Design of a planar inverted F-L antenna (PIFLA) for lower-band UWB applications

This paper examines the case for an ultrawideband planar inverted-F-L-antenna design intended for use in the lower sub-band. The antenna construction is based on the conventional inverted F, and inverted L as its feed element, and parasitic element, respectively. The optimized antenna size is 30×15×4mm
³
. The prototype antenna has a good return loss of -10 dB, and a 66.6% impedance bandwidth (2.8 GHz-5.6 GHz), the gain varies between 3.1 dBi and 4.5 dBi.