A Ka-Band Multilayer Beaming-Scanning Antenna Using Liquid Crystals

Li, Xiao Yu; Jiang, Di; Liu, Juan; Tong, Mei Song

doi:10.1109/lawp.2021.3116661

Cited by 17 publications

(5 citation statements)

References 18 publications

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“…These devices require LC layers ranging from several hundred μm to over 1 mm, resulting in decay times of over 100 s. Many studies have reported PAA using LCs in various frequency bands from microwaves to millimeter waves. [9][10][11][12][13][14][15][16] However, the switching times when configuring the beam pattern are not discussed in most of them. Furthermore, there is no report on PAA that satisfies all three conditions: antenna gain greater than 10 dBi, steering angle greater than 60°, and switching times less than 1 s. Nevertheless, these constitute the fundamental prerequisites for effective operation of PAA devices in practical systems.…”

Section: Introductionmentioning

confidence: 99%

Continuously reconfigurable 100 GHz band phased array antenna with improved response time using a microfiber/liquid crystal composite

Lang,

Inoue,

Moritake

2024

Jpn. J. Appl. Phys.

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A 100-GHz band phased array antenna (PAA) based on a microfiber/liquid crystal composite is reported. This antenna features a simple and cost-effective design while delivering outstanding performance. Experimental results demonstrate that our PAA structure exhibits a high gain of nearly 11 dBi, continuous steering across a broad range of approximately 82.5°, and rapid switching times ranging from 80 to 260 ms.

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Section: Introductionmentioning

confidence: 99%

Continuously reconfigurable 100 GHz band phased array antenna with improved response time using a microfiber/liquid crystal composite

Lang,

Inoue,

Moritake

2024

Jpn. J. Appl. Phys.

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“…Recently, various research groups have reported the application of LCs to multiple circuits, such as frequencytunable planar antennas, phase shifters of microstrip and co-planar structures, frequency-tunable filters of waveguide structures, and beamforming array antennas [13], [14], [15], [16], [17], [18], [19], [20], [21], [22]. Several types of research have been conducted to reduce the response time of LC-based RF circuits.…”

Section: Introductionmentioning

confidence: 99%

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

Kim

Saeed

et al. 2023

IEEE Access

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Liquid crystals (LCs) offer a promising playground for developing reconfigurable radio frequency devices due to their unique dielectric properties, including large birefringence and tunability. Previous research on reconfigurable phase shifters has primarily focused on studying loss, response, and tunability. However, the influence of surface-enforced alignment on LC remains an area that requires further exploration. Here, we designed a phase shifter using twisted nematic aligned cells. To characterize the phaseshifting behavior of the nematic LC, we employed the transmission line method within the frequency range of 5 to 8 GHz and extracted the dynamic electrical parameters. Numerical simulations based on finite element methods were conducted to predict the alignment of LC molecules and the propagation of waves within the test cell. The phase shifter achieved a phase difference of ∼220 • by applying a bias voltage to the LC. In particular, we compare the dynamic response of the phase shifter and a twisted LC configuration having a chiral dopant that responds 10 times faster than the homogeneous mode.INDEX TERMS Liquid crystal, dielectric anisotropy, phase shifter, twisted nematic configuration, chiral dopant.DOWON KIM (Member, IEEE) received the M.S. and Ph.D. degrees in electrical engineering from

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“…nematic liquid crystal (LC) exhibits the advantages of low loss and low cost in frequency bands above 10 GHz, which are favorited by tunable phase shifters and electronically steerable antennas [4][5][6]. Most of the LC phase shifters are constructed by conventional transmission lines, such as inverted microstrip line (IMSL) [7][8][9][10][11], coplanar waveguide (CPW) [12,13], and waveguide [14][15][16][17]. The response time of the LC is proportional to the square of the LC thickness between two electrodes [18], suggesting that the LC thickness less than 5 µm is essential for millisecond responsiveness.…”

Section: Introductionmentioning

confidence: 99%

“…The response time of the LC is proportional to the square of the LC thickness between two electrodes [18], suggesting that the LC thickness less than 5 µm is essential for millisecond responsiveness. However, all the conventional transmission line constructed LC phase shifters reported in [7][8][9][10][11][12][13][14][15][16][17] suffer a huge metal loss for that thin thickness [19,20]. Therefore, it has been a pressing issue to achieve a fast response while reducing the metal loss of the LC-based phase shifter.…”

Section: Introductionmentioning

confidence: 99%

Electrically tunable liquid crystal phase shifter with excellent phase shift capability per wavelength based on opposed coplanar waveguide

Wang¹,

Su²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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A tunable liquid crystal (LC) phase shifter based on opposed coplanar waveguide (OCPW) with excellent phase shift capability per wavelength is proposed. The proposed OCPW not only has good transmission characteristics and a quasi-TEM operating mode similar to the CPW, but also avoids the metalized via and complicated bias circuit in designing the phase shifter. Consequently, the phase shifter is easy to fabricate and miniaturize. The main structure of the phase shifter includes two functional components. One is the transition section, in which the flaring grounds and gradient stubs are utilized to realize the impedance and wave-number matching to the OCPW phase shift part; the other is a tunable phase shift section, which is composed of the OCPW centerline and ground with staggered periodic stubs stretching out. To realize tunable phase shifting by applying different DC bias voltages, a DC bias network capable of blocking RF signal is elaborately designed. An equivalent circuit model of the phase shift part is established and represented using the ABCD matrix, so that the relation between the related parameters and the phase shift per wavelength can be easily obtained to guide the design. The measurement results demonstrate that the proposed phase shifter achieves a total of 300° phase shifting, as high as 289°/λ0 phase shift per wavelength, and a good figure-of-merit (FoM) of 59°/dB at 14.5 GHz. The phase shifter features the reflection coefficient less than -10 dB and the transmission coefficient bigger than -6 dB from 9.3 GHz to 15 GHz.

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A Ka-Band Multilayer Beaming-Scanning Antenna Using Liquid Crystals

Cited by 17 publications

References 18 publications

Continuously reconfigurable 100 GHz band phased array antenna with improved response time using a microfiber/liquid crystal composite

Continuously reconfigurable 100 GHz band phased array antenna with improved response time using a microfiber/liquid crystal composite

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

Electrically tunable liquid crystal phase shifter with excellent phase shift capability per wavelength based on opposed coplanar waveguide

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