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Arc-cornered microstrip antenna with defected ground structure for broad banding and improved cross-polarization suppression over whole skew planes

Published online by Cambridge University Press:  07 December 2015

Subhradeep Chakraborty  and
Sudipta Chattopadhyay
Subhradeep Chakraborty*
Affiliation:
Department of Electronics and Communication Engineering, Siliguri Institute of Technology, P.O. Sukna, Darjeeling, Siliguri 734009, West Bengal, India. Phone: 08967885437
Sudipta Chattopadhyay
Affiliation:
Department of Electronics and Communication Engineering, Siliguri Institute of Technology, P.O. Sukna, Darjeeling, Siliguri 734009, West Bengal, India. Phone: 08967885437
*
Corresponding author: S. Chakraborty Email: [email protected]
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Abstract

Defected ground structure (DGS)-integrated arc-cornered rectangular microstrip antenna (RMA) has been investigated to achieve broadband along with high co-polarized to cross-polarized radiation (CP–XP) isolation over principal as well as over skew planes without affecting the dominant mode co-polarized (CP) radiation pattern. The present arc-cornered RMA on circular and rectangular dot-type DGS is thoroughly studied and compared with the conventional rectangular microstrip antenna. In the present paper, a crucial emphasis is given to improve CP–XP isolation in all the skew planes and by employing circular dot-type DGS around 20 dB CP–XP isolation is achieved over whole skew planes as well as in the H-plane with the proposed structure with 20% impedance bandwidth. On the contrary, the CP–XP isolation and impedance bandwidth vary in opposite manner in case of the rectangular dot-type DGS. Around 25 and 10 dB CP–XP isolation with 9 and 22% impedance bandwidth have been obtained with thin and thick rectangular dot-type DGS, respectively. The corners of the patch surface are rounded in such a way to reduce spurious radiations from the sharp corners, which are generally attributed for high XP radiation along the diagonal directions.

Keywords

Antenna designModeling and measurementsAntennas and propagation for wireless systems
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 2 , March 2017 , pp. 437 - 446
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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