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Compact and Wideband Circularly Polarized Metamaterial Antenna for the 3.5GHz Band Communication

A compact and wideband circularly polarized (CP) microstrip antenna is designed for mobile communication at the 3.5GHz band. The patch is a small square loaded with a new mushroom metamaterial substrate. The CP mode is synthetized from two orthogonal linear polarized (LP) modes with a phase difference of 90 degree, excited by a Wilkinson power divider. Very wideband impedance and axial ratio (AR) bandwidths are achieved in this design. One metamaterial antenna is demonstrated in full simulations that is with a patch length of about 0.19λ0. The 3dB AR bandwidth is from 3.28 to 4.34GHz (27.8%), covering the full N77 band in 5G communications. The peak right-handed CP gain is 4.53dBic.