TY - JOUR

T1 - Sensitivity analysis of a double corrugated waveguide slow wave structure for a 151 - 161.5 GHz TWT

AU - Mahadev Rao, Jeevan

AU - Basu, Rupa

AU - Letizia, Rosa

AU - Paoloni, Claudio

PY - 2024/1/29

Y1 - 2024/1/29

N2 - TWTs at D-band (141 – 174.5 GHz) are the most promising solution to provide high transmission power for enablinglong range wireless links with high capacity at sub-THz frequency. A D-band TWT was designed in the 151-161.5 GHzfrequency band with about 10 W output power. The double corrugated waveguide is adopted as slow wave structure (SWS)for the relatively easy fabrication and alignment in comparison to other SWSs typically used at sub-THz frequency. Dueto the short wavelength at D-band, the fabrication requires high precision computerised numerically controlled (CNC)milling machining and tight tolerance control. The sensitivity analysis of performance as a function of the dimensionsof a device is an important method to predict in advance how the performance of the device is affected by geometryvariations, and also to ascertain the required level of fabrication accuracy to meet the specifications. The sensitivityanalysis is also useful to define the best initial dimensions for further optimization. This paper discusses the sensitivityanalysis applied to the double corrugated waveguide (DCW) to be used in a 151-161.5 GHz TWT. A broad range ofparameters are considered demonstrating the importance of fabrication accuracy and the eventual correction optionsfor a correct functioning. The impact of fillets in the DCW pillars is also evaluated to eventually ease the fabricationrequirement.

AB - TWTs at D-band (141 – 174.5 GHz) are the most promising solution to provide high transmission power for enablinglong range wireless links with high capacity at sub-THz frequency. A D-band TWT was designed in the 151-161.5 GHzfrequency band with about 10 W output power. The double corrugated waveguide is adopted as slow wave structure (SWS)for the relatively easy fabrication and alignment in comparison to other SWSs typically used at sub-THz frequency. Dueto the short wavelength at D-band, the fabrication requires high precision computerised numerically controlled (CNC)milling machining and tight tolerance control. The sensitivity analysis of performance as a function of the dimensionsof a device is an important method to predict in advance how the performance of the device is affected by geometryvariations, and also to ascertain the required level of fabrication accuracy to meet the specifications. The sensitivityanalysis is also useful to define the best initial dimensions for further optimization. This paper discusses the sensitivityanalysis applied to the double corrugated waveguide (DCW) to be used in a 151-161.5 GHz TWT. A broad range ofparameters are considered demonstrating the importance of fabrication accuracy and the eventual correction optionsfor a correct functioning. The impact of fillets in the DCW pillars is also evaluated to eventually ease the fabricationrequirement.

M3 - Journal article

VL - 32

SP - 559

EP - 571

JO - Asian Journal of Physics

JF - Asian Journal of Physics

SN - 0971-3093

IS - 9-12

ER -