Liquid-crystal-based reflectarray antenna with electronically switchable monopulse patterns

Hu, Wencheng; Ismail, M. Y.; Cahill, R.; Encinar, José A.; Fusco, Vincent; Gamble, Harold; Linton, D.; Dickie, R.; Grant, N.; Rea, Simon

doi:10.1049/el:20071098

Cited by 73 publications

(39 citation statements)

References 4 publications

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“…In [1]- [3], the behavior of a single resonant LC-reflectarray cell was experimentally demonstrated in X, Ka and W bands, respectively. The previous work highlighted several limitations for this type of cell, such as: insufficient phase range, narrow bandwidth, high losses and often poor agreement between simulated and measured results.…”

Section: Recent Developmentsmentioning

confidence: 99%

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Liquid crystal based beam scanning reflectarrays and their potential in SATCOM antennas

Pérez-Palomino

Barba

Encinar

et al. 2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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Section: Recent Developmentsmentioning

confidence: 99%

“…The required phase agility is obtained by exploiting the property of the liquid crystals to change its permittivity by the application of an AC voltage [1]- [4]. This property is exhibited over a wide range of frequencies, spanning AC to optical wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal based beam scanning reflectarrays and their potential in SATCOM antennas

Pérez-Palomino

Barba

Encinar

et al. 2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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“…In the literature, several unit cell geometries based on this tunable material have been designed and experimentally evaluated [2]- [8], which have led to the development of several different LC-based antenna arrangements [4]- [8]. In [4], 1-bit phase quantization was used to produce a switchable radiation pattern shape from sum to difference, whereas a continuous phase variation was used to implement a LC reflectarray with scanning capabilities in one plane at 35 GHz [5] and 77 GHz [6]- [7].…”

mentioning

confidence: 99%

“…In [4], 1-bit phase quantization was used to produce a switchable radiation pattern shape from sum to difference, whereas a continuous phase variation was used to implement a LC reflectarray with scanning capabilities in one plane at 35 GHz [5] and 77 GHz [6]- [7]. A LC-reconfigurable reflectarray at 78 GHz has been proposed in a folded configuration [8] to provide beam scanning in one plane with higher gain (25dBi).…”

mentioning

confidence: 99%

“…Furthermore, the bias voltage applied at each LC cell is obtained in [5]- [7] by using an algorithm based on measuring the received power and varying sequentially the voltages until maximum received power is obtained. In [4] and [8], the voltages are obtained by measuring the voltage dependence of the cells at one angle of incidence and for fixed cell dimensions. These procedures were employed because of the impossibility of measuring the phase curve versus voltage at each frequency, angle of incidence and for different cell dimensions, which is required to configure the appropriate phase-shift at each cell across the reflectarray surface.…”

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Design and Demonstration of an Electronically Scanned Reflectarray Antenna at 100 GHz Using Multiresonant Cells Based on Liquid Crystals

Pérez-Palomino

Barba

Encinar

et al. 2015

IEEE Trans. Antennas Propagat.

150

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Abstract-The design, fabrication and measured results are presented for a reconfigurable reflectarray antenna based on liquid crystals (LC) which operates above 100 GHz. The antenna has been designed to provide beam scanning capabilities over a wide angular range, a large bandwidth and reduced Side-Lobe Level. Measured radiation patterns are in good agreement with simulations, and show that the antenna generates an electronically steerable beam in one plane over an angular range of 55° in the frequency band from 96 to 104 GHz. The Side Lobes Level is lower than -13 dB for all the scan angles and -18 dB is obtained over 16% of the scan range. The measured performance is significantly better than previously published results for this class of electronically tunable antenna, and moreover verifies the accuracy ofthe proposed procedure for LC modeling and antenna design.Index Terms-Beam scanning reflectarrays, liquid crystal (LC), millimeter and sub-millimeter wave antennas, radar applications

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Antennas

Christodoulou

Wahid

Chryssomallis

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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Antennas, as essential parts of a radio system, are defined as the devices that can radiate and receive electromagnetic energy in an efficient and desired manner. There are many different types of antennas, most of them designed specifically to fit a definite application. Although some of them, which were introduced many decades before, are still in use, there are also new antenna systems that follow modern demands for greater performance of various radio systems. The area of antennas is characterized as vigorous and dynamic. A suitable approach is the classification of antennas generally into the following categories: wire antennas, reflector antennas, lens antennas, traveling wave antennas, frequency‐independent antennas, horn antennas, and conformal antennas. Antenna arrays, formed by suitably spacing radiating elements, are used to improve the characteristics of an individual antenna element. Reconfigurable antennas can radiate at different frequencies and polarizations and more than one pattern, providing more functionality in modern systems. Antennas enjoy a very large range of applications, both in the military and in the commercial world. The most well‐known applications of antennas are associated with radio, TV, and communication systems. Today, antennas find extensive use in biomedicine, radar, remote sensing, astronomy, navigation, radio frequency identification, controlling space vehicles, collision avoidance, air traffic control, GPS, pagers, wireless telephone, wireless local area networks, and so on.

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Liquid-crystal-based reflectarray antenna with electronically switchable monopulse patterns

Cited by 73 publications

References 4 publications

Liquid crystal based beam scanning reflectarrays and their potential in SATCOM antennas

Liquid crystal based beam scanning reflectarrays and their potential in SATCOM antennas

Design and Demonstration of an Electronically Scanned Reflectarray Antenna at 100 GHz Using Multiresonant Cells Based on Liquid Crystals

Antennas

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