High isolation, planar filters using EBG substrates

The concept of electromagnetic bandgaps (EBGs) has been utilized to develop a high-quality filter that can be integrated monolithically with other com ponents due to a reduced height, planar design, Coupling adjacent defect el ements in a periodic lattice creates a filter characterized by its ease of fabrication, high-Q performance, high-port isolation, and integrability to planar or 3-D circuit architectures. The filter proof of concept has been d emonstrated in a metallo-dielectric lattice. The measured and simulated res ults of 2-, 3-, and 6-pole biters are presented at 10.7 GHz.