In this paper, a compact multiple-input-multiple-output (MIMO) antenna for ultra-wideband (UWB)and GSM applications is proposed. The antenna features two identical monopoles placed 0.08λ0distance apart and inhabits70 mm × 60 mm board range. Each monopoleelement comprises of a rectangular arm and two semicircular rings which independently control0.85GHz -1.1GHz and 2.5GHz -14.5GHz bands respectively. Isolation of more than22 dB is achieved by integrating three stubs in the ground plane. The structure exhibits stable gain and radiation patterns. Various performance metrics including envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC) and mean effective gain (MEG) are evaluated which observe the MIMO standards. The proposed structure has a nearly constant group delay over the operating bands.

Ultra-Wideband (UWB), compact antenna, GSM band, high isolation, MIMO antenna.

A compact dual element monopole MIMO antenna offering GSM service band (0.85GHz - 1.1GHz) and UWB (2.5GHz -14.5GHz) arbitrated by |S11| < -10 dB is implemented on a low cost PCB substrate. High isolation of about 22 dB over the operating bands is obtained using unequal length stubs. The proposed low profile antenna with an electrical size of 0.19λo ×0.17λo offers impedance bandwidth of 22.8% and 141% over the dual operating bands.

Anjali A. Chaudhari and Rajiv K. Gupta (2020). Compact MIMO Antenna for UWB Application. International Journal on Emerging Technologies, 11(4): 539–543.