NDLI: Analysis and experiment of near field of a monopulse shaped ring-focus antenna with arbitrary polarization

Content Provider	IEEE Xplore Digital Library
Author	Zhen Cheng Xinfa Jiang Huai Huang Shanwei Lu
Copyright Year	2000
Description	Author affiliation: Beijing Inst. of Radio Meas., China (Zhen Cheng)
Abstract	A monopulse ring-focus antenna with arbitrary polarization is modeled to evaluate its near-field distribution. To overcome the limitations of the principles of geometrical optics (GO), the physical optics (PO) method is employed to derive a general expression. A feed pattern with arbitrary shape and arbitrary polarization is expressed as a combination of two non-coherent functions, namely, f/sub 1/(/spl theta//sub f/) and f/sub 2/(/spl phi//sub f/). An equivalent focus technique is presented to simplify the expression of the incident field of the main reflector. Furthermore, the dual shaped reflector is fitted with polynomials. By use of the Fourier series expansion, the integral with respect to the /spl phi/ axis of the sub-reflector is analytically evaluated. Through a series of operations, the radiation integral is simplified from four dimensions to three dimensions for near-field distribution. To test the formulae, a C-band monopulse shaped ring-focus antenna, with dual circular polarization and 3.5 m diameter, has been designed and manufactured. Comparison between experimental results and calculations shows good agreement.
Starting Page	277
Ending Page	280
File Size	271601
Page Count	4
File Format	PDF
ISBN	0780363779
DOI	10.1109/ISAPE.2000.894778
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-15
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical polarization Geometrical optics Physical optics Genetic expression Feeds Shape Polynomials Fourier series Near-field radiation pattern Testing
Content Type	Text
Resource Type	Article

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