureArray) low-frequency aperture arrays with a diameter of about 60 meters. Among them, SKA requires that the first side lobe of the 15-meter-caliber parabolic antenna is lower than -20dB, and the efficiency is as high as possible. [0003] The shape-shaped dual-bias antenna adopts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/36H01Q15/16
Inventor 杜彪吴建明孙滢翔
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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