High Efficiency Bandwidth Electrically Small Antennas for Compact Wireless Communication Systems

2019 ◽  
Author(s):  
Jean Paul Santos ◽  
Foad Fereidoony ◽  
Maziar Hedayati ◽  
Yuanxun Ethan Wang
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
High Efficiency ◽  
Wireless Communication Systems ◽  
Electrically Small Antennas ◽  
Small Antennas

scholarly journals Programmable time-domain digital-coding metasurface for non-linear harmonic manipulation and new wireless communication systems

2018 ◽  
Vol 6 (2) ◽  
pp. 231-238 ◽  
Author(s):  
Jie Zhao ◽  
Xi Yang ◽  
Jun Yan Dai ◽  
Qiang Cheng ◽  
Xiang Li ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Time Domain ◽  
Communication Systems ◽  
High Efficiency ◽  
Signal Transmission ◽  
Time Signal ◽  
Wireless Communication Systems ◽  
Diverse Range ◽  
Non Linear ◽  
The Time Domain

Abstract Optical non-linear phenomena are typically observed in natural materials interacting with light at high intensities, and they benefit a diverse range of applications from communication to sensing. However, controlling harmonic conversion with high efficiency and flexibility remains a major issue in modern optical and radio-frequency systems. Here, we introduce a dynamic time-domain digital-coding metasurface that enables efficient manipulation of spectral harmonic distribution. By dynamically modulating the local phase of the surface reflectivity, we achieve accurate control of different harmonics in a highly programmable and dynamic fashion, enabling unusual responses, such as velocity illusion. As a relevant application, we propose and realize a novel architecture for wireless communication systems based on the time-domain digital-coding metasurface, which largely simplifies the architecture of modern communication systems, at the same time yielding excellent performance for real-time signal transmission. The presented work, from new concept to new system, opens new pathways in the application of metamaterials to practical technology.

scholarly journals High efficiency Doherty power amplifiers for modern wireless communication systems: A brief review

2021 ◽  
Vol 23 (3) ◽  
pp. 1855
Author(s):  
Mussa Mabrok ◽  
Zahriladha Zakaria ◽  
Tole Sutikno
Keyword(s):  
Wireless Communication ◽  
Power Amplifiers ◽  
Communication Systems ◽  
High Performance ◽  
High Efficiency ◽  
Average Power ◽  
Wireless Communication Systems ◽  
Saturation Power ◽  
Low Efficiency ◽  
Suitable Technique

Due<span lang="EN-MY">to the high peak to average power ratio (PAPR) of modern modulated signals, power amplifiers (PAs) have been forced to operate at the back-off (BO) region of their saturation power in order to avoid signal clipping and distortion. However, classical PAs suffer from low efficiency in the BO region operation. Therefore, efficiency has to be enhanced in that region. Many techniques have been proposed. Among them, the Doherty power amplifier (DPA) is considered as the most suitable technique due to its simple structure and high performance. However, its conventional design is limited to a 6 dB BO level, which does not satisfy the requirements of modern communication systems. In this paper, a brief review of the most significant techniques of high-efficiency DPA is presented. First, DPA topology and its operation principles are briefly discussed. Second, efficiency enhancement techniques such as an asymmetrical DPA, output combiner modification, gate bias adaption, offset line optimization, and multi-way DPA were discussed. The study shows that the most suitable, simple, and effective solution is an asymmetrical approach. However, it needs to be investigated in terms of bandwidth in order to meet the efficiency-bandwidth requirements of modern wireless communication systems such as </span>5G.

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