Jinjun Feng

Design investigation of 10W W-band folded waveguide TWT

A design of CW 10 W W-band folded waveguide TWT is investigated and the designed electron optics, interaction section and coupling system are described. Finally the simulation results show that the design can reach the required 10 W power output.

Performance enhancement of W-band CW TWT

Backward wave oscillation (BWO) and other parasitic oscillation are encountered in the process of manufacturing W-band TWT. In order to eliminate the oscillation, a kind of attenuation material is coated to the folded waveguide wall. This method presents a good performance to enable stable working of the TWT and increase the output power to 15W at the same drive level.

20.4: Progress of W-band 10W CW TWT

This paper gives the recent progress of a W-band 10W CW TWT, describes the basic design and test results. The prototype has a 10W output power with 2GHz bandwidth.

Analysis and Test Preparation of Attenuator for W-band Folded Waveguide TWT

Attenuator has been designed to meet the strict requirements in W-band for folded waveguide TWT. Synthetical analysis of parameters is carried out, and using microwave studio simulation results show design has good performances. Fabrication technology and test system are in progress to develop the practical attenuator.

Attenuator for W-band folded waveguide TWT

Attenuators for W-band folded waveguide TWT have been successfully fabricated using BeO and Al2O3 respectively. And these samples could meet the strict dimension requirements based on former design after repetitious attempts. Test system of attenuator was developed to test them, and test results showed good performance that can meet the practical requirements in W-band folded waveguide TWT.

A broadband microwave window for W-band TWT

A kind of broadband microwave window for W-band TWT is manufactured. The measurement result reveals that the pass bandwidth is more than 10 GHz in W-band which has met the requirements of the TWT.

15.2: Investigation of THz regenerative oscillator

THz regenerative oscillator by combining folded waveguide TWT with delayed feedback leg was investigated, which included preliminary design and 3D beam/wave simulation to lay a foundation for research and development of THz regenerative oscillator.

Investigation of high frequency vacuum devices using micro-fabrication

Investigation of high frequency vacuum devices using microfabrication is reported. TWT and BWO design and simulation is discussed. Design is based on theoretical analysis and equivalent circuit method.

Simulation of FWG TWT Attenuator Using Microwave Studio and MAFIA

An attenuator structure for FWGTWT was designed and optimized for a good match to the folded waveguide circuit, SII<-20 dB from 90 GHz to 98 GHz for single port system. The equivalent relationship between dielectric loss and conductivity loss was described and discussed in this paper, in order to load the attenuators in beam/wave interaction simulation using MAFIA.

3D simulation of electron gun and beam transport for W-band TWT

This paper described the 3D simulation method and results of electron gun and beam transport for a W-band TWT with MAFIA simulation code.