IMPROVED LUMPED COMPONENTS BAND PASS FILTER INTO THE SUBSTRATE

摘要

A band-pass filter using a lumped passive element for selectively filtering a use frequency band is provided to improve a pass property and a band-stop property by inserting a parasitic inductance component to a parallel resonator. A band-pass filter includes a first parallel resonator and a second parallel resonator(13). The first parallel resonator comprises an inductor(L3) and a capacitor(C3), is serially connected between an input port(10) and an output port(11), and has a band-stop property. The second parallel resonator comprises an inductor(L1) and a capacitor(C1), and improves the band-stop property in an image frequency band.