We report a flexible and versatile microcontact printing process using a micromachined elastomeric PDMS (poly-dimethylsiloxane) stamp with two-dimensional arrays of pyramidal tips. The PDMS stamp was molded from a bulk-etched single-crystalline silicon master. By changing the contact pressure, arrayed dot patterns with different dot sizes (from submicron to a few microns) were obtained controllably with one single PDMS stamp. Variable density of dot patterns was also achieved in a 'step-print' manner by conducting multiple printing on a transitional stage. This technique is expected to be useful in many nano-and biotechnology applications, including single cell and neuron studies.
This paper describes a process for batch manufacturing, assembly, and packaging of metal alloy microrelays directly on printed circuit board (PCB) substrates for high-power radio frequency (RF) applications. Stainless steel cantilevers with Pt-Rh tips are mounted on Rogers 4003 PCB substrates to demonstrate the approach. A multilayer PCB design allows for the use of subsurface metal layers to transmit the RF signal into and out of the sealed encapsulation. The electrostatically actuated microrelays with 8.4-mm 2 footprints have 78-V pull-in voltage and 1.1-Ω ON-state resistance. Packaged microrelays exhibit down-state insertion loss and up-state isolation better than −0.25 and −15 dB, respectively, for frequencies up to 5 GHz. Packaged devices remain functional up to 20-W RF power under hot switching conditions. The high power lifetime of the microrelays is 10 913 cycles for 1-W incident RF power in 1-s pulses and 8414 cycles for 10-W incident RF power in 0.1-s pulses. The impact of device encapsulation and multilayer PCB substrate on device performance is addressed.[
2011-0284]Index Terms-Batch fabrication, high power, package, printed circuit board (PCB), radio frequency (RF) microrelay.
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