Micromachined fluid-structure systems capable of acoustic sensing and mechanical frequency analysis are demonstrated. These systems act as passive mechanical acoustic filters. A capacitive sensing scheme is incorporated into the structure to produce 32 channels of filtered output, each sensitive to a particular frequency band. Inspiration for the design is taken from the structure of the mammal...

The tire pressure monitoring system (TPMS) can not only make the driver more safety, but also save fuel and protect the tire. Tire safety is attracting the driver's attention, the United States had developed laws to enforce the TPMS installation in the car. In this paper, the basic structure and the implement method of TPMS are introduced. The SAW theory and some surface acoustic wave (SAW) tem...

modeling and simulation of communication circuits at high frequency are important challenges ahead in the design and construction of these circuits. knowing the fact that the lumped element model is not valid at high frequency, distributed analysis is presented based on active and passive transmission lines theory. in this paper, a lossy transmission line model of traveling wave switch (twsw) i...

introduction:with increasing threats of weapons of mass destruction (wmd) in future war especially biological threats against our country necessity of using novel technologies in crisis management against new warfare’s is very important. passive defense as a peaceful and preventive strategy without any warfare is able to not only monitor the prospect of new warfare specially biological warfare ...