Abstract

In this work the concept of a Fresnel zone antenna for dual-band detection in the IR and millimeter wave region is presented. The design is based on a Fresnel zone plate lens in the IR that is transformed to serve as a millimeter-wave antenna. Two different designs are presented, a circular-zone design that gives a high diffractive efficiency in the IR and a square-zone design that gives a higher response in the millimeter band but a lower focusing efficiency in the IR. Both designs have an operation bandwidth with the same low frequency limit of $400\mathrm{GHz}$ $\left(750\mu \mathrm{m}\right)$, which can be tailored by changing the number of Fresnel zones, and a high frequency limit of $4.5\mathrm{THz}$ $\left(65\mu \mathrm{m}\right)$ for the circular-zone design and $5\mathrm{THz}$ $\left(59\mu \mathrm{m}\right)$ for the square-zone design.

© 2009 Optical Society of America

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