Ultra-wideband antenna using Minkowski-like fractal geometry

In this letter, a Minkowski-like fractal geometry-based ultra-wideband (UWB) monopole antenna is proposed and investigated. The radiator of the antenna is designed using similar segments of the Minkowski-like structure. The multiple resonance phenomena of fractal geometry are utilized in the proposed structure to obtain the wideband operability by repetition of similar segments in the radiator structure of the antenna. The self-similar nature of this geometry provides higher effective antenna length and wide operating bandwidth. The multiple slots are introduced in the ground plane to improve the reflection coefficient over the entire UWB frequency range. The proposed antenna has an optimized dimension of 23.5 × 26.5 mm2 and shows the operating bandwidth from 1.4 to 10.4 GHz. The proposed design is fabricated, and its measured result shows good agreement with the simulated one. The proposed antenna exhibits nearly omnidirectional radiation pattern, proper impedance matching over the entire UWB frequency range. © 2014 Wiley Periodicals, Inc.