A broadband Wilkinson balun using microstrip metamaterial lines

Antoniades, M. A. and Eleftheriades, G. V. (2005) A broadband Wilkinson balun using microstrip metamaterial lines. IEEE Antennas and Wireless Propagation Letters, 4 1: 209-212. doi:10.1109/LAWP.2005.851005


Author Antoniades, M. A.
Eleftheriades, G. V.
Title A broadband Wilkinson balun using microstrip metamaterial lines
Journal name IEEE Antennas and Wireless Propagation Letters   Check publisher's open access policy
ISSN 1536-1225
Publication date 2005
Sub-type Article (original research)
DOI 10.1109/LAWP.2005.851005
Volume 4
Issue 1
Start page 209
End page 212
Total pages 4
Place of publication Piscataway, NJ, United States
Publisher I E E E
Language eng
Formatted abstract A metamaterial balun that converts a single-ended input to a differential output over a large bandwidth is presented. The device also exhibits excellent return loss, isolation, and through characteristics over the same frequency band. The balun comprises a Wilkinson divider, followed by a +90° negative-refractive-index (NRI) metamaterial (MM) phase-shifting line along the top branch, and a -90° MM phase-shifting line along the bottom branch. Utilizing MM lines for both the +90° and -90° branches allows the slopes of their phase responses to be matched, resulting in a broadband differential output signal. The theoretical performance of the balun is verified through circuit simulations and measurements of a fabricated prototype at 1.5 GHz. The MM balun exhibits a measured differential output phase bandwidth (180° ± 10°) of 1.16 GHz (77%), from 1.17 to 2.33 GHz. The measured isolation and return loss for all three ports remain below -10 dB over a bandwidth in excess of 2 GHz, while the output quantities |S 21| and |S31| remain above -4 dB from 0.5 to 2.5 GHz.
Keyword Balun
Broadband
Metamaterial
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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