Miniature 90° and 180° Directional Couplers for Bluetooth and WLAN Applications Designed as Multilayer Microwave Integrated Circuits

This paper presents the designs as well as modeled and measured characteristics of two miniaturized 3-dB directional couplers for wireless applications at 2.45 GHz that provide 90° and 180° phase differences between the output signals. The 90° directional coupler was designed as a branch-line couple...

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Bibliographic Details
Published in:Journal of electromagnetic waves and applications 2011-01, Vol.25 (2-3), p.169-175
Main Authors: Piatnitsa, V., Kholodnyak, D., Fischuk, I., Komulainen, M., Jantunen, H., Vendik, I.
Format: Article
Language:English
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Summary:This paper presents the designs as well as modeled and measured characteristics of two miniaturized 3-dB directional couplers for wireless applications at 2.45 GHz that provide 90° and 180° phase differences between the output signals. The 90° directional coupler was designed as a branch-line coupler with one pair of quarter-wavelength transmission line sections replaced by artificial transmission lines with positive frequency dispersion and another pair of transmission lines replaced by metamaterial transmission lines with negative dispersion. The 180° directional coupler was designed on the basis of the 90° directional coupler by connecting an additional 90° phase shifting network to one of its outputs. Both directional couplers were implemented as fullyintegrated quasi-lumped-element structures in multilayer LTCC packages, fabricated, and experimentally investigated.
ISSN:0920-5071
1569-3937
DOI:10.1163/156939311794362911