DocumentCode :
290970
Title :
Influence of a curved FSS on the radiation patterns of an enclosed source
Author :
Philips, B. ; Parker, E.A. ; Langley, R.J.
Author_Institution :
Kent Univ., Canterbury, UK
fYear :
1995
fDate :
4-7 Apr 1995
Firstpage :
524
Abstract :
In order to study the effects of a dielectric embedded FSS on an enclosed antenna pattern, the authors adopt the ray tracing technique to compute the near field pattern of the antenna-FSS configuration exterior to the structure, from which the transmission coefficient and the far field patterns can be calculated. They use parabolic and paraboloidal shapes formed from a dielectric slab with an embedded slot ring FSS which, when it is planar, provides a flat passband transmission window. Rings have been chosen with a view to minimise polarization dependence of the element although the method is applicable to arbitrary FSS arrays and surfaces of arbitrary shape. The approach adopted is based on tracing multiple ray paths through the curved dielectric slab with the FSS treated as an infinitesimally thin interface with known reflection and transmission coefficients. In this manner, a structure composed of an FSS embedded in a dielectric can be treated as a series of interfaces where the incident ray is partially specularly reflected and partially transmitted according to the reflection and transmission dyadics at the point of incidence, until it emerges on the other side of the radome or decays to a level below a prescribed threshold. With a sufficiently dense bundle of input rays from the source, the radiation pattern transmitted through the radome can be computed using two dimensional interpolation on the transmitted rays
Keywords :
antenna radiation patterns; electromagnetic wave reflection; electromagnetic wave transmission; frequency selective surfaces; horn antennas; radomes; ray tracing; 2 to 25 GHz; antenna pattern; curved FSS; curved dielectric slab; dielectric embedded FSS; dielectric slab; embedded slot ring FSS; enclosed source; infinitesimally thin interface; near field pattern; parabolic shapes; paraboloidal shapes; polarization dependence; radiation patterns; radome; ray tracing technique; reflection coefficient; transmission coefficient; two dimensional interpolation;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407)
Conference_Location :
Eindhoven
Print_ISBN :
0-85296-637-7
Type :
conf
DOI :
10.1049/cp:19950367
Filename :
396277
Link To Document :
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