Patent ID: 6960969

Claim:
A resonant cavity device comprising a waveguide body having a lateral wall extending in a longitudinal direction, having a first coefficient of thermal expansion, and delimiting a resonant cavity in conjunction with opposite first and second end walls, wherein said first end wall has a second coefficient of thermal expansion lower than said first coefficient and has an internal face fastened to a first assembly comprising at least one main plate having a third coefficient of thermal expansion lower than said first coefficient and dimensions in a plane perpendicular to said longitudinal direction less than but substantially equal to said cavity, and an intermediate member having a fourth coefficient of thermal expansion higher than said third coefficient and having an end portion fixed to said main plate and adapted, in response to a temperature variation, to convert a dimensional variation in a direction perpendicular to said longitudinal direction into a dimensional variation in said longitudinal direction inducing longitudinal translation of said main plate inside said cavity.