Band-pass filtering device with servo-controlled tuning
AssigneeThomson-CSF
InventorsPierre de Bayser, Pierre Mondoloni
Life of this patent
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Abstract
Filtering device comprising a microwave band-pass filter with resonant cavities tunable by a single mechanical control shaft, an additional resonant cavity which is also controlled by this single control and which is tuned to a frequency shifted by a fixed value in relation to that of the other cavities, and a servocontrol mechanism for controlling the tuning of this additional cavity in dependence upon a frequency, for instance that of the local oscillator of a frequency converter, the simple storage of this frequency ensuring the tuning of the band-pass filter.
Claims3
A band-pass filtering device comprising n cells, n being a positive integer, each of them having a mechanical tuning control, said n cells being electrically series connected and simultaneously tunable by means of a single control shaft mechanically coupled to the tuning controls of said n cells, said filtering device further comprising a tuning system including an additional tunable cell having an input and an output, said additional cell being susbstantially identical with said n cells and being tunable by said single shaft, the mechanical tuning control of said additional cell being staggered in relation to those of said n cells so as to provide a predetermined frequency interval between the resonant frequency of said additional cell and said n cells, and said tuning system further comprising a control loop which automatically positions said shaft so that said additional cell is tuned to the frequency of a signal applied to said additional cell input.
Dependencies are inferred from the claim text.