Microwave chirped delay effect based on substrate thickness modulation

Abstract

This paper deals the generation of chirped delay (CD) effect in microwave regime. For the purpose of achieving reflection dispersion, electromagnetic band-gap (EBG) structures with different rejection frequency are fabricated in different position by modulating the thickness of substrate. Microwave with different frequency will be reflected in different position, so non-flat reflected group delays responses can be obtained. One CD-EBG with 6-10 GHz operation frequency range is designed, fabricated and measured. Different group delay responses are obtained when feeding from different ports. Finally, temporal characteristic of the CD-EBG is studied by simulation and two chirped impulses are obtained.