Results 51 to 60 of about 31,794 (223)
, 1973 A composite antenna feed subsystem concentrated in a small area at the prime focus of the parabola of a satellite parabolic reflector accomodates a plurality of frequency bands.
Jakstys, V. J.
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Fat/Water Separation at 7 T Using a 3D Radial Sequence With Quasi‐Continuous Echo Times
Magnetic Resonance in Medicine, Volume 96, Issue 1, Page 96-108, July 2026.ABSTRACT Purpose To achieve a reliable fat/water separation (FWS) at 7 T using a new 3D radial sequence and reconstruction workflow with quasi‐continuous TE sampling. Methods A 3D radial density‐adapted sequence with quasi‐continuous TE sampling was developed for a 7 T whole‐body MRI system.
Matthias Rohe +9 more
wiley +1 more source
First Detection of the Enigmatic Low Latitude 150‐km Echoes in the UHF Band
Geophysical Research LettersThrough applying a 4‐MHz linear frequency modulation waveform, which has high range resolution and signal intensity, we successfully detected for the first time the ionospheric 150‐km echo enhancement at 430–450 MHz of the Ultra‐High‐Frequency (UHF) band
Xinan Yue +8 more
doaj +1 more source
Broadband circularly polarized antennas for UHF SATCOM [PDF]
, 2011 Novel circularly polarized (CP) antenna configurations derived from Moxon type antenna (bent dipole element over a ground plane) for broadband VHF SATCOM applications.
Manzhura, Oksana +3 more
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A Numerical Alternative to MR Thermometry for Safety Validation of Multi‐Channel RF Transmit Coils
Magnetic Resonance in Medicine, Volume 96, Issue 1, Page 469-484, July 2026.ABSTRACT Purpose This study proposes a numerical technique to estimate peak local specific absorption rate (SAR) uncertainty of multi‐channel RF coils during the process of safety validation as an alternative to experimental temperature and electric‐field measurements, and demonstrates its use to enable human studies at 10.5 T.
Alireza Sadeghi‐Tarakameh +14 more
wiley +1 more source
IEEE AccessA low-profile, dual-band tag antenna (39 mm $\times 39$ mm $\times 1.38$ mm), which is loaded with a circular patch at the central region for frequency tuning purposes, has been proposed for on-metal applications that operate in the Lower European ...
Muthukannan Murugesh +3 more
doaj +1 more source
Evaluation of prediction accuracy for the Longley-Rice model in the FM and TV bands [PDF]
, 2013 Accurate geographical coverage predictions maps for FM and TV are needed for channel and frequency allocations and in order to avoid unwanted interferences.
Bizopoulos, Aristotelis +4 more
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Calibration‐Free GRAPE pTx Pulses for Homogeneous Spatial‐Selective Excitation at 7T
Magnetic Resonance in Medicine, Volume 95, Issue 6, Page 3104-3115, June 2026.ABSTRACT Purpose Extend the universal pulse GRAPE formalism to pulses with a defined spectral response, and apply the concept to spatial selection. Methods We added Bloch simulations at several frequencies for each voxel to the pulse calculation to create universal spectrally‐selective GRAPE pulses.
Daniel Löwen +6 more
wiley +1 more source
Multimode/Multifrequency Low Frequency Airborne Radar Design
Journal of Electrical and Computer Engineering, 2013 This work deals with the design of multimode/multifrequency airborne radar suitable for imaging and subsurface sounding. The system operates at relatively low frequencies in the band ranging from VHF to UHF. It is able to work in two different modalities:
Sandra Costanzo +13 more
doaj +1 more source
Analysis of Signal Attenuation in UHF Band
Advances in Electrical and Electronic Engineering, 2015 This paper deals with signal attenuation in ultra-high-frequency bands caused by rain. We focus mainly on the effect of the rain on the radio waves propagation in the frequency band 2.1 GHz. Two exact approaches for investigating this dependency are used.
Libor Michalek +4 more
doaj +1 more source