Varactor-Tuned Dual-Mode Frequency Discriminator for Instantaneous Frequency Measurements [PDF]
, 2013 In this paper a novel varactor-tuned frequency discriminator that makes use of two tunable dual-mode microstrip resonators is demonstrated which doubles the discriminator tuning bandwidth.
Hong, Jiasheng +2 more
core +1 more source
Rapid Diagnostics of Reconfigurable Intelligent Surfaces Using Space‐Time‐Coding Modulation
Advanced Functional Materials, Volume 36, Issue 1, 2 January 2026.A fast reconfigurable‐intelligent‐surface (RIS) diagnostics method is proposed based on spatio‐temporal modulation with orthogonal codes. Theoretical analysis demonstrates a clear distinction in code channel power between normal and faulty elements. Simulations validate its feasibility under high fault ratios and varying receiving angles.
Yi Ning Zheng +7 more
wiley +1 more source
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
Integrated-circuit balanced parametric amplifier [PDF]
, 1975 Amplifier, fabricated on single dielectric substrate, has pair of Schottky barrier varactor diodes mounted on single semiconductor chip. Circuit includes microstrip transmission line and slot line section to conduct signals.
Dickens, L. E.
core +1 more source
Design and Applications of Multi‐Frequency Programmable Metamaterials for Adaptive Stealth
Advanced Functional Materials, Volume 36, Issue 5, 15 January 2026.This article provides a comprehensive overview of metamaterials, including their fundamental principles, properties, synthesis techniques, and applications in stealth, as well as their challenges and future prospects. It covers topics that are more advanced than those typically discussed in existing review articles, while still being closely connected ...
Jonathan Tersur Orasugh +4 more
wiley +1 more source
GaAs monolithic frequency doublers with series connected varactor diodes [PDF]
, 1984 GaAs monolithic frequency doublers using series connected varactor diodes have been fabricated for the first time. Output powers of 150 mW at 36.9 GHz with 24% efficiency and 300 mW at 24.8 GHz with 18% efficiency have been obtained.
Atwater, H. A. +4 more
core +1 more source
Design and construction of an actively frequency-switchable RF coil for field-dependent Magnetisation Transfer Contrast MRI with fast field-cycling [PDF]
, 2010 Copyright © 2010 Elsevier Inc.
Choi, Chang-Hoon +2 more
core +1 more source
Linear phase demodulator including a phase locked loop with auxiliary feedback loop [PDF]
, 1976 A phase modulated wave that may have no carrier power is demodulated by a phase locked loop including a phase detector for deriving an A.C. data output signal having a magnitude and a phase indicative of the phase of the modulated wave.
Rippy, R. R.
core +1 more source
Silicon-based distributed voltage-controlled oscillators [PDF]
, 2001 Distributed voltage-controlled oscillators (DVCOs) are presented as a new approach to the design of silicon VCOs at microwave frequencies. In this paper, the operation of distributed oscillators is analyzed and the general oscillation condition is ...
Hajimiri, Ali, Wu, Hui
core +1 more source
LC-VCO design optimization methodology based on the gm/ID ratio for nanometer CMOS technologies [PDF]
, 2011 In this paper, an LC voltage-controlled oscillator (LC-VCO) design optimization methodology based on the gm/ID technique and on the exploration of all inversion regions of the MOS transistor (MOST) is presented.
Fiorelli, Rafaella +2 more
core +1 more source