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A Waveguide to Unenclosed Coplanar Waveguide Transition

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3 Author(s)
Reck, T. ; Charles L. Brown Dept. of Electr. Eng., Univ. of Virginia, Charlottesville, VA, USA ; Weikle, R.M. ; Barker, N.S.

A transition from rectangular waveguide to unenclosed coplanar waveguide (CPW) is designed and tested at W -band. Full-wave finite-element analysis is applied to the design and optimization trends are shown for the critical parameters. A stepped-impedance filter suppresses a parasitic mode, which is generated as the circuit emerges from the waveguide block, and a rejection of -20 dB is achieved. A back-to-back structure is used to characterize the performance of the transition and an insertion loss of 1.6 dB from 75 to 100 GHz is measured. Removing line losses, a single transition insertion loss of 0.46 dB is obtained.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:58 ,  Issue: 9 )