Patent ID: 6078231
Filing Date: 2000-06-20
Classification: H01P

Abstract:
A high-frequency filter comprising:a first coaxial resonator including a first inner conductor and a first outer conductor;a second coaxial resonator including a second inner conductor and a second outer conductor, each of said first and second coaxial resonators including a top end and a short circuited bottom end, and an air gap existing between each said respective inner and outer conductors;a base plate attached to the short circuited bottom ends of said first and second coaxial resonators;a dielectric board including a first hole and a second hole therethrough; andat least one electrically conductive element on a surface of said dielectric board to provide an electromagnetic coupling to at least one of said first and said second coaxial resonators, wherein said first inner conductor extends through said first hole, said second inner conductor extends through said second hole and said dielectric board is located at a distance in the direction toward the base plate from said top end of said at least one of said first and second coaxial resonators to which said dielectric board is coupled.