Results 71 to 80 of about 4,744 (216)
Tunable terahertz filter/antenna-sensor using graphene-based metamaterials
Materials & Design, 2022 In this paper, a novel tunable graphene-based bandstop filter/antenna-sensor is presented. This structure is an integrated module that can be used to combine filtering and high-gain radiation performance.
Meisam Esfandiyari +5 more
doaj +1 more source
Machine Learning‐Driven Cooling Window Design Beyond Hyperbolic Metamaterials
Nanophotonics, Volume 15, Issue 4, 24 February 2026.Machine learning‐driven inverse design enables ultrathin metal/dielectric cooling‐window coatings that outperform analytical hyperbolic metamaterials under identical material and thickness constraints. Optimized aperiodic multilayers simultaneously enhance visible transparency, near‐infrared rejection, and color tunability, demonstrating a practical ...
Seok‐Beom Seo +6 more
wiley +1 more source
Adapting Mixer Metamaterials With a Metasurface Absorber
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.This study investigates mixer metasurfaces, which use a top frequency‐selective surface (FSS) mixer and a transmission line local oscillator (LO) layer, to optimise the upconversion of signals. Experimental and simulated results detail how input signals (e.g., 2.1–4.45 GHz) on the LO layer switch diodes on the mixer layer, and the structure is ...
Douglas A. Bowe +2 more
wiley +1 more source
ECCCII-Based Current-Mode Universal Filter with Orthogonal Control of w_o and Q [PDF]
, 2014 This paper presents a new current-mode current-controlled four-input five-output universal filter employing one current-controlled current conveyor (CCCII), one electronically tunable CCCII and two grounded capacitors. The proposed configuration provides
Junnapiya, S. +4 more
core +1 more source
Compact Millimeter-Wave Bandpass Filters Using Quasi-Lumped Elements in 0.13-um (Bi)-CMOS Technology for 5G Wireless Systems [PDF]
, 2019 © 2019 IEEE.A design methodology for a compact millimeter-wave on-chip bandpass filter (BPF) is presented in this paper. Unlike the previously published works in the literature, the presented method is based on quasi-lumped elements, which consists of a ...
Bautista, Meriam Gay +5 more
core +2 more sources
International Journal of Antennas and Propagation, Volume 2026, Issue 1, 2026.Enhancing antenna gain remains a key requirement in modern wireless systems, particularly with the rapid evolution of 5G, emerging 6G networks, satellite links, and high‐resolution radar. Recent research trends increasingly rely on frequency‐selective surfaces (FSSs) and metasurface‐based reflectors, which offer precise electromagnetic wave control ...
A. J. A. Al-Gburi, Mohammad Rezwan Habib
wiley +1 more source
The Class-E/F Family of ZVS Switching Amplifiers [PDF]
, 2003 A new family of switching amplifiers, each member having some of the features of both class E and inverse F, is introduced. These class-E/F amplifiers have class-E features such as incorporation of the transistor parasitic capacitance into the circuit ...
Aoki, Ichiro +3 more
core +1 more source
Cobalt Tungstate Characterization Using Matryoshka‐Structure Filter
Advanced Engineering Materials, Volume 27, Issue 23, December 2025.The green synthesis of cobalt tungstate (CoWO4) using natural polymerizing agents from agar–agar and commercial produces environmentally friendly materials with tunable structural and electromagnetic properties. X‐ray diffraction and Rietveld refinement correlate crystal structure with microwave transmission losses in Matryoshka‐type filters.
Amanda Gomes Barboza +6 more
wiley +1 more source
Signal interference RF photonic bandstop filter
Optics Express, 2016 In the microwave domain, signal interference bandstop filters with high extinction and wide stopbands are achieved through destructive interference of two signals. Implementation of this filtering concept using RF photonics will lead to unique filters with high performance, enhanced tuning range and reconfigurability. Here we demonstrate an RF photonic
Iman, Aryanfar +6 more
openaire +2 more sources
Cascaded wavelength conversions using four-wave mixing in semiconductor optical amplifiers [PDF]
, 1997 Wavelength conversion in wavelength-division multiplexed (WDM) communication systems would provide significant network performance improvement. Optoelectronic, cross-gain saturation, and cross phase saturation wavelength converters are candidate ...
Geraghty, David F. +3 more
core