Analysis for unloaded quality factor of a rectangular double-reentrant cavity with circular cylindrical ferrule for klystron using Wheeler’s incremental inductance rule

ABSTRACT

Closed-form formulation for the estimation of equivalent circuit capacitance and inductance of a rectangular double-reentrant klystron cavity with circular cylindrical ferrules was developed and used for arriving at the resonant frequency of the cavity. The closed-form expression for the cavity inductance and resonant frequency were subsequently used for estimating unloaded quality factor of the cavity using Wheeler’s incremental inductance rule. The proposed analysis was validated against 3D electromagnetic analysis and measurements for a typical rectangular klystron cavity operating in C-X-bands.

KEYWORDS:

• Klystron
• multiple beam klystron
• quality factor
• reentrant cavity
• Wheeler’s incremental inductance rule

ORCID

Ashok Bansiwal http://orcid.org/0000-0002-2226-9364

K. J. Vinoy http://orcid.org/0000-0003-0677-2901

Subrata Kumar Datta http://orcid.org/0000-0001-6618-7232

Additional information

Notes on contributors

Ashok Bansiwal

Ashok Bansiwal received his BE degree in Electronics engineering from Engineering college, Kota, India in 1999 and MTech degree in Electronics and communication with specialization in Microwaves from Indian Institute of Technology, Roorkee, India in 2001. He has been working as a scientist at Microwave Tube Research and Development Centre (MTRDC), DRDO, India since 2001. Presently, he is pursuing PhD from Indian Institute of Science (IISc), Bangalore, India and his area of research are circuit analysis of cavity interaction structure, coupling circuits and large-signal analysis of Klystrons.

Sushil Raina

Sushil Raina received his BSc (H) Physics, MSc (Physics) and MTech (Microwave electronics) from University of Delhi, India in 1989, 1991 and 1993, respectively. He joined Microwave Tube Research and Development Centre (MTRDC), DRDO, India in 1993 and since then he has been working towards the research and development of various microwave tubes.

K. J. Vinoy

K. J. Vinoy received the bachelor’s degree from the University of Kerala, India, master’s degree from the Cochin University of Science and Technology, India, and PhD degree from the Pennsylvania State University, USA, in 1990, 1993, and 2002, respectively. He is currently working as a professor in the Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India.

Subrata Kumar Datta

Subrata Kumar Datta received the BE degree in Electronics and Telecommunications Engineering from Bengal Engineering College, Calcutta University, Kolkata, India, in 1989 and the MTech and PhD degrees in Microwave Engineering from the Institute of Technology, Banaras Hindu University, Varanasi, India, in 1991 and 1999, respectively. Since 1991, he has been a Scientist with the Microwave Tube Research and Development Centre, Defence Research and Development Organisation, Bengaluru, India.