RF filter and communication device having the same

Abstract

An RF filter, comprising a chassis (1) that defines a cavity, and a plurality of resonators (2a, 2b) that are disposed in the cavity, wherein at least one resonator (2) comprises a body part (21) that extends in a first plane from a first end to an opposite second end along a first direction, an enlarged portion (22) that is provided at the second end and extends in the first plane along a second direction substantially perpendicular to the first direction so as to have a larger width in the second direction than the body part (21), and a folded portion (23) that is formed by bending along a lateral edge of the enlarged portion (22) at an angle of about 90° so as to extend in a second plane substantially perpendicular to the the second direction. The folded portion (23) plays a role in forming a coupling of the resonator with an adjacent resonator. The body part (21), the enlarged portion (22) and the folded portion (23) are made of a metal strip line, or a strip-line made of non-metal base with a metallized surface. The folded positions of two adjacent resonators can achieve desired coupling polarity.

Dependencies are inferred from the claim text.