Reconfigurable dual-band metamaterial antenna based on liquid crystals

Che, Bang-Jun; Meng, Fan‐Yi; Lyu, Yue-Long; Wu, Qun

doi:10.1088/1361-6463/aab755

Cited by 23 publications

(14 citation statements)

References 38 publications

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“…For the aforementioned purposes, the requirements and methodologies of antenna design are also revised [ 3 ]. To meet this ever-increasing requirement of current 5G and future 6G communication systems, compact antennas with multiple bands, low profile, high data rate, and ultra-wideband that are geometrically simple for mass production are required [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Metamaterials and Their Application in the Performance Enhancement of Reconfigurable Antennas: A Review

et al. 2023

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Metamaterials exhibit properties in terms of subwavelength operation or phase manipulation, among others, that can be used in a variety of applications in 5G communication systems. The future and current 5G devices demand high efficiency, high data rate, computational capabilities, cost-effectiveness, compact size, and low power consumption. This variation and advancement are possible when the antenna design is revised to operate over wideband, high gain, and multiband and has characteristics of compact size, reconfiguration, absorption, and simple ease of fabrication. The materials loaded with antennas or, in the same cases, without antennas, offer the aforementioned characteristics to bring advancement in order to facilitate users. A number of works on designing metasurfaces capable of improving bandwidth, gain efficiency, and reducing the size and cost of antennas are available in the literature for this purpose. Not only are these applications possible, but the intelligent metasurfaces are also designed to obtain reconfiguration in terms of frequency and polarization. The number of absorbers loaded with metamaterials is also designed to improve the absorption percentage used for radar applications. Thus, in this paper, the general overview of different types of metamaterials and their role in performance enhancement and application in 5G and 6G communication systems is discussed.

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Section: Introductionmentioning

confidence: 99%

Metamaterials and Their Application in the Performance Enhancement of Reconfigurable Antennas: A Review

et al. 2023

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“…A microstrip reflectarray antenna is composed of a periodic set of resonator elements and a feed source. A phase shifter is used for each resonator element to adjust the scattering phase of each element to the incident wave, thereby realizing a beam-steering function [16], [17]. Conventional reflective array antennas achieve the phase compensation by controlling the structure of the resonance unit, and therefore, cannot provide a versatile beam-steering mechanism.…”

Section: Introductionmentioning

confidence: 99%

Electronically Tunable Liquid-Crystal-Based F-Band Phase Shifter

et al. 2020

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We propose an F-band phase shifter based on the nematic liquid crystals (NLCs). The proposed phase shifter is formed by a voltage-controlled cavity through introducing an NLC layer between a dipole structure array and a metal floor. Under the action of electric field, the orientation of the NLC molecules will be deflected. We adjust the resonant frequency and phase of the reflected electromagnetic (EM) wave by tuning the permittivity. The transmission characteristics and the LC parameters are calculated and analyzed for EM waves within the frequency range from 85 to 115 GHz. The LC-based device with a 30 × 30 array of two parallel unequal dipoles is printed on a quartz substrate, with 4 cm × 4 cm area and 490 µm thickness. The experimental results show that phase shift of zero to 350.7 • is achieved at 104.2 GHz by changing the applied bias voltage on the LC layer from 0 to 20 V. Considering the anisotropy and inhomogeneity of the LC, an improved electrification model is established and compared with the test results. The proposed phase shifter is expected to find several applications in millimeter wave and terahertz reconfigurable antenna systems.

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“…In Reference , by placing an H‐shaped and a square split‐ring structure vertically at the aperture of a horn antenna, the beam can be steered up to +10° with a drop in the gain of 0.48 dB. The liquid crystal extended composite right/left‐handed (E‐CRLH) MM structure is arranged in layers for performing the beam tilting in two directions using tunable liquid crystal and an external voltage …”

Section: Introductionmentioning

confidence: 99%

“…The liquid crystal extended composite right/left-handed (E-CRLH) MM structure is arranged in layers for performing the beam tilting in two directions using tunable liquid crystal and an external voltage. 26 In this article, the planar antenna is incorporated with lowloss adjacent square-shaped resonator (ASSR) structure for beam-tilting applications at the 5G band of 3.5 GHz. An array of 6 × 7 ASSR unit cells has been embedded onto the same substrate of the proposed antenna along the azimuth plane to achieve the positive and negative deflection angles.…”

Section: Introductionmentioning

confidence: 99%

Planar antenna beam deflection using low‐loss metamaterial for future 5G applications

Esmail

Majid

Dahlan

et al. 2019

Int J RF Microw Comput Aided Eng

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A method to tilt the beam of a planar antenna in the E‐plane is demonstrated by implementing a metamaterial (MM) structure onto the antenna substrate at the fifth‐generation (5G) band of 3.5 GHz. The beam tilting is achieved due to the phase change that occurs when the electromagnetic (EM) wave traverses through two media with different refractive indices. A new adjacent square‐shaped resonator (ASSR) structure is proposed to achieve the beam tilting in a dipole antenna. This structure provides a very low loss of −0.2 dB at 3.17 GHz. The simulation and measurement results illustrate that the radiation beam of the dipole antenna is tilted by +25° and −24° depending on the position of the ASSR array onto the dipole antenna substrate. In addition, no degradation in the gain is observed as in the conventional beam‐tilting methods; in fact, gain enhancement values of 3 dB (positive deflection) and 2.7 dB (negative deflection) are obtained compared with that of a dipole antenna with no ASSR array. The reflection coefficient of the dipole antenna with ASSR array has a good agreement with that of the dipole antenna with no ASSR array. The measured results agree well with the simulated ones.

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Reconfigurable dual-band metamaterial antenna based on liquid crystals

Cited by 23 publications

References 38 publications

Metamaterials and Their Application in the Performance Enhancement of Reconfigurable Antennas: A Review

Metamaterials and Their Application in the Performance Enhancement of Reconfigurable Antennas: A Review

Electronically Tunable Liquid-Crystal-Based F-Band Phase Shifter

Planar antenna beam deflection using low‐loss metamaterial for future 5G applications

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