CHARACTERIZATION OF AIR-BRIDGES IN MM-WAVE, COPLANAR WAVE-GUIDE USINGTHE COMPLETE MODE SPECTRUM OF CPW

This paper presents a novel analysis of air-bridges in open CPW, inclu ding the effects of finite thickness metallisation, using the complete modal spectrum of the CPW. This is a technique which, in comparison w ith other methods, allows the common features of CPW circuitry to be e xtracted and preprocessed without consideration of the particular prob lem in hand, that is, suitable basis upon which to build a CAD package for smaller computers. Using this approach, scattering parameters, ra diation and substrate leakage patterns of isolated bridges have been d erived for both types of fundamental mode incidence and compared, wher e possible, to those obtained from other methods. Furthermore, pairs o f bridges, coupled by both the near and far fields, have been analysed .