Results 21 to 30 of about 4,766 (228)

PIFA based reconfigurable multiband antenna for wireless applications [PDF]

, 2010
Copyright @ 2010 IEEEA compact reconfigurable four bands Planar Inverted-F Antenna (PIFA) is presented for Digital Video Broadcasting - Handheld (DVB-H), Universal Mobile Telecommunications System (UMTS), Global System for Mobile Communications (GSM800 ...
AbuTarboush, HF, Nilavalan, R, Peter, T
core   +1 more source

Dynamic Metasurface Reflectors Based on Coupled Resonators for Simultaneous Magnitude and Phase Control

IEEE Access, 2023
A novel metasurface reflector unit cell based on two coupled resonators is proposed and demonstrated for real-time reconfigurable beamforming in the X-band (8-12 GHz). The unit cell is composed of a split-ring resonator (SRR) with tunable capacitance and
Mohamed K. Emara, Debidas Kundu, Keigan Macdonell, Leandro M. Rufail, Shulabh Gupta   +4 more
doaj   +1 more source

Parametric Amplification/Mixing Using the Varactor Diode

Active and Passive Electronic Components, 1996
This paper deals with the large-signal analysis of parametric amplification/mixing using reverse biased p-n junction varactor diodes. Expressions are obtained for the current components of the parametric amplification/mixing.
Muhammad Taher Abuelma'atti
doaj   +1 more source

Harmonic Generation by Nondegenerate P-N Junction Varactor Diodes

Active and Passive Electronic Components, 1997
This paper deals with the large-signal analysis of nondegenerate p-n junction varactor diodes. Expressions are obtained for the harmonics of the varactor diode current when driven by a sinusoidal voltage signal. The special case of relatively small input
Muhammad Taher Abuelma'atti
doaj   +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, Yongle Wu, Cuiping Yu, Yuanan Liu   +3 more
doaj   +1 more source

Anti-Series Varactor Network With Improved Linearity Performances in the Presence of Inductive and Capacitive Parasitics

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, Jean-Jacques Laurin, Nicolas G. Constantin   +2 more
doaj   +1 more source

Millimeter-Wave Diode-Grid Frequency Doubler [PDF]

, 1988
Monolithic diode grid were fabricated on 2-cm^2 gallium-arsenide wafers in a proof-of-principle test of a quasi-optical varactor millimeter-wave frequency multiplier array concept.
Chen, Howard Z., Jou, Christina F., Lam, Wayne W., Luhmann, Neville C., Jr., Rutledge, David B., Stolt, Kjell S.   +5 more
core   +1 more source

Dual Band Filter-Antenna with Fixed Low Band and Frequency-Agile High Band for Wireless Communications

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

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, Hutchison, James M S, Lurie, David J   +2 more
core   +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, J. Machac, S. Beldi, L. Latrach   +3 more
doaj