PHASE-SHIFT FILTER METHOD

摘要

Discloses is a phase-shift filter method, for use in solving the problem of interference to a communication channel from frequencies adjacent to the communication channel. In a signal receiving system of the present invention, a phase adjusting module is used to adjust the phase difference within a designated frequency band and outside the designated frequency band for signals in two input ports, thus allowing for the phase difference of the signals outputted by two output ports to be at 0 degrees within the designated frequency band, and for the phase difference to be at 180 degrees outside the designated frequency band; or, for the phase difference of two signals outputted by the adjusting module to be at 180 degrees within the designated frequency band, and for the phase difference to be at 0 degrees outside the designated frequency band, then, a power combiner module is used to filter the frequency band occupied by a designated communication channel or an electromagnetic signal outside the frequency band occupied, thus in-band electromagnetic noises are filtered out, the capability of a receiving system of a device is improved in terms of resistance against electromagnetic interferences, and electromagnetic noises of channels adjacent to the communication channel are greatly suppressed. The robustness of the communication system in complex electromagnetic environments is greatly enhanced.