Equivalent circuit approach for the design of hole and slot bare anode block of magnetron

Abstract

Magnetron is a high-power microwave source with high demand among vacuum devices. Before the design, validating it with other methods gives confidence to the designer. An equivalent circuit analysis is developed for a 16 vanes hole and slot structure yielding the design parameters, hole radius, slot length, slot width, and anode height. This method is adopted to calculate the cavity resonant frequencies preferable over the field equations, simulation, and fabrication. From inductance and capacitance definition, dispersion equation of the anode block is derived for each mode. The equivalent circuit approach is validated with the simulation to verify consistency. The resonant frequency relative difference of these two methods is 1.46%. The inductance and capacitance changes are observed by parametric variation of these structure dimensions. Strapping causes the frequency shift from 3.1685 to 2.217 GHz, and change in the cavity resonant frequency with the strap depth and strap height are plotted.

KEYWORDS:

• Anode
• equivalent circuit method
• hole and slot resonant cavities
• magnetron
• resonant frequency

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Patibandla Anilkumar

Patibandla Anilkumar received his M. Tech degree in High Voltage Engineering from University College of Engineering, JNTUK, Kakinada, Andhra Pradesh, India, in 2018. He is currently pursuing a Ph.D. degree with the Center for Nanotechnology, IIT Guwahati, Guwahati, Assam, India. His research interests include the Development of high-power microwave devices, Pulse Magnetrons, electromagnetics, Microwave Engineering.

Dobbidi Pamu

Dobbidi Pamu received in Ph. D in Physics, from School of Physics from University of Hyderabad, India. He is currently working as an Associate Professor in Physics, Indian Institute of Technology Guwahati, Guwahati. His research interests are to develop high-k and low-loss ceramics for microwave applications. Also, he works on the bulk and thin films of ferroelectric, piezoelectric, bio, and magnetic ceramics for sensor, energy harvesting, electronic, biosensors, and for high-power microwave devices.

Tapeshwar Tiwari

Tapeshwar Tiwari received the Ph.D. degree in microwave tube from the Center of Research in Microwave Tube (CRMT), Department of Electronics Engineering, IIT BHU, Varanasi, India. He was a Scientist with the Society for Applied Microwave Electronics Engineering and Research (SAMEER), Mumbai, India. He was associated with the Research and Development Program, CRMT. As a Project Manager/Principal Investigator/Co-PI, he has completed many prestigious projects of national interest sponsored by the Defence Research and Development Organisation, the Indian Space Research Organisation, the Board of Research in Nuclear Sciences, and the Department of Science and Technology. As a Project Manager, he was responsible for the successful completion of the first indigenously developed magnetron and klystron-based high-energy linear accelerator systems. As a Management Representative, he was responsible for obtaining ISO 9001:2008 certification of the Medical Electronics Division, SAMEER. He is currently a Program Director of the newly established SAMEER Centre for High-Power Microwave Tube and Component Technology, IIT Guwahati, Guwahati, India, where he is involved in the establishment of various facilities required for the design and development of high-power microwave tube and components. He has authored over 100 research articles in various journals and conference proceedings and over 30 technical reports. He has over 25 years of research and development experience in the area of high-power microwave technology. His current research interests include dielectric antennas, linear accelerator systems, and slow-wave and fast-wave microwave tubes.

Tiwari is a Life Fellow of the Vacuum Electron Devices and Application Society. He has delivered invited talks at various national/international conferences. He has also chaired technical sessions in various national/international conferences. He is a Reviewer of various journals.