MIMO antenna with working-frequency-accompanied isolation characteristic

Abstract

A MIMO antenna with working-frequency-accompanied isolation characteristic is proposed. The MIMO antenna consists of two same monopoles which are printed symmetrically. A complementary split ring resonator (CSRR) is etched on the ground between the two monopoles. The CSRR, which is fed by the monopole through a microstrip line, is the main radiator and isolation structure at the same time. The working and isolation frequencies are influenced by the CSRR equally and always coincide with each other. Two prototypes operating around 5.8 GHz were fabricated and measured. The measured results show that both the fabricated antennas are with return loss of less than 20 and mutual coupling of less than -24 dB. The radiation patterns, gains, efficiencies and envelope correlation coefficient (ECC) were also measured and good performances are achieved.