Abstract: Tuned Electromagnetic Bandgap (EBG) devices, and a method for making and tuning tuned EBG devices are provided. The method includes the steps of providing first and second overlapping substrates, placing magnetically alignable conductive material between the substrates, and applying a magnetic field in the vicinity of the magnetically alignable conductive material to align at least some of the material into conductive vias. The method further includes the steps of physically altering via characteristics of EBG devices to tune the bandpass and resonant frequencies of the EBG devices.

Abstract: A pseudo-coaxial vertical transition (10) includes a substrate (16). A bump array is disposed in a substantially concentric bump pattern upon the substrate (16) for simulating a pseudo-coaxial vertical electromagnetic wave propagation. The bump array is formed from a centrally disposed bump (32) having a predetermined bump diameter, and a plurality of at least five ground bumps (36) substantially equi-distant and circularly disposed about the centrally disposed bump (32). The predetermined bump diameter and a bump spacing of the centrally disposed bump are determined in relation to the plurality of ground bumps and a dielectric constant of air for providing a characteristic impedance.