Liquid crystal-based tunable CRLH-transmission line for leaky wave antenna applications at Ka-Band

Roig, María; Maasch, Matthias; Damm, Christian; Jakoby, Rolf

doi:10.1017/s1759078714000294

Cited by 17 publications

(10 citation statements)

References 20 publications

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“…The CST Microwave Studio software is used for full wave simulation to the microstrip‐waveguide conversion mechanism based on LC. In the simulations, the LC material is set to dielectric anisotropy, where ε ⊥ = 2.43, ε ∥ = 3.22, and the loss tangent tan δ = 0.0066, which is derived from the TUD‐649 produced by Merck Corporation . The substrate is chosen to be Rogers 4350B, with a dielectric constant of 3.66 and a thickness of 0.8 mm.…”

Section: Design and Simulation Of Electronically Controlled Beam Steementioning

confidence: 99%

“…Meanwhile, the stability of glass is poor; thus it is difficult to be widely applied on equipments with requirements of high stability. In addition, due to the variable range of dielectric constant of LC, the tunable range of LC‐based antenna is wide in millimeter wave and THz band; however, in relatively low frequency band, the LWA based on LC cannot achieve satisfactory scanning range …”

Section: Introductionmentioning

confidence: 99%

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Electronically controlled beam steering leaky wave antenna in nematic liquid crystal technology

Wang

Meng

et al. 2020

Int J RF Microw Comput Aided Eng

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A novel nematic liquid crystal (LC) technology-based electronically controlled leaky wave antenna (LWA) with microstrip-waveguide conversion working mechanism and wide beam steering range is presented in this article. The LWA is a combination of an inverted microstrip structure and rectangular waveguide. According to the characteristics of LC materials in microwave band, a broadband microstrip-waveguide conversion device is proposed. The gradient slot leaky wave structure is combined with the microstrip-waveguide conversion device to form an electronically controlled LWA with continuous tunable beam. Simulation and experiment results show that the LWA proposed in this article has a 32 beam scanning range at 12 GHz and good impedance matching and stable gain, suggesting the great potential of nematic LC materials for extensive applications in microwave band in the future. K E Y W O R D S beam steering, leaky wave antenna (LWA), liquid crystal (LC), microstrip-waveguide conversion, nematic

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Section: Design and Simulation Of Electronically Controlled Beam Steementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronically controlled beam steering leaky wave antenna in nematic liquid crystal technology

Wang

Meng

et al. 2020

Int J RF Microw Comput Aided Eng

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“…Liquid crystal is mainly used in microwave circuit to build liquid crystal circuit. New liquid crystal transmission lines such as substrate integrated waveguide [13] and CRLH-transmission line [14] have also been proposed.…”

Section: Theory Of Liquid Crystal a Theory Of Liquid Crystal Micmentioning

confidence: 99%

Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

Jiang

et al. 2020

IEEE Access

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In this paper, a wideband band-pass frequency tunable filter using liquid crystal is proposed for millimeter-wave applications, which achieves the band-pass characteristics by introducing four transmission zeros. The main filter structure is the ring resonator loaded with two quarter-wavelength open stubs using inverted microstrip structure. The ring resonator contacts directly with the liquid crystal layer to control the bias voltage to adjust the dielectric constant of the liquid crystal material. Experimental results show that the central frequency reconstruction range varies from 27.7GHz to 24.6GHz, and the corresponding relative bandwidth changes from 48.17% to 49.82%. The group delay within the pass-band is less than 0.45ns before and after the filter reconstruction, which indicates its applicability in K-band filter. INDEX TERMS Wideband bandpass filter, tunable, liquid crystal, ring resonator.

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“…For the final LWA prototype, the length of the NiCr lines decreases to 10.98 mm which leads to a resistance of 73.2 kΩ. The effect of these NiCr lines on the antenna beam scanning performance can be neglected [17].…”

Section: Materials and Components Tunability Considerationsmentioning

confidence: 99%

Investigation and application of a liquid crystal loaded varactor in a voltage tunable CRLH leaky-wave antenna at Ka-band

Roig

Maasch

Damm

et al. 2015

Int. J. Microw. Wireless Technol.

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In this work, a voltage tunable interdigital capacitor loaded with liquid crystal (LC) is investigated and its application for a composite right/left-handed leaky-wave antenna (LWA) is demonstrated. The tuning capability of the varactor is confirmed by simulation and measurement. A material tunability of 25% of the used LC yields a measured varactor tunability of 9%. Based on this, a tunable LWA with a beam scanning of 14 degrees at 26.7 GHz is implemented and measured.

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Liquid crystal-based tunable CRLH-transmission line for leaky wave antenna applications at Ka-Band

Cited by 17 publications

References 20 publications

Electronically controlled beam steering leaky wave antenna in nematic liquid crystal technology

Electronically controlled beam steering leaky wave antenna in nematic liquid crystal technology

Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

Investigation and application of a liquid crystal loaded varactor in a voltage tunable CRLH leaky-wave antenna at Ka-band

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