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Mutual Coupling Reduction of Dielectric Resonator Antennas by Metamaterial Inspired Diverter Elements

Mutual coupling (MC) of dielectric resonator antennas is investigated and decoupling is accomplished by metamaterial inspired diverter elements. The diverter elements consist of unit cells of metallic crosses surrounded by four L-shaped copper strips each, printed on both sides of a substrate. A one-unit cell diverter element brings about 3.8 dB reduction in MC and a 2-by-2 unit cell diverter element reduces MC by 3 dB at 25.4 GHz.