Integrated evanescent mode filter with adjustable attenuator

Details Integrated evanescent mode filter with adjustable attenuator Integrated evanescent mode filter with adjustable attenuator

H - Electricity

01

P

H01P 5/107 (2006.01) H01P 1/22 (2006.01)

Patent

CA 2237615

A waveguide evanescent mode filter (8) is integrated with a monolithic microwave integrated circuit (MMIC) (6) by forming both the MMIC circuitry (10) and the waveguide filter (8) on a single substrate that forms a common ground plane (15) for both elements. The waveguide (14) has a superstructure with an interior recess that is contoured to provide a desired cutoff frequency. The underlying portion of the ground plane can form the lower portion of the waveguide (14) itself, and can also be contoured to define the cutoff frequency. Adjustable attenuation is provided by a resistive card (26) that can be inserted by different amounts into the waveguide (14).

On fabrique un filtre (8) à mode évanescent, destiné à un guide d'ondes, en monobloc avec un circuit intégré monolithique hyperfréquence (MMIC) (6) en formant le circuit MMIC (10) et le filtre (8) de guide d'ondes sur le même substrat, qui constitue une plaque de masse (15) commune aux deux éléments. Le guide d'ondes (14) comporte une superstructure qui présente un évidement interne profilé, permettant de donner une fréquence de coupure désirée. La partie inférieure de la plaque de masse, qui peut constituer la partie inférieure du guide d'ondes (14) lui-même, peut également être profilée de façon à définir la fréquence de coupure. L'atténuation réglable se fait au moyen d'une carte résistive (26) qui peut être insérée, en nombre variable, dans le guide d'ondes (14).

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