Design and fabrication of a 180° hybrid ring coupler inserted into a slow-wave structure for MMIC applications using dielectric-supported air-gapped microstriplines

Abstract

In this paper, we design and fabricate a 180° hybrid ring coupler in order to prove the fabrication possibilities of various passive components, by applying millimeter waves using newly proposed transmission lines, that is, dialectric-supported air-gapped microstriplines (DAMLs). In order to reduce the size of the hybrid ring coupler, we design it with an inserted slow-wave structure. With this structure, we were able to reduce the hybrid ring coupler's area by 33%. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 440–443, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21194