NOVEL LOW PASS FILTERS USING A DEFECTED MICROSTRIP STRUCTURE.

In this article, the stop-band characteristics of a novel defected microstrip structure (DMS) are studied and its application to a low pass filter is proposed. The equivalent circuit model of the unit defected microstrip structure is used to explain the stop-band characteristic at a certain frequency and the parameters of the circuit model are extracted from EM simulation and circuit theory. Two types of three-pole low pass filters and a type of five-pole low pass filter are proposed and optimized as applications of DMS. The measured results on the five-pole low pass filter are in good agreement with the simulated ones. [ABSTRACT FROM AUTHOR]