Coplanar Waveguide-fed Electrically Small via-less Antenna for Dual Band Applications

Abstract

In this paper, a simple coplanar waveguide fed compact electrically small antenna for dual-band operations without the use of via is presented. The resonances of the structure are obtained by spiraling one of the ground planes of an open-ended CPW transmission line with a short length center feed. The proposed antenna has a geometrical dimension of 0.079λ₀₁ × 0.079λ₀₁ mm² (λ₀₁ is the free space wavelength of first resonant frequency) with a small electrical size (ka) of 0.35. The experimental studies on the fabricated prototype of the proposed antenna show a 2:1 VSWR bandwidth up to 2.53% and 4.12% for 2.3 and 5.3 GHz, respectively. The simulated antenna reflection and radiation characteristics are demonstrated with physical measurements.

Keywords:

• Chu limit
• Coplanar waveguide (CPW)
• Dual-band
• Electrically small antenna (ESA)
• Q-factor

ACKNOWLEDGEMENT

The authors acknowledge the Kerala State Council for Science, Technology and Environment (KSCSTE), Government of Kerala, India and the Council of Scientific and Industrial Research (CSIR), New Delhi, Government of India for providing financial assistance.

Additional information

Notes on contributors

Vivek Rajan

Vivek Rajan received his BSc degree in electronics and MSc degree in electronics with second rank from University of Calicut, India, in 2008 and 2010, respectively. He worked as a senior research fellow in Council of Scientific and Industrial Research (CSIR), Government of India funded project at Centre for Research in Electromagnetics and Antennas, Cochin University of Science and Technology, Kerala. Currently, he is pursuing the PhD degree from Department of Electronics, Cochin University of Science and Technology (CUSAT), India. His current research interests include designing of multiband antenna, electrically small antennas, CPW fed antennas, chipless RFIDs, MIMO antennas, metaresonators and UWB antennas.

Prakash Karavilavadakkethil C.

Prakash Karavilavadakkethil C passed MSc Degree in electronics science from Cochin University of Science and Technology, Kerala, India, in 1993, with third rank. He has got 26 years of teaching experience in electronics and currently associate professor Sree Ayyappa College, Eramallikkara; a Kerala Govt Aided college affiliated to the University of Kerala. He is a Member of IEEE, APS Society and a Fellow Member of IETE. He has completed his Ph.D work in the area of design and development of various circularly polarised antennas. His research interest includes design and development of UWB CP antennas, power harvesting and RF fields. He has twenty-five research publications in international journals and conferences. E-mail: [email protected]

Vinesh Puthiyapurayil V.

Vinesh Puthiyapurayil V received the BSc degree in electronics from the University of Kannur, India, and the MSc degree in electronics from the MES College Erumely, Kottayam, India, in 2004 and 2006, respectively. He is currently working toward the PhD degree at Cochin University of Science and Technology (CUSAT), Kochi, India. His research interests include designing planar inverted F antennas, loop antennas, multi-band antennas, etc. E-mail: [email protected]

Mohanan Pezholil

Mohanan Pezholil received the PhD degree in microwave antennas from Cochin University of Science and Technology (CUSAT), Kochi, India, in 1985. Currently, he is working as a coordinator, Advanced Centre for Atmospheric Radar Research, CUSAT. He worked as an engineer with the Antenna Research and Development Laboratory, Bharat Electronics, Ghaziabad, India. He worked as a professor with the Department of Electronics, CUSAT. He has authored more than 250 referred journal articles and numerous conference articles. He also holds several patents in the areas of antennas and material science. His research interests include microstrip antennas, ultra-wideband antennas dielectric resonator antennas, superconducting microwave antennas, reduction of radar cross-sections, chipless RFID, dielectric diplexer, and polarization agile antennas, Dr Mohanan was the recipient of Dr S Vasudev Award 2011 from Kerala State Council for Science, Technology and Environment Government of Kerala, in 2012, and Career Award from the University Grants Commission in Engineering and Technology, Government of India, in 1994. He is a Senior Member of IEEE. E-mail: [email protected]

Vasudevan Kesavath

Vasudevan Kesavath took PhD in 1982 in microwave antennas and joined as lecturer in Cochin University of Science and Technology in 1985. He is a professor in this University since 1995. He was head of Department of Electronics from 2004 to 2010 and dean, faculty of Technology during 2010 to 2013. Currently, he is a CSIR Emeritus scientist in Cochin University. He has more than 250 publications in international journals and conference proceedings and has more than 2400 citations and an h- index of 27. He has been an investigator for about 20 major projects from various agencies having a total outlay of 31 crores of rupees. He has chaired and presented papers in several IEEE international conferences abroad. He is a Senior Member of IEEE and Fellow of IETE. E-mail: [email protected]