Microwave dielectric loss characterization of silicon carbide wafers

Timothy Bogart, Bill Everson, Rick Gamble, Ed Oslosky, David Snyder, Eugene Furman, Steve Perini, Michael Lanagan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Semi-insulating silicon carbide (SiC) wafers are important as substrates for high frequency devices such as AlGaN-GaN HEMT's. A nondestructive characterization technique has been developed to measure the dielectric properties of SiC wafers in the GHz frequency range where the devices will operate in order to validate wafers for high yield working devices. The dielectric loss is measured at approximately 16 GHz in a split microwave cavity. Initial results show a correlation where the dielectric loss decreases as the resistivity increases, where the resistivity was measured using a Contactless Resistivity Mapping system (COREMA). The uniformity of dielectric loss across SiC wafers was evaluated using a split post dielectric resonator cavity fixed at 5.5GHz to measure the dielectric loss at five points on a wafer. Dielectric loss as a function of temperature from room temperature to 400°C was also studied.

Original languageEnglish (US)
Title of host publicationSilicon Carbide and Related Materials 2005, - Proceedings of the International Conference on Silicon Carbide and Related Materials 2005
PublisherTrans Tech Publications Ltd
Number of pages4
EditionPART 1
ISBN (Print)9780878494255
StatePublished - Jan 1 2006
EventInternational Conference on Silicon Carbide and Related Materials 2005, (ICSCRM 2005) - Pittsburgh, PA, United States
Duration: Sep 18 2005Sep 23 2005

Publication series

NameMaterials Science Forum
NumberPART 1
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


OtherInternational Conference on Silicon Carbide and Related Materials 2005, (ICSCRM 2005)
Country/TerritoryUnited States
CityPittsburgh, PA

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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