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Beam-deflection using gradient refractive-index media for 60-GHz end-fire antenna

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Dadgarpour, Abdolmehdi, Zarghooni, Behnam, Virdee, Bal Singh and Denidni, Tayeb A. (2015) Beam-deflection using gradient refractive-index media for 60-GHz end-fire antenna. IEEE Transactions on Antennas and Propagation, 63 (8). pp. 3768-3774. ISSN 0018-926X

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Abstract

This communication describes a beam-tilting technique for planar dipole antennas utilizing gradient refractive-index metamaterial (GRIM) unit-cells. Beam-deflection mechanism is based on the phase shift phenomena resulting from the interaction of the EM waves with media of different refractive-indices implemented using GRIM unit-cells. The GRIM unit-cell comprises of a stub-loaded I-shaped resonant structure that is directly integrated onto the dipole antenna. The simulation and experimental results show that an antenna with a 5 × 4 array of GRIM unit-cells can steer the main beam in the E-plane by +26° with respect to the end-fire direction over 57-64 GHz. The antenna exhibits 4-dB gain enhancement and S11 better than -10 dB from 57-64 GHz. It is also shown that a quad-feed dipole antenna with GRIM arrays can deflect the beam by ±56°.

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