An analysis of a hybridmode in a twisted rectangular waveguide
Abstract
Analytic expressions of electromagnetic fields for the dominant hybridmode in a twisted rectangular waveguide are obtained. The fields exactly satisfy the boundary conditions on the guide walls in a helicoidal shape. By expanding these expressions for the fields in terms of the eigenfunctions of a straight waveguide, the hybridmode is found to be composed of a fundamental TE(10)mode component, accompanied with TE(01), TM(21), TE(21), and TE(03) modes, as successive higher order components. The result of the modal power calculation reveals that there exists a frequency at which the transmitting power carried in the crosspolarized TE(01)mode component just vanishes. As a limiting case of the twisted waveguide, fields in a twisted strip line are discussed also, and the existence of a propellerlike equiphase surface is shown.
 Publication:

IEEE Transactions on Microwave Theory Techniques
 Pub Date:
 January 1984
 DOI:
 10.1109/TMTT.1984.1132613
 Bibcode:
 1984ITMTT..32...65Y
 Keywords:

 Electromagnetic Fields;
 Field Mode Theory;
 Propagation Modes;
 Rectangular Waveguides;
 Strip Transmission Lines;
 Boundary Conditions;
 Boundary Value Problems;
 Cross Polarization;
 Design Analysis;
 Microwave Transmission;
 Perturbation Theory;
 Series Expansion;
 Twisting;
 Electronics and Electrical Engineering