Title :
Slot-fed higher order mode Fabry-Perot filters
Author :
McCleary, James ; Li, Ming-yi ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
10/1/1993 12:00:00 AM
Abstract :
Low-loss bandpass filters consisting of Fabry-Perot resonators excited by waveguide-fed slots coupling to higher-order resonator modes are demonstrated. For close reflector spacings, the waveguide couples efficiently through the slots to the TEM400 and TEM300 modes. The characteristics of both rectangular and circular waveguide feeds with various slot lengths and widths are presented. At X-band the filters have unloaded Q values which range from 1000 to 7000 with insertion losses less than 1 dB. The filters which have the rectangular waveguide feeds are mechanically tunable over a 20% bandwidth
Keywords :
Q-factor; band-pass filters; cavity resonators; circular waveguides; losses; microwave filters; passive filters; rectangular waveguides; tuning; waveguide components; Fabry-Perot filters; Fabry-Perot resonators; TEM300 mode; TEM400 mode; X-band; circular waveguide feeds; higher order mode; insertion losses; low-loss bandpass filters; mechanically tuning; microwave filters; rectangular waveguide feeds; slot-fed filters; waveguide-fed slots; Apertures; Band pass filters; Dielectrics; Fabry-Perot; Feeds; Insertion loss; Optical coupling; Rectangular waveguides; Resonator filters; Submillimeter wave filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
