A compact uniplanar ACS fed multi band low cost printed antenna for modern 2.4/3.5/5 GHz applications

A uniplanar compact triple operating band asymmetric coplanar strip (ACS) fed printed antenna loaded with multiple L-shaped branches and the asymmetric rectangular ground plane has been proposed and developed for multiple wideband wireless system applications. The proposed antenna structure has been simulated and printed (single layer) on a 14 mm × 20.5 mm × 1.6 mm size low-cost substrate FR4. In the design, modified L-shaped strips have been chosen to achieve compactness and also used to generate three wideband independent resonant modes that correspond to several communication standards such as WiBro/LTE/Bluetooth/ISM/WLAN/US public safety and WiMAX applications. The proposed ACS fed antenna geometry has been simulated using CST MWS and tested its results experimentally by using Keysight N5222A Microwave Network Analyzer. A detailed analysis of antenna evolution stages and parametric study has been given to show the tuning property of each operating band. The obtained results demonstrate that the developed ACS fed antenna is having −10 dB (reflection coefficient) impedance bandwidth of 200 MHz from 2.3 to 2.5 GHz, 200 MHz from 3.4 to 3.6 and 2.6 GHz from 4.25 to 6.85 GHz. Further, it is tested experimentally for its radiation patterns (co and cross) which indicate the omnidirectional and bidirectional nature in H and E planes respectively.