A NRI-TL Metamaterial Leaky-Wave Antenna Radiating at Broadside With Zero Beam-Squinting
Date
2018ISSN
1548-5757Source
IEEE Antennas and Wireless Propagation LettersVolume
17Issue
12Pages
2223-2227Google Scholar check
Metadata
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An implementation of a planar fixed-beam leaky-wave antenna that radiates at broadside is presented, consisting of a periodic arrangement of negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. Using an experimental prototype of the antenna, it is shown that each branch of the antenna radiates a beam in opposite directions, and the combination of the two beams results in a symmetric broadside beam over a wide measured zero-beam-squinting bandwidth of 1.1 GHz (23%) around the design frequency of 5 GHz. This is well within the 80% measured -10 dB reflection coefficient bandwith. Furthermore, the antenna has a size of 3.42λ0 × 0.125λ0 × 0.025λ0 at 5 GHz.