Surface wave excitation on a microstrip ring antenna

Author

Soares, Antonio Jose Martins ; Fonseca, S.B.d.A. ; Giarola, Attilio Jose

Author_Institution

Dept. of Electr. Eng., Brasilia Univ., Brazil

Volume

37

Issue

10

fYear

1989

fDate

10/1/1989 12:00:00 AM

Firstpage

1310

Lastpage

1312

Abstract

A theoretical analysis of the excitation of surface waves on a microstrip ring antenna is presented. The problem is formulated using dyadic Green´s functions in a layered medium with magnetic-type equivalent current sources. The integral equation for the fields is solved in the wave number complex plane so that the fields from space and surface waves are obtained separately. The space wave radiation efficiency is calculated for the TM₁₁, TM₁₂, and TM₁₃ modes for various values of the normalized dielectric substrate thickness, d/λ₀. It is noted that the TM₁₃ mode radiates more efficiently than the TM₁₁ and TM₁₂ modes. The results are of importance in the design of these antennas

Keywords

Green´s function methods; antenna theory; integral equations; microstrip antennas; TM₁₁ modes; TM₁₂ modes; TM₁₃ modes; dielectric substrate thickness; dyadic Green´s functions; integral equation; magnetic-type equivalent current sources; microstrip ring antenna; space wave radiation efficiency; surface wave excitation; wave number complex plane; Antenna theory; Dielectric losses; Dielectric substrates; Integral equations; Magnetic analysis; Magnetic separation; Microstrip antenna arrays; Microstrip antennas; Optical surface waves; Surface waves;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.43540

Filename

43540