Results 161 to 170 of about 9,979 (227)

A frequency and beamwidth reconfigurable antenna based on liquid crystal for 5G millimeter waves. [PDF]

Sci Rep
Chen P, Wang X, Wang D, Gan Z, Yin Y, Zhang H.   +5 more
europepmc   +1 more source

Full-polarization-locked vortex beam generator with time-varying characteristics. [PDF]

Nanophotonics
Jiang L, Li Y, Yang H, Liang S, Zheng L, Qin Z, Zhu Z, Chen H, Wang J, Qu S.   +9 more
europepmc   +1 more source

4D-printed intelligent reflecting surface with improved beam resolution via both phase modulation and space modulation. [PDF]

Microsyst Nanoeng
Kim K, Phon R, Park E, Lim S.
europepmc   +1 more source

An innovative in-body adjustable triple-band Notch UWB monopole antenna with improved bandwidth performance. [PDF]

Sci Rep
Abdollahvand M, Khorshidi M, Sobhi-Givi S, Ghosh S.   +3 more
europepmc   +1 more source

Incident Angle Sensing and Adaptive Control of Scattering by Intelligent Metasurface. [PDF]

Adv Sci (Weinh)
Liu YH, Li XH, Zhang ZT, Qi KN, Lu L, Wang SY, Li YB.   +6 more
europepmc   +1 more source

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Semiconductor Surface Varactor

Bell System Technical Journal, 1962
The semiconductor varactor using surface space charge is analyzed and measurements made on several experimental units are described. The chief characteristics of this device are its capacity-voltage dependence and its negligible dc conduction. The particular system used in this work is a thermally grown oxide on silicon.
exaly   +2 more sources

Carbon nanotube network varactor

Nanotechnology, 2015
Microelectromechanical system (MEMS) varactors based on a freestanding layer of single-walled carbon nanotube (SWCNT) films were designed, fabricated and tested. The freestanding SWCNT film was employed as a movable upper patch in the parallel plate capacitor of the MEMS.
A A, Generalov, I V, Anoshkin, M, Erdmanis, D V, Lioubtchenko, V, Ovchinnikov, A G, Nasibulin, A V, Räisänen   +6 more
openaire   +5 more sources

Microwave plasma varactors

1966 International Electron Devices Meeting, 1966
A low-loss, low-noise plasma varactor has been developed. This is a variable microwave reactance produced by means of a low pressure, highly efficient gas discharge. This device compares favorably with ferrite or semiconductor devices as far as rf losses and average rf power handling capability are concerned. A low-loss phase shifter has been developed
J.Y. Wada, R.C. Knechtli, B.J. Forman
openaire   +1 more source

Novel heterojunction varactors

Proceedings of the IEEE, 1992
Several varactor structures that have been proposed for millimeter- and submillimeter-wave receiver systems are described, and their performance in a harmonic multiplier is compared. The performance is calculated using a nonlinear large-signal analysis program. >
M.A. Frerking, J.R. East
openaire   +1 more source