Tunable composite right/left-handed leaky wave antenna based on a rectangular waveguide using liquid crystals

Damm,; Maasch,; Gonzalo,; Jakoby,

doi:10.1109/mwsym.2010.5515388

Cited by 12 publications

(11 citation statements)

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“…The use of liquid crystal has been reported for the development of leaky-wave antennas able to steer their main beam direction at a fixed frequency. In [45], a leaky-wave antenna based on composite right/left-handed waveguide was described, with beam steering at 7.6 GHz. Through application of either 6 International Journal of Antennas and Propagation a static electric or magnetic field to the liquid crystal molecules, a beam tilt of around ±10 ∘ was achieved.…”

Section: Beammentioning

confidence: 99%

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Yaghmaee

Karabey

Bates

et al. 2013

International Journal of Antennas and Propagation

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An overview of liquid crystal technology for microwave and millimeter-wave frequencies is presented. The potential of liquid crystals as reconfigurable materials arises from their ability for continuous tuning with low power consumption, transparency, and possible integration with printed and flexible circuit technologies. This paper describes physical theory and fundamental electrical properties arising from the anisotropy of liquid crystals and overviews selected realized liquid crystal devices, throughout four main categories: resonators and filters, phase shifters and delay lines, antennas, and, finally, frequency-selective surfaces and metamaterials.

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Section: Beammentioning

confidence: 99%

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Yaghmaee

Karabey

Bates

et al. 2013

International Journal of Antennas and Propagation

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“…However, for many applications beam steering is desirable at a fixed frequency. The waveguide-based LWA prototype presented in [16] proves this concept at an operation frequency of 7.6 GHz using a magnetic biasing scheme. The poor performance of these semiconductor varactors at high frequencies has a big impact on the antenna efficiency and thus, limits the operation frequency to about 7 GHz.…”

Section: Introductionmentioning

confidence: 80%

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

Roig

Maasch

Damm

et al. 2014

Int. J. Microw. Wireless Technol.

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Liquid crystal-based tunable CRLH-transmission line for leaky wave antenna applications at Ka-Band mari 'a roig, matthias maasch, christian damm and rolf jakobyIn this work, a liquid crystal based tunable composite right/left-handed transmission line for future leaky wave antennas working at the Ka-band is presented. The tuning of the liquid crystal is achieved by means of magnetic and electric biasing. For this purpose, different prototypes are fabricated for each biasing technique and their dispersive characteristics compared. Electric tunability is achieved by implementing highly resistive bias lines in the unit cell layout. Both techniques yield similar tuning capabilities at the operation frequency of 27GHz whereas the electric one has the advantage of being easily integratable in the layout.

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“…Since the capacitance of varactor diodes and liquid crystals can be changed by different biased voltage, the mutual inductance of the cELC and the radiation amplitude of the element can be changed continuously. The unique advantage of liquid crystals is that they show linear properties and work well in high-frequency bands, overcoming the nonlinearities of PIN diodes and varactor diodes caused by the increasing parasitic resistance in high-frequency bands [13].…”

Section: Fabrication Methodologies and Full-wave Analysis Of Reconfig...mentioning

confidence: 99%

Reconfigurable Holographic Surfaces for Future Wireless Communications

Deng¹,

Di²,

Zhang³

et al. 2021

Preprint

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Future wireless communications look forward to constructing a ubiquitous intelligent information network with high data rates through cost-efficient devices. Benefiting from the tunability and programmability of metamaterials, the reconfigurable holographic surface (RHS) composed of numerous metamaterial radiation elements is developed as a promising solution to fulfill such challenging visions. The RHS is more likely to serve as an ultra-thin and lightweight surface antenna integrated with the transceiver to generate beams with desirable directions by leveraging the holographic principle. This is different from reconfigurable intelligent surfaces (RISs) widely used as passive relays due to the reflection characteristic. In this article, we investigate RHS-aided wireless communications. Starting with a basic introduction of the RHS including its hardware structure, holographic principle, and fabrication methodologies, we propose a hybrid beamforming scheme for RHS-aided multi-user communication systems. A joint sum-rate maximization algorithm is then developed where the digital beamforming performed at the base station and the holographic beamforming performed at the RHS are optimized iteratively. Furthermore, key challenges in RHS-aided wireless communications are also discussed.

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Tunable composite right/left-handed leaky wave antenna based on a rectangular waveguide using liquid crystals

Cited by 12 publications

References 0 publications

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

Electrically Tuned Microwave Devices Using Liquid Crystal Technology

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

Reconfigurable Holographic Surfaces for Future Wireless Communications

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