Patent ID: 9620836
Date: 2017-04-11
CPC Classifications: H01P

Claim:
1. A bandpass dual mode filter for microwave-frequency wave, the bandpass dual mode filter being frequency tunable, the bandpass dual mode filter comprising: at least one resonator, each said at least one resonator including: said at least one resonator resonating according to a mode for which two perpendicular polarizations respectively have distributions of the electromagnetic field in the respective cavity, said distributions of the two perpendicular polarizations being obtained from one another by a rotation of the respective dielectric element by 90° around an axis of symmetry of the at least one resonator; said mode having in said respective cavity N maxima and N+1 minima of the electromagnetic field, N being an integer, said N maxima and N+1 minima are situated substantially in a plane perpendicular to the axis Z, the two ends of the respective substantially cylindrical conducting wall at the abscissae z=0 and z=H corresponding to respective electromagnetic field minima, successive minima and maxima in the N maxima and N+1 minima being spaced apart by a separation distance H/2N;