B1. Investigation Design of a High Isolation Closely Spaced Compact CRLH Meta-Material MIMO Antenna

This paper presents a small size metamaterial antenna for MIMO wireless applications. The proposed MIMO antenna consists of two antennas each operates at 5.8GHz. The two antenna elements are designed employing only one composite right/left handed unit cell. The two antenna elements are combined together with small separation between them. The separation between the edges of the two elements has been achieved to be only 0.034 ?0. As a new approach, the reduction of mutual coupling depends on current cancellation between the two antennas without using additional structures. The proposed antenna achieves better than 40dB isolation between the two inputs. In addition to the high isolation between the antenna elements and the small spacing between antenna elements, the proposed antenna has compact size (its size is only 30 X 26 mm2). The design represents size reduction of approximately 65 % compared to conventional patch antennas operating at the same frequency. The antenna is fabricated and measured. A good agreement between simulated and measured results is achieved.

[1]  A.A. Oliner,et al.  A planar negative-refractive-index medium without resonant elements , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[2]  T. Itoh,et al.  Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line , 2004, IEEE Transactions on Antennas and Propagation.

[3]  A. Abdel-Rahman.  COUPLING REDUCTION OF ANTENNA ARRAY ELEMENTS USING SMALL INTERDIGITAL CAPACITOR LOADED SLOTS , 2012 .

[4]  Zhihong Wang,et al.  A compact MIMO antenna for wireless communication , 2008 .

[5]  G. Eleftheriades,et al.  Planar negative refractive index media using periodically L-C loaded transmission lines , 2002 .

[6]  A. A. Mitkees,et al.  Compact and triple band meta-material antenna for all WiMAX applications , 2012, 2012 International Symposium on Antennas and Propagation (ISAP).

[7]  Zhenghe Feng,et al.  A novel compact electromagnetic-bandgap (EBG) structure and its applications for microwave circuits , 2005, IMS 2005.

[8]  Y. Rahmat-Samii,et al.  Microstrip antennas integrated with electromagnetic band-gap (EBG) structures: a low mutual coupling design for array applications , 2003 .

[9]  Zhirun Hu,et al.  Compact novel CPW ferrite coupled line circulator with left-handed power divider/combiner , 2011, 2011 41st European Microwave Conference.

[10]  Zhirun Hu,et al.  A compact dual band meta-material antenna for wireless applications , 2012, 2012 Loughborough Antennas & Propagation Conference (LAPC).

[11]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[12]  N. Alexopoulos,et al.  Scan blindness free phased array design using PBG materials , 2004, IEEE Transactions on Antennas and Propagation.

[13]  Hui Li,et al.  A Compact Planar MIMO Antenna System of Four Elements With Similar Radiation Characteristics and Isolation Structure , 2009, IEEE Antennas and Wireless Propagation Letters.

[14]  Mohammad Naser-Moghadasi,et al.  Compact Size and Dual Band Semicircle Shaped Antenna for MIMO Aplications , 2009 .

[15]  N. Yuan,et al.  Elimination of scan blindness in phased array of microstrip patches using electromagnetic bandgap materials , 2004 .

[16]  Mahmoud A. Abdalla,et al.  Compact half-wavelength metamaterial Stepped Impedance Resonator (SIR) , 2011, 2011 IEEE International Symposium on Antennas and Propagation (APSURSI).