Title :
Reduction of the Coupling to External Sources and Modes of Propagation by a Nearly Confocal Resonator
Author :
Cheng, Shi ; Ferrari, Arnaud ; Johnson, Magnus ; Rydberg, Anders ; Ziemann, Volker ; Öjefors, Erik
Author_Institution :
Uppsala Univ., Uppsala
Abstract :
This paper presents a numerical and experimental study of a nearly confocal resonator with spherical mirrors at 12 GHz. The geometry was chosen in order to have a large quality factor for the diffraction losses, and thereby a weak coupling to external parasitic TE and TM modes, that propagate in a pipe on which the resonator may be installed. In turn, this allows a significant improvement of its signal-to-noise ratio, e.g., when used as a beam monitor.
Keywords :
dielectric resonators; electromagnetic wave diffraction; electromagnetic wave propagation; microstrip resonators; signal processing; beam diagnostics; beam monitor; confocal resonator; diffraction loss; external parasitic TE mode; external parasitic TM mode; frequency 12 GHz; geometry; propagation mode; reflection coefficient; signal-to-noise ratio; spherical mirrors; transmission coefficient; weak coupling; Diffraction; Geometry; Mirrors; Monitoring; Optical resonators; Particle beams; Propagation losses; Q factor; Signal to noise ratio; Tellurium; Beam diagnostics; confocal resonator; reflection and transmission coefficients;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2007.906451
