Title :
Surface wave excitation on a microstrip ring antenna
Author :
Barroso de Assis Fonseca, S. ; Soares, A.J.M. ; Giarola, A.J.
Author_Institution :
Dept. of Electr. Eng., Brasilia Univ., Brazil
Abstract :
A theoretical analysis of surface wave excitation in microstrip ring antennas is presented. The problem is formulated using dyadic Green´s functions with the space and surface wave fields obtained separately. The radiation efficiency is calculated for the TM/sub 11/, TM/sub 12/, and TM/sub 13/ modes. It is shown that the efficiency of the TM/sub 13/ mode has a maximum for a specified dielectric substrate. In addition, the efficiency of the TM/sub 11/, TM/sub 12/ and TM/sub 13/ modes approaches zero for increasing values of dielectric substrate thickness. The results shown here are of particular importance for the design of these antennas.<>
Keywords :
Green´s function methods; antenna theory; dielectric-loaded antennas; microstrip antennas; dielectric substrate; dyadic Green´s functions; microstrip ring antenna; radiation efficiency; surface wave excitation; Antenna arrays; Dielectric losses; Dielectric substrates; Green´s function methods; Integral equations; Magnetic separation; Microstrip antenna arrays; Microstrip antennas; Permittivity; Surface waves;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1988. AP-S. Digest
Conference_Location :
Syracuse, NY, USA
DOI :
10.1109/APS.1988.94264
