Title :
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
fDate :
10/1/1989 12:00:00 AM
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;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
