Rajesh Khanna

Work place: Department of Electronics and Communication Engineering Thapar University, Patiala, 147004, Punjab, India

E-mail: rkhanna@thapar.edu


Research Interests: Wireless Networks, Wireless Communication, Antenna Technology


Dr. Rajesh Khanna received his B.Sc. (Eng.) Degree in Electronics and Communication in 1988 from the Regional Engineering College, Kurukshetra, Haryana, India and M.E. degree in 1998 from Indian Institute of Sciences, Bangalore, India. Presently he is working as a Professor, Department of Electronics and Communication, Thapar University, Patiala, Punjab, India. He has published 80 papers in national and international journals/conferences. He has research projects worth Rs 1.5 crore to his credit. His research interest includes the analysis and design of antennas, wireless communication, MIMO, and fractional Fourier transformbased wireless systems.

Author Articles
Performance Improvement of U-Slot Microstrip Patch Antenna for RF Portable Devices using Electromagnetic Band Gap and Defected Ground Structure

By Nitika Mittal Rajesh Khanna Jaswinder Kaur

DOI: https://doi.org/10.5815/ijwmt.2016.03.03, Pub. Date: 8 May 2016

This paper presents a microstrip patch antenna incorporated with electromagnetic band gap (EBG) structure on substrate and defected ground structure (DGS) in the ground plane. Electromagnetic Band Gap materials are artificially engineered structures that improve the performance of the patch antennas. It is manifested that applications of both EBG and DGS outcomes in the remarkable improvement of return loss level from -20.2dB to -31.5dB and bandwidth from 155MHz to 202 MHz respectively. The most fascinating characteristic of the proposal is the capability of increasing the gain, directivity and the total efficiency of the antenna without affecting the other essential parameter like bandwidth which makes the designed antenna applicable for Radio Frequency portable devices operating at 6.1 GHz. 

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Available Link Bandwidth Based Network Selection in Multi-access Networks

By Kiran Ahuja Brahmjit Singh Rajesh Khanna

DOI: https://doi.org/10.5815/ijisa.2014.03.08, Pub. Date: 8 Feb. 2014

In a heterogeneous wireless environment, one of the important aspects of seamless communication for ubiquitous computing is the dynamic selection of the best access network. The problem of access network selection has been addressed through various decision methods based on available network information. Available link bandwidth is one of the important information parameters, which can be used as criterion for network selection. In this paper, we consider available bandwidth as a dynamic parameter to select the network in heterogeneous environment. First, we propose a bootstrap approximation based technique to estimate available bandwidth and then utilize it for the selection of the best suitable network in the heterogeneous environment consisting of 2G and 3G standards based wireless networks. The proposed algorithm is implemented in temporal and spatial domains to check its robustness. Estimation time with varying size of files is used as the performance metric. Through numerical results, it is shown that the proposed algorithm gives improved performance as compared to the existing algorithm.

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