Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 63, Issue 11, Pages 3558-3567Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2015.2479589
Keywords
Electromagnetic metamaterials; feed networks; matching; near-field radiation pattern
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Funding
- National Science Foundation CAREER Award [ECCS-0953311]
- Air Force Office of Scientific Research [FA9550-13-1-0204]
- Defense Threat Reduction Agency [HDTRA1-12-1-0022]
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We experimentally verify the unusual radiation properties of sources placed inside and in the neighborhood of effective epsilon-near-zero narrow (ENZ) channels. By utilizing the unique properties of a narrow waveguide channel operated at cutoff, a static-like uniformly enhanced electric field distribution can be induced at microwave frequencies over long distances. First, we show how this field uniformity provides a mechanism for position-invariant impedance matching for localized sources placed within the channel, enabling a unique coaxial-to-waveguide matching highly invariant to discontinuities. We then extend these concepts to sources placed outside the ENZ channels, realizing a microwave lens with unique radiation patterning properties. The realized ENZ lens is experimentally demonstrated under several excitation conditions, highlighting the possibility of tailoring the impinging wavefront with large flexibility.
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