Improved selectivity in cylindrical TE/011/ filters by TE/211//TE/311/ mode control
Abstract
The present investigation has the objective to show that even if TE(211) and TE(311) modes cannot be suppressed in sidewall-coupled cavities, the modes can be controlled in a manner which can enhance the filter performance for many applications. In addition, a lumped constant circuit representation of the cylindrical resonator is provided which accurately describes the response of the resonator over a large frequency range. This representation includes not only the TE(011) but also the TE(211) and TE(311) modes. Attention is given to TE(211)/TE(311) mode control considerations, experimental data on single cavity resonators, transmission nulls due to mode interaction, and a lumped constant circuit model.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- September 1982
- DOI:
- 10.1109/TMTT.1982.1131265
- Bibcode:
- 1982ITMTT..30.1383K
- Keywords:
-
- Cavity Resonators;
- Electrical Impedance;
- Insertion Loss;
- Microwave Filters;
- Propagation Modes;
- Capacitance;
- Coupled Modes;
- Equivalent Circuits;
- Field Mode Theory;
- Frequency Response;
- Phase Shift;
- Electronics and Electrical Engineering