Circular Patch Antenna with Defected Ground for UWB Communication with WLAN Band Rejection

K. G. Jangid; Ajay Tiwari; Vijay Sharma; V.S. Kulhar; V.K. Saxena; D. Bhatnagar

doi:10.14429/dsj.66.9329

K. G. Jangid Department of Physics, Manipal University, Jaipur
Ajay Tiwari Microwave Lab, Department of Physics, University of Rajasthan, Jaipur
Vijay Sharma Govt. Mahila Engineering College, Ajmer
V.S. Kulhar Department of Physics, Manipal University, Jaipur
V.K. Saxena Microwave Lab, Department of Physics, University of Rajasthan, Jaipur
D. Bhatnagar Microwave Lab, Department of Physics, University of Rajasthan, Jaipur

DOI: https://doi.org/10.14429/dsj.66.9329

Keywords: Ultra wideband communication systems, coplanar waveguide feed, defected ground structure, frequency band notch characteristics

Abstract

The design and performance of coplanar waveguide fed modified circular patch antenna for possible application in ultra wideband communication systems with band rejection for upper wireless local area network band (5.15 GHz - 5.85 GHz) is reported. This antenna is designed on glass epoxy FR4 substrate having size 30 mm × 20 mm × 1.59 mm. The coplanar waveguide fed circular patch antenna is modified by introducing L shaped slits in ground plane and U shaped slot in patch and performance analysis of antenna is simulated by applying CST microwave studio simulation software. Different designed antennas were tested with available experimental facilities. The developed end product shows a nice matching with feed network at frequencies 2.62 GHz, 3.94 GHz and 8.50 GHz and provides 10.38 GHz (3.33 GHz - 13.71 GHz) impedance bandwidth with wireless local area network 5.5 GHz (4.74 GHz - 6.15 GHz) band rejection. The co and cross polar patterns in elevation and azimuth planes at two frequencies namely 2.62 GHz and 3.94 GHz are obtained which dictate that co-polar patterns are significantly better than cross polar patterns. The simulated peak gain of antenna is close to 3.86 dBi and gain variation with frequency shows a sharp gain decrease in the frequency range 4.74 GHz to 6.15 GHz.

Author Biographies

K. G. Jangid, Department of Physics, Manipal University, Jaipur

Mr K.G. Jangid has received MSc (Physics) from University of Rajasthan, Jaipur, in 2003 and currently pursuing for his PhD degree from Manipal University, Jaipur, India. His research interests include antenna miniaturization, monopole antennas, UWB antennas, slot antennas, circular polarization antennas, mobile phone and wireless local-area network antennas. Presently he is working on UWB antenna and slot antennas and improvement of gain of antennas using reflector.

Ajay Tiwari, Microwave Lab, Department of Physics, University of Rajasthan, Jaipur

Mr Ajay Tiwari received MTech (Comm. and Info. Tech.) from University of Rajasthan, in 2012. He is working as a Research Assistant in a DEIT, New Delhi supported project. His research interests are reconfigurable antennas, UWB antennas, wearable and flexible antennas and slot antennas. Currently he is working on reconfigurable antennas.

Vijay Sharma, Govt. Mahila Engineering College, Ajmer

Dr Vijay Sharma received his MSc in 2002 and PhD in Physics in 2011. He is working as an Assistant Professor in the Govt. Mahila Engineering College, Ajmer. His research interest includes : Design and development of broadband dual frequency antenna, circularly polarised antenna for different communication systems. Currently he is working on high gain DGS antenna.

V.S. Kulhar, Department of Physics, Manipal University, Jaipur

Dr Vijendra Singh Kulhar received his MSc and PhD in Physics from Birla Institute of Technology & Science, Pilani. He is currently working as a Professor in Department of Physics, Manipal University, Jaipur, India. His areas of interest are : Planar antennas for wireless communication systems, scattering theory, atomic physics.

V.K. Saxena, Microwave Lab, Department of Physics, University of Rajasthan, Jaipur

Dr V.K. Saxena received his MSc and Ph.D in Physics from University of Rajasthan, Jaipur, India in 1984 and 1990, respectively. He is currently an Associate Professor, Department of Physics, University of Rajasthan, Jaipur, India. His areas of interest are planar antennas for modern communication systems and dielectric relaxation properties compounds at microwave frequencies.

D. Bhatnagar, Microwave Lab, Department of Physics, University of Rajasthan, Jaipur

Dr Deepak Bhatnagar received his MSc and PhD in Physics from University of Rajasthan, Jaipur, India in 1981 and 1986, respectively. He is currently working as a Professor in Department of Physics, University of Rajasthan, Jaipur, India. His other areas of interest are : Dielectric relaxation properties compounds at microwave frequencies and conducting polymers.