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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.
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.
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.
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