Results 261 to 270 of about 4,005,914 (318)

Machine‐learning‐based prediction methods for path loss and delay spread in air‐to‐ground millimetre‐wave channels

IET Microwaves, Antennas & Propagation, 2019
The unmanned aerial vehicles (UAVs) have been widely applied in various fields due to their advantages like high mobility and low cost. Reliable communication is the premise to ensure the connectivity between UAV nodes.
Guanshu Yang, Yan Zhang, Zunwen He, Jinxiao Wen, Zijie Ji, Yue Li   +5 more
semanticscholar   +1 more source

A millimetre-wave magnetron

Proceedings of the IEE Part C: Monographs, 1956
The construction and performance of a pulsed-millimetre-wave magnetron are described. The performance is compared with that of a “parent” valve, using Slater's scaling laws, and with theoretical standards. Some problems encountered in designing the valve and in holding close tolerances on the performance are discussed.
openaire   +1 more source

Millimetre wave astronomy

Physics in Technology, 1981
Advances of millimetre wave astronomy are discussed, particular attention being paid to the developments of receivers reflector antennas radiotelescopes and to the selection of suitable observing ...
openaire   +1 more source

Passive millimetre wave imaging

Electronics & Communication Engineering Journal, 1991
The paper discusses the current status of passive millimetre wave radiometry as an imaging technique. The major problems are poor spatial resolution and lack of thermal sensitivity. Techniques for overcoming these difficulties are identified, including the use of aperture synthesis, multichannel receivers, correlation and inverse transform techniques.
R. Appleby, A.H. Lettington
openaire   +1 more source

Techniques for millimetre-wave imaging

SPIE Proceedings, 2004
This paper reviews the formation of an image with coherent and incoherent radiation. It discusses the various mm-wave methods for electronic beam-forming and beam-steering such as phased array, leaky-wave antennas, up-conversion, tapped delay lines and digital beam-forming techniques.
Alan H. Lettington, Dennis Dunn, Naomi E. Alexander, Anas Wabby, Chun-Hong Chen   +4 more
openaire   +1 more source

The generation of millimetre waves

Proceedings of the IEE - Part B: Radio and Electronic Engineering, 1955
Problems in the generation of millimetre waves are considered, and further study of sparked generators is found desirable. A contribution is made to the simple theory of such generators. Experiments made to verify the theory are not wholly successful, but their evidence, together with that of other workers, strongly suggests that this simple theory is ...
openaire   +1 more source

Millimetre-wave spectrum of CF3Br

Journal of the Chemical Society, Faraday Transactions 2, 1982
The millimetre-wave rotational spectra of CF379Br and CF381Br have been measured in the ground and low-lying excited states. Analysis of the ground-state spectra has yielded precise values of the rotational and centrifugal distortion constants, as well as bromine nuclear quadrupole coupling constants.
John H. Carpenter, John D. Muse, John G. Smith   +2 more
openaire   +1 more source

Millimetric Waves Technologies: Opportunities and Challenges

2011
Providing an available wideband and better antenna beam forming are two good profits of millimeter wave (mmWave) technology. MmWave technology makes radio systems lighter and smaller and radars more precise. Today, commercial MmWave equipment work below 90GHz frequencies. MmWave radios work to transport Internet traffic in the backhaul of communication
Jahangir Dadkhah Chimeh, Saeed Bashirzadeh Parapari   +1 more
openaire   +1 more source

Quantum-enabled millimetre wave to optical transduction using neutral atoms

Nature, 2023
Aishwarya Kumar, A. Suleymanzade, M. Stone, L. Taneja, Alexander Anferov, D. Schuster, Jonathan Simon   +6 more
semanticscholar   +1 more source

Improved RF and DC performance in AlGaN/GaN HEMT by P-type doping in GaN buffer for millimetre-wave applications

AEU - International Journal of Electronics and Communications, 2019
In this paper, the RF and DC performance of AlGaN/GaN HEMT having p-type doping in GaN buffer layer was analysed. Novelty of this work lies in the inclusion of P-type doping in GaN buffer of proposed GaN-HEMT.
L. Arivazhagan, D. Nirmal, D. Godfrey, J. Ajayan, P. Prajoon, A. Fletcher, A. A. Jone, J.S. Raj Kumar   +7 more
semanticscholar   +1 more source