MULTI MODE FILTER HAVING SIMPLE TUNING STRUCTURE

摘要

PURPOSE: A multi mode filter having simple tuning structure is provided to offer a multiple mode filter in which tuning manipulation is easy by including a resonator and a first bolt and a first tuning element having a rotatable structure. CONSTITUTION: One or more cavities are included. A resonator is accepted to each cavity(200). A first bolt(204) is inserted into a filter through a cover and has a rotatable structure. The position of the first bolt is set corresponding to a first mode. A first tuning element(206) is combined with the first bolt, has a variable distance with the resonator to the first mode according to the rotation of the first bolt. A second bolt(208) is inserted into the filter through the cover and has the rotatable structure. The position of the second bolt is set corresponding to a second mode which is orthogonal to the first mode. A second tuning element(210) is combined with the second bolt, has a variable distance with the resonator to the second mode according to the rotation of the second bolt.