1. HE04 Mode Exciters With Flat Transmission and High Mode Purity for Confocal Gyro-TWAs.
- Author
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Yao, Yelei, Wang, Jianxun, Liu, Guo, Li, Hao, Jiang, Wei, and Luo, Yong
- Subjects
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EXCITERS (Electric generators) , *BANDWIDTHS , *WAVEGUIDE transitions , *RADIO frequency , *GYROTRONS , *TRAVELING waves (Physics) - Abstract
A new topology to excite the HE04 mode in wide bandwidth for confocal gyro-TWAs is presented. The mode exciter consists of a TE04 mode exciter and a TE04–HE04 transition waveguide section formed by two cascaded one-stage tapers. In addition, the closed-to-open confocal waveguide boundaries are studied. Numerical results show that the port reflection of the whole structure is well below −10 dB over 90–110 GHz; the transmission of HE04 mode is better than −1 dB over 94–107 GHz. Even more important, a maximum transmission variation of less than ±0.15 dB over the 1-dB bandwidth and a mode purity of better than 97.2% over the 3-dB bandwidth are achieved. The mode exciter is compact and easy to be fabricated, which can be applied to cold-test experiments of confocal gyro-amplifiers circuits. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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