Zobrazeno 1 - 10
of 97
pro vyhledávání: '"Junxiang Ge"'
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol 17, Iss 6, Pp 427-433 (2023)
Abstract A W‐band dual‐beam low side‐lobe level antenna with a shared slotted waveguide radiating layer was designed by the authors. The proposed antenna consists of a symmetrical dual ports feed network layer located on two sides of the antenn
Externí odkaz:
https://doaj.org/article/8feb38a544cb40a1981013bcea9592f4
Publikováno v:
Remote Sensing, Vol 15, Iss 21, p 5234 (2023)
Velocity aliasing is unavoidable for millimeter-wave cloud radar (MMCR) due to its short wavelength. In the vertically pointing MMCR, a special aliasing state called half-folding will cause the traditional postprocessing dealiasing methods used for w
Externí odkaz:
https://doaj.org/article/329e11412ac645b1a852a8dab78fb6c9
Publikováno v:
Sensors, Vol 23, Iss 21, p 8891 (2023)
A new method using three dimensions of cloud continuity, including range dimension, Doppler dimension, and time dimension, is proposed to discriminate cloud from noise and detect more weak cloud signals in vertically pointing millimeter-wave cloud ra
Externí odkaz:
https://doaj.org/article/e032d270d5244d4f83fa206c11b85e39
Publikováno v:
IEEE Access, Vol 10, Pp 22480-22486 (2022)
In this paper, a 94 GHz dual-polarization high-isolation cassegrain antenna feed by a diagonal horn antenna is designed. The antenna consists of a D = 540 mm main reflector, sub-reflector, and dual-port dual-polarization diagonal horn feed antenna. T
Externí odkaz:
https://doaj.org/article/af73247e5976467fb7835a0e4c0b430c
Publikováno v:
Remote Sensing, Vol 15, Iss 12, p 3098 (2023)
A 94 GHz pulse Doppler solid-state millimeter-wave cloud radar (MMCR), Tianjian-II (TJ-II), has been developed. It reduces the size and cost using a solid-state power amplifier (SSPA) and a single antenna. This paper describes the system design, incl
Externí odkaz:
https://doaj.org/article/85c8538c3c7c4c568cf5517a34546396
Autor:
Blaise Ravelo, Samuel Ngoho, Glauco Fontgalland, Lala Rajaoarisoa, Wenceslas Rahajandraibe, Remy Vauche, Zhifei Xu, Fayu Wan, Junxiang Ge, Sebastien Lallechere
Publikováno v:
IEEE Access, Vol 8, Pp 192951-192964 (2020)
This paper aims to develop an original circuit theory of inductorless NGD topology. The considered passive cell comprised of resistor and capacitor elements without inductor operates as a bandpass (BP) NGD function. The specifications of NGD function
Externí odkaz:
https://doaj.org/article/d73a42670d56446eb7b9a0a9c905ff4e
Publikováno v:
Journal of Marine Science and Engineering, Vol 11, Iss 2, p 440 (2023)
The characterization of targets by electromagnetic (EM) scattering and underwater acoustic scattering is an important object of research in these two related fields. However, there are some difficulties in the simulation and measurement of the scatte
Externí odkaz:
https://doaj.org/article/f256d730d4334a98a69ddf49ca414cac
Publikováno v:
IEEE Access, Vol 7, Pp 75708-75720 (2019)
An innovative negative group delay (NGD) theory based on a unity direct chain feedback (UDCF) circuit topology is developed in this paper. This NGD circuit is an active cell constituted by an operational amplifier in feedback with a four-port RC-netw
Externí odkaz:
https://doaj.org/article/38e3b415f0d14f51892922601933a3a0
Publikováno v:
Sensors, Vol 22, Iss 10, p 3675 (2022)
It is important to monitor the take-off and landing of civil aircraft using passive detection methods. Due to the strict aircraft safety requirements and the electromagnetic environment around an airport, using too many active detection methods shoul
Externí odkaz:
https://doaj.org/article/95441e0a65fc48afa6b4a66b512dc6b7
Publikováno v:
IEEE Access, Vol 6, Pp 33849-33858 (2018)
This paper addresses a circuit theory regarding the negative group delay (NGD) principle. The methodology for characterizing this unfamiliar NGD function is described. The basic NGD topology under study is typically an active cell composed of an RF l
Externí odkaz:
https://doaj.org/article/025bd6dbadff4abaa0626fbafe282367