**Author details**

Sunil Kumar Pradhan<sup>1</sup> \* and Ranjan Barik<sup>2</sup>

\*Address all correspondence to: sunilpradha@gmail.com

1 Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan (ROC)

2 Microwave Tube Division, CSIR-Central Electronics Engineering Research Institute, Pilani, Rajasthan, India
