1. Department of Electronics & Communication Engineering, Swarnandhra College of Engineering and Technology, Seetharamapuram, Narsapur, A.P. 534280, India
2. Department of ECE, Koneru Lakshmaiah Education Foundation, Greenfields, Vaddeswaram, Guntur, A.P. 522502, India
3. Department of Nanotechnology, Swarnandhra College of Engineering and Technology, Seetharamapuram, Narsapur, A.P. 534280, India
4. Interdisciplinary Research Center, RV College of Engineering, Mysore Road, Bangalore, K.A. 560059, India