Results 1 to 10 of about 5,290,066 (245)

Frequency Diversity Array Radar and Jammer Intelligent Frequency Domain Power Countermeasures Based on Multi-Agent Reinforcement Learning

Remote Sensing
With the development of electronic warfare technology, the intelligent jammer dramatically reduces the performance of traditional radar anti-jamming methods.
Changlin Zhou, Chunyang Wang, Lei Bao, Xianzhong Gao, Jian Gong, Ming Tan   +5 more
doaj   +3 more sources

A high-gain Y-shaped patch array with an 8-port MIMO configuration for pattern diversity in mm-wave applications [PDF]

Scientific Reports
The increasing demand for high-speed communication has driven the development of antennas with improved performance characteristics for millimeter-wave (mm-Wave) 5G applications.
Anees Abaas, Wahaj Abbas Awan, Domin Choi, Niamat Hussain, Dongkyu Sim, Nam Kim   +5 more
doaj   +2 more sources

Joint frequency space design approach for efficient planar frequency diverse arrays

Scientific Reports, 2023
Antenna arrays offer advantages in terms of spatial diversity, allowing for control over pattern specifications in space. The incorporation of frequency diversity in arrays presents an opportunity to manipulate beams in the Space–Time domain.
Maryam Hasheminasab, A. Cheldavi, Ahmed A. Kishk   +2 more
doaj   +1 more source

Transparent Liquid Multiple-Antenna Array with a High Gain and Beam Diversity for UHD TV Applications [PDF]

Journal of Electromagnetic Engineering and Science, 2022
The design of television (TV) antennas for commercial use that operate on the ultra-high frequency (UHF) band has become more challenging given the relatively large size of these antennas and considering that they typically do not conform to ...
Duy Tung Phan, Chang Won Jung
doaj   +1 more source

Wideband MIMO Antenna for 5G Base Station

Tạp chí Khoa học và Công nghệ, 2023
In this paper, we present a configuration of a wideband MIMO antenna array for 5G terminals. The single-element antenna has compact size, dual polarization, wide operating bandwidth covering the 5G N78 frequency band, and high isolation between the two ...
Hien Doan Thi Ngoc
doaj   +1 more source

Nonlinear Frequency Offset Beam Design for FDA-MIMO Radar

Sensors, 2023
The beam pattern of frequency diversity array (FDA) radar has a range–angle two-dimensional degree of freedom, which makes it possible to distinguish different targets from the same angle and brings a new approach to anti-jamming of radars.
Yanjie Xu, Chunyang Wang, Guimei Zheng, Ming Tan   +3 more
doaj   +1 more source

A Time Modulated Array With Polarization Diversity Capability

IEEE Access, 2021
The Time Modulated Array (TMA) provides multiple radiation beams at different frequencies, by turning the radiating elements on and off. In this paper, we propose to add polarization diversity to a wireless communication link by leveraging the ...
Mohammad Hossein Mazaheri, Mohammad Fakharzadeh, Mahmood Akbari, Safieddin Safavi-Naeini   +3 more
doaj   +1 more source

Joint optimisation of transmit beamspace and receive filter in frequency diversity array‐multi‐input multi‐output radar

IET Radar, Sonar & Navigation, 2022
Frequency diversity array (FDA) radar provides more degrees of freedom and can generate range‐angle‐time‐dependent beampattern. Furthermore, based on the receiver's multi‐input multi‐output (MIMO) scheme, the frequency diversity array‐multi‐input multi ...
Changlin Zhou, Chunyang Wang, Jian Gong, Ming Tan, Lei Bao, Mingjie Liu   +5 more
doaj   +1 more source

Two-Dimensional Fiber Beamforming System Based on Mode Diversity

IEEE Access, 2021
In this paper, a novel two-dimensional (2D) beamforming system based on mode diversity and true-time delay (TTD) of optical fiber is proposed. The system is composed of two cascaded TTD units, which are single-mode fiber TTD line array and mode TTD line ...
Meiling Zhang, Xiao Liu, Rui Pang, Guijun Hu   +3 more
doaj   +1 more source

Time Frequency Direction Modulation Based on Nonlinear Frequency Diverse Array

IEEE Access, 2023
The conventional frequency diversity array (FDA) can generate arcsine form of continuous direction modulation (DM) waveforms which can automatically scan the entire space range.
Haihua Xie, Han Ren, Yangyang Zhang, Rujiang Guo, Huijie Liu   +4 more
doaj   +1 more source