Results 51 to 60 of about 152,070 (212)
Filtenna with Frequency Reconfigurable Operation for Cognitive Radio and Wireless Applications
Micromachines, 2023 A reconfigurable wideband monopole antenna is introduced in this paper for cognitive radio and wireless applications. The reconfigurability was achieved by four varactor diodes embedded in the band pass filter (BPF) structure which was integrated with ...
Mahmoud A. Abdelghany +3 more
doaj +1 more source
Kaleidoscopic Electromagnetic Wave Manipulation via a Universal Reconfigurable Metasurface Platform
Electron, EarlyView.A multidimensional reconfigurable metasurface enables independent control of the amplitude, phase, polarization, and spectral responses of reflected electromagnetic (EM) waves. Integrating spatial, polarization, and spectral manipulation within a single platform, it provides a versatile solution for intelligent EM systems, next‐generation wireless ...
Wanting Tong +9 more
wiley +1 more source
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose Ultra‐high field (≥ 7 T) and 3 T MRI suffer from B1+ inhomogeneity and signal loss. Conventional metasurfaces that mitigate B1+ inhomogeneity and improve image SNR are “fixed” in nature and designed for a single Larmor frequency. This study demonstrates the feasibility of an adaptive metasurface utilizing voltage‐controlled capacitors ...
Paul S. Jacobs +7 more
wiley +1 more source
Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 4, December 2026.ABSTRACT Safe and reliable communication infrastructure for advanced air mobility requires an intelligent and adaptable propagation channel. Electromagnetic meta‐materials, especially meta‐surfaces such as the reconfigurable intelligent surface enable such intelligence allowing programmability with multiple modes of electromagnetic wave manipulation ...
Roshan Antony Gomez, Michael Kaliske
wiley +1 more source
Scalable Multi‐Target Illusion via a Segmented Spatiotemporal Metasurface
Nanophotonics, Volume 15, Issue 19, 13 October 2026.An electromagnetic kaleidoscope is realized with a segmented spatiotemporal metasurface that transforms one physical aperture into multiple independently controlled false targets. Parallel‐sequence spectral translation codes apparent range and velocity, while segment allocation regulates echo amplitude. Experiments at 5 GHz generate two to five targets
Yujie Hong +10 more
wiley +1 more source
Varactor-Based Continuously Tunable Microstrip Bandpass Filters: A Review, Issues and Future Trends
IEEE AccessElectronically tuned bandpass filters are crucial frequency-selective devices in tunable RF front-ends and are extensively utilized in the fields of communications and sensing.
Mengjie Qin +6 more
doaj +1 more source
Scientific Reports, 2022 This paper proposes the step-by-step design procedure for obtaining independent dual band-notch performance, which provides a valuable method for designing tunable dual band-notched UWB antenna.
Zhang Chao +5 more
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Advanced Optical Materials, Volume 14, Issue 40, 27 October 2026.A theory‐guided magnetoelectric metasurface design breaks the conventional optical transparency and electromagnetic performance trade‐offs. By preserving the electric and magnetic current paths required for efficient reflection through fine‐metal‐line structure, the developed transparent reflective metasurface achieves high optical transparency without
Mina Feizi +5 more
wiley +1 more source
An investigation of a varactor-diode modulator Technical report no. 3 [PDF]
, 1964 Low frequency modulator design using single varactor diode as switching ...
Summer, H. M.
core
Ultra-wideband bandpass microstrip filter with electronically tunable notch-band
e-Prime: Advances in Electrical Engineering, Electronics and EnergyThis paper introduces a compact ultra-wideband (UWB) microstrip filter featuring both a fixed and an electronically tunable notch band. Operating within the frequency range of 3.27 GHz to 5.61 GHz, the filter incorporates a permanent notch at 4.08 GHz ...
Dattatray S. Bade, Sudhakar S. Mande
doaj +1 more source