TRIPLE-BAND BANDPASS FILTER USING TRIPLE-MODE STUB-LOADED STEP IMPEDANCE RESONATOR

摘要

According to one embodiment of the present invention, a triple band pass filter using a triple mode resonator includes two triple mode resonators and three frequency pass bands. The triple band pass filter includes first and second triple mode resonators. The first triple mode resonator comprises: a first stepped stub having of a spherical structure having one opened side; a first and a second open-ended stub connected to the inner side of the first step type stub in order to be placed in the opened inner space of the first step type stub, and forming a vertical symmetric structure with respect to a virtual horizontal central axis intersecting the center of the first step type stub; and a first input/output stub connected to the outer side of the first step type stub. The second triple mode resonator has the same shape as the first triple mode resonator, and is formed by rotating the first triple mode resonator at 180 centered on a virtual central point. The triple band pass filter may include a structure in which micro strip line is formed in a planar placement structure on one substrate.