Slot Line - An Alternative Transmission Medium for Integrated Circuits

Current development of microwave integrated circuits has revived interest in microstrip transmission line as a means of interconnecting solid-state elements into signal-processing subsystem. This paper describes an alternative kind of transmission line on a dielectric substrate that may be used with or instead of microstrip. As shown in Fig. 1, this alternative consists of a narrow slot or gap in a conductive coating on one side of the substrate. The other side of the substrate is exposed directly to air.