A folded-monopole model for electrically small NRI-TL metamaterial antennas

Antoniades, M. A. and Eleftheriades, G. V. (2008) A folded-monopole model for electrically small NRI-TL metamaterial antennas. IEEE Antennas and Wireless Propagation Letters, 7 Article # 2008773: 425-428. doi:10.1109/LAWP.2008.2008773

Author Antoniades, M. A.
Eleftheriades, G. V.
Title A folded-monopole model for electrically small NRI-TL metamaterial antennas
Journal name IEEE Antennas and Wireless Propagation Letters   Check publisher's open access policy
ISSN 1536-1225
Publication date 2008
Sub-type Article (original research)
DOI 10.1109/LAWP.2008.2008773
Volume 7
Issue Article # 2008773
Start page 425
End page 428
Total pages 4
Place of publication Piscataway, NJ, United States
Publisher I E E E
Language eng
Formatted abstract
An improved model for analyzing electrically small NRI-TL antennas is proposed, that highlights the methods that enable these antennas to offer a good impedance match and a high radiation efficiency compared to previously reported designs. An even-odd mode analysis reveals that the antenna supports a predominately even-mode current on the vertical vias, allowing the antenna to be modeled using a multiple folded monopole topology, which provides a substantial increase in the radiation resistance of the antenna. This, together with the top-loading effect of the microstrip line on the vias, enables the antenna to be matched to 50 ω without the use of an external matching network, while maintaining a high radiation efficiency. The validity of the proposed model is confirmed with a fabricated prototype, that consists of four microstrip zero-degree NRI-TL unit cells with dimensions of λ0/10 × λ0/10 × λ0/20 over a 0.45λ0 × 0.45λ0 ground plane. The antenna's performance is verified by full-wave simulations and experimental data obtained at 3.1 GHz, which yield a vertical linear electric field polarization, a measured -10 dB return-loss bandwidth of 53 MHz and a measured efficiency of 70%.
Keyword Electrically small antennas
Folded monopole
Negative refractive index
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: ERA 2012 Admin Only
School of Information Technology and Electrical Engineering Publications
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Created: Fri, 02 Dec 2011, 16:21:34 EST by Ms Deborah Brian on behalf of School of Information Technol and Elec Engineering