Results 21 to 30 of about 4,662 (208)
Independently Tunable Concurrent Dual-Band VCO Using Square Open-Loop Resonator
IEEE Access, 2018 A concurrent dual-band voltage-controlled oscillator (VCO) with independently tunable dual oscillation frequencies is proposed. A shared square open-loop dual-mode resonator and two varactor diodes are the basic units offering flexible tuning for the ...
Boqiong Li +3 more
doaj +1 more source
Observation of modulation instability in a nonlinear magnetoinductive waveguide [PDF]
, 2013 We report numerical and experimental investigations into modulation instability in a nonlinear magnetoinductive waveguide. By numerical simulation we find that modulation instability occurs in an electrical circuit model of a magnetoinductive waveguide ...
Kitano, Masao +2 more
core +2 more sources
IEEE Access, 2021 This paper proposes a varactor-based circuit technique intended for amplitude and phase control, with improved linearity in the presence of parasitic capacitances and parasitic inductances.
David Berthiaume +2 more
doaj +1 more source
Advanced Electromagnetics, 2020 This work proposes a design of compact filter-antenna with fixed and frequency-agile bands for wireless communications and cognitive radio (CR) systems.
H. A. Atallah
doaj +1 more source
Millimeter-wave diode-grid phase shifters [PDF]
, 1988 Monolithic diode grids have been fabricated on 2-cm square gallium-arsenide wafers with 1600 Schottky-barrier varactor diodes. Shorted diodes are detected with a liquid-crystal technique, and the bad diodes are removed with an ultrasonic probe.
Chen, Howard Z. +5 more
core +1 more source
IET Microwaves, Antennas & Propagation, 2019 A novel reconfigurable metasurface beam‐steerable reflector for satellite communication which covers the entire Ku‐band, and supports 300 MHz bandwidth, is suggested in this work. The reflector is based on a new type of electromagnetic bandgap.
David Rotshild, Amir Abramovich
doaj +1 more source
Planar Hexagonal Antenna with Dual Reconfigurable Notched Bands for Wireless Communication Devices [PDF]
Radioengineering, 2021 In this paper, a planar hexagonal antenna with dual tunable notched band using varactor diodes is presented. The designed antenna operates in the frequency range of 2 GHz to 8 GHz and is loaded by a complementary split ring resonator (CSRR) to achieve ...
H. Ayadi +3 more
doaj
Tunable Elliptical Split Ring Resonator Using Single Varactor Diode
Advanced Electromagnetics, 2018 In this paper, the effect of changing the structure of split ring resonator SRR from circular to elliptical shape is presented and tested. The theoretical analysis of circular SRR (CSRR) is tested and its results are compared with the simulated ones ...
A. S. Elkorany +3 more
doaj +1 more source
Device for diode tuning in a stripline varactor harmonic multiplier [PDF]
, 1969 Stripline varactor harmonic multiplier uses a device for positioning the varactor diode with respect to the stripline circuit to obtain series resonance.
Steele, K. P.
core +1 more source
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, EarlyView.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