A RESONATOR AND A CAVITY FILTER HAVING IT

The present invention relates to a resonator, which may be simply assembled and have great durability. The resonator according to an embodiment of the present invention may comprise: a unit resonator which has a cylindrical column part extending in a vertical direction and is made of dielectric materials; a step resonator which is installed on the upper end of the unit resonator, is formed in a cylindrical shape having a diameter greater than the diameter of the column part, and is made of dielectric materials; and a helical resonator which is helically formed to come in close contact with and cover the outer surface of the step resonator and unit resonator and is made of conductive materials. 본 발명의 실시예에 의한 공진기는, 수직방향으로 연장되는 원통형의 컬럼부를 가지며, 유전체로 이루어지는 유닛 공진기; 상기 유닛 공진기의 상단에 설치되며, 상기 컬럼부보다 지름이 더 큰 원통형으로 형성되며, 유전체로 이루어지는 스텝 공진기; 상기 스텝 공진기와 상기 유닛 공진기의 외면에 밀착되어 감싸도록 나선형으로 형성되며, 도체로 이루어지는 헬리컬 공진기;를 포함할 수 있다.