Results 121 to 130 of about 261,750 (352)
Reflex feed system for dual frequency antenna with frequency cutoff means [PDF]
, 1978 A reflex feed system is described for a dual frequency antenna such as one which transmits and receives both S and X band signals. The dichroic plate, normally employed for directing X band radiation away from the X band horn, is replaced by a flange ...
Hartop, R. W.
core +1 more source
A new hybrid method for the analysis of surrounded antennas mounted on large platforms [PDF]
, 2014 International audienceAn efficient technique to provide fast and accurate analysis of wide-band surrounded antennas mounted on electrically large platforms is presented and validated in this paper. The hybrid method combines Dual-Grid FDTD (DG-FDTD) with
Gillard, Raphaël +5 more
core +4 more sources
Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere
Advanced Engineering Materials, EarlyView.In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May +9 more
wiley +1 more source
Dual-band HF-UHF RFID tag antenna
Electronics Letters, 2009 A dual-band HF and UHF RFID tag antenna with two feeding points is presented, fabricated and measured. A convenient HF resonance is obtained with an HF ASIC chip as well as good impedance matching with UHF ASIC chip in the European RFID UHF band. Tuning techniques of the design parameters are proposed, and tag performance in both frequency bands is ...
Iliev, P. +3 more
openaire +1 more source
Advanced Engineering Materials, EarlyView.Cermets (60 vol.% AISI 316L stainless steel, 40 vol.% recycled MgO), intended for use in aluminum electrolysis, were pre‐oxidized in three furnaces with different heating technologies and subjected to a cryolite corrosion test. The different atmospheres influenced the formation of oxide layers, which in turn affected corrosion resistance and ...
Patricia Kaiser +4 more
wiley +1 more source
Design and Investigation of Differential-Fed Ultra-Wideband Patch Antenna with Polarization Diversity [PDF]
, 2016 A novel single- or dual-polarized ultra-wideband (UWB) patch antenna fed by coupled feeding mechanism is proposed. The single-polarized antenna consists of a square ring patch and two ?-shaped patches which are coupled to the radiating patch.
Gao, Steven, Wang, Yanfang, Zhu, Fuguo
core +2 more sources
Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading
Advanced Engineering Materials, EarlyView.The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley +1 more source
Journal of Engineering and Sustainable Development, 2013 In this paper, a compact and low profile internal normal mode helical antenna with dual-frequencies and circular polarization has been proposed. The proposed antenna shows a wider operating bandwidth and it easy to cover the GSM band(890-960 MHz) for ...
Sadiq Kadem Ahmed
doaj
Journal of Microwaves, Optoelectronics and Electromagnetic ApplicationsThe ground plane plays an important role on the performance of a planar inverted-F antenna (PIFA). In this regard, the ground plane modification using slots is proposed in this research to obtain a dual band antenna for WiMAX application.
L. Wakrim, S. Ibnyaich, M. M. Hassani
doaj +1 more source
Time‐Dependent Oxidation and Scale Evolution of a Wrought Co/Ni‐Based Superalloy
Advanced Engineering Materials, EarlyView.This study shows how a new wrought Co/Ni‐based superalloy resists oxidation at 800 ∘$^\circ$C. The oxide scale changes from rough, fast‐growing spinel to a dense, protective chromia–alumina layer. Atom probe analysis reveals tiny refractory‐rich bubbles at the interface that mark the transition to long‐term, diffusion‐controlled protection ...
Cameron Crabb +6 more
wiley +1 more source