Antenna apparatus

Abstract From the Canadian patent

In an antenna apparatus in which n dielectric layers .epsilon. ~-.epsilon.~ in dielectric constant are respectively stacked between a ground plate and a major radiating conductor the, thicknesses t~-t~ of the dielectric layers are determined so as to satisfy substantially the following equations: (t~ + t~ + ... + t~)/ (t~/.epsilon.~ + t~ /.epsilon.~ + ... + t~/.epsilon.~ ) = .epsilon.~ and, t~ + t~ + ... + t~ = t~, with respect to a dielectric constant .epsilon.~ of the antenna defined from a desired beam width, and the minimum value t~ of the dielectric layer capable of ensuring desired operation band and low reflection losses in this dielectric constant .epsilon.~.