Patent ID: 6597259
Filing Date: 2003-07-22
Classification: H01P

Abstract:
A laminate dielectric filter having an asymmetrical band pass response comprising:a dielectric laminate structure including a first dielectric layer, a second dielectric layer and a third dielectric layer; a first resonator element and a second resonator element, said first resonator element and said second resonator element being interposed between said first and second dielectric layers, said first and second resonator elements being arranged in a spaced apart relationship from one another, each of said first and second resonator elements having a first end electrically connected to a circuit ground potential and a second end which is open circuited; an input coupling structure operatively coupled to said first resonator element; an output coupling structure operatively coupled to said second resonator element; a third resonator element, said third resonator element having a first end electrically connected to a circuit ground potential and a second end which is open circuited, said third resonator element being interposed between said second and third dielectric layers and being laterally disposed between said first and second resonator elements; and a coupling element, said coupling element being operatively coupled to said first and second resonator elements, said coupling element being spaced from said first ends of said first and second resonator elements to form a coupled triplet having an asymmetrical filter response between said input coupling structure and said output coupling structure with all transmission zeros of the response on only one side of the filter pass band, wherein said coupling element is a transmission line which is electrically connected to said first and second resonator elements.