An Equivalent Circuit Model for a Dumbbell-Shaped DGS Microstrip Line

Woo, Duk-Jae; Lee, Taek-Kyung

doi:2014.14.4.415

J. Electromagn. Eng. Sci > Volume 14(4); 2014 > Article

Journal of Electromagnetic Engineering and Science 2014;14(4):415-418.
DOI: https://doi.org/10.5515/JKIEES.2014.14.4.415

An Equivalent Circuit Model for a Dumbbell-Shaped DGS Microstrip Line

Duk-Jae Woo¹, Taek-Kyung Lee²

¹Department of Electrical Engineering and Computer Science, Seoul National University
²School of Electronics, Telecommunication, and Computer Engineering, Korea Aerospace University

Abstract

This paper presents an equivalent circuit model for a dumbbell-shaped defected ground structure (DGS) in a microstrip line. The effects of equivalent circuit elements of a dumbbell-shaped DGS and their magnetic coupling to the host transmission line are modeled as a simple lumped-element circuit. In addition, simple approximate expressions to determine the main circuit parameters for this model are presented. The transfer characteristic calculated by the proposed circuit model is compared with the results of EM simulation and measurement.

Key words: Defected Ground Structure (DGS), Equivalent Circuit Model, Magnetic Coupling