Improved High-Frequency Performance of Microstrip-Line-Type Liquid Crystal Phase Shifter

A novel microstrip-line (MSL)-type liquid crystal (LC) phase shifter is designed to retain both the ease of fabrication with a coplanar waveguide (CPW)-type LC phase shifter and the excellent phase-shifting properties of the MSL-type one. The converting circuit, which is a key component of the devic...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 52; no. 9; pp. 091701 - 091701-5
Main Authors Nose, Toshiaki, Chien, Liang-Chy, Catanescu, Otilia, Golvin, Andrii, Ito, Yusuke, Sasamori, Takayuki, Isota, Yoji, Ito, Ryouta, Honma, Michinori
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.09.2013
Subjects
Birefringence
Circuits
Converting
Coplanar waveguides
Devices
Liquid crystals
Performance enhancement
Phase shifters
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Summary:A novel microstrip-line (MSL)-type liquid crystal (LC) phase shifter is designed to retain both the ease of fabrication with a coplanar waveguide (CPW)-type LC phase shifter and the excellent phase-shifting properties of the MSL-type one. The converting circuit, which is a key component of the device, is optimized so as to improve the operating frequency. Then, the phase-shifting properties and loss phenomena are investigated by using various LC materials. The operational frequency is extremely improved by employing a novel large birefringence LC material and the optimized design.
Bibliography:(Color online) Structure of the novel MSL-type LC phase shifter. (Color online) Simulation model of FDTD calculation. (Color online) Simulation results of (a) reflection and (b) transmission properties for various distances between through-hole and signal electrode. (Color online) Optimized design of the MSL-type LC phase shifter, which can operate up to the MMW region. Signal electrode widths of normal MSL and I-MSL are 2.4 and 0.6 mm, respectively. Separation between meander electrodes is set at 1.1 mm, and the bend span along the vertical direction in this figure is 10 mm. The length of each conversion circuits is 5 mm. (Color online) Measurement results of transmission properties of the device for various LC materials. (Color online) Measured phase-shifting properties for various LC materials. (Color online) Evaluation results of device performance by using FOM.
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content type line 23
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.091701