Title :
Formulas by synthetic asymptote for TM/sub 0/ surface wave pole locations of a microstrip substrate
Author :
Tang, W.C. ; Chow, Y.L.
Author_Institution :
City Univ. of Hong Kong, China
Abstract :
It is convenient to have simple formulas to determine the pole locations of the surface wave in the Green´s function instead of searching in spectral space. In many practical circuits, to avoid excessive radiation and surface wave losses, the frequency is kept low for a given substrate thickness. This leads to the existence of only one surface wave mode TM/sub 0/. The formula is synthesized from the asymptotes of the original transcendental equations. With the pole located it is easy to find the pole amplitude with existing formulas.
Keywords :
Green´s function methods; microstrip lines; modal analysis; poles and zeros; waveguide theory; Green´s function; TM/sub 0/ surface wave pole locations; microstrip substrate; pole amplitude; radiation losses; substrate thickness; surface wave losses; surface wave mode; synthetic asymptote formulas; transcendental equations; Circuit synthesis; Cutoff frequency; Dielectric constant; Dielectric substrates; Equations; Microstrip; Microwave frequencies; Propagation constant; Surface treatment; Surface waves;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2000. IEEE
Conference_Location :
Salt Lake City, UT, USA
Print_ISBN :
0-7803-6369-8
DOI :
10.1109/APS.2000.874484
