A stepped-impedance true time delay line using GaAs MMIC technology

Abstract

A new true time delay line (TTDL) using a stepped impedance (SI) structure is proposed for compact and wideband TTDLs in GaAs MMICs. An equivalent circuit model and a dispersion equation for the proposed SI-TTDL are also presented. Experimental verification and comparison with a conventional design are provided. The group delay of the proposed SI-TTDL is substantially increased up to approximately twice of a conventional microstrip transmission line in GaAs MMICs.