Nc. Yuan et al., ANALYTICAL ANALYSES OF V, ELLIPTIC, AND CIRCULAR-SHAPED MICROSHIELD TRANSMISSION-LINES, IEEE transactions on microwave theory and techniques, 42(5), 1994, pp. 855-859
Several new types of monolithic coplanar transmission lines, v, ellipt
ic, and circular-shaped microshield coplanar waveguide, have been prop
osed. The characteristic impedance expressions for those transmission
lines have been derived using the conformal mapping method (CMM) under
the assumption of the pure-TEM propagation and zero dispersion. In th
e analyses of the elliptic and the circular-shaped microshield coplana
r lines, the methods using the graphical approximation and taking the
geometric mean value of the upper and the lower bounds to the size of
the line are put forward to calculate the characteristic impedance of
this two kinds of microshield coplanar lines. The numerical results sh
ow the effects of the different shaped microshield walls on characteri
stic impedances.