Bandpass microwave filter tunable by relative rotation of an insert section and of a dielectric element

摘要

A bandpass filter for microwave-frequency wave which is frequency tunable, comprises at least one resonator. Each resonator comprises a cavity having a conducting wall substantially cylindrical in relation to an axis Z, and at least one dielectric element disposed inside the cavity. The resonator resonates on two perpendicular polarizations having respectively distributions of the electromagnetic field in the cavity that are deduced from one another by a rotation of 90° and according to one and the same frequency. The wall of the cavity comprises an insert section facing the element having a different shape from a section not situated facing the element. The insert section and the element are able to perform a rotation with respect to one another in relation to the axis Z so as to define at least a first and a second relative position differing by an angle substantially equal to 45° to within 20°.

主权项

1. A bandpass dual mode filter for a microwave-frequency wave, the bandpass dual mode filter being frequency tunable, the bandpass dual mode filter comprising:
at least one resonator, each of said at least one resonator including:
a respective cavity having a conducting wall shaped substantially cylindrical in relation to an axis Z, anda respective dielectric element disposed inside the corresponding cavity,said at least one resonator resonating at two perpendicular polarizations having respectively distributions of an 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 of 90° around an axis of symmetry of the at least one resonator,the conducting wall of the respective cavity including an insert section facing said respective dielectric element, said insert section having a different shape from a shape of a section not facing the respective dielectric element,the insert section and the respective dielectric element being configured to perform a rotation with respect to one another in relation to the axis Z to define at least a first relative position and a second relative position differing by an angle substantially equal to 45° to within 20°.