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Omnidirectional Metamaterial Antennas Based on \varepsilon -Near-Zero Channel Matching

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4 Author(s)
Soric, J.C. ; Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA ; Engheta, N. ; Maci, S. ; Alu, A.

We present an analytical model and practical design tools to realize cylindrically-symmetric compact antennas based on the anomalous transmission properties of ε -near-zero (ENZ) ultranarrow radial channels. The flexibility and exotic propagation properties in ENZ metamaterial channels are exploited here to tune and match cylindrically-symmetric antennas, without the need of complex external matching networks, in order to realize exciting antenna designs in terms of size, complexity and efficiency. We first model a homogenized Drude dispersive ENZ metamaterial channel to feed a radial parallel-plate waveguide; next we suggest a practical realization of this channel by using radial fins; eventually, we apply the obtained design formulas to realize single- and multi-band cylindrical antennas with a wide tunability range. The designed antennas may operate in the ultra-high frequency (UHF) band and may be realistically tuned over a large bandwidth. We envision applications in frequency-hopping, multi-band, compact, omnidirectional antennas.

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Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 1 )