Radio frequency filter employing notch structure

Abstract

The present invention relates to a radio frequency filter employing a notch structure, wherein the notch structure is a dual notch structure which comprises: a C notch structure formed in a predetermined region at a partition between two cavities to be cross-coupled; and an L notch structure formed together with the C notch structure in a predetermined region at a partition between two cavities.

1 . A radio frequency filter employing a dual notch structure, comprising:
 a C type notch structure formed in a predetermined region on a partition interposed between two cavities to be cross-coupled; and   an L type notch structure formed along with the C type notch structure in the predetermined region of the partition between the two cavities.   
     
     
         2 . The radio frequency filter as claimed in  claim 1 , wherein the L type notch structure extends to a lower end of the C type notch structure and is formed on the partition. 
     
     
         3 . The radio frequency filter as claimed in  claim 1 , wherein the L type notch structure is formed in another region on the partition, separately from the C type notch structure. 
     
     
         4 . The radio frequency filter as claimed in  claim 3 , wherein the C type notch structure is formed in a center region of the partition by reference of a planar surface, and the L type notch structure is formed around the C type notch structure in a certain region on the partition. 
     
     
         5 . The radio frequency filter as claimed in  claim 1 , wherein the radio frequency filter is a three stage filter having a structure in that first, second and third cavities are arranged in a triangular shape, and are sequentially coupled, in which the dual notch structure including the C type notch structure and the L type notch structure together is formed on the partition interposed between the first cavity and the third cavity, two notches are created at a lower end of a processing band of the filter, and one notch is created at an upper end of the processing band, so as to implement notches at both ends of the processing band. 
     
     
         6 . The radio frequency filter as claimed in  claim 1 , wherein the radio frequency filter is a four stage filter having a structure in that first, second, third and fourth cavities are arranged in pairs in two columns, and sequentially cross-coupled, in which the dual notch structure including the C type notch structure and the L type notch structure is formed on a partition interposed between the first cavity and the fourth cavity, and two notches are created at each of the lower end and the upper end of the processing band of the filter, so as to implement the dual notch which is a bilateral symmetry. 
     
     
         7 . The radio frequency filter as claimed in  claim 1 , wherein the radio frequency filter is a six stage filter having a structure in that first, second, third, fourth, fifth and sixth cavities are arranged in three pairs in two columns, and sequentially cross-coupled, in which the dual notch structure including the C type notch structure and the L type notch structure is formed on a partition interposed between the second cavity and the fifth cavity, or a partition interposed between the first cavity and the sixth cavity.