Development of W-band Full Bandwidth TE10-TE20 Mode Converter
The next generation of W-band slow wave structure traveling wave tube has driven great demands of waveguide TE10-TEn0 mode converter with high performance of low loss,wide bandwidth,conversion efficiency.In this paper a mode converter of E-plane TE10 to H-plane TE20 working on the full W-band is developed.In order to verify the mode converter performance,a trans-formation structure with high efficiency is also adopted.Firstly,the characteristic of TEn0 mode distribution in the waveguide is an-alyzed.The E-plane power divider,the waveguide twist and the out-of-phase power combiner are proposed and integrated.Second-ly,the overall scheme of such TE10-TE20 mode conversion is optimized.Finally,this structure is integrated with H-plane out-of-phase power combiner to realize the measurement.This W-band module is fabricated based on CNC technology and measured with three ports.The measurement results,which are agree well with the simulation,show that this module has achieved power distribu-tion ratio of-3.2 dB ±0.2 dB,phase difference of 180°±2°,and the return loss is better than-20 dB within the full W-band.The above results verify the high efficiency,low loss,feasibility and robustness of W-band wideband TE10-TE20 mode converter.
万方数据
