Asian Journal of Physics Vol. 34, Nos 9 & 10 (2025) 649-658

Design and development of a 6 MW peak and 15 kW average power 4-port circulator for S-band klystron

Narugopal Nayek1, Sandeep Vyas1, Kangkan Kalita1, Ganesh Gaikwad2, Jitendra Kumar1, Sandeep Kakatkar2 and Sharad Chavan1,2
1SAMEER Centre for High Power Microwave Tube and Component Technology, IIT Guwahati, Guwahati-781 039, Assam, India

2SAMEER, IIT Powai, Mumbai-400 076, India

This paper focuses on designing and optimizing a 7 MW peak and 15 kW average powers 4-port differential phase shift circulator for an S-band Klystron operating at 2.998 GHz. The three key aspects, such as, electrical design, thermal design and magnetic circuit design are described in the paper. Parametric simulation and optimization are adopted to arrive at final dimensions of the device. The S-parameters obtained in the study revealed return loss, insertion loss and isolation to be 33.4dB, 0.19dB, and 31dB, respectively. The estimated 20-dB return loss bandwidth is around 40 MHz. Thermal analysis is performed to predict steady state temperature distribution in the device under various conditions of thermal loading and heat dissipation. In the magneto-static analysis, eight numbers of bar type magnets are used to provide DC magnetic biasing to the ferrites. The yoke cover is used to increase the magnetic field in the intended region and also to prevent the leakage of magnetic field. The spacing between ferrite and magnets has been optimized based on the simulation studies. A uniform magnetic biasing has been ensured through magnetic analysis. © Anita Publications. All rights reserved.
Doi: XXX
Keywords: Non-reciprocal devices, Circulator, High power microwave, Simulation.

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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