The invention discloses a distributed type filter circuit. The structure of the novel filter circuit is realized by a capacitor and a coupler. The distributed type filter circuit can be widely applied in places such as a WCDMA mobile communication power amplifier and a radar antenna with strict requirement of signal performance. Out-of-band noise can be resisted, and the stability of an electronic circuit is improved. At the same time, compared with band filter circuits with other structures, the distributed type filter circuit can realize adjustable band-pass filtering and can be applied in different frequency bands of a communication system.