Abstract
AbstractA slot antenna for ultra‐wide band (UWB) application with a compact size, enhanced bandwidth, low profile, flat gain characteristic and omnidirectional radiation pattern is presented in this article. This antenna fed by microstrip to slot line is designed and fabricated on an FR4 substrate with a half‐wavelength rectangular patch as a radiator at low frequency and a pair of quarter‐wavelength long symmetrical slots enhancing the bandwidth at high frequency. This proposed antenna with an overall size of 33 × 10 × 0.8 mm3 (0.33λ0 × 0.1λ0 × 0.008λ0 at 3 GHz) has a |S11| < −10‐dB bandwidth of 3.08‐12.14 GHz (119%), a 1‐dB gain bandwidth of 3.04‐10.5 (110%), and a peak gain of 3.08 dBi at 5.45 GHz in Z direction.
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