[1] Govt Engn Coll, Dept ECE, Barton Hill, Thiruvananthapuram 695035, Kerala, India
[2] Coll Engn, Thiruvananthapuram, Kerala, India
[3] APJ Abdul Kalam Technol Univ, Thiruvananthapuram 695016, Kerala, India
[4] Chettinad Coll Engn & Technol, Dept Phys, Karur 639114, Tamil Nadu, India
[5] PKR Arts Coll Women, Dept Phys, Gobichettipalayam, Tamil Nadu, India