BAND-REJECTION TUNABLE LC-FILTER Russian patent published in 2018 - IPC H03H7/00 

FIELD: instrument engineering.

SUBSTANCE: device refers to filters containing co-inductors and can be used in preselectors of professional radio receivers to suppress interference. Band-rejection tunable LC-filter contains identical resonant two-terminal networks, each of which consists of primary coils, connected in series between the input and output of the filter, secondary inductors inductively coupled with each of them with the formation of the corresponding transformers. Corresponding blocks of switched capacitors are connected to these secondary coils to form parallel oscillatory circuits, a series oscillatory circuit is connected between said transformer parallel oscillation circuits to the inductor and the block of switched capacitors connected to the common bus. In this case, it is possible to optimally synthesize and appropriately implement the specified transfer function of the barrier filter in the range of short waves on the elements of capacitance and inductance, the values of which are in the range of implemented values.

EFFECT: technical result consists in creating a device design that would allow to realize the optimal synthesized schemes of the blocking filter on the lumped capacitance and inductance elements.

1 cl, 3 dwg