Decoupling network comprising transmission lines and bridge resistance for two-element array antenna

In this paper, a novel decoupling network comprising transmission lines and a bridge resistance are presented and its performance is evaluated based on the measurement. To decouple the antennas, the phase of the mutual admittance between the antenna ports is rotated by using the transmission lines, and a bridge resistance is inserted between the two antenna ports to cancel a mutual coupling. A proposed decoupling network is fabricated and tested. The measurement results indicated the proposed decoupling network can provide wider bandwidth compared with the conventional one.