Microstrip Antenna Array Reducing Mutual Coupling with Split Ring Resonators Branches and Split Ring Resonators Slots

Abstract A compact decoupling microstrip antenna array with high isolation by using two methods, including SRR branches and SRR slots, is proposed, whose adjacent unit’s center-to-center distance is 0.35λ. Parasitic patches and air cavities are introduced to achieve broadband characteristics of antenna elements. Spatial coupling is reduced by loading SRR (Split-ring resonator) branches between two feeding elements. Moreover, surface current coupling on the floor can be blocked by SRR slots etched on the floor. Simulated and measured results reveal that the designed antenna impedance bandwidth covers 6.7GHz ~ 8.7GHz (26%). The isolation within the working frequency band is better than 22dB. The prototype of the proposed antenna is easy to fabricate, which provides a feasible solution for achieving high isolation between multiple antennas in engineering.