Design characterization of an electronic steerable Ka-band antenna using liquid crystal phase shifters

Hoehn, A.; Hager, Philipp; Harder, Jan

doi:10.1109/aero.2013.6496965

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…First demonstrators up to K a -band (26.5 GHz to 40 GHz) have been realized in a hollow-waveguide environment [30][31][32]. Figure 28 shows a model of the proposed 4 × 4 antenna array of [30]. Power division is obtained by Y-dividers in a corporate feed arrangement.…”

Section: Phased Array Antennasmentioning

confidence: 99%

Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications

et al. 2020

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This paper presents recent development of tunable microwave liquid crystal (LC) components in the lower millimeter wave (mmW) regime up to the W-band. With the utilization of increasing frequency, conventional metallic waveguide structures prove to be impractical for LC-based components. In particular, the integration of the electric bias network is extremely challenging. Therefore, dielectric waveguides are a promising alternative to conventional waveguides, since electrodes can be easily integrated in the open structure of dielectric waveguides. The numerous subcategories of dielectric waveguides offer a high degree of freedom in designing smart millimeter wave components such as tunable phase shifters, filters and steerable antennas. Recent research resulted in many different realizations, which are analyzed in this paper. The first demonstrators of phased array antennas with integrated LC-based phase shifters are reviewed and compared. In addition, beam steering with a single antenna type is shown. Furthermore, the possibility to realize tunable filters using LC-filled dielectric waveguides is demonstrated.

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Section: Phased Array Antennasmentioning

confidence: 99%

Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications

et al. 2020

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“…In a dielectric material, the optical length that an electromagnetic wave radiates from primary feed O s and refract to the air after being reflected by subreflector to the main reflector's focus is equal. Namely, When θ s is certain, θ m , θ n , f s , f m , and f n can be solved according to (11), (21), (23), (25), and (28).…”

Section: International Journal Of Antennas and Propagationmentioning

confidence: 99%

“…The antenna designers always pursue high gain while using low sidelobes for the design of Ka-band antenna [17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A Ring-Focus Antenna with Splash Plate in Ka-Band

Zhao

Bai

et al. 2018

International Journal of Antennas and Propagation

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A design for Ka-band satellite communication antenna in earth station is introduced. This kind of antenna uses splash plate feed based on ring-focus antenna. The theory of the new splash plate feed design is presented and the relative equations are derived. The measured antenna parameters, VSWR, and patterns are highly consistent with the simulated results, which demonstrates the success of the design for such kind of antenna that can be effectively used in Ka-band applications.

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“…Therefore, developing a simple phase shifter that is cheap, lightweight, and has low power consumption is highly desirable. As a way to meet these requirements, reconfigurable phase shifters using liquid crystals (LCs) have attracted tremendous interest due to their tunable dielectric constant [7], [8], [9], [10], [11]. Since LC has dielectric anisotropy depending on the applied bias voltage, it is…”

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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Design characterization of an electronic steerable Ka-band antenna using liquid crystal phase shifters

Cited by 10 publications

References 5 publications

Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications

Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications

A Ring-Focus Antenna with Splash Plate in Ka-Band

Fast Reconfigurable Phase Shifter Based on a Chiral Liquid Crystal Configuration

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