Microwave characteristics of liquid-crystal tunable capacitors

This letter investigates the microwave characteristics of the liquid crystal tunable capacitors for the first time. With the dielectric anisotropy properties, the liquid crystal capacitors present very different characteristics compared to the semiconductor or MEMS tunable capacitors. A quality fact...

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Bibliographic Details
Published in:IEEE electron device letters 2005-07, Vol.26 (7), p.451-453
Main Authors: Yeh, J.A., Chang, C.A., Chih-Cheng Cheng, Jing-Yi Huang, Hsu, S.S.H.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Applied sciences
Capacitors
Dielectric liquids
Dielectric materials
Dielectric, amorphous and glass solid devices
Electric potential
Electronics
Exact sciences and technology
Frequency
Liquid crystal
Liquid crystals
Micro- and nanoelectromechanical devices (mems/nems)
Micromechanical devices
microwave
Microwaves
Q factor
Quality factor
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Semiconductors
tunable capacitors
Tuning
Voltage
Voltage control
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Summary:This letter investigates the microwave characteristics of the liquid crystal tunable capacitors for the first time. With the dielectric anisotropy properties, the liquid crystal capacitors present very different characteristics compared to the semiconductor or MEMS tunable capacitors. A quality factor of 310 with a control voltage of 5 V was achieved at 4 GHz. A tuning range of 25.3% for the control voltages from 0 to 5 V was obtained at 5 GHz. The results demonstrate the potential applications of liquid crystals as dielectric materials for capacitors with high quality factors and wide tuning ranges at high frequencies, particularly suitable for the future flexible electronics with transparent substrates.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2005.851118