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- 摘要
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- 实验方案
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Design and implementation of a low profile polarization-reconfigurable transmitarray with linear polarized feed
摘要： A novel polarization-reconfigurable transmitarray with linear polarized feed is presented in this letter. Each element in the proposed transmitarray consists of two cascaded cross dipoles to achieve more than 310° of linear phase with transmission magnitude equal to or better than 0.8 dB. The proposed unit cell has a thickness of 0.22λ0, which leads to a low profile transmitarray compared with those conventional designs. The element behavior of low transmission loss has resulted in higher antenna efficiency. By properly rotating the feed antenna around the center and selecting the x- and y-dimension of each element, the proposed transmitarray can generate radiation patterns with different polarization states, including left-handed circular polarization (LHCP), right-handed circular polarization (RHCP), and linear polarization(LP). For the purpose of validation, a double-layer center-fed 11 × 11-element transmitarray prototype is manufactured and tested at X-band. Measurement results demonstrate the designed transmitarray realize both high gain performance and multiple polarization operation.
关键词： cross dipole,polarization reconfigurable,low profile,transmitarray
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Advanced Technologies for Communications (ATC) - Ho Chi Minh City, Vietnam (2018.10.18-2018.10.20)] 2018 International Conference on Advanced Technologies for Communications (ATC) - Wideband Unit-cell for Linearly Polarized X-band Transmitarray Applications
摘要： In this paper, we present a large phase range unit-cell for X-band passive transmitarray antennas. The unit-cell is designed by using the combination of cut-circular patches and cut-ring slots. A 3-bit phase resolution has been optimized to provide eight values of the transmission phase with a step of 45°. The bandwidth of -1 dB transmission magnitude reaches 21.3%. A 10x10-element transmitarray based on the unit-cell configuration has been simulated. The transmitarray antenna provides good radiation patterns and a high aperture efficiency of 52.1%.
关键词： flat lens antenna,Transmitarray,transmitarray antenna,transmitarray unit-cell
更新于2025-09-23 15:22:29
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Phased Transmitarray Antennas for 1-D Beam Scanning
摘要： A transmitarray antenna (TAA) fed by a phased array antenna (PAA) for one-dimensional (1-D) beam scanning is proposed at 10 GHz in this letter. The TAA is composed of two types of elements, i.e., the hexagonal subwavelength low-pass elements as well as the pure dielectric ones. The PAA feed is a 1-D printed dipole array loaded with the short-circuited dummy ones. The proposed PAA-fed TAA, with a feeding distance to TAA diameter ratio (H/D) of mere 0.375, achieves a peak simulated gain of 25.6 dBi at 0o scanning (corresponding to peak aperture efficiency of 57.5%) and a 3.13 dB gain drop for ±30o beam scanning, along with a ~2-dB beam crossover. The measured results agree reasonably well with the simulated ones, validating the proposed design.
关键词： periodic structures,phased array antennas,transmitarray antennas,Beam scanning
更新于2025-09-23 15:22:29
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Unit-Cell loaded with PIN diodes for 1-bit Linearly Polarized Reconfigurable Transmitarrays
摘要： In this letter, a reconfigurable unit-cell for transmitarray antenna working at X-band is presented. It is designed to provide 1-bit phase quantization using p-i-n diodes. The unit-cell is based on multi-layer frequency selective surfaces with the use of two substrates and a combination of a C-patch and a ring slot loaded by a rectangular gap. It is optimized using full-wave electromagnetic simulation and verified by using waveguide simulator. The experimental results show that the unit-cell provides two values of transmission phase with a step of 180° at 11.5 GHz. Furthermore, the unit-cell has a low thickness of 0.19λ0, and is low-cost and easy to fabricate.
关键词： flat lens antenna,Transmitarray antenna,reconfigurable transmitarray antenna
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Single Layer Multi-Polarization Transmitarray in C-Band with Beam-Steering Capability
摘要： A single layer multi-polarization transmitarray is presented in this paper, whose structure can be much simpler than the traditional multi-layer frequency selective surface transmitarray. The proposed transmitarray consists of numerous split ring elements and has three working conditions. It is designed, simulated and measured in C-band. The measurement result shows that the transmitarray can switch polarization of the incident wave and set separation beam direction at the same time
关键词： beam separation,phase modulation,transmitarray,polarization conversion
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE Seventh International Conference on Communications and Electronics (ICCE) - Hue City, Vietnam (2018.7.18-2018.7.20)] 2018 IEEE Seventh International Conference on Communications and Electronics (ICCE) - Multibeam Transmitarrays for 5G Antenna Systems
摘要： In this paper, preliminary results on the feasibility of a multibeam antenna based on the use of a transmitarray are presented. A reduced size configuration has been properly designed and optimized, with the aim to minimize the degradation of the radiation pattern introduced by the variation in the direction of maximum radiation. Thereafter, the numerical analysis of the obtained antenna has been performed.
关键词： Multibeam antenna,MIMO antenna,Transmitarray
更新于2025-09-10 09:29:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Enhancing the Bandwidth in Transmitarray Antennas Using Tapered Transmission Line Matching Approach
摘要： This paper proposes an innovative method to improve the bandwidth of transmitarray antennas using a tapered transmission line approach. A novel three-layer perforated dielectric unit-cell is introduced: it is made up by a central layer, with a varying size square hole, and two linearly tapered matching layers. To validate the proposed solution, a wideband transmitarray composed by 60x60 elements and working in Ka-band has been designed and simulated. The simulated structure has a size of 15λ × 15λ and it provides a 1-dB gain bandwidth of 27.4%, an aperture ef?ciency of 45.3% and a gain of 31.1 dB at 30 GHz.
关键词： Wideband antenna,planar lens,transmitarray
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Reconfigurable Reflectarrays and Transmitarrays: From Antenna Designs to System Applications
摘要： This paper reviews the recent research progress on reconfigurable reflectarrays (RRA) and reconfigurable transmitarrays (RTA) at Tsinghua University. Numerous antenna designs are presented, including W-band RRA, 2-bit RRA, 10240-element RRA, 2-layer RTA, and current-reversal RTA. Furthermore, the RRA and RTA demonstrate a promising potential in advanced wireless systems. As an example, a RRA-based security imaging system is illustrated in details.
关键词： reconfigurable,antenna,reflectarray,transmitarray
更新于2025-09-04 15:30:14