TY - JOUR
T1 - A broadband monopole antenna enabled by an ultrathin anisotropic metamaterial coating
AU - Jiang, Zhi Hao
AU - Gregory, Micah D.
AU - Werner, Douglas H.
N1 - Funding Information:
Manuscript received October 20, 2011; revised November 28, 2011; accepted December 09, 2011. Date of publication December 20, 2011; date of current version January 30, 2012. This work was supported in part by the NSF MRSEC under Grant DMR-0213623.
PY - 2011
Y1 - 2011
N2 - A new type of compact flexible anisotropic metamaterial (MM) coating is proposed, which greatly enhances the impedance bandwidth of a quarter-wave monopole to over an octave. The MM coating has a high effective permittivity for the tensor component oriented along the direction of the monopole. By properly choosing the radius and tensor parameter of the MM coating, another resonance at a higher frequency can be efficiently excited without affecting the fundamental mode of the monopole. Additionally, the similar current distributions on the monopole at both resonances make stable radiation patterns possible over the entire band. To experimentally verify the concept, an S-band MM coated monopole was designed, fabricated, and characterized, exhibiting a 2.14:1 bandwidth (2.15-4.6 GHz) with a VSWR of less than 2:1. The demonstrated MM coating has a radius of only λ and extremely light weight, which renders it attractive for use in applications such as broadband arrays and portable wireless devices.
AB - A new type of compact flexible anisotropic metamaterial (MM) coating is proposed, which greatly enhances the impedance bandwidth of a quarter-wave monopole to over an octave. The MM coating has a high effective permittivity for the tensor component oriented along the direction of the monopole. By properly choosing the radius and tensor parameter of the MM coating, another resonance at a higher frequency can be efficiently excited without affecting the fundamental mode of the monopole. Additionally, the similar current distributions on the monopole at both resonances make stable radiation patterns possible over the entire band. To experimentally verify the concept, an S-band MM coated monopole was designed, fabricated, and characterized, exhibiting a 2.14:1 bandwidth (2.15-4.6 GHz) with a VSWR of less than 2:1. The demonstrated MM coating has a radius of only λ and extremely light weight, which renders it attractive for use in applications such as broadband arrays and portable wireless devices.
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U2 - 10.1109/LAWP.2011.2180503
DO - 10.1109/LAWP.2011.2180503
M3 - Article
AN - SCOPUS:84856968756
SN - 1536-1225
VL - 10
SP - 1543
EP - 1546
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
M1 - 6109305
ER -