2008
DOI: 10.1143/jjap.47.3564
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Large Microwave Birefringence Liquid-Crystal Characterization for Phase-Shifter Applications

Abstract: This work is concerned with the improvement of a microwave liquid-crystal phase shifter using a large birefringence nematic liquid crystal. This material is a eutectic mixture of isothiocyanatotolane molecules. Microwave dielectric properties are reported and compared to the data obtained with the 5CB cyanobiphenyl material in the 26 -40 GHz frequency range using a rectangular waveguide. The phase-shifter design consists of a central cavity, where a liquid crystal is inserted, and two coplanar strip lines acce… Show more

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Cited by 37 publications
(19 citation statements)
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“…The ability for destabilizing the smectic A phase is strongly related to the position of its substituents. For double substituted compounds, the following relation is observed: 3,3′ (33) < 3,5(32) < 2′,3′ (34).…”
Section: Therphenyl Derivativesmentioning
confidence: 90%
See 1 more Smart Citation
“…The ability for destabilizing the smectic A phase is strongly related to the position of its substituents. For double substituted compounds, the following relation is observed: 3,3′ (33) < 3,5(32) < 2′,3′ (34).…”
Section: Therphenyl Derivativesmentioning
confidence: 90%
“…They are connected with telecommunication devices needs or nondestructive microwaves apparatus to control goods and people [19], cholesteric lasers [20,21], manufacturing tunable metamaterial [22][23][24][25]. Different devices such as tunable spatial modulators for light and laser beam steering and for holography [26][27][28][29][30][31][32][33], switchable phase shifters [34][35][36], various types of tunable filters which select or remove bands [37][38][39][40], tunable capacitors [41], antennas [42], lenses [43,44] were manufactured, and others such as photonic fiber [45] (see also, for more information, reviewed papers [46,47]). For these purposes, different high birefringence materials from 0.2 to more than 0.5 are now available [48][49][50][51][52], but further development and improvement of their properties is still necessary.…”
Section: Applications Of High Birefringence Liquid Crystals (Lcs)mentioning
confidence: 99%
“…Reconfigurable microwave varactors , filters, phase inverters for phase array antennas are described in [2][3][4] for the first time. It was noticed that the permittivity change r under a change of an external field strength can be used for a phase control which can achieve 12 º/dB.…”
Section: Introductionmentioning
confidence: 99%
“…[5][6][7][8] However, only a few applications for non-optical applications have been described until now and mainly related to microwave region. [9][10][11][12] As it is well known, the capacitance value for a plane capacitor is given by the following expression:…”
mentioning
confidence: 99%
“…The VCO implemented is based on relaxation configuration and may generate a square wave. Thus, the operational 220 k R 3 1 k R 4 1 k R 5 1 k R 6 1 k R 7 50 k R 8 10 k R 9 2 k R 10 2 k R 11 1 k C 2 1 nF amplifier OP 2 , as shown in Figure 2, operates as a comparator, with no negative feedback. Resistors R 1 , R 2 , and R 3 and the capacitance of the TN LC cell determine the frequency of the output signal.…”
mentioning
confidence: 99%