Antennas represent a critical technology in any of these
wireless systems. Not only do they directly affect the received
power of the system, they are also typically the largest and most
visible part. Recently, the need for low-cost, low-profile, and
lightweight antenna in the frequency range of the
microwave/millimeter wave/THz band has regained momentum.
"Basic Principles of Fresnel Antenna Arrays" provides us a with
the basics of the various Fresnel Antenna approaches, in order to
achieve low-cost, low-profile, and lightweight antenna in the
microwave/millimeter wave band. A potential solution of the antenna
problem lies in using lens technology in an array. The Fresnel zone
plate lens (FZPL) antenna is in particular an interesting candidate
for the array element. The limiting focusing properties of FZPL
including subwave length focus are described in detail. The book
further presents a novel hexagonal FZPL antenna which can be more
effectively packed in an array due to its shape.
Before considering the hexagonal FZPL antenna in an array, the
authors investigate two ideas, described as methods to potentially
improve the radiation characteristics. The first idea is to change
the reference phase of the Fresnel zone radii - a novel free
parameter in the usual design of zone plate's lenses and antennas.
To further improve the radiation characteristics of the hexagonal
FZPL antenna, a technique involving Fresnel zone rotation is
investigated.
The book is of interest for designers of optical systems
because, taking scaling effects into account, the characteristics
of diffractive quasioptical elements are valid for diffractive
focusing elements of integrated optics.
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