A TE01 mode generator for testing high power transmission devices

• Published in: Review of scientific instruments Vol. 84; no. 11; p. 114702
• Main Authors: Wu, Zewei, Li, Hao, Fu, Hua, Li, Tianming, Xu, Jianhua
• Format: Journal Article
• Language: English
• Published: United States 01.11.2013
• ISSN: 1089-7623
• DOI: 10.1063/1.4827083

To verify the performance of high power waveguide transmission devices such as the miter bend, the waveguide taper, and the quasi-optical mode converter by the low power measurement, a TE01 mode generator, converts the rectangular waveguide TE10 mode into the cylindrical waveguide TE01 mode, for Ka-band is designed, fabricated, and measured. The proposed generator consists of a TE10 to TE20 rectangular waveguide mode converter and a rectangular TE20 to circular TE01 mode converter. The converting process in each section is analyzed and the working principles are discussed. Two prototypes are built and tested. The back-to-back transmission measured results agree well with the numerical calculations. The measured optimum transmissions are 97% with a 1-dB bandwidth from 29.2 GHz to 31.6 GHz. The angle-independent transmissions demonstrate high mode purity and the presence of TE01 mode confirmed by the far-field measurement. The proposed mode generator features high conversion efficiency, high mode purity, and moderate broad bandwidth.