Multifunctional Microstrip Array Combining a Linear Polarizer and Focusing Metasurface

Although microstrip reflectarrays/transmitarrays have been extensively studied in the past decades, most previous designs were confined to monofunctional operations based on either transmission or reflection. In this communication, we propose a scheme to design multifunctional arrays that can simult...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2016-08, Vol.64 (8), p.3676-3682
Main Authors: Xu, He-Xiu, Tang, Shiwei, Wang, Guang-Ming, Cai, Tong, Huang, Wanxia, He, Qing, Sun, Shulin, Zhou, Lei
Format: Article
Language:English
Subjects:
Antennas
Arrays
Broadband
Constants
Design engineering
Devices
Feeding
Focusing
linear polarizer
metasurface
Microstrip antenna arrays
microstrip arrays
multifunctional
Phased arrays
Polarizers
Reflection
Reflector antennas
Vivaldi antennas
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Summary:Although microstrip reflectarrays/transmitarrays have been extensively studied in the past decades, most previous designs were confined to monofunctional operations based on either transmission or reflection. In this communication, we propose a scheme to design multifunctional arrays that can simultaneously exhibit the functionalities of a reflectarray and a transmitarray on the basis of the appealing feature of a polarizer we discovered (i.e., constant phase difference between its cross-polarization transmission and copolarization reflection within a broadband). To demonstrate the proposed scheme, we designed and fabricated a multifunctional device comprising a 15 × 15 array of twisted complementary dual-split ring resonators, each carefully designed to exhibit the desired transmission phase satisfying a parabolic distribution. Feeding the device by a Vivaldi antenna at its focus, we numerically and experimentally demonstrated that our system functioned as a directive emitter working in a transmission/reflection mode for cross-polarization/copolarization radiation at low/high frequencies, and it can radiate directively in both directions with different polarizations at intermediate frequencies. The half-power beamwidth of the array antenna was ~15°, which is 40° narrower than that of a bare Vivaldi antenna. Moreover, the gain was higher than 13 dB in all cases studied, which is at least 7 dB higher than that of the Vivaldi antenna.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2016.2565742