A NRI-TL metamaterial-loaded bow-tie antenna
AuthorAntoniades, Marcos A.
Eleftheriades, G. V.
SourceProceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011
Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011
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A fully-printed and low-profile bow-tie antenna is proposed, which exhibits multi-band performance by loading a bow-tie antenna with series capacitive gaps and shunt inductive strips, to form an asymmetric two unit-cell NRI-TL loaded antenna. It is demonstrated that the resonant behaviour of the antenna can be adjusted by changing its geometrical parameters, which in turn tune the transmission-line and loading parameters of each NRI-TL unit cell. Both quad-band and tri-band versions of the antenna are shown. The tri-band version of the antenna achieves a 10 dB bandwidth of 44 MHz around 1.12 GHz, a bandwidth of 820 MHz, from 2.61 GHz to 3.43 GHz, and a bandwidth of 86 MHz around 6.47 GHz. The low-frequency resonance at 1.12 GHz corresponds to a 48% reduction in the resonant frequency compared to the lowest resonant frequency of the unloaded bow-tie antenna. The antenna has a total size of 50100.79 mm3 or 0.1870.0370.0030 at 1.12 GHz, and throughout the operating bands the gain and efficiency vary from 3.08 dBi to 2.21 dBi and 52% to 96%, respectively. © 2011 EurAAP.