Variable directional coupler employing microfluidics

Niyogi, S, Scott, J and Ghorbani, K 2008, 'Variable directional coupler employing microfluidics', in Peter Hoogeboom (ed.) Proceedings of the 38th European Microwave Conference, Amsterdam, Netherlands, 27-31 October 2008, pp. 207-210.


Document type: Conference Paper
Collection: Conference Papers

Title Variable directional coupler employing microfluidics
Author(s) Niyogi, S
Scott, J
Ghorbani, K
Year 2008
Conference name 38th European Microwave Conference
Conference location Amsterdam, Netherlands
Conference dates 27-31 October 2008
Proceedings title Proceedings of the 38th European Microwave Conference
Editor(s) Peter Hoogeboom
Publisher EuMA
Place of publication Netherlands
Start page 207
End page 210
Total pages 4
Abstract This paper details a novel variable directional coupler based on a broadside coupled stripline structure employing microfluidics. The coupler has shown good bandwidth of 7.5-12.5 GHz with only a single quarter wavelength section. The variable coupling has been achieved by creating chambers in the dielectric material between the two coupled strips. The chambers have the same length and width as the coupled strips. Conductive fluid is pumped in and out of each chamber leading to a change in coupling between the broadside coupled strips. Conductive fluids like the solution of ammonium chloride or potassium chloride have been used to change the conductivity of the chamber which provides the coupling variation. The chambers are isolated from each other by thin membranes. The fabrication is compatible with MIC techniques. A coupling variation of 24 dB to 11 dB has been obtained. The return loss characteristics at all ports are better than 15 dB.
Subjects Microwave and Millimetrewave Theory and Technology
Copyright notice © 2008 EuMA
ISBN 9782874870064
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