Abstract
The HE II mode in a corrugated waveguide has a field distribution very close to that of an ideal gaussian mode. Its radiation pattern is symmetrical about tho wave-guide axis and exhibits virtually no cross-polarization. This work reports measurements on mode converters to transform tho TE 01 mode into HE 11 for electron cyclotron heating (ECH) experiments. The first mode converter is a 28° bend in 1.094 inch internal diameter (I.D.) circular waveguide which generates TM 11 from TE 01 with a measured officiency of over 95% at 60 GHz. In a socond converter, which consists of a straight corrugated waveguide section of the same I.D., the corrugation depth increases gradually from zero to nominally one quarter wavelength. This section converts TM 11 to HE 11 with an efficiency of about 97%. The overall efficiency of conversion from TE 01 to HE 11 exceeds 91% over a measured range of 59.2 to 60.1 GHZ.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
