Further Investigation into the Electromagnetic Susceptibility of an EBG Microstrip Filter

In a dual-plane compact electromagnetic band-gap (C-EBG) microstrip structure, patches are etched periodically in the ground plane to prohibit the propagation of electromagnetic waves in certain frequency bands so as to provide filtering functionality. However, the existence of the etched patches in the ground plane becomes a natural concern. These structures might be more prone to electromagnetic interference from nearby radiating components as compare to a microstrip filter with a perfect ground plane. In this paper, a further investigation into the electromagnetic susceptibility of a C-EBG filter structure is presented as a continued work of the previous ones [1] [2]. This study examines the coupling and crosstalk effects of a coplanar microstrip line on the performance of a C-EBG structure. It includes the effect of the relative power level, direction of transmission of signals, and the relative position. From the study, useful guidelines are drawn for the applications of EBG microstrip structures in an environment rich in electromagnetic interference.