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.


Author Antoniades, M. A.
Eleftheriades, G. V.
Title A broadband Wilkinson balun using microstrip metamaterial lines
Journal name IEEE Antennas and Wireless Propagation Letters  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2005
Sub-type Article
DOI 10.1109/LAWP.2005.851005
Volume number 4
Issue number 1
ISSN 1536-1225
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
Collections: ERA 2012 Admin Only
School of Information Technology and Electrical Engineering Publications
 
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