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The demand for flip chip devices is rising to meet increasingly strict requirements for smaller package size, multiple-die stacking and higher interconnection densities. There are, however, two major issues facing the flip chip process, which are reliability impact by the stresses induced in the solder joints during reflow and high cost for underfill process and materials. Current alternatives to...
For space-qualified vapor-cell atomic clocks, the pressure-shift coefficient describes the frequency change as the device transitions from atmospheric pressure to vacuum. Two processes are known to affect this frequency change: a thermal pathways mechanism and a resonance-cell volume mechanism (i.e., the so-called barometric frequency shift). Here, we focus on the barometric frequency shift, and employ...
This paper presents a novel wideband quasi-Yagi microstrip antenna with bowtie active elements. Good impedance matching and mode transforming are realized by using a microstrip line-to-slotline transition. In this design, a passive reflector and two passive rectangle directors are used to obtain End-fire radiation patterns. After FDTD and FEM simulations, a good agreement between them validates the...
Highway bridges are subjected to the dynamic tire forces of moving vehicles. This paper attempts to identify local damages in box-girder highway bridges from the dynamic responses induced by passing vehicle. The box-girder bridge is modeled using four-node iso-parametric flat shell element taking into account the transverse shearing deformation in the finite element model. The vehicle is modeled as...
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