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A slow-wave structure (SWS) consisting of a planar helix with straight-edge connections and incorporating a coplanar waveguide feed has been designed for operation at W-band and has been fabricated using microfabrication technique. On-wafer cold measurements have been carried out on a number of fabricated SWSs, and the results are reported here for the first time. The parameters measured are return...
In this paper, the behavior of BGA solder joints microstructures was studied as a function of Ni doping in SAC solder. Three kinds of solder compositions were selected including Sn3.0Ag0.5Cu, Sn1.0Ag0.5Cu and Sn1.0Ag0.5Cu0.02Ni to value the influence the effect of Ni doping, OSP and Au/Ni pad was employed on the PCB side. Emphasis was placed on studying the effect of low level doping with Ni on the...
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