Gw. Hanson, PROPAGATION CHARACTERISTICS OF MICROSTRIP TRANSMISSION-LINE ON AN ANISOTROPIC MATERIAL RIDGE, IEEE transactions on microwave theory and techniques, 43(11), 1995, pp. 2608-2613
A microstrip transmission line residing on an electrically anisotropic
material ridge embedded in a multilayered environment is studied usin
g a coupled set of integral equations (IE's). The full-wave IE formula
tion easily accommodates arbitrary material anisotropy and inhomogenei
ty in the finite ridge region using equivalent polarization currents r
esiding in a multilayered isotropic background. New results are presen
ted for uniaxially anisotropic ridge structures which show that the tr
ansmission line propagation constant is sensitive to anisotropy for ce
rtain ridge structures and insensitive for others, compared to the con
ventional line on an infinite substrate. Results are also presented fo
r a transmission line printed on a nonreciprocal solid-state magnetopl
asma ridge, The current distribution associated with the dominant micr
ostrip mode is investigated, where it is found that the transverse com
ponent of current is much larger for the ridge geometry than for the i
nfinite substrate case, although the transverse component is still sma
ll compared to the longitudinal component.