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Study of the Hourglass Reflector Antenna with Shaped Beam

Author: GuanRui
Tutor: ZhangXiaoMiao
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Hourglass reflector antenna Beamforming Array Feed Shaped Reflector
CLC: TN823.27
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract


Thesis on the hourglass reflector antenna far field pattern for the analysis and synthesis . The work is divided into two parts: first , the application of physical optics (PO) analyzed the hourglass reflector antenna far field pattern characteristics ; Second , the application of real-coded genetic algorithm (RGA), by optimizing the feed incentive coefficient , change the shape of the reflecting surface , mixing , etc., to achieve the hourglass reflector antenna beamforming . Main work is as follows: This paper analyzes the single feed when the in-focus and defocus hourglass reflector antenna radiation characteristics : Discuss the feed in focus , rotate the radius R, coke diameter ratio F / D and edge radiation levels and other parameters ET hourglass reflector antennas for far field pattern of influence ; study were axial feed (Zf) and transverse (Xf, Yf) defocus , the hourglass reflector antenna far field pattern changes . On this basis , the paper mainly hourglass reflector antenna beamforming conducted research . First, by controlling the hourglass reflection coefficient plane array feed incentives for the far field pattern shaping . To 7 yuan ring array, for example , on the horizontal plane pattern is optimized to achieve a pen-shaped and other common cosecant squared pattern . Since the ring array can only integrated horizontal pattern , we propose a curved array programs, and to 5 × 7 array , for example, a pen-shaped and rectangular comprehensive two stereoisomers direction , illustrating the feasibility of the program . Subsequently , by optimizing the shape of the reflector to achieve a single feed elevation plane pattern of imprinting . This article will surface with a reflective surface Bernstein polynomials and Jacobi-Fourier function expansion , by optimizing the expansion coefficients obtained in the pitch plane cosecant squared flat top beam . By comparison, summarizes the advantages and disadvantages of two kinds function expansion . Finally, the optimized array fed reflector shape incentives and combine both methods , while achieving a horizontal direction and the pitch surface shaped figure .

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