Title :
Investigation of mode coupling due to ohmic wall losses in overmoded uniform and varying-radius circular waveguides by the method of cross sections
Author :
Shafii, Jamal ; Vernon, Ronald J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
fDate :
5/1/2002 12:00:00 AM
Abstract :
The effect of ohmic wall losses on mode coupling in overmoded varying-radius circular waveguides is investigated. Mode coupling and multimode propagation in uniform lossy-wall circular waveguides is also discussed. The expressions for the coupling coefficients are given by line integrals of the power-normalized fields of the normal modes along the boundary of the waveguide cross section. Numerical results are presented for the case of propagation of an HE11-like mode excitation in a uniform smooth lossy-wall circular waveguide
Keywords :
boundary-value problems; circular waveguides; coupled mode analysis; differential equations; waveguide theory; coupled differential equations; coupled-mode formalism; coupling coefficients; eigenmodes; hybrid mode excitation; line integrals; method of cross sections; mode coupling; multimode propagation; ohmic wall losses; overmoded circular waveguides; power-normalized fields; uniform lossy-wall circular waveguides; varying-radius circular waveguides; Attenuation; Conductors; Couplings; Electric breakdown; Gyrotrons; Integral equations; Millimeter wave propagation; Millimeter wave technology; Planar waveguides; Propagation losses;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
