Patent ID: 6075485
Filing Date: 2000-06-13
Classification: H01Q

Abstract:
An artificial dielectric structure comprising:first and second stacked dielectric layers having first and second permittivities, respectively, said first permittivity being different from said second permittivity,wherein said artificial dielectric structure has a permittivity tensor comprised of permittivity components respectively defined along three principal axes, one of said permittivity components along a certain axis of said principal axes being substantially different than both of the other two of said permittivity components,and wherein said dielectric layers each have substantially parallel top and bottom surfaces and are stacked in a first direction perpendicular to said top and bottom surfaces such that said top surface of said first dielectric layer is adjacent to said bottom surface of said second dielectric layer, said certain axis being parallel to said first direction,and wherein said other two of said permittivity components are greater than said one permittivity component along said certain axis by at least a factor of 5,and wherein said first and second dielectric layers have first and second thicknesses t.sub.1 and t.sub.2, and first and second permittivities .epsilon..sub.r1 and .epsilon..sub.r2 respectively, said first and second thicknesses satisfying the condition that t.sub.n <<1/.beta..sub.n, where .beta..sub.n =.omega..times.sqrt(.mu..sub.0 .epsilon..sub.0 .epsilon..sub.rn) for n=1,2, and .omega.=2.pi.f where f is the maximum operating frequency of said artificial dielectric structure.