Slot Antenna Miniaturization Using Folded Slot for ISM Band Applications

Abstract

A novel antenna miniaturization technique of microstrip-fed slot antenna, using a folded slot topology, is highlighted. Antennas are designed with slits on both sides of folded slot and metallic strips on the bottom of the substrate. An unfolded radiating slot of 30.00 mm length is folded to 15.44 mm, without compromising the radiation pattern or return loss characteristics. The proposed antenna exhibits 60.27% reduction in resonant frequency for slits and strips’ loaded folded slot topology in comparison with 48.01% reduction in resonant frequency of previous works. These antennas also offer improved impedance bandwidth. The gain performances of these antennas are improved by placing a dielectric slab on the bottom of the substrate without compromising the radiation pattern characteristics.

Keywords:

• Folded slot
• Metallic strip
• Microstrip
• Miniaturized
• Slit
• Unfolded slot

Acknowledgement

The authors would like to thank the Aliah University and IIT Kharagpur for their help.

Additional information

Notes on contributors

Hashibul Alam

Hashibul Alam was born in the district of Nadia, State of West Bengal, India. He received his BSc in electronics from Calcutta University, Kolkata in 2005, MSc in electronics from West Bengal State University, Kolkata in 2010, and MTech in electronics and communication engineering from West Bengal University of Technology, Kolkata in 2013. He is currently pursuing PhD from Aliah University and has also been working as technical assistant (grade-I) in the Department of Electronics and Communication Engineering, Aliah University, Kolkata, India since 2016. From 2005 to 2009 he worked as a technician, from 2010 to 2011 he worked as a part-time faculty and from 2012 to 2016 he worked as a guest lecturer. His research area includes the design of application-based miniaturized and electrically small antennas.

SK. Moinul Haque

S K Moinul Haque was born in the district of Birbhum, State of West Bengal, India, on May 20, 1981. He received the BE degree in electronics and communication engineering from the University of Burdwan, West Bengal in 2003 and the MTech degree in RF and microwave engineering, (Department of Electronics and Electrical Communication Engineering) from IIT, Kharagpur in 2009 and PhD degree from the same department at IIT, Kharagpur in 2014. His research areas are conformal antennas, antenna miniaturization and electrically small antennas. He is currently working as an associate professor in the Department of Electronics and Communication Engineering, Aliah University, Kolkata, India. He published papers in IEEE Transaction on Antennas and Propagation, IEEE AWPL, IET Microwaves, Antennas and Propagation. He is also the reviewer of IEEE Transactions on Antennas and Propagation, IET Microwaves, Antennas and Propagation, Wiley International Journal of RF and microwave Computer-Aided Engineering. He is also an associate regional editor of Advanced Electromagnetic journal. Email: [email protected]