1. IntroductionIn recentyears,mater

1. Introduction
In recentyears,materialsabsorbingelectromagneticwave
(EMW) haveattractedworldwideattentionasaresultofthe
developmentofradar-absorbingtechnology [1]. Siliconcar-
bide (SiC)ceramicisagoodselectiontofabricateEMW
absorptionmaterialsbecauseofitswidebandgapandpractical
applicationsinsevereenvironments.However,ithasbeen
demonstratedthatthelowelectricalconductivityofpureSiC
results inlowdielectricloss [2], suchasSiCpowders [3], SiC
foams [4], andSiCmatrixcomposites [5]. Inourprevious
work [6], porousSi3N4–SiC compositeceramicswith11vol%
SiC wasfabricated,whichachievedaminimumreflectionloss
of
6.7 dBat12.2GHz.Nonetheless,thedielectricproperties
of CVISiCalsoneedtobeimproved.
Changing theconductivityofSiCbydopingisaneffective
way toimproveitsdielectricproperties [7]. Itwasreportedthat