Zobrazeno 1 - 10
of 439
pro vyhledávání: '"Junping Geng"'
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol 15, Iss 6, Pp 629-643 (2021)
Abstract An approach to achieve directional low‐profile UWB antenna by omnidirectional source with a reflector, is proposed. The general theoretical model about the direction and the phase conditions between the upward and reflected field are devel
Externí odkaz:
https://doaj.org/article/73c5e30de18c4dfebf9575454ef031e5
Publikováno v:
IEEE Access, Vol 8, Pp 7466-7472 (2020)
Circularly-polarized planar antenna with a shaped pattern for airborne applications, is proposed in this letter. The proposed antenna consists of vertically-polarized formation and horizontally-polarized stubs to provide circularly-polarized configur
Externí odkaz:
https://doaj.org/article/b7f89ef808654d4e87f6ed439161bc39
Autor:
Kaijie Zhuang, Junping Geng, Kun Wang, Han Zhou, Yuliang Liang, Xianling Liang, Weiren Zhu, Ronghong Jin, Wenfeng Ma
Publikováno v:
IEEE Access, Vol 7, Pp 15444-15451 (2019)
A pattern reconfigurable antenna based on switchable spoof surface plasmon polaritons (SSPPs) transmission line is experimentally presented. There are two fundamental modes on traditional SSPPs transmission line, the odd mode and the even mode. In th
Externí odkaz:
https://doaj.org/article/bf234c0c9cd8465b8c6b1d36c209fe49
Publikováno v:
IEEE Access, Vol 7, Pp 62689-62694 (2019)
In this paper, we propose a new method to effectively measure orbital angular momentum (OAM) properties for long-distance transmission. Properties of OAM wavefront in terms of phase and amplitude are measured by rotating the OAM wave antenna and fixi
Externí odkaz:
https://doaj.org/article/dd0f3d626cce463faa6ba738eaad666f
Autor:
Junping Geng, Richard W. Ziolkowski, Kun Wang, Xiaonlan Zhao, Han Zhou, Guanshen Chenhu, Xianling Liang, Ronghong Jin
Publikováno v:
IEEE Access, Vol 7, Pp 96284-96296 (2019)
A compact T-shaped feed structure (TFS) is reported that enables the realization of two types of diversity antennas: a polarization diversity antenna (PDA) and a spatial diversity antenna (SDA). Both systems have a high potential for mobile wireless
Externí odkaz:
https://doaj.org/article/ebf0789e25fa48eab4ae86ddefd30c94
Publikováno v:
International Journal of Antennas and Propagation, Vol 2021 (2021)
This paper proposes a new method of realizing multimode OAM beams with almost the same divergence angles. The theoretical relationship between the divergence angle of the OAM beam and its radiation source is presented, and the radiation source distri
Externí odkaz:
https://doaj.org/article/ce18cd5ffe7c4f1e9a95773ce738c8f7
Autor:
Qaisar Hayat, Junping Geng, Xianling Liang, Ronghong Jin, Sami Ur Rehman, Chong He, Haobo Wu, Hamza Nawaz
Publikováno v:
Nanomaterials, Vol 11, Iss 1, p 99 (2021)
The enhancement of optical characteristics at optical frequencies deviates with the choice of the arrangement of core-shell nanoparticles and their environment. Likewise, the arrangements of core-shell nanoparticles in the air over a substrate or in
Externí odkaz:
https://doaj.org/article/16cdf146c85e414bbaf0142d4b46175d
Publikováno v:
Nanomaterials, Vol 10, Iss 10, p 1996 (2020)
We proposed an IR absorber hybrid nanoantenna comprise of two overlapping gold nanoparticles residing over larger a silica nanoparticle. A wet chemical route was employed to prepare the hybrid structure of nanoantenna. High-resolution transmission el
Externí odkaz:
https://doaj.org/article/e9f5173484b248ea8fbd4140162457b6
Autor:
Weiren Zhu, Fajun Xiao, Ming Kang, Debabrata Sikdar, Xianling Liang, Junping Geng, Malin Premaratne, Ronghong Jin
Publikováno v:
IEEE Photonics Journal, Vol 8, Iss 6, Pp 1-7 (2016)
We present a comprehensive analysis of terahertz waves propagation through a bulk MoS2 crystal slab. It is shown that broadband coherent perfect absorption can be achieved and the coherent absorptivity can be adjusted from 1.57% to 99.97% by means of
Externí odkaz:
https://doaj.org/article/1ad454e74a6b4b70ac79aa63bba5ff0a
Publikováno v:
International Journal of Antennas and Propagation, Vol 2017 (2017)
A topological method for the design and optimization of planar circularly polarized (CP) directional antenna with low profile was presented. By inserting two parasitic layers, generated by particle swarm optimization, between the equiangular spiral a
Externí odkaz:
https://doaj.org/article/ea8c1b58f5934cb68caa9736abb5f2d4