Electrical biasing scheme for Liquid-Crystal-based tunable Substrate Integrated Waveguide structures

Prasetiadi, Ananto Eka; Rahmawati, S.; Weickhmann, C.; Nickel, Matthias; Jost, Matthias; Franke, Tobias; Hu, Wenjuan; Maune, Holger; Jakoby, Rolf

doi:10.1109/gemic.2016.7461575

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…This is due to a much thinner LC layer which can be tuned faster with lower voltages. Also, substrate integrated waveguides (SIW) [56,57] will probably play a significant role in the future. The right technology has always to been chosen based on a tradeoff.…”

Section: Discussionmentioning

confidence: 99%

Microwave Liquid Crystal Technology

et al. 2018

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Tunable Liquid Crystal (LC)-based microwave components are of increasing interest in academia and industry. Based on these components, numerous applications can be targeted such as tunable microwave filters and beam-steering antenna systems. With the commercialization of first LC-steered antennas for Ku-band e.g., by Kymeta and Alcan Systems, LC-based microwave components left early research stages behind. With the introduction of terrestrial 5G communications systems, moving to millimeter-wave communication, these systems can benefit from the unique properties of LC in terms of material quality. In this paper, we show recent developments in millimeter wave phase shifters for antenna arrays. The limits of classical high-performance metallic rectangular waveguides are clearly identified. A new implementation with dielectric waveguides is presented and compared to classic approaches.

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Section: Discussionmentioning

confidence: 99%

Microwave Liquid Crystal Technology

et al. 2018

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“…An example of a fully electric biasing method is described in Fig. 2 [6], which utilized fixed voltages V 0 and tunable voltages ± V b . By varying ± V b , both extreme states can be obtained, as well as the intermediate states.…”

Section: Fundamentals Of Lc For Microwave Applicationsmentioning

confidence: 99%

Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology

Prasetiadi

Jost

Schulz

et al. 2018

Int. J. Microw. Wireless Technol.

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Tunable microwave devices will play an important role in future wireless systems, in which high-frequency bands, e.g. millimeter waves, will become promising, due to its huge spectrum availability. At such frequency bands, liquid crystals (LCs) exhibit low microwave loss, which is excellent compared with the other tuning elements. In this paper, LC-based microwave components are fabricated by using low temperature co-fired ceramic technology, allowing the integration of the LC into microwave structures. The first component, the amplitude tuner, controls the signal's amplitude by using the interference concept, which exhibits a tunable attenuation range from 11 dB to 30 dB at 30 GHz. The second component is a 3-pole tunable bandpass filter, which is realized by using a substrate integrated waveguide topology, enabling a device with comparatively high-quality factors (Q-factors). The measurement results show Q-factors in the range of 68 to 100 for a frequency tuning of 29.4–30.1 GHz, i.e. a tuning range of 700 MHz, accompanied by an insertion loss 2 dB to 4 dB.

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“…The biasing structures are realized on a Mylar film with 50 µm thickness. It is based on a quadrupole design [18]- [20] in order to generate the different biasing fields required for aligning the LC. The LC is aligned by electric forces only, because the surface anchoring is not applicable.…”

Section: Beam-steering Phased-array Antennasmentioning

confidence: 99%

Tunable Microwave Component Technologies for SatCom-Platforms

et al. 2017

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Modern communication platforms require a huge amount of switched RF component banks especially made of different filters and antennas to cover all operating frequencies and bandwidth for the targeted services and application scenarios. In contrast, reconfigurable devices made of tunable components lead to a considerable reduction in complexity, size, weight, power consumption, and cost. This paper gives an overview of suitable technologies for tunable microwave components especially for SatCom applications. Special attention is given to tunable components based on functional materials such as barium strontium titanate (BST) and liquid crystal (LC).

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Electrical biasing scheme for Liquid-Crystal-based tunable Substrate Integrated Waveguide structures

Cited by 10 publications

References 6 publications

Microwave Liquid Crystal Technology

Microwave Liquid Crystal Technology

Liquid-crystal-based amplitude tuner and tunable SIW filter fabricated in LTCC technology

Tunable Microwave Component Technologies for SatCom-Platforms

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