Results 91 to 100 of about 17,978 (221)
UHF RFID antenna impedance matching techniques
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2017 The modified T-match network uses planar inductive strips for conjugate matching Radio Frequency Identification (RFID) Integrated Circuits (RFICs). Narrow and broadband matching techniques and electromagnetic simulations are applied in [1] for specific designs.
Sockolov, Kamron, Arakaki, Dean
openaire +2 more sources
Bandwidth extension of planar antennas using embedded slits for reliable multiband RF communications [PDF]
In this paper a technique is described to extend the impedance bandwidth of patch antennas without compromising their size. This is accomplished by embedding capacitive slits in the rectangular patch with a truncated ground-plane, and exciting the ...
Alibakhshikenari, Mohammad +4 more
core +1 more source
Flip Angle Errors in Actual Flip Angle Imaging Using Polyvinylpyrrolidone/Water‐Based Phantoms
Magnetic Resonance in Medicine, Volume 95, Issue 3, Page 1489-1502, March 2026.ABSTRACT Purpose The aim of this work is to report and investigate unexpected errors in actual flip angle imaging (AFI) applied to phantom fillings based on polyvinylpyrrolidone (PVP). Methods Flip angle maps of PVP/water mixtures with different PVP ratios were acquired at 3 T and 7 T using a 3D cartesian AFI. The influence of spoiling was investigated
Niklas Himburg +4 more
wiley +1 more source
S-Parameter Uncertainties in Network Analyzer Measurements with Application to Antenna Patterns [PDF]
, 2007 An analytical method was developed, to estimate uncertainties in full two-port Vector Network Analyzer measurements, using total differentials of S-parameters.
Yannopoulou, Nikolitsa +1 more
core +1 more source
Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution
International Journal of Antennas and Propagation, 2020 This paper presents two novel UHF RFID near-field reader antennas with uniform vertical electric field distribution. The two antennas have the following common characteristics.
Yanbin Chen +6 more
doaj +1 more source
On orbit validation of solar sailing control laws with thin-film spacecraft [PDF]
, 2017 Many innovative approaches to solar sail mission and trajectory design have been proposed over the years, but very few ever have the opportunity to be validated on orbit with real spacecraft. Thin- Film Spacecraft/Lander/Rovers (TF-SL Rs) are a new class
Baoyin, H +4 more
core
Fabrication and Characterization of Flexible Spray-Coated Antennas
IEEE Access, 2018 This paper investigates the potential of using spray coating as a methodology for flexible antenna fabrication. The methodology has advantages compared with other antenna-printing techniques, such as screen-printing and gravure printing (more flexibility
Arno Thielens +4 more
doaj +1 more source
IEEE Open Journal of Antennas and PropagationThe efficient series connection of planar leaky-wave antennas (LWA) to obtain directive frequency beam scanning, is proposed in this paper. Conditions for the proper performance are here derived, showing that the distance between antennas must be ...
Miguel Poveda-Garcia +4 more
doaj +1 more source
Analysis of non uniform surface current distribution on thick and thin wire antenna [PDF]
, 2013 When wires are closely parallel, the surface current distribution becomes non uniform. Normal mode helical antenna is choosing in particular in order to study the effect of surface current distribution along its segmentation from the excitation ...
Abd. Rahman, Rais Rabani
core
International Journal of Antennas and Propagation, 2016 Several antenna designs have been made in order to obtain a novel electrically small 3D UHF spherical antenna (ka = 0.1916), which has a resonance frequency close to 915 MHz, produces a quasi-isotropic radiation with an opening angle equal to 360° in the
Abdelhamid Bou-El-Harmel +2 more
doaj +1 more source