Beam-Squinting Reduction of Leaky-Wave Antennas Using Huygens Metasurfaces
Aidin Mehdipour, Joseph W. Wong, George V. Eleftheriades
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
VOL. 63, NO. 3, MARCH 2015
pp 978 - 992
Beam squinting, frequency scanning, generalized law of refraction, Huygens sources, leaky-wave antennas (LWAs), metamaterials, metasurfaces
A novel approach is presented to reduce the beam squinting of radiating structures with emphasis on leaky-wave antennas (LWAs). This is achieved by taking advantage of the interesting frequency-dependent variation of the generalized law of refraction in metasurfaces, in combination with the beamsquinting characteristics of LWAs dictated by their dispersion diagram. An X-band coplanar waveguide leaky-wave antenna (CPW-LWA) and a Huygens metasurface are fabricated and experimental results verify that the proposed concept can reduce the beam squinting of the LWA by 50% over a 10% bandwidth at angles around broadside. The proposed method is shown to be a excellent approach to build simple, low-profile, and lowcost communication systems composed of LWAs with low beam-squinting characteristics over a reasonably wide frequency range.
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