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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 736065, 9 pages
Research Article

Isolation Improvement Technique for Two Closely Spaced Loop Antennas Using MTM Absorber Cells

Department of Electronic Engineering, Kyonggi University, Suwon, Kyonggi-do 443-760, Republic of Korea

Received 19 December 2011; Revised 3 March 2012; Accepted 5 March 2012

Academic Editor: Mandeep Jit Singh

Copyright © 2012 Hongmin Lee and Hyungsup Lee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a new method to improve isolation between two loop antennas with absorber cells exhibiting negative permittivity and permeability at the aimed frequency of 2.54 GHz. The metamaterial (MTM) unit cell was constructed by two open complementary split ring resonator (OCSRR) and a split ring resonator (SRR) arrangement. The proposed antenna structure consists of two loop antennas occupying a space with the dimensions of and three absorber cells. The size of each absorber unit cell is . The isolation of more than 20 dB was achieved with three absorber cells loaded between two loop antennas; interantenna spacing (center to center) is 0.23 at 2.54 GHz. The results show that port-to-port isolation between two antennas can be improved with absorber.