The Near- and Far-Zone Fields of Periodic Spherical Arrays of Dipole Antennas On Spherical Chiral Substrates - Abstract
作者:
W.-Y. Yin,
L.-W. Li,
M.-S. Leong,
期刊:
Journal of Electromagnetic Waves and Applications
(Taylor Available online 2000)
卷期:
Volume 14,
issue 1
页码: 73-75
ISSN:0920-5071
年代: 2000
DOI:10.1163/156939300X00617
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
This paper presents an analytic formulation of the near- and far-field distributions due to periodic spherical arrays of dipole antennas on two spherical biisotropic substrates, i.e., on the chiral sphere and on a perfectly conducting sphere coated with one-layer chiral medium, respectively. For an arbitrary orientation of the dipole antenna array, the dyadic Green's functions in the form of an eigenfunction expansion in terms of the normalized spherical vector wave functions are directly employed. Thereby, exact representations of the radiated fields in both near and far zones are obtained in closed form. They are all in a superposition of right- and left-handed circularly polarized waves, and are also applicable for the cases of spherical arrays of dipole antennas on spherical isotropic substrates. Furthermore, the constitutive parameter effects of the chiral medium on the three-dimensional patterns of the far-zone field and its polarized feature are demonstrated numerically.
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