Jp. Crenn et C. Charollais, PROPAGATION AND RADIATION CHARACTERISTICS OF THE CIRCULAR ELECTRIC, CIRCULAR MAGNETIC AND HYBRID WAVE-GUIDE MODES, International journal of infrared and millimeter waves, 17(9), 1996, pp. 1475-1506
The field distributions and propagation constants of the circular elec
tric, circular magnetic and hybrid modes of oversized waveguides are e
xpressed, taking the effects of walls into account. These effects are
described by wall functions which depend on surface impedances of the
wall, and are determined for different types of guides. The near and f
ar field patterns are derived in the case of real wall functions. It i
s shown that, for very oversized waveguides, the terms containing wall
functions can be ignored in the calculations, and it results that the
expressions of fields and propagation constants become independent of
the types of waveguides. An application to corrugated waveguides for
Electron Cyclotron Resonance Heating experiments shows the variations
of the radiation characteristics versus geometric parameters of the co
rrugations and determines the ranges of interest for these parameters.