Fields and waves in elliptic waveguides
Abstract
In order to calculate cut-off wavelengths of elliptic waveguides without trying to solve the roots of Mathieu functions, a first order approximation is derived. The elliptic waveguide is decomposed in two circular waveguides for even and odd mode propagation. The cut-off wavelengths of these waveguides are calculated and used as approximate cut-off wavelengths of the elliptic waveguide. Cut-off wavelengths for the dominant TE11-mode can be approximated with a maximum error of 5 percent for all eccentricities. The approximation is also valid for the other modes for small eccentricities.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- February 1994
- Bibcode:
- 1994STIN...9516816V
- Keywords:
-
- Circular Waveguides;
- Mathieu Function;
- Waveguides;
- Eccentricity;
- Errors;
- Transmission Lines;
- Communications and Radar