A broadband balun using metamaterial phase-shifting lines
AuthorAntoniades, Marcos A.
Eleftheriades, G. V.
SourceIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
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A 3-port device that converts a single-ended input to a differential output over a large bandwidth is presented. 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° NRI-MM phase-shifting line along the bottom branch. By independently adjusting the parameters of the two MM lines, the slopes of their phase responses can be matched and therefore a broadband differential output signal is achieved. In addition, the MM balun is compact, occupying only a fraction of the area that a conventional TL balun would occupy. © 2005 IEEE.