Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 1994 | Published
Journal Article Open

Powder core dielectric channel waveguide

Abstract

A powder-filled rectangular groove in the surface of a plastic substrate has been demonstrated as a dielectric waveguide at 94 GHz. Propagation losses as low as 0.09 dB/cm were measured by direct transmission with nickel-aluminum titanate powder in a polypropylene substrate and with barium tetratitanate powder in a polytetrafluoroethylene (PTFE) substrate; values as low as 0.06 dB/cm were deduced from ring resonator measurements. Guide wavelengths measured for various combinations of guide dimensions, powders, and substrates agree within 10% with values predicted by the approximate theory of Marcatili for the E/sub 11//sup y/ mode. Effective loss tangents for the powders at 94 GHz were calculated from waveguide attenuation measurements, using Marcatili's field solutions. Ring resonators fabricated by filling a groove in a polypropylene substrate with nickel-aluminum titanate powder exhibit Q's as high as 2400 at 94 GHz in an 8 cm diameter ring. Coupling to the resonators was achieved with adjacent straight powder core channel guides as directional couplers.

Additional Information

© 1994 IEEE. Manuscript received March 12, 1993; revised October 12, 1993. This work was supported in part by an Army Research Fellowship under Grant DAAG29-83-G-0017 and in part by Army Research under Grant DAAG29-84-K-0100.

Attached Files

Published - 00297815.pdf

Files

00297815.pdf
Files (877.6 kB)
Name Size Download all
md5:8d7ea04d681ac47d8bc14e4bead79989
877.6 kB Preview Download

Additional details

Created:
August 20, 2023
Modified:
October 20, 2023