Variable bandwidth active filter for filtering signals processed by microwave frequency transmission/reception channel in airborne field, has filtering cells to couple lines, where one cell of one row has bandwidth of sub-band of same row

摘要

The filter has a series of active filtering cells (CF1-CFn) for coupling an input propagation line (Lg) with an output propagation line (Ld). The cells comprise respective microwave frequency inputs (ec1-ecn) connected to the input propagation line and microwave frequency outputs connected to the output propagation line, where one of the cells of one row has bandwidth of a sub-band of the same row. Active input cells (Cle1-Clen) are arranged between the inputs and the outputs, and arranged in cascade with active output cells (Cls1-Clsn) by filter parts (Fp1-Fpn), respectively. The filter parts are band-pass filter parts, active filter parts and passive filter parts.