Abstract
A double-ridge-loaded folded waveguide (DRL-FW) travelling wave tube (TWT) based on period-tapered structure is proposed. Through analysing the dispersion characteristics of the DRL-FW slow wave structure (SWS), the physical mechanism of the band-edge oscillation is obtained. Period-tapered SWS is proposed and analysed for verifying the feasibility in suppressing upper-band-edge oscillation and increasing the output power. Then the electromagnetic characteristics and the beam-wave interaction of TWT based on the period-tapered DRL-FW SWS are investigated. The calculation results predict that it potentially could provide continuous wave power over 600W from 29 GHz to 32 GHz without upper-band-edge oscillation. The bandwidth expands from 29-31GHz to 29-32GHz and electron efficiency is increased from more than 8.3% to more than 11%, while the range of operating voltage expands from 22kV-22.5kV to 22kV-24kV. The corresponding saturated gain can reach over 36.8 dB. In addition, we have carried out experimental tests on the transmission characteristics of period-tapered DRL-FW SWS. The cold test results show that the voltage stand-wave ratio (VSWR) is below 1.8 in the range of 29-32GHz. Good transmission characteristics greatly reduce the risk of reflection wave oscillation, thus improving the stability of DRL-FW TWT.
Highlights
In this paper, based on the detailed analysis of double-ridge-loaded folded waveguide (DRL-FW) slow wave structure (SWS), we propose to implement the period tapered method on the whole SWS
To increase the bandwidth of the beam-wave interaction and increase the voltage-adjusting range, periodic tapered method implemented on whole tube is proposed to suppress the upper-band-edge oscillation and to achieve high power output, which is for the first time, to our knowledge, periodic tapered or jumps are used to improve electron efficiency in previous literature
In this paper, based on the detailed analysis of DRL-FW SWS, we propose to implement the period tapered method on the whole slow wave circuit
Summary
In this paper, based on the detailed analysis of DRL-FW SWS, we propose to implement the period tapered method on the whole SWS. In addition to increasing output power and electronic efficiency, period-tapered method is used to suppress upperband-edge oscillation.
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