Compact UWB monopole antenna with enhanced bandwidth using rotated L‐shaped slots and parasitic structures

In this article, a new design of compact ultrawideband (UWB) monopole antenna is presented .The antenna consists of a ordinary square radiating patch and a ground plane with pairs of rotated L-shaped slots and parasitic structures. By cutting a pair of rotated L-shaped slots and also by embedding a pair of rotate L-shaped conductor-backed plane in air gap distance, additional resonances are excited and much wider impedance bandwidth can be produced. Also, the usable upper frequency of the antenna is extended from 10.3 to 18.31 GHz. Simulated and measured results show that the antenna design exhibits an operating bandwidth (VSWR < 2) from 3.09 to 18.31 GHz which provides a wide usable fractional bandwidth of more than 140%. The proposed antenna has an ordinary square radiating patch, therefore, displays a good omnidirectional radiation pattern even at higher frequencies. The antenna configuration is simple, easy to fabricate, and can be integrated into UWB systems. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:175–178, 2014