Wideband Reflectarrays for 5G/6G: A Survey (original) (raw)
International Journal of Microwave and Wireless Technologies
This paper presents the design of two passive shaped-beam reflectarrays acting as passive intelligent reflecting surfaces (IRSs) to enhance 5G millimeter-wave coverage in the 27.2–28.2 GHz band. The reflectarray panels have been designed to generate a broadened and deflected beam in dual-linear polarization (horizontal and vertical). The reflectarray cell provides a robust performance under incidence angles of up to 50°, with more than 360° of phase variation range. Phase-only synthesis based on the generalized intersection approach has been applied to obtain the phase distribution on each reflectarray panel, so that their radiation patterns comply with the beamwidth and pointing requirements of the scenario under study. The two reflectarrays show a stable performance in the 27.2–28.2 GHz band in terms of gain, side-lobe level, and cross-polarization. The results confirm the potential of this technology to implement passive low-cost IRSs that will contribute to improve millimeter-wa...
Circular polarization folded reflectarray antenna for 5G applications
TELKOMNIKA (Telecommunication Computing Electronics and Control)
First and foremost, I wish to express my deepest appreciation to my project supervisor, Dr. Mohd Fairus bin Mohd Yusoff for his valuable guidance, immense knowledge and advice throughout the duration of this project. With his continuous support and encouragement, this project finally has been presented. Apart from that, I would like to take this opportunity to thank my beloved parents and siblings for giving me support and unconditional love throughout my academic years. Their understanding is very important and precious for me. Last but not least, I would like to thank to all my friends for gracing me strength and confidence during this project. They have often motivated and always supported me. I really appreciated it.
Patents on reconfigurable reflectarray antennas
2009
Reflectarray antennas have attracted significant attention due to a number of attractive properties, such as low cost, and conformal deployment capability. In addition, the drive towards flexible radio transceivers, enabling beamforming and multi-beam operation has spurred significant interest towards the design of antenna elements and antenna arrays with reconfigurable capabilities. A review of recent publications and patents on reconfigurable reflectarrays is presented focusing on the different capabilities, technologies and architectures that have been proposed.
Design and Performance Improvement of Broad-Beam Microstrip Reflectarray
This paper presents the design and the effectiveness of reducing the unit cell size of microstrip reflectarray which is duplicated the same radiating aperture as quadratic backscatter. A reflectarrays with variable element sizes and reduced grid spacing have been designed at 10 GHz. For a given number of elements, it is shown that increased gain can be attainted for reduced unit cell size with no significant change in array size.
Performance Improvement in the Design of Broad-Beam Microstrip Reflectarray
This is a theoretical and experimental study of microstrip reflectarray useable in wireless local area networks (WLAN). The effectiveness of reducing the unit cell size of microstrip reflectarray which is duplicated the same radiating aperture as quadratic backscatter was investigated. A reflectarray with variable element sizes and reduced grid spacing have been designed at 10 GHz. For a given number of elements, it is shown that increased gain can be attainted for reduced unit cell size with no significant change in array size. To confirm the validity of this approach, an X-band antenna prototype was designed and developed. It was experimentally tested and showed good performance characteristics.
Reciprocity Considerations in Microstrip Reflectarrays
IEEE Antennas and Wireless Propagation Letters, 2009
The reciprocity principle and the reaction concept are employed to develop procedures for the design and analysis of microstrip reflectarrays in the receive mode. The new design procedure is shown to be fast and efficient, especially for dual-polarization applications. Examples are shown to illustrate the accuracy and efficiency of the receive mode design technique.
Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2019
This paper presents two designs of reflectarrays with two different unit cells: a novel broadband microstrip unit cell and a 3D all-metal unit cell. The microstrip unit cell consists of two concentric octagonal rings plus an octagonal patch with an empty cross inside. On the other hand, the all-metal unit cell is composed of a pure copper cuboid. These reflectarrays are designed to work around 28 GHz for suitable 5G operation. A pyramidal horn antenna is used for the feeding purpose. The F/D ratio is equal to one. The reflectarray is 107 mm × 107 mm in dimensions. The simulation results show that the reflectarray based on the microstrip unit cell achieves a 1-dB gain-bandwidth of about 31.2% with a gain equal to 27.2 dB at 28 GHz. On the other hand, the all-metal reflectarray achieves a 1-dB gain-bandwidth of 14.5% and a gain equal to 28.5 dB at 28 GHz. From the obtained results, it is clear that the microstrip reflectarray is superior from the gain-bandwidth perspective, while the allmetal reflectarray is superior from the gain perspective. The microstrip reflectarray has been fabricated, and its performance has been measured. A good agreement between the simulation and measurement results has been achieved.
Passive Dual-Polarized Shaped-Beam Reflectarrays to Improve Coverage in Millimeter-Wave 5G Networks
2021 15th European Conference on Antennas and Propagation (EuCAP)
This contribution presents the design of a passive shaped-beam reflectarray to improve coverage in 5G cellular networks. The reflectarray has been designed to produce a broadened and deflected beam in dual-linear polarization at 27.7 GHz. The unit cell provides more than 360º range of phase variation and a robust performance under large angles of incidence (around 50º). Phase-only synthesis has been applied to obtain the required phase distribution on the reflectarray to fulfill the scenario requirements in terms of beam pointing and HPBW. The designed reflectarray exhibits a stable behavior within the 27.2-28.2 GHz band, showing the potential of this technology for millimeter-wave 5G communications.