MICROWAVE FILTER AND METHOD FOR FABRICATING MICROSTRIP BAND PASS FILTER

摘要

A microwave filter which is used for implementing a band filtering with respect to a microwave signal of a predetermined band for various portable mobile communication products including a cellular phone, a GPS (Global Positioning System), and a PCS (Personal Communication System). The filter is capable of fabricating a compact size and light band pass filter by forming a microstrip resonator using a known semiconductor process such as a photolithography, an etching process, etc. after a conductive metallic layer such as Cr, Cu, etc. is deposited on a dielectric substrate of a high dielectric rate using a ceramic dielectric such as BaTi4O9, ZnO. The microwave filter includes a groove (150, 160) formed in a center portion of an opposite surface of a pair of microstrip resonators (130, 140) opened to each other and arranged to face each other for thereby filtering only a predetermined band frequency.