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Novel technique for performance improvement in impedance-transforming planar Marchand baluns

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4 Author(s)
R. Phromloungsri ; Dept. of Telecommun. Eng., Mahanakorn Univ. of Technol., Bangkok, Thailand ; S. Srisathit ; M. Chongcheawchamnan ; I. D. Robertson

A new technique which significantly improves the performance of a microstrip Marchand balun is described in this paper. The technique uses a series capacitor at the unbalanced input port to improve the matching bandwidth and inductors at the ground connections to greatly improve amplitude/phase balance. The technique is demonstrated with experimental results of a 50-150 Ω balun at 900 MHz. The measured results show amplitude/phase tracking within 0.1 dB and 1 degree over a 40% operating bandwidth.

Published in:

2005 European Microwave Conference  (Volume:1 )

Date of Conference:

4-6 Oct. 2005