COMPACT BROADBAND MONOLITHIC 3-dB COUPLER BY USING ARTIFICIAL TRANSMISSION LINES

摘要

This letter presents a broadband rat-race coupler designed by using right-handed artificial transmission lines (ATLs) combined with a composite right/left-handed ATL; in order to limit spurious parasitic effects, by using metal-air-metal capacitor and short circuited stubs, both kinds of ATLs have been designed without lumped elements, leading to a very compact and monolithic device.