Patent ID: 7694595

Claim:
A resonator, comprising: a shell ( 1 ); said shell having a pole ( 2 ); said pole being held by a support rod ( 3 ); the shell ( 1 ) having an annular edge ( 4 ) defined by an inside surface ( 5 ) and an outside surface ( 6 ) that are substantially hemispheres and that extend around a common axis of revolution (R); wherein a center (C 1 ) of the inside surface ( 5 ) and a center (C 2 ) of the outside surface ( 6 ) are offset relative to each other along the axis of revolution ( 5 ) with a predetermined distance (d) between the centers (C 1 , C 2 ); and wherein a radius (R 1 ) of the inside surface ( 5 ) is different from a radius (R 2 ) of the outside surface ( 6 ) in such a manner that the shell presents thickness (E) along the annular edge ( 4 ) that is greater than the thickness (e) that the shell presents in the vicinity of the pole.