60 GHz Reflection Type Phase Shifter based on liquid crystal

Bulja, Senad; Mirshekar‐Syahkal, D.; Yazdanpanahi, M.; James, Richard; Day, SE; Fernández, FA

doi:10.1109/rws.2010.5434253

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…Reconfigurable, adaptive or tuneable microwave devices such as filters, couplers, antennas and phase shifters are required in modern radars as well as in mobile and wireless communication systems. Liquid crystal materials have been shown to be attractive for these applications [1][2][3][4][5][6]. Liquid crystals are liquid anisotropic materials with a tensor permittivity that can be controlled by an external, low-power, low-frequency, low-voltage signal applied across suitably placed electrodes, which can be the same metal elements used in the device for RF waveguiding.…”

Section: Introductionmentioning

confidence: 99%

Accurate modelling for the analysis and design of liquid-crystal-based microwave devices

Seddon

James

Day

et al. 2017

2017 International Workshop on Electromagnetics: Applications and Student Innovation Competition

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Liquid crystal substrates have been shown to provide the means to develop low-cost, reconfigurable, adaptive and tuneable microwave and MM-wave devices for mobile and wireless communication systems. However, techniques for the characterisation of materials, device fabrication and design are necessary in order to take maximum advantage of the possibilities that these materials offer. This includes appropriate modelling methods to simulate accurately the switching behaviour of the liquid crystal and the characteristics of the wave propagation through the devices, taking full consideration of the point-by-point variation of the material tensor permittivity. We describe these techniques here and show their application in the design of a meander-line phase shifter.

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Section: Introductionmentioning

confidence: 99%

Accurate modelling for the analysis and design of liquid-crystal-based microwave devices

Seddon

James

Day

et al. 2017

2017 International Workshop on Electromagnetics: Applications and Student Innovation Competition

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“…This property of nematic LCs has already been exploited for the development of tunable antennas [2] and phase shifters [3].…”

Section: Introductionmentioning

confidence: 99%

“…Microstrip antennas can be divided into two basic types by structure, namely microstrip patch antenna [1][2][3] and microstrip slot antenna [4,5]. Many communication and sensor systems …”

Section: Introductionmentioning

confidence: 99%

Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate

Bulja¹,

Mirshekar‐Syahkal

James

et al. 2013

Micro & Optical Tech Letters

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ABSTRACT:The effective dielectric constant of the top grounded coplanar waveguide with a liquid crystal (LC) superstrate for phase shifting applications is investigated in the frequency range of 30-60 GHz. Two nematic LC mixtures, namely E7 and MDA-00-3506, are used as the superstrate. The measurements show that MDA-00-3506 offers higher values of phase shift per millimeter than its E7 counterpart. In particular, the MDA-00-3506 provides 3.14 /mm, whereas E7 gives 2.79 /mm at 60 GHz. The results of the dielectric constants from measurement and computer modeling are found to agree to within 5%. For the modeling, a comprehensive finite element package predicting the local alignment of LC molecules and effective dielectric constant at different bias voltages and frequencies are used.

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“…Recent publications for applications in the frequency range from 20 to 100 GHz include transmission line-based approaches, tunable loaded lines as well as tunable filters. For more compact phase shifters, the usage of tunable filters [13] or hybrid couplers with tunable loads [14] have been investigated. Periodically loaded lines with LC-based varactors have been realized in coplanar waveguide (CPW) [11] and slotline [12] topology.…”

Section: Introductionmentioning

confidence: 99%

Advanced characterization of a W-band phase shifter based on liquid crystals and MEMS technology

Fritzsch

Giacomozzi

Karabey

et al. 2012

Int. J. Microw. Wireless Technol.

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In this paper, we present a continuously tunable phase shifter realized in MEMS technology. Varactors with liquid crystal as a tunable dielectric layer underneath gold bridges are used to build a loaded line phase shifter. Measurements show that the phase shifter has a differential phase shift of 928, a figure of merit (FoM) of 428/dB and an input matching of 219 dB at 76 GHz.The tuning speed of the phase shifter is measured at different temperatures between 10 and 508C. The realized phase shifter can be used in combination with MEMS switches in order to build a 3608 tunable reflection phase shifter.

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60 GHz Reflection Type Phase Shifter based on liquid crystal

Cited by 13 publications

References 5 publications

Accurate modelling for the analysis and design of liquid-crystal-based microwave devices

Accurate modelling for the analysis and design of liquid-crystal-based microwave devices

Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate

Advanced characterization of a W-band phase shifter based on liquid crystals and MEMS technology

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