Results 101 to 110 of about 4,061 (210)

Tapered Yagi-Uda Nanoantennas for Broadband Unidirectional Emission

, 2012
We demonstrate experimentally the operation of tapered Yagi-Uda nanoantennas for broadband unidirectional emission enhancement. The measured transmittance spectra show that, in comparison to untapered reference structures, the tapered nanoantennas ...
Biagioni, Curto, Giannini, Kosako, Maksymov, Maksymov, Maksymov, Maksymov, Miroshnichenko, Novotny, Pavlov, Rosa   +11 more
core   +1 more source

High-spectral resolution solar microwave observations [PDF]

The application of high-spectral resolution microwave observations to the study of solar activity is discussed with particular emphasis on the frequency dependence of microwave emission from solar active regions.
Hurford, G. J.
core   +1 more source

A Multi-Frequency Omnidirectional Antenna Based on a Ring-Shaped Structure. [PDF]

Micromachines (Basel), 2023
Guo H, Chen Y, Wu Q, Wang J, He Y, Cao Y, Li M.   +6 more
europepmc   +1 more source

Wide area coverage radar imaging satellite for earth applications [PDF]

A preliminary study was made of a radar imaging satellite for earth applications. A side-looking synthetic-aperture radar was considered and the feasibility of obtaining a wide area coverage to reduce the time required to image a given area was ...
Ramler, J. R., Stevens, G. H.
core   +1 more source

Microminiaturization of Multichannel Multifrequency Radiographs. [PDF]

Biomed Eng (NY), 2022
Gudkov AG, Vesnin SG, Leushin VY, Sidorov IA, Solov'ev YV, Tikhomirov VG, Sedankin MK, Chizhikov SV.   +7 more
europepmc   +1 more source

Medical Antennas for Microwave Radiothermometry of Biological Objects. [PDF]

Biomed Eng (NY), 2023
Sedankin MK, Leushin VY, Agasieva SV, Gudkov AG, Vesnin SG, Porokhov IO, Gudkov EA, Osipova AV, Antonenkova AY.   +8 more
europepmc   +1 more source

Ultra-Wideband Compact Fractal Antenna for WiMAX, WLAN, C and X Band Applications. [PDF]

Sensors (Basel), 2023
Marzouk M, Rhazi Y, Nejdi IH, Zerrad FE, Saih M, Ahmad S, Ghaffar A, Hussein M.   +7 more
europepmc   +1 more source

Multifrequency Antennas for CubeSats

In the context of the 3Cat-8 mission, a CubeSat standard nanosatellite under development at the NanoSat Lab (UPC), the conception, design, and measurement of a prototype have been carried out. This prototype includes one of the essential elements for communications: the antennas.
openaire   +1 more source

Manipulations of multi-frequency waves and signals via multi-partition asynchronous space-time-coding digital metasurface. [PDF]

Nat Commun, 2023
Wang SR, Dai JY, Zhou QY, Ke JC, Cheng Q, Cui TJ.   +5 more
europepmc   +1 more source

Satellite Interference Source Direction of Arrival (DOA) Estimation Based on Frequency Domain Covariance Matrix Reconstruction. [PDF]

Sensors (Basel), 2023
Yao J, Zhao C, Bai J, Ren Y, Wang Y, Miao J.   +5 more
europepmc   +1 more source