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Subwavelength Planar Leaky-Wave Components With Metamaterial Bilayers

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4 Author(s)
Alu, A. ; Dept. of Appl. Electron., Univ. di Roma Tre ; Bilotti, F. ; Engheta, N. ; Vegni, L.

The potential use of metamaterial planar bilayers for synthesizing compact subwavelength leaky-wave radiators in the microwave regime is analyzed in detail. In particular, the possibility of pairing "complementary" metamaterials in order to reduce the dimensions of microwave components is explored for the leaky-wave operation of an open waveguide consisting of a grounded pair of planar layers. In connection with our similar findings in other setups employing such complementary pairings, here we show how the compact resonance at the interface between "negative" and "positive" materials may also be properly exploited in this context. Choosing materials with low constitutive parameters, moreover, shows to be effective for enhancing the directivity of these components. We explore in detail the notable guidance and radiation properties of the anomalous natural modes supported by these bilayered structures, giving some physical insights into the anomalous phenomenon and considering the possible limitations in some realistic setups

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:55 ,  Issue: 3 )

Date of Publication:

March 2007

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