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Infinite Wavelength Resonant Antennas With Monopolar Radiation Pattern Based on Periodic Structures

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3 Author(s)
Lai, Anthony ; Dept. of Electr. Eng., California Univ., Los Angeles, CA ; Leong, K.M.K.H. ; Itoh, T.

The analysis of resonant-type antennas based on the fundamental infinite wavelength supported by certain periodic structures is presented. Since the phase shift is zero for a unit-cell that supports an infinite wavelength, the physical size of the antenna can be arbitrary; the antenna's size is independent of the resonance phenomenon. The antenna's operational frequency depends only on its unit-cell and the antenna's physical size depends on the number of unit-cells. In particular, the unit-cell is based on the composite right/left-handed (CRLH) metamaterial transmission line (TL). It is shown that the CRLH TL is a general model for the required unit-cell, which includes a nonessential series capacitance for the generation of an infinite wavelength. The analysis and design of the required unit-cell is discussed based upon field distributions and dispersion diagrams. It is also shown that the supported infinite wavelength can be used to generate a monopolar radiation pattern. Infinite wavelength resonant antennas are realized with different number of unit-cells to demonstrate the infinite wavelength resonance

Published in:

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

Date of Publication:

March 2007

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