Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A conical double-dielectric phase-reversal Fresnel-zone plate (FZP) lens is introduced. We present the lens design equations as functions of cone opening angle. As an example, the phase-reversal lens has been applied to four millimeter-wave antennas with different lens opening semi-angles: 45<formula formulatype="inline"><tex>$^{\circ}$</tex></formula>, 60<formula formulatype="inline"> <tex>$^{\circ}$</tex></formula>, and 75<formula formulatype="inline"><tex>$^{\circ}$</tex> </formula> (conical lenses) and 90<formula formulatype="inline"><tex>$^{\circ}$</tex> </formula> (plane lens). The radiation characteristics of these antennas have been calculated and contrasted one-to-another, and to those with the same semi-angles and linear dimensions binary (half-open) FZP lens antennas. The double-dielectric FZP conical arrangement can serve as a conical antenna lens and a radome simultaneously. </para>
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