Electrically Small Patch Antenna Loaded with Metamaterial

Abstract

In this paper, the authors present a new planar metamaterial loaded electrically small microstrip patch antenna. The rectangular microstrip patch antenna is loaded by metamaterial using planar square spilt ring resonators (SRRs). The unloaded rectangular microstrip patch antenna resonates at 23 GHz, whereas after loading it by metamaterial, the same antenna resonates at 9.51 GHz. In loaded condition, the resonant frequency of rectangular microstrip patch antenna reduces due to magnetic coupling. The dimensions of the antenna structure are 0.161λ × 0.192λ. Using the Chu limit, the size of the antenna comes to ka = 0.775, thus, satisfies the condition of an electrically small antenna (ka < 1). The antenna exhibits an impedance bandwidth of 512 MHz at a resonant frequency of 9.51 GHz. The calculated radiation Q _rad is 18.86 which is larger than Q_chu minimum, that is Q_chu, = 3.43. The gain and directivity of this antenna structure are 3.2 dBi and 7.8 dBi, respectively. The proposed antenna structure is simulated on a dielectric substrate with coaxial fed without incorporating any additional matching network.

Keywords:

• Chu limit
• Electrically small antennas
• Magnetic coupling
• Negative permeability
• Planar metamaterial
• Q-factor

Additional information

Notes on contributors

J. G. Joshi

J. G. Joshi received B.E. in Electronics & Telecommunication Engineering from Amravati University, Amravati, M. S. (Electronics & Control) from Birla Institute of Technology and Science, Pilani (Raj.), India in 1994 and 1996 respectively. Since 2008 he is pursuing Ph.D. under AICTE- MHRD-Govt. of India sponsored QIP (Poly) scheme at NITTTR, Chandigarh, India, under the guidance of Prof. S.S. Pattnaik and Dr. Swapna Devi. His research interests include Microstrip Patch and Planar Metamaterial antennas. E-mail: [email protected]

Shyam S. Pattnaik

Shyam S. Pattnaik received Ph.D. degree in Engineering from Sambalpur University, India in 1992. Joined as a faculty member in the Dept. of Electronics and Communication Engineering at NERIST, India in the year 1991. He worked in the department of Electrical Engineering, University of Utah, USA under Prof. Om. P. Gandhi. Since 2004, he is working as Professor and Head of Educational Television Center of National Institute of Technical Teachers' Training and Research, Chandigarh. He is a recipient of National Scholarship, BOYSCAST Fellowship, SERC visiting Fellowship, INSA visiting Fellowship, UGC Visiting Fellowship, and Best Paper award etcs. He has been a member of many important committees at national and international level. He is a fellow of IETE, Senior member of IEEE, life member of ISTE and has been listed in the Who's Who in the world. He has 177 technical research papers to his credit. He has conducted number of conferences and seminars. His areas of interest are soft computing, information fusion, and their application to virtual learning, antenna design, metamaterial antennas and video processing. He has produced thirty-three M.Tech. thesis and four Ph. Ds. Eight Ph.D. students and four M.E. Students are presently pursuing their thesis under the guidance of Prof. (Dr.) S.S. Pattnaik. E-mail: [email protected]

Swapna Devi

Swapna Devi received Ph.D in Engineering from Tezpur University in the year 2008. M.E. degree from Regional Engineering College (Presently NIT), Raurkala, Orissa, in 1997. B. Tech degree in Electronics and Communication Engineering from NERIST, Arunachal Pradesh, in 1994. In 1997, she joined the Deptt. of Radiology, University of Utah as Research Assistant. On returns to India, she joined NERIST, India as a Lecturer in the Deptt. of Electronics and Communication and subsequently in the Deptt. of Computer Science and Engineering in same Institute in 1999. She is an Associate Professor in the Deptt. of Electronics and Communication Engineering at National Institute of Technical Teachers' Training and Research, Chandigarh, India. Her interests include, Medical Image Processing and Soft computing Techniques. She has contributed 130 technical papers in various journals and conference. Dr. Swapna Devi is a life member of ISTE, member of IEEE and IETE. She has completed 03 sponsored projects. E-mail: [email protected]

M. R. Lohokare

M. R. Lohokare received the Bachelor degree in Electronics Engineering from Shivaji University, India in 1993 and M Tech. in Digital Communication, from Barkatullah University, Bhopal, India in 1999. Since 2008 he is pursuing Ph.D. under AICTE- MHRD-Govt. of India, sponsored QIP (Poly) scheme, at NITTTR, Chandigarh, India under the guidance of Prof. S.S. Pattnaik and Dr. Swapna Devi. His research interests include Soft computing, Microstrip antenna, and video processing. E-mail: [email protected]