Mutual coupling reduction between closely spaced microstrip antennas by means of H-shaped conducting wall

• Published in: Electronics letters Vol. 52; no. 13; pp. 1093 - 1094
• Main Authors: Park, C.-H, Son, H.-W
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 23.06.2016
• Subjects: Antennas; Antennas and propagation; Conduction; defected ground structures; dielectric substrate; Electronics; frequency 5.2 GHz; Ground plane; H‐shaped conducting wall; H‐shaped copper strip; Microstrip antennas; Mutual coupling; mutual coupling reduction; resonators; Strip; Walls; H-shaped copper strip; defected ground structures; dielectric substrate; mutual coupling reduction; microstrip antennas; frequency 5.2 GHz; resonators; H-shaped conducting wall
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2016.1339

This Letter presents a novel H-shaped conducting wall structure that effectively suppresses the mutual coupling between two closely spaced microstrip antennas (MSAs). The wall consists of an H-shaped copper strip printed on a dielectric substrate, and a row of periodic vias through which the strip is connected to a ground plane. The wall is inserted between the MSAs and surrounds half the periphery of each antenna. Measurements of a prototype show that the high isolation of about 51 dB is achieved between two MSAs separated by the edge-to-edge distance of 0.052 λ0 at 5.2 GHz. The proposed structure greatly improves the isolation without causing any significant degradation of the antenna bandwidth, gain, or front-to-back ratio, unlike other isolation structures based on resonators or defected ground structures.