NDLI: Ferroelectric- and liquid crystal- tunable microwave phase shifters

Content Provider	IEEE Xplore Digital Library
Author	Weil, C. Muller, S. Scheele, P. Kryvoshapka, Y. Lussem, G. Best, P. Jakoby, R.
Copyright Year	2003
Description	Author affiliation: Adv. Ferrite Technol. GmbH, Backnang, Germany (Weil, C.)
Abstract	This paper introduces two different low-cost, voltage-controlled tunable phase shifter devices based on (1) coplanar waveguide on a ferroelectric thick film ceramics and Al/sub 2/O/sub 3/-microwave substrate and (2) inverted-microstrip line with standard and novel liquid crystal (LC) in-between. For the first type, the differential phase shift can be controlled continuously and exceeds 360/spl deg/ at 38 GHz for a maximum dc voltage of 100 V, corresponding to an electrical field strength of 3.3 V//spl mu/m. The best phase shifter figure-of-merit values, i.e. the quotient of differential phase shift and insertion loss, amounts to 15 to 28/spl deg//dB at 24 GHz for a maximum field strength of 10 V//spl mu/m. This can be increased up to 50/spl deg//dB at 24 GHz for very high field strengths above 20 V//spl mu/m. In contrast, with comparatively low control voltage of 40 V (0.18 V//spl mu/m), the figure-of-merit of the LC type phase shifter amounts to 16/spl deg//dB at 20 GHz for a standard nematic LC K15 and 68/spl deg//dB for an advanced LC mixture.
Starting Page	1431
Ending Page	1434
File Size	334272
Page Count	4
File Format	PDF
ISBN	1580538347
DOI	10.1109/EUMC.2003.177757
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-07
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	EUMA
Subject Keyword	Phase shifters Liquid crystal devices Voltage control Liquid crystals Microwave devices Coplanar waveguides Liquid waveguides Ferroelectric materials Thick films Ceramics
Content Type	Text
Resource Type	Article

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