Enhanced isolation with defected ground structure in MIMO antenna. Issue 24 (1st November 2014)

• Record Type: Journal Article
• Authors: Anitha, R.; Sarin, V.P.; Mohanan, P.; Vasudevan, K.
• Is Part Of: Electronics letters. Volume 50:Issue 24(2014)
• Page Start: 1784
• Page End: 1786
• Publication Date: 2014-11-01
• Subjects: microstrip antenna arrays -- defected ground structures -- polarisation; defected ground structure -- multiple‐input–multiple‐output antenna -- MIMO antenna -- surface waves -- dielectric substrate -- mutual coupling -- square ring patch antenna -- 4‐port antenna -- cross‐polarisation; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.2795
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A defected ground structure (DGS) for improving isolation between four ports in a collocated multiple‐input–multiple‐output (MIMO) antenna is proposed. Isolation improvement by 7 dB is achieved by reducing surface waves within the dielectric substrate. Mutual coupling values as low as −25 dB are obtained along both the E ‐ and H ‐planes. The MIMO antenna includes a square patch antenna surrounded by a square ring patch antenna with the DGS etched in the form of a square ring. The DGS effectively suppresses the cross‐polarisation levels for all radiating modes. The design and effectiveness of the DGS in improving isolation for a fabricated 4‐port antenna are discussed.