Patent ID: 6169465
Filing Date: 2001-01-02
Classification: H01P

Abstract:
A duplexer dielectric filter, comprising: a dielectric block including first and second surfaces facing to each other and a side surface disposed between said first and second surfaces, said second and side surfaces being substantially covered with a conductive material; a receiving area having a plurality of resonators formed by respective resonant holes which are disposed to pass between said first and second surfaces of said dielectric block in a substantially parallel manner and are substantially covered with said conductive material on the interior thereof and for filtering a first input signal, said receiving area having a first conductive pattern on the first surface to form an electromagnetic coupling between said resonators; a transmitting area having a plurality of resonators formed by respective resonant holes which are disposed to pass between said first and second surfaces of said dielectric block in a substantially parallel manner and are substantially covered with said conductive material on the interior thereof and for filtering a second input signal, said transmitting area having a first conductive pattern on the first surface to form an electromagnetic coupling between said resonators; input/output terminals each including an electrode area isolated from said conductive material on the side surface of said dielectric block and for forming an electromagnetic coupling with a respective resonant hole; an antenna terminal having an electrode area isolated from said conductive material on the side surface of said dielectric block and disposed between said first and second filtering areas of said dielectric block to thereby form an electromagnetic coupling with a respective said resonator of said receiving and transmitting areas; and at least one second conductive pattern formed on said first surface of said dielectric block, along an arrangement direction of said resonant holes, for strengthening a coupling capacitance between adjacent resonators and for forming a cross coupling capacitance between non-adjacent resonators.