RF phase shifter using MEMS switches on a tapered coplanar waveguide
In: Songklanakarin Journal of Science and Technology (SJST), Jg. 34 (2012), Heft 6, S. 645-651
Online
academicJournal
Zugriff:
This paper presents the analysis and design of tapered coplanar waveguide based RF phase shifter using MEMSswitches for microwave and millimeter-wave applications. The equivalent circuit of the phase shifter has been analyzed withthe capacitances of MEMS switches in both up and down states. A control voltage applied between the center conductorand the switch’s membrane actuates it and pulls down the membrane, creating a slow-wave transmission line. The loadingcapacitance gets added up with the line capacitance, thus varying the characteristic impedance of the line. This change inimpedance varies the phase velocity, thereby producing a phase shift. The use of tapered coplanar waveguide as an alternative to the conventional waveguide produces an increase in phase shift per unit length with a small increase in insertion loss.By accurate design of the taper sections, the losses can be reduced further.
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RF phase shifter using MEMS switches on a tapered coplanar waveguide
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Autor/in / Beteiligte Person: | Boothalingam, Nataraj ; Karantharaj, Porkumaran |
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Zeitschrift: | Songklanakarin Journal of Science and Technology (SJST), Jg. 34 (2012), Heft 6, S. 645-651 |
Veröffentlichung: | Prince of Songkla University, 2012 |
Medientyp: | academicJournal |
ISSN: | 0125-3395 (print) |
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