Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Zhenxin Cao"'
Autor:
Wenhou Zhang, Zongxin Wang, Zhenxin Cao, Xiaoyu Wang, Mengjiang Sun, Dongning Cui, Ying Chen, Song Ma
Publikováno v:
Heliyon, Vol 10, Iss 5, Pp e26933- (2024)
—Extremely-Low Frequencies (ELF, 30∼300Hz) transmitting antennas in wireless communications are often limited by antenna size and complex impedance matching networks. In this paper, we propose an ultra-small Artificial Electret Type Mechanical An
Externí odkaz:
https://doaj.org/article/1f004cc29baa47b5a5c222622f385e28
Publikováno v:
EURASIP Journal on Advances in Signal Processing, Vol 2022, Iss 1, Pp 1-23 (2022)
Abstract It is known that interference classification plays an important role in protecting the authorized communication system and avoiding its performance degradation in the hostile environment. In this paper, the interference classification proble
Externí odkaz:
https://doaj.org/article/d9d3b49fe1044f9fbd17332ec2c3e1b1
Publikováno v:
iScience, Vol 26, Iss 5, Pp 106741- (2023)
Summary: Mechanical antennas (MAs) directly use the mechanical motion of electric or magnetic charges to excite electromagnetic waves. The radiation distance of rotating magnetic dipole type mechanical antennas is related to the volume of the radiati
Externí odkaz:
https://doaj.org/article/66972d5e72384db6ac32309375f7ab68
Publikováno v:
IEEE Access, Vol 10, Pp 105556-105563 (2022)
Ultrawideband phased antenna array has been widely used in communications, radars and detection. However, the high profile and poor wide-angle scanning characteristics have always been the critical limitation for many available ultrawideband antenna
Externí odkaz:
https://doaj.org/article/dd0e8319186e4538be52e2b46cb478c7
Publikováno v:
IEEE Access, Vol 8, Pp 113532-113542 (2020)
Two-dimensional antennas provide additional variables that can be used to control and shape the pattern, and widely used in engineering applications include tracking radar, communications, direction finding and many others. However, the reduced mutua
Externí odkaz:
https://doaj.org/article/5b1362e147864fe7b3914deb89e8c897
Publikováno v:
IEEE Access, Vol 8, Pp 141511-141522 (2020)
Usually, the array manifolds are assumed to be known perfectly in the radar systems, but the imprecise knowledge substantially degrades the performance of estimating the direction of arrival (DOA). In this paper, the DOA estimation problem in the mul
Externí odkaz:
https://doaj.org/article/57ae1f463bb84347b40c5bf12eca30c2
Publikováno v:
IEEE Access, Vol 7, Pp 87943-87950 (2019)
A novel bandwidth-enhanced dual-polarized antenna (BEDPA) with symmetrical closed-resonant-slot pairs for 2/3/4G and international mobile telecommunications bands is proposed. The BEDPA is realized by etching closed slots symmetrically on the convent
Externí odkaz:
https://doaj.org/article/516288e35fd045c1babd781b8169f928
Publikováno v:
International Journal of Antennas and Propagation, Vol 2021 (2021)
In the super-low-frequency (30∼300 Hz) band communication, the traditional antenna covers a large area and has low radiation efficiency. The excitation of electromagnetic waves by the mechanical motion of permanent magnets enables miniaturized tech
Externí odkaz:
https://doaj.org/article/dcd961cd4de44ede8f01611c015d4e0e
Publikováno v:
The Journal of Engineering (2019)
In this study, an estimation problem for target directions in the multiple-input and multiple-output (MIMO) radar system with unknown mutual coupling is considered. To exploit the target sparsity in the spatial domain, a compressed sensing-based meth
Externí odkaz:
https://doaj.org/article/b546ed5561b64fb0b4baeae4700c9cd8
Publikováno v:
AIP Advances, Vol 8, Iss 2, Pp 025325-025325-7 (2018)
Antennas in the ultra low frequency (ULF, 300 Hz to 3 kHz) and very low frequency (VLF, 3∼30 kHz) bands are usually very large. In this study, we developed a very small antenna, which can radiate electromagnetic waves in these frequency bands. The
Externí odkaz:
https://doaj.org/article/cfafa0a3cb314f0cb0118feaddf09ea8