Planar filters having periodic electromagnetic bandgap substrates

摘要

The concept of electromagnetic bandgaps (EBG) is used to develop a high quality filter that can be integrated monolithically with other components due to a reduced height, planar design. Coupling adjacent defect elements in a periodic lattice creates a filter characterized by 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 demonstrated in a metallodielectric lattice. The measured and simulated results of 2, 3 and 6 pole filters are presented at 10.7 GHz, along with the equivalent circuits.