NDLI: Tailored and anisotropic dielectric constants through porosity in ceramic components

Content Provider	IEEE Xplore Digital Library
Author	Xun Gong Wing Han She Hoppenjans, E.E. Wing, Z.N. Geyer, R.G. Halloran, J.W. Chappell, W.J.
Copyright Year	1963
Abstract	In this paper, different densities within a ceramic are used to provide a wide continuous range of dielectric constants for high-frequency applications. Cofiring different ceramic materials together to make a single unified structure to obtain different dielectric constant combinations is quite difficult due to phase stability issues and shrinkage mismatches. However, using various levels of porosity in order to alter the effective dielectric constant in the same material allows patterning different dielectric constants into a single unit. Since the structure is made from a single material, the varying porosity regions can be made compatible. Glassy-carbon-assisted and microcellular-structure-based porous titania allow for an extremely wide range of dielectric constants, ranging from 12 to 90, while maintaining a low loss tangent. Highly anisotropic materials are demonstrated herein to achieve a dielectric constant contrast of 90/9.6 using large-range aligned microcellular structure. Dielectric-resonator antennas are shown as an application of adjusting the bandwidth between 0.5% and 2.5% by tailoring the ceramic dielectric constant. A stratified-medium-loaded cavity resonator and a buried dielectric ring resonator internal to a microcellular substrate are used to demonstrate both the cofiring and variable dielectric constant capabilities of structured porosity.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	3638
Ending Page	3647
Page Count	10
File Size	2040554
File Format	PDF
ISSN	00189480
Volume Number	53
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Dielectric constant Ceramics Dielectric materials Dielectric substrates High-K gate dielectrics Stability Dielectric losses Dielectric resonator antennas Bandwidth resonator Anisotropy ceramic dielectric materials dielectric measurements dielectric-resonator antenna (DRA) inhomogeneous media
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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