Results 61 to 70 of about 142,661 (163)
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, Volume 38, Issue 32, 8 June 2026.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +1 more source
Varactor diode assembly with low parasitic reactances [PDF]
, 1975 Development of varactor diode assembly overcomes parasitic reactances of conventional varactor packages. In specially constructed assembly very high idler-frequency to signal-frequency ratios are used to obtain low-noise operation over maximum ...
Dickens, L. E.
core
2D Materials Empowered Radar Absorbing Materials: A Review
Advanced Electronic Materials, Volume 12, Issue 12, 22 June 2026.Recent progress in 2D materials empowered radar absorbing materials (RAMs) is reviewed, highlighting four key structural design strategies that enhance electromagnetic wave absorption. Porous structures, heterogeneous interfaces, printed metamaterials, and tunable metasurfaces are compared in terms of their governing physics, fabrication complexity ...
Yujie Zhong +4 more
wiley +1 more source
Design of a tunable linearity-enhanced Doherty power amplifier based on varactor diode networks
Engineering Science and Technology, an International JournalThis article presents a tunable linearity-enhanced technique using varactor diode networks (VDNs) to enhance the linearity of Doherty power amplifiers (DPAs) under broadband high peak-to-average power ratio (PAPR) signals.
Yating Li +4 more
doaj +1 more source
AlGaN/GaN varactor diode for integration in HEMTcircuits
Electronics Letters, 2001 The fabrication and characterisation of metal-semiconductor-metal (MSM) diodes above an AlGaN/GaN HEMT layer system for varactor applications are reported. Device fabrication uses standard HEMT processing steps, allowing integration in HEMT circuits without the need of sophisticated growth or etching techniques. Capacitance-voltage measurements exhibit
MARSO, Michel +4 more
openaire +2 more sources
Spoof Surface Plasmon Polaritons in Terahertz Integrated Circuits
Advanced Photonics Research, Volume 7, Issue 5, May 2026.Terahertz integrated circuits (THz ICs) face challenges from wavelength‐scale dimensions and parasitic effects. Spoof surface plasmon polaritons (SSPPs) provide strong confinement and enhanced near fields, enabling novel transmission and modulation mechanisms.
Xuanru Zhang, Ze Kai Wang, Tie Jun Cui
wiley +1 more source
Spectral characterisation of variable reactance devices [PDF]
, 1987 Low Noise Figure communication receivers require more efficient frequency converters. Frequency conversion and multiplication processes cannot take place without the existence of harmonics in the system and the inherent property of a nonlinear element is
Fifa, Ekaterini
core
Computer Applications in Engineering Education, Volume 34, Issue 3, May 2026.ABSTRACT In engineering education, a “fidelity‐accessibility trade‐off” persists: accessible web simulations often lack physical accuracy, while complex industrial tools impose heavy cognitive loads. This hinders effective instruction in semiconductor physics in remote, hardware‐constrained environments.
Ali Akyüz +2 more
wiley +1 more source
Frequency multipliers on semiconductor diode structures
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2018 Obvious advantages of the millimeter wave technology including a large information capacity, high directivity of radiation, diagnostics and spectroscopy capabilities of different environments, including the methods of electron paramagnetic resonance and ...
M. F. Karushkin
doaj +1 more source
Neural Network–Assisted Metasurface Retroreflector With Wide‐Angle Adaptivity
Electron, Volume 4, Issue 2, May 2026.This work proposes a wide‐angle, multi‐polarization, self‐sensing, and self‐adaptive intelligent metasurface retroreflector, with a planar profile and ultrathin thickness. By integrating a pre‐trained artificial neural network (ANN), the metasurface retroreflector can recognize the incident angle and promptly adapt to changes in the incoming wave.
Jing Ning +7 more
wiley +1 more source