Radiation of an aperture antenna covered by a spherical-shell chiral radome and fed by a circular waveguide

被引：16

作者：

Li, LW ^{[1
]}

Leong, MS ^{[1
]}

Kooi, PS ^{[1
]}

Yeo, TS ^{[1
]}

Qiu, YL ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Elect Engn, Commun & Microwave Div, Singapore 119260, Singapore

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 1998年 / 46卷 / 05期

关键词：

aperture antennas; chiral media; dielectric radome; dyadic Green's function; electromagnetic wave theory;

D O I：

10.1109/8.668909

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 [电气工程]; 0809 [电子科学与技术];

摘要：

This paper presents a full-wave analysis of the radiation characteristics of an aperture antenna that is flush-mounted on a ground plane and fed by a circular waveguide supporting the dominant TE11 mode. The antenna is covered by a dielectric hemispherical chiral radome. Huygen's equivalence principle and the image theory are utilized to simplify the problem, The magnetic dyadic Green's function for the three-layered geometry is formulated and applied to analyze the radiated electromagnetic fields outside the chiral radome. Both the exact and approximate expressions of electric fields valid for the Fresnel and Fraunhofer zones are obtained using the spherical vector nave functions and their approximations in the far zone. Various chiral materials are assumed and computations of antenna parameters are carried out. The effects of the dielectric chiral radome on the radiation power patterns, sidelobe levels, and 3-dB beamwidths are also discussed numerically.

引用

页码：664 / 671

页数：8

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