A Delay Line Microwave Notch Filter that Suppresses Interference

Abstract

In this paper, we present the theory and design of a tunable microwave notch filter using a simple waveguide line whose length can be varied by varying the position of a sliding short. The notch filter has been implemented at a frequency of 9.34 GHz. Theory has been developed which indicates that the monotone interference accompanying the microwave AM signal can be completely suppressed at the output of the notch filter. The effect of additive white Gaussian noise (AWGN) accompanying the microwave AM signal has also been calculated.

Indexing terms:

• Microwaves
• Notch filter
• Delay line
• AWGN
• Interference

Additional information

Notes on contributors

Sudipta Chattopadhyay

Sudipta Chattopadhyay received his BSc (Honours) in Physics from the University of Burdwan, West Bengal in 1997. He received his MSc degree in Physics from the Visva-Bharati University, Santiniketan, West Bengal in 2000. He has been working for PhD degree in the Department of Physics of Visva-Bharati University since July 2002. His principal field of research interest is microwave communication. He has published many papers in national journals and in national and international conferences.

Taraprasad Chattopadhyay

Taraprasad Chattopadhyay secured ranks within the first ten in all examinations he has ever passed. He received his PhD degree from the University of Burdwan, West Bengal, in January, 1998. Presently, he is Professor in Department of Physics in Visva-Bharati University. He carried out research work in Koyto University, Japan, in 1988–89 in optical communication. In 1991–92, he was an invited researcher of the Japan Research Development Corporation when he carried out research on the design of high-frequency light modulator. He has published 70 papers in national and international referred Journals and in national and international conferences. He was a reviewer of international journals like Electronics Letters and Proceedings of the IEEE (part-H). He has been selected a reviewer of IEEE (USA) Laser and Electrooptic Society Journals. His field of research interest is microwave and optical communications. He is a member of IEEE (USA), LEOS Society and of IETE.