Allgon Ab

Anders Jansson

Thomas Mattsson

Per Hogberg

The present invention relates to a method for tuning a radio filter. The filter comprises an input connection, an output connection and at least two resonator modules coupled in cascade, each having a tuning mechanism and a probe. A first resonator module is connected to the input connection and a final resonator module is connected to the output connection. The filter is adapted to receive at least one signal within a frequency range. The method comprises essentially two steps: coarse tuning, which is dependent on the frequency content of the received signal(s), and fine tuning, which is dependent on a calculated deviation between a set value vector and a measured signal parameter vector. A relationship between the set value vector and the signal parameter vector is established for calculating the deviation. The invention also relates to a radio filter and a system comprising such a radio filter.

Method for tuning a radio filter, a radio filter and a system comprising such a radio filter

The present invention relates to a method for tuning a radio filter. The filter comprises an input connection, an output connection and at least two resonator modules coupled in cascade, each having a running mechanism and a probe. A first resonator module is connected to the input connection and a final resonator module is connected to the output connection. The filter is adapted to receive at least one signal within a frequency range. The method comprises essentially two steps: coarse tuning, which is dependent on the frequency content of the received signal(s), and fine tuning, which is dependent on a calculated deviation between a set value vector and a measured signal parameter vector. A relationship between the set value vector and the signal parameter vector is established for calculating the deviation. The invention also relates to a radio filter and a system comprising such a radio filter.

A temperature-compensated rod resonator, comprising a housing ( ) having electrically conducting walls, including at least one electrically conductive resonator rod ( ) extending from a bottom wall ( ) towards a top wall ( ), a temperature-compensating plate ( ) located adjacent to said top wall ( ) and coupling means ( ) for transferring electromagnetic energy to and from the resonator. The plate ( ) is adapted to change its geometrical configuration in response to temperature variations. The temperature-compensating plate is a bimetallic plate ( ) having a larger diameter than the resonator rod ( ). A central portion ( ) of said bimetallic plate ( ) is secured to the upper end of the resonator rod ( ), whereby the bimetallic plate, in conjunction with the adjacent top wall ( ) defines a capacitance, which has a dominating influence on the resonance frequency. A pheripheral portion ( ) of the bimetallic plate ( ) is permitted to be freely deflected in response to the temperature variations, whereby the resonance frequency is changed so as to counteract temperature-induced dimensional changes of the housing ( ) and the resonator rod ( ).

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Taby, Sweden

Anders Jansson