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Coaxial-to-Waveguide Matching With \varepsilon -Near-Zero Ultranarrow Channels and Bends

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2 Author(s)
Andrea Alu ; Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, U.S.A. ; Nader Engheta

We propose the use of metamaterial-inspired ultranarrow channels at cutoff to realize an interesting matching between a coaxial antenna and a waveguide. The anomalous properties of a channel at cutoff, analogous to those of zero permittivity materials, allow a simple matching design, valid for arbitrary waveguides, with large degrees of freedom in terms of geometry, length and possible bending of the connecting channel. Moreover, the static-like properties of the channel allow such matching, independent of the relative position of the antenna and possible bending and abruptions along the channel.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:58 ,  Issue: 2 )