Full-wave analysis of the annular-ring loaded spherical-circular microstrip antenna

Author

Chen, Hong-Twu ; Chen, Horng-Dean ; Cheng, Yuan-Tung

Author_Institution

Dept. of Electr. Eng., Chinese Mil. Acad., Fong-Shan, Taiwan

Volume

45

Issue

11

fYear

1997

fDate

11/1/1997 12:00:00 AM

Firstpage

1581

Lastpage

1583

Abstract

In this paper, an annular-ring loaded (ARL) spherical-circular microstrip antenna is studied theoretically. The antenna is excited by a coaxial probe. The theoretical formulation is based on full-wave analysis in the spectral domain by using the vector Legendre transform and Galerkin´s moment method is used for numerical calculation. Numerical results of the resonance frequencies, input impedance, voltage standing wave ratio (VSWR), and radiation characteristics are presented. It is shown that the impedance bandwidth of the spherical-circular microstrip antenna can be broadened by adding an annular-ring parasitic patch. By comparing to the single circular-patch case the spherical-circular microstrip antenna with an annular-ring parasitic patch has larger minor lobes and larger cross-polarization radiation

Keywords

Galerkin method; antenna radiation patterns; conformal antennas; electric impedance; loop antennas; method of moments; microstrip antennas; spectral-domain analysis; transforms; Galerkin´s moment method; annular-ring loaded spherical-circular microstrip antenna; annular-ring parasitic patch; coaxial probe; cross-polarization radiation; full-wave analysis; impedance bandwidth; input impedance; minor lobes; numerical calculation; radiation characteristics; resonance frequencies; single circular-patch case; spectral domain; vector Legendre transform; voltage standing wave ratio; Antenna theory; Coaxial components; Impedance; Loaded antennas; Microstrip antennas; Moment methods; Probes; Resonance; Resonant frequency; Spectral analysis;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.650068

Filename

650068