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.
Abstract
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.
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