NDLI: An efficient hybrid UTD-CSB-VWF approach for the analysis of large reflector antennas

Content Provider	IEEE Xplore Digital Library
Author	Pathak, P.H. Kim, Y. Burkholder, R.J. Lee, T.-H.
Copyright Year	2010
Description	Author affiliation: The Ohio State University, ElectroScience Lab. Dept. of ECE, 1320 Kinnear Road, Columbus, 43212, USA (Pathak, P.H.; Kim, Y.; Burkholder, R.J.; Lee, T.-H.)
Abstract	A relatively efficient and accurate hybrid analysis for predicting the radiation patterns of large reflector antennas illuminated by realistic feeds is developed in this paper. The problem is decomposed into three main parts. First, the measured radiation pattern of the feed with the reflector absent is represented in terms of a spherical vector wave function expansion. The latter expansion directly provides the equivalent sources on the smallest mathematical spherical surface that encapsulates the feed; these equivalent sources generate the same fields external to the encapsulated sphere (with the feed absent) as those produced by the original feed. Secondly, an analytic continuation of the encapsulating sphere into complex coordinate space allows the fields generated by the equivalent sources on the complex sphere to be represented by a discrete sum of complex source beams which then illuminate the reflector. Finally it is possible to use an analytic continuation of the uniform geometrical theory of diffraction for calculating the reflection and diffraction of each complex source beam by the reflector surface and its edge, respectively, after the latter are continued into complex space. Most importantly, the reflection and diffraction of only a few complex source beams contribute to the reflector radiation pattern in any given direction thereby making the method highly efficient as well as more accurate when compared to the conventional numerical physical optics integration over the large reflector surface. Examples will be presented to illustrate the concept of this hybrid approach.
Starting Page	847
Ending Page	849
File Size	279599
Page Count	3
File Format	PDF
ISBN	9781424451555
e-ISBN	9781424451548
DOI	10.1109/URSI-EMTS.2010.5637316
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-16
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Strontium Diffraction Reflector antennas Reflection Feeds Optical surface waves Antenna radiation patterns
Content Type	Text
Resource Type	Article

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