DocumentCode :
2487028
Title :
High frequency Green´s function for tapered planar arrays
Author :
Capolino, F. ; Maci, S. ; Mariottini, F. ; Felsen, L.B.
Author_Institution :
Dipt. Ingegneria dell´Inf., Siena Univ., Italy
Volume :
1
fYear :
2000
fDate :
16-21 July 2000
Firstpage :
90
Abstract :
The array Green\´s function (AGF) is the basic building block for the full-wave analysis of planar phased array antennas. Its representation in terms of element-by-element summation over the individual dipole radiations can be replaced by a more efficient global representation constructed via Poisson summation. The resulting Poisson-transformed integrals can be interpreted as the radiation from continuous equivalent Floquet wave (FW)-matched source distributions extending over the array aperture. Applying high-frequency asymptotics to each FW-matched array aperture casts the AGF in the format of a generalized geometrical theory of diffraction (GTD) which includes conical wavefront edge diffracted rays as well as spherical wavefront vertex diffracted rays. In this paper, the results which are valid for equiamplitude excitation, are extended to accommodate tapered illumination, which also includes dipole amplitudes tending to zero at the edges. This extension is carried out by a direct Poisson-transformed asymptotic evaluation of the strip-array GF, with the inclusion of asymptotically subdominant "slope" diffracted fields, in addition to the dominant diffracted fields for appreciable edge illumination.
Keywords :
Green´s function methods; Poisson equation; antenna phased arrays; dipole antenna arrays; geometrical theory of diffraction; integral equations; planar antenna arrays; Floquet wave-matched source distributions; GTD; HF Green´s function; Poisson summation; Poisson-transformed integrals; array Green´s function; array aperture; conical wavefront edge diffracted rays; continuous equivalent Floquet wave; dipole amplitudes; dipole radiations; edge illumination; equiamplitude excitation; full-wave analysis; geometrical theory of diffraction; high frequency Green´s function; high-frequency asymptotics; linearly phased dipoles; planar phased array antennas; slope diffracted fields; spherical wavefront vertex diffracted rays; tapered illumination; tapered planar arrays; Antenna arrays; Apertures; Diffraction; Dipole antennas; Discrete Fourier transforms; Frequency; Green´s function methods; Lighting; Phased arrays; Planar arrays;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Society International Symposium, 2000. IEEE
Conference_Location :
Salt Lake City, UT, USA
Print_ISBN :
0-7803-6369-8
Type :
conf
DOI :
10.1109/APS.2000.873718
Filename :
873718
Link To Document :
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