STRUCTURE OF TWO-LEVEL INTERDIGITAL BAND PASS FILTER

摘要

PURPOSE: A structure of a two-level interdigital band pass filter is provided to reduce a size of a band pass filter below 1/4 λ by forming the band pass filter with a crook structure instead of a straight line structure. CONSTITUTION: A two-level interdigital band pass filter includes a plurality of micro strip lines or a plurality of strip lines and four or more crooks. The strip lines(110) of the two-level interdigital band pass filter have a symmetric structure. In addition, the strip lines of the two-level interdigital band pass filter are formed with a structure having four crooks(120) or a structure having six crooks. The radius of curvature of the crook is two or more percent of 1/4 λ.