A QUASI-CLOSED FORM EXPRESSION FOR THE CONDUCTOR LOSS OF CPW LINES, WITH AN INVESTIGATION OF EDGE SHAPE EFFECTS

In previous work, we used a matched asymptotic technique to investigat e the fields near an edge of a finitely conducting strip with nonzero thickness, It was demonstrated that with this asymptotic solution of t he fields, the power loss in the region local to the edge could be det ermined accurately, In this paper, we will show how the accurate repre sentation of the power loss can be used to obtain a dosed form express ion for the attenuation constant due to;conductor loss of coplanar wav eguide (CPW) structures, This expression is valid for an arbitrarily s haped edge and any conductor thickness, Results obtained with this exp ression are compared to and closely agree with both experimental resul ts and other techniques found in the literature. We also investigated conductors with different edge shapes (45 degrees and 90 degrees edges ) to explore their effect on the attenuation constant (or loss) of CPW structures.