Patent ID: 6774867
Filing Date: 2004-08-10
Classification: H01Q

Abstract:
An artificial magnetic conductor (AMC) resonant with a substantially zero degree reflection phase over at least two resonant frequency bands, the artificial magnetic conductor comprising a frequency selective surface characterized by a plurality of Lorentz resonant frequencies in transverse permittivity at independent, non-harmonically related, predetermined frequencies different from the resonant frequency bands, wherein the frequency selective surface has a transverse permittivity &egr;1t defined by &varepsilon;1&it;x=&varepsilon;1&it;y=Y&it;(Ï‰)j&it;â€ƒ&it;Ï‰&it;â€ƒ&it;&varepsilon;0&it;t,wherein Y(&ohgr;) is a frequency dependent admittance function for the frequency selective surface, j is the imaginary operator, &ohgr; corresponds to angular frequency, &egr;0 is the permittivity of free space, and t corresponds to thickness of the frequency selective surface.