A Multi-functional Diversity Antenna with High Wideband Isolation

Abstract

A physically small, coplanar waveguide (CPW) fed wideband multi-functional diversity antenna possessing high isolation is suggested in this paper. The numerical investigation depicts that a wide bandwidth ranging from 2.2 GHz–10 GHz is achieved using the intended layout. Owning a large impedance bandwidth, the antenna covers both, 2.4 GHz wireless local area network (WLAN) as well as 3.1-10 GHz ultra-wideband (UWB) spectrum. The proposed antenna exploits fractal star shaped monopoles for providing wideband isolation as well as impedance matching. High isolation (>15 dB) in the proposed diversity system is attained by using two rectangular defects in the shared ground plane and an inverted T-shaped stub. A high isolation of -29.4 dB for the 2.4 GHz (WLAN) band and >15 dB for the UWB band are attained respectively. The numerical analysis of the diversity parameters shows that the envelope correlation coefficient (ECC) is well below the practical verge of 0.5. The maximum realized gain of the proposed antenna is found to be 2.86 dBi. The consistency among distinct numerical outcomes strengthens the candidature of the proposed antenna for multifunction wideband diversity applications.