Patent ID: 8378762
Filing Date: 2013-02-19
Classification: H01P

Abstract:
1. A filter comprising: a substrate made of an isolating material; a plurality of identical planar transmission line segments formed one under another by use of conductor layers embedded in said substrate and arranged in a predetermined manner in a direction perpendicular to said conductor layers; vertical transitions connecting one by one said plurality of transmission line segments, wherein adjacent said vertical transitions are equally spaced on a predetermined distance in a direction parallel to said plurality of transmission line segments, thereby said vertical transitions serve as periodic inclusions providing an electromagnetic band gap effect, and forming conjointly with said plurality of planar transmission line segments of an electromagnetic band gap (EBG) structure; and terminals connected in a predetermined manner to top and bottom ones of said plurality of transmission line segments of said EBG structure, wherein a defect is formed in said EBG structure, thereby providing a pass band within a stop band.