Ultra wideband antennas for high data rate and low mutual coupling using circular reflector

A MIMO (multiple input multiple output) antennas for two different shapes has been designed and studied, different isolation techniques has been analyzed in order to reduce mutual coupling between two elements. Initially, a tiny sized hexagonal shaped patch for wideband operation is designed in two MIMO elements format, a current distribution study has been carried out to reduce mutual coupling. Later on circular patch MIMO of two antenna elements for UWB (Ultra-wideband) application is designed and analyzed. Same structure is suspended to different isolation techniques; a large reduction in radiation interference is seen. An analysis based study on different isolation techniques done in order to get better reduction in mutual coupling, Along with these study necessary parameters for UWB MIMO antenna like Gain variation and correlation coefficient has been presented.

I. Introduction

Now a day's, communication systems mainly asking for high data rate over wide band of frequency, the regulatory authority named federal communication commission (FCC) permitted the ultra-wideband of frequency ranges for short distance and limited spectral power density of −41.3dB. UWB MIMO Antennas plays more important role for short range of communication, such antennas mainly applicable for WPAN, WBAN etc. As soon as MIMO is concerned, more the number of antenna elements more will be the data rate, but at the same time size of the antenna system and inter-element interference are the factors which must not affect severely. Under consideration of UWB MIMO antennas some of the parameters which are necessary to analyze e.g. mutual coupling, Isolation, current distribution, mean effective gain, effective correlation coefficient and Total active reflection coefficient (TARC) etc.