Decoupling Network Comprising Transmission Lines and Bridge Resistance for Two-Element Array Antenna

Shumo LI  Naoki HONMA  

IEICE TRANSACTIONS on Communications   Vol.E97-B   No.7   pp.1395-1402
Publication Date: 2014/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.1395
Type of Manuscript: PAPER
Category: Antennas and Propagation
decoupling network,  mutual coupling,  transmission lines,  bridge resistance,  array antenna,  

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This paper presents a novel decoupling network consisting of transmission lines and a bridge resistance for a two-element array antenna and evaluates its performance through simulations and measurements. To decouple the antennas, the phase of the mutual admittance between the antenna ports is rotated by using the transmission lines, and a pure resistance working as a bridge resistance is inserted between the two antenna ports to cancel the mutual coupling. The simulation results indicate that the proposed decoupling network can provide a wider bandwidth than the conventional approach. The proposed decoupling network is implemented and tested as a demonstration to confirm its performance. The measurement results indicate that the mutual coupling between the two antenna ports is lowered by about 47dB at the resonant frequency.