System and method for tuning multicavity filters
View Patent ↗The invention refers to a system and method to tune a multicavity filter of microwave signals, said filter comprising a filter body (CF), a removable lid (CO), n resonant cavities dug out in said filter body (CF) and n tuners (TU) susceptible of displacement under the action of movement means. Typically a sub-system to absorb the oscillations and vibrations generated in such displacements is associated to each tuner.
1. System for tuning a simple or complex multicavity high frequency and microwave filter, including a body filter; a removable lid; n resonant cavities in said body filter; n resonant rods, disposed in the middle of each cavity; n tuners passing through the filter lid in correspondence to each resonating rod and tuner moving device, characterized in that:
a subsystem is associated with each tuner to compensate for vibrations and oscillations; and
the lid is provided with n slots, which are longitudinally placed over the middle of the cavity and have a length sufficient to assure the tuning in every frequency band.
2. System according to claim 1 , in which the subsystem comprises means for longitudinal translation of said tuners and means for making the tuner components elastic.
3. System according to claim 2 , in which the longitudinal translation means are slides associated to a motor device and the means for making the tuner components elastic comprises a shock absorber made of a helical spring orthogonal to the slide axis.
4. System according to claim 1 , in which the tuner is made of a plurality of elements, including a head and a nut for blocking movement of the tuner on a slide, said head being formed of a threaded cylinder and of a rectangular element which penetrates into a corresponding niche in the slide in order to reduce a vertical dimension of the system.
5. System according to claim 1 , in which an inferior portion of each tuner passes through the slot, and a superior portion of each tuner is engaged into a groove of a cover of the filter.
6. System according to claim 4 , in which the head and nut are made of polyetherimide polymer.
7. System according to claim 4 , in which blocks, overlay the slide in corresponding grooves, fixing movement of the slide in vertical and horizontal direction.
8. System according to claim 1 , in which by means of stabilizing subsystem, mechanical tolerances due to the assembly process and vibration related to the movement are compensated.
9. System according to claim 4 , in which the elements for blocking the tuner on the slide control cavity frequency response.