Patent ID: 6122489
Filing Date: 2000-09-19
Classification: H01P,H04B

Abstract:
A dielectric filter which comprises:a first dielectric block having a first end surface, a second end surface and a plurality of side surfaces extending between said first and second end surfaces of said first dielectric block, with a first resonator hole substantially covered with a conductive material which provides a first resonator extending between said first and second end surfaces of said first dielectric block;a first input coupling disposed on at least one of said side surfaces of the first dielectric block and coupled to said first resonator;a first output coupling disposed on another one of said side surfaces of the first dielectric block and coupled to said first resonator;a second dielectric block having a first end surface, a second end surface and a plurality of side surfaces extending between said first and second end surfaces of said second dielectric block, with a second resonator hole substantially covered with a conductive material which provides a second resonator extending between said first and second end surfaces of said second dielectric block;a second output coupling disposed on at least one of said side surfaces of the second dielectric block and coupled to said second resonator;a second input coupling disposed on another one of said side surfaces of the second dielectric block and coupled to said second resonator;a first coating comprised of a conductive material substantially covering said first and second end surfaces and said side surfaces of the first dielectric block, except for parts where said first input coupling and first output coupling are provided;a second coating comprised of a conductive material substantially covering said first and second end surfaces and said side surfaces of the second dielectric block, except for parts where said second input coupling and second output coupling are provided;wherein said first output coupling and said second input coupling include conductive substances disposed entirely on respective facing side surfaces of the first dielectric block and the second dielectric block and arranged so as to face each other, and are electrically insulated from said first coating of the first dielectric block and from said second coating of the second dielectric block, respectively;a connecting material electrically connecting said first output coupling with said second input coupling, and fixing said first dielectric block to said second dielectric block at said respective facing side surfaces;wherein said first output coupling and said second input coupling are substantially completely surrounded and thereby shielded against electromagnetic energy leakage by said connecting material which is disposed on said respective facing side surfaces.