Results 181 to 190 of about 3,272 (195)

An Ultrathin Filtering Transmitarray Antenna Based on Machine-Learning-Enabled Phase Synthesis

IEEE Antennas and Wireless Propagation Letters
A machine-learning (ML)-enabled phase synthesis method is proposed in this letter to optimize filtering transmitarray antennas (TAs). First, a single-layer filtering TA element is proposed, which not only offers a sufficient phase-shift range and low ...
Ruoyang Yang, Jianing Zhao, Hao Li, Tianming Li, Cheng Fu, Fang Li, Haiyang Wang, B. Hu, Yihong Zhou, Junda Chen, Mingyu Yang, Keqiang Wang, Xin Cui   +12 more
semanticscholar   +1 more source

Broadband High-Efficiency Circularly Polarized Transmitarray Using Symmetric Dual-Linearly Polarized Elements With Distinctive Excitation Mechanisms

IEEE Antennas and Wireless Propagation Letters
A high aperture-efficiency circularly-polarized (CP) transmitarray (TA) is introduced, targeting wideband satellite communication applications at the millimeter-wave frequency band.
Fan Wu, Wei Deng, Yantao Ao, Wu-Guang Zhao, Penghui Jian, Zhihao Jiang, Zengrui Li   +6 more
semanticscholar   +1 more source

A transmitarray enabling broadband high-purity OAM vortex beams in the Ka-band

International journal of microwave and wireless technologies
This paper introduces a three-substrate layered transmitarray design that avoids the use of vias, aiming to produce broadband orbital angular momentum (OAM) vortex beams within the Ka-band.
Muhammad Ishfaq, Xiuping Li, Zihang Qi, Abdul Aziz, Wenyu Zhao, Abdual Majeed, Zahid Iqbal   +6 more
semanticscholar   +1 more source

Wideband Circularly Polarized Transmitarray Antenna Based on Differential Unit Cell

IEEE Antennas and Wireless Propagation Letters
In this letter, a new differential receiving-transmitting (R-T) unit cell for a wideband circularly polarized transmitarray antenna (CPTA) is presented.
Xue Ren, Qin Zhou, K. Wang, Ouyang Hao, Ruihua Liu, Q. Xue, Hang Wong   +6 more
semanticscholar   +1 more source

W-Band Double-Layered Dual-Linearly Polarized Vialess Transmitarray Without Using Air Gap

IEEE Antennas and Wireless Propagation Letters
A W-band double-layered dual-linearly polarized transmitarray (DLPTA) is proposed for the first time by utilizing hybrid vialess unit cells (UCs) of three kinds for maximizing the phase coverage.
Yu-Chen Hsu, T. Ma
semanticscholar   +1 more source

On the Filtering Dielectric Resonator Transmitarray

IEEE Antennas and Wireless Propagation Letters
This letter reports the first filtering dielectric resonator (DR) transmitarray that directs an incident wave in a designed direction. The DR elements are three-dimensional devices made of a dielectric material.
Kai Xu, Kwok Wa Leung
semanticscholar   +1 more source

A 28 GHz Transmitarray Antenna With Enhanced Aperture Efficiency by Beam-Shaped Feed

IEEE Transactions on Antennas and Propagation
The beam-shaped technique is introduced in the transmitarray antenna (TA) to enhance the antenna gain and aperture efficiency. Considering the path loss and the TA element’s pattern, the optimum radiation pattern of the feeding source is required to ...
B. Xiang, Kwai‐Man Luk
semanticscholar   +1 more source

Low-Profile Beamwidth Switchable Antenna Hybridizing Transmitarray and Fold Transmitarray

IEEE Transactions on Antennas and Propagation
A low-profile antenna hybridizing transmitarray and fold transmitarray for beamwidth switching between the flat-top beam and high-gain beam is proposed in this article.
Shizhe Xu, Yizhu Shen, Rundong Zhang, Sanming Hu   +3 more
semanticscholar   +1 more source

A Circularly Folded Transmitarray With RCS Reduction for In-Band Copolarization and Cross-Polarization Waves

IEEE Antennas and Wireless Propagation Letters
This letter proposes a novel design approach for circularly polarized folded transmitarray (CPFTA), integrating radiation and in-band copolarization/cross-polarization radar cross-section (RCS) reduction characteristics.
X. Zong, Jiyuan Shen, Zeqing Du, Yin Li, Ming Jiang, L. Lei, Jun Hu   +6 more
semanticscholar   +1 more source

A Comparative Study on Ray-Tracing and Physical-Optics Methods for the Analysis of Transmitarray Antennas

European Conference on Antennas and Propagation
This study compares the accuracy of two semi-analytical methods based on ray tracing (RT) and physical optics (PO) for the analysis and design of transmitarrays of different sizes. The assessment considers multiple focal-to-diameter ratios and eight unit
Andrea Tummolo, Orestis Koutsos, F. F. Manzillo, Antonio Clemente, R. Sauleau   +4 more
semanticscholar   +1 more source