Dual mode cavity for waveguide bandpass filters

Details Dual mode cavity for waveguide bandpass filters Dual mode cavity for waveguide bandpass filters

H - Electricity

01

P

H01P 1/20 (2006.01) H01P 1/208 (2006.01)

Patent

CA 2150657

Dual mode cavity for waveguide bandpass filters, which allows the realization of narrow-band filters with very limited transition band and extremely low losses, without tuning or coupling screws or smooth edges. The dual mode cavity is composed of three coaxial sections of waveguide arranged in cascade and provided with irises, of which the two end sections are suited to support two modes with orthogonal polarizations and the intermediate section, consisting of a rectangular waveguide, has its side tilted with respect to the plane on which the irises lie. The whole filter composed of these cavities can be entirely designed by means of a computer and requires no tuning operation.

L'invention est une cavité bimode pour les filtres passe-bande de guide d'ondes qui permet d'obtenir des filtres à bande étroite ayant une bande de transition très restreinte et des pertes très faibles, sans nécessiter de vis d'accord ou de couplage ou de bords lisses. Cette cavité bimode comprend trois sections de guidage coaxiales montées en cascade et dotées d'iris; les deux sections terminales peuvent être utilisées avec deux modes à polarisations orthogonales et la section intermédiaire, qui est un guide d'ondes rectangulaire, est inclinée par rapport au plan de l'iris. Le filtre constitué par l'ensemble de ces cavités peut être entièrement conçu au moyen d'un ordinateur et ne nécessite aucune opération d'accord.

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