Dual-Mode Plasma Reflectarray/ Transmitarray Antennas

Malhat, Hend A.; Badawy, Mona M.; Zainud-Deen, S.H.; Awadalla, K. H.

doi:10.1109/tps.2015.2440237

Cited by 38 publications

(14 citation statements)

References 16 publications

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“…In contrast, the inhomogeneous anisotropic metasurfaces aim to achieve constructive interferences of EM waves along with the asymmetric propagation [31]- [38]. In these studies, the technique of reconfigurable apertures manipulates the phase of unit cells by turning diodes on and off [31]- [33] or controlling the ionized plasma gas density [34]; however, this method still needs bias networks that incur design and fabrication complexity. Some dual-mode metasurfaces are proposed based on the concept of frequency selective surfaces, but the reflectarray and transmitarray are realized at different frequencies [35], [36].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Metasurface With Asymmetric Propagation of Electromagnetic Waves and Enhancements of Antenna Gain

et al. 2021

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An anisotropic metasurface that performs a reflectarray and transmitarray on each side is proposed. The proposed configuration comprises 15 × 15 unit cells that consist of polarization converters and a polarization filter. Two topologies are developed for the unit cells to meet five design goals simultaneously, including reflection magnitude, transmission magnitude, reflection phase difference, transmission phase difference, and polarization conversion ratio. By arranging the two topologies of unit cells according to a required phase distribution, in-phase reflection and transmission are achieved on each side. A prototype is designed, fabricated, and analyzed at 28.0 GHz. The feed is implemented as a quasi-Yagi antenna with gain of 8.0 dBi. When linearly-polarized electromagnetic waves impinge on the top, the proposed metasurface functions as a reflectarray and offers gain of 17.9 dBi. When the feed antenna illuminates the bottom, the proposed metasurface performs a transmitarray and depicts gain of 19.1 dBi. Moreover, when the both sides are arranged with feeds, a unidirectional pattern with power gain of 20.3 dBi is obtained. Such a "twin-feed mode" demonstrates a highly-directed main beam with orthogonal polarization components, which is useful in dual-polarized communications. Thus, the proposed metasurface provides antenna applications with low-cost, low-complexity, and multifunctional wavefront manipulation.INDEX TERMS Anisotropic, directive antennas, electromagnetic metamaterials, focusing, Yagi-Uda antennas.

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Section: Introductionmentioning

confidence: 99%

Anisotropic Metasurface With Asymmetric Propagation of Electromagnetic Waves and Enhancements of Antenna Gain

et al. 2021

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“…Of course, relevant studies on dual-mode reflection/transmission array antenna have also been proposed recently. In 2015, a dual-mode plasma reflectarray/transmitarray antenna was designed in [20] and [21]. By controlling the ionized plasma gas density of the square ground plane, two modes of operations were obtained for the same unit cell.…”

Section: Introductionmentioning

confidence: 99%

An FSS-Backed Reflection/Transmission Reconfigurable Array Antenna

Wang

Shi

2020

IEEE Access

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Reflectarray and transmitarray antennas have been widely used in radar detection systems and satellite communications. Simultaneous realization of reflection and transmission of electromagnetic waves under the same antenna aperture will undoubtedly save more space and cost, which is beneficial to their broader applications. In this paper, an antenna element based on active frequency selective surface (FSS) is proposed, which can realize band-pass and band-stop conversion by controlling the bias of the loaded PIN diode. Then, a reconfigurable antenna array including 9 × 9 elements and fed through a horn antenna is designed and demonstrated. Simulation and measurement results show that the designed antenna can realize the conversion of reflection and transmission at the frequency of 11 GHz, and the measured peak gain of reflection and transmission reaches 18.2 dBi and 20.9 dBi, respectively.

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“…The reflectarray consists of an array of reflective cells, introducing a given desired phase‐shift upon reflection of the wave on the surface, offering the simplicity and highly efficient. Reflectarrays have a wide variety of applications in radar systems, radio astronomy observations and satellite communications [20]. Tunable electromagnetic materials can be used as part of the construction of the reflectarray elements, enabling reflectarray to become powerful beam‐forming platforms that combine the best features of aperture antennas and phased arrays [21–23].…”

Section: Introductionmentioning

confidence: 99%