Patent ID: 6822622
Filing Date: 2004-11-23
Classification: H01Q

Abstract:
An antenna apparatus, comprising:a first frequency selective surface; and a second frequency selective surface interconnected to said first frequency selective surface such that at least a first portion of said second frequency selective surface overlaps at least a first portion of said first frequency selective surface and such that a distance of said at least a first portion of said second frequency selective surface from said at least a first portion of said first frequency selective surface can be selectively altered, wherein in a first mode said at least a first portion of said second frequency selective surface is a first distance from said at least a first portion of said first frequency selective surface to present a first admittance to a signal having a first frequency, and wherein in a second mode said at least a first portion of said second frequency selective surface is a second distance from said at least a first portion of said frequency selective surface to present a second admittance to said signal having a first frequency.