A heuristic approach is presented to quantify the broadband isolation performance of nonuniform capacitively loaded electromagnetic bandgap (EBG) surfaces embedded inside a parallel plate waveguide (PPW). The approach is based on the effective mapping of the stop-band properties of the EBG to the attenuation factor (AF) of a homogeneous material slab. Subsequently, it is demonstrated that the electromagnetic wave propagation through the EBG-loaded PPW is equivalent to the propagation through a multilayered medium where each layer is characterized by a different AF. When these AFs are engineered so that their nonzero values spectrally overlap, a cumulative broadband attenuation effect can be obtained. Based on this interpretation, the broad bandgap properties that are characteristic of nonuniform capacitively loaded EBG surfaces are fully quantified.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering