DocumentCode :
3605017
Title :
Free-Space Focusing at C-Band Using a Flat Fully Printed Multilayer Metamaterial Lens
Author :
Das, Sanghamitro ; Hoang-Linh Nguyen ; Babu, G. Naveen ; Iyer, Ashwin K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, AB, Canada
Volume :
63
Issue :
11
fYear :
2015
Firstpage :
4702
Lastpage :
4714
Abstract :
A volumetric metamaterial lens exhibiting a negative refractive index (NRI) at C-band is designed and its free-space focusing properties are experimentally verified. The designed lens employs a multilayer geometry and its unit cells are loaded using metal-insulator-metal (MIM) capacitors and dual-arm spiral inductors in a biplanar configuration. These elements, although fully printed and without vias, provide strong reactive loading that enables a unit cell size of λo/11$ and allows the metamaterial´s dispersion properties to be accurately modeled in the effective-medium regime using an equivalent-circuit approach. It is also conducive to implementation at high frequencies, where surface-mount components are unusable. The focusing properties of the fabricated lens are confirmed for a band of frequencies around 5.0 GHz in an anechoic chamber using a free-space field probing system consisting of electrically small shielded-loop antennas affixed to a computer-controlled scanner.
Keywords :
MIM devices; anechoic chambers (electromagnetic); capacitors; equivalent circuits; lenses; loop antennas; microwave metamaterials; C-band; MIM capacitor; NRI; anechoic chamber; biplanar configuration; computer-controlled scanner; dispersion property; dual-arm spiral inductor; electrically small shielded-loop antenna; equivalent-circuit approach; free-space field probing system; free-space focusing property; metal-insulator-metal capacitor; negative refractive index; printed multilayer metamaterial lens; reactive loading; surfacemount component; volumetric metamaterial lens; Capacitance; Capacitors; Inductors; Loading; Metamaterials; Nonhomogeneous media; Spirals; Focusing; focusing; left-handed; lenses; metamaterial; negative refractive index (NRI); periodic structures; transmission line;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.2015.2474154
Filename :
7226793
Link To Document :
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