ELECTRICAL WAVE FILTER WITH NEUTRALISATION OF NOISES IN WORKING FREQUENCY BAND Russian patent published in 2009 - IPC H03H7/09 H03H9/46 

FIELD: physics, radio.

SUBSTANCE: invention concerns radio electronics and can be used as a radio-receiving preselector. Declared filter consists of joined filters in cascade of the upper and lower frequencies, one or two groups of the inductance coils are also entered, the first outputs of the first group of inductance coils are joined among themselves and connected to a point of linking of filters of the upper frequencies of the first group and the first of group of filters of the inferior frequencies, the first outputs of inductance coils of the second group are joined among themselves and connected to a point of linking of last of group of filters of the inferior frequencies and the first filter of the upper frequencies of the second group, the second outputs of inductance coils of the first and second groups are connected to inlets of in addition entered circuit changer, circuit changer outputs are connected to the first outputs of in addition entered condensers, the second deductions of condensers are joined to the general busbar.

EFFECT: improvement of operational parametres of the device, expansion of its functionality.

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