Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition

The invention relates to a Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition, which comprises an input/output interface, four parallel resonant units, a Z-shaped cross coupling circuit and an input and output inductor, wherein the input/output interface is suitable for surface mounting; the four parallel resonant units are realized by adopting two layers of folded coupling strip lines; and the structures are realized by adopting a multi-layer low-temperature co-fired ceramic (LTCC) process technology. The invention has the advantages of good band-passselectivity, good out-of-band inhibition, low insert loss, light weight, small volume, high reliability, good electrical performance, good phase frequency characteristic linearity, good temperature stability, good electrical performance batch consistency, low cost and the like, can realize large batch production, and is especially suitable for wireless communication handheld and portable terminalproducts such as radars, communication terminals, rocket-borne terminals, air-borne terminals, missile-borne terminals, space ships, individual mobile communication terminals and the like, and corresponding frequency band systems with strict requirements on volume, weight, electrical performance, reliability and the like.