A Compact Dual-Mode Metamaterial-Based Loop Antenna for Pattern Diversity

This letter presents a novel design of compact dual-port dual-mode metamaterial-based loop antenna for pattern diversity. The proposed metamaterial-based loop antenna consists of a loop based on periodically loaded capacitive arc strips and two independent ports with feeding networks. Similar to mu-zero resonance (MZR) antennas, the periodically loaded capacitive loop antenna proposed in this letter allows current along the loop to remain in phase and uniform. By making use of a hybrid feed network, the even and odd modes of the proposed metamaterial-based loop antenna are exploited so that its pattern diversity is achieved effectively. The theory of operation and performances of the proposed antenna are demonstrated in both a full-wave simulation and in the experiments.