Design and simulation of Ka to W band Klystron Harmonic Generator using Core Oscillation Method (COM)

Document Type : Original Article

Authors

1 PhD student, Malek Ashtar University of Technology, Tehran, Iran

2 Assistant Professor, Malek Ashtar University of Technology, Tehran, Iran

3 Associate Professor, Malek Ashtar University of Technology, Tehran, Iran

Abstract

In this article, a harmonic generator based on klystron is presented, whose input signal is in Ka band and its amplified output signal is in W band. Harmonic generator design is based on Ka-band klystron, which reduces the electron beam current density in the interaction region, reduces the cathode density in the electron gun, and reduces the DC magnetic field required for electron beam convergence. Reducing the mentioned parameters reduces the challenges and complications related to the construction and increases the possibility of achieving high powers in the W band. One of the challenges of harmonic generators is their low efficiency, which has been tried to increase the electron efficiency by using the core oscillation method, which is one of the new methods for increasing the efficiency of klystron amplifiers. The designed harmonic generator structure consists of four Ka band cavity and one W band cavities. The design is done using AJDisk software and a indigenous code. The designed structure is simulated using the PIC studio of CST software. RF output power in W band (93.9 GHz frequency) is 6.4 kW with 16% efficiency. The input frequency is in the Ka band (31.3 GHz frequency). The gain of this device, which is equivalent to the ratio of output power to input power, is 53.9 dB. Extended interaction cavities have been used to reduce the voltage on the gap of the output cavity that prevents the RF breakdown.

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Applied Electromagnetics
Volume 12, Issue 1 - Serial Number 28
Spring and Summer
September 2024

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History

  • Receive Date: 08 March 2024
  • Revise Date: 03 June 2024
  • Accept Date: 26 June 2024
  • Publish Date: 22 July 2024

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