F. Schnieder, R. Doerner, W. Heinrich

Published in:

IEEE Microwave and Guided Wave Lett., vol. 6, no. 3, pp. 117-119 (1996).

Abstract:

The conventional MMIC coplanar line covers an impedance range from about 30-80 Ω. Values outside this range cannot be fabricated reliably or cause excessive losses, For several applications, however, it is desirable to use high-impedance lines (e,g., for reduced-size couplers and nonlinear transmission lines). This letter reports results from experiment and electromagnetic simulation for a coplanar waveguide (CPW) structure with an elevated center conductor realized by an air-bridge technique. We achieve wave impedances of about 100 Ω at a lower attenuation level as conventional 50-Ω CPW's of comparable size.

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