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Design and Performance of Coplanar Waveguide Bandpass Filters



Dylan F. Williams, S E. Schwarz


End-coupled resonator bandpass filters built in coplanar waveguide are investigated. The admittance inverter parameters of the coupling gaps between resonant sections are deduced from experiment, and bandpass filter design rules are developed. This allows easy filter synthesis from "prototype" low-pass designs. Measurements of single section resonator quality factors are used to predict filter insertion losses. Several examples of filters realized in coplanar waveguide are presented. Odd-mode coplanar waveguide filter elements that short circuit the even coplanar waveguide mode are investigated. Filter tuning, accomplished by adjusting the height of conducting planes above the resonant filter sections, is demonstrated.
IEEE Transactions on Microwave Theory and Techniques


Williams, D. and Schwarz, S. (1983), Design and Performance of Coplanar Waveguide Bandpass Filters, IEEE Transactions on Microwave Theory and Techniques, [online], (Accessed July 15, 2024)


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Created July 1, 1983, Updated April 16, 2019