Array-antenna Decoupling Surface for Dual-band Microstrip Antenna Array

A compact Array-antenna Decoupling Surface (ADS) is presented to decouple dual-band microstrip antenna array, working at 4.5GHz and 5.6GHz. Through diffracting part of the radiated waves to cancel the coupled ones, ADS can greatly reduce the mutual coupling of 10dB and 20.4dB at two frequencies between array elements. Besides, the radiation patterns are modified and the gains are improved. With its superior decoupling capability, the structure is of great potential in the application of multi-element arrays and communication systems.