Wide Bandgap Composite EBG Substrates

William J. Chappell, School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University
Xun Gong, Electrical and Computer Engineering, Purdue University

Date of this Version


This document has been peer-reviewed.



High-K ceramics are embedded into a polymer host to create an electromagnetic bandgap (EBG) substrate that possess superior properties to previous bandgap implementations in terms of stopband width, attenuation per layer, and practicality. Ceramics are periodically spaced in a commercially-available, Teflon-based host to create a bandgap that spans from 12.1 to 24.1 GHz. Miniature dielectric rods were created in a separate extrusion process, and then placed in a square lattice in a substrate to create the periodic composite. As an application of the material, a defect resonator was created at 20.41 GHz and a Q of 760 was measured.