Investigation of a Sheet Beam RF Structure with Bragg Reflector for W band Amplifier

Stanislaus, RJ and Bera, A and Sharma, RK (2019) Investigation of a Sheet Beam RF Structure with Bragg Reflector for W band Amplifier. In: 20th International Vacuum Electronics Conference (IVEC-2019), April 29-May 1, 2019, Paradise Hotel Busan, South Korea.

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A W Band staggered double vane (SON) loaded travelling wave tube amplifier (TWTA) with two sections separated by a lossy dielectric loaded rectangular wave guide is studied in this paper. The dispersion characteristies and transient analysis of the slow wave structure are analyzed in Computer Simulation Technology Microwave studio (CST MWS) and High Frequency Software Simulator (HFSS). In this amplifier, we propose to use Bragg reflectors on both sides of the slow was structure (SWS), at the windows for the sheet beam at the electron gun and collector ends; this increases the impedance bandwidth of the structure. The attenuator section is comprised of a rectangular wave guide loaded on either side with single lossy dielectric material spanning over 5.5 pitches. The loss profile of the attenuator and loss magnitude is optimized to provide a 20dB loss in separating the input and output sections. A bandwidth of 15GHz ranging from 90-105GHz is obtained through the analysis. In the PIC simulations, a sheet beam of 50mA current is fed with an operating voltage of 18.3kV. The TWTA yields 20dB gain in the 90-lO5GHz range.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Staggered double vane loading, Travelling wave tube amplifier, Slow wave structure, Bragg reflector, and Attenuator.
Subjects: Microwave Tubes > Travelling Wave Tubes
Divisions: Microwave Tubes
Depositing User: Mr. Jitendra Nath Bajpai
Date Deposited: 29 Sep 2021 09:28
Last Modified: 29 Sep 2021 09:28

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