Abstract
AbstractIn this article, a low‐profile, high‐gain, ultra‐wideband (UWB) planar dipole antenna is presented for radar imaging applications. The antenna is loaded with open complementary double concentric split‐hexagonal‐ring resonators (LC tank) and chip resistors, and backed with a novel double‐layer frequency selective surface reflector for gain enhancement. A broadband microstrip to parallel‐plate transformer is designed as the feeding structure of the antenna to provide impedance matching and balanced‐to‐unbalanced transition. The measurement results show the proposed antenna operates over the frequency bandwidth of 0.65–3.8 GHz with S11< −10 dB (VSWR) and smooth gains in the range of 6.2–9 dBi. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2369–2373, 2014
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