MEMS Technology for Medical Applications
Recent design and development of MEMS-based chips by medical research scientists have demonstrated their potential applications for detection and treatment of neurological disorders, epilepsy, seizures, and Parkinson's disease. Neurosurgeons have been successful in quelling epileptic seizures by electrically jolting the vagus verve, one of the twelve pairs of nerves that emerge from the brain instead of spinal cord 9 . Magnetic seizure therapy uses a powerful electromagnet instead of repetitive...
MEMS Technology for Satellite Communications and Space Systems Applications
Wireless satellite communications and space-based sensors are the major beneficiaries of the MEMS technology. Minimum size, power consumption, and high reliability are the critical requirements for both the applications, which can be satisfied by deploying MEMS-based devices and sensors. MEMS technology conserves energy and minimizes power consumption, weight, and size. RF-MEMS devices such as switches, phase shifters, switched antennas, filters, and amplifiers have become critical to...
FreeFree Beam HighQ MicroResonators
As stated earlier that the FFB micro-resonators incorporating the basic flexural-mode beam design offer several benefits such as high stiffness, lower anchor losses, large dynamic range, and high power-handling capability 3 . These performance parameters are most desirable for covert communications applications, where large suppression of interference in adjacent channels is of critical importance. Critical components of an FFB micro-resonator are shown in Figure 8.5a. FFB micro-resonators with...
Fabrication and Material Requirements for the Actuator
Test tower requires the use of structural materials with high values of Young's modulus, which can offer wide displacements ofthe electrochemical actuators needed for fast actuator response. The overall performance ofthe actuator is contingent upon the strain uniformity along the length of the beam and the actuator outer surface of the nanotubes. If all the shells of the MWCNT array could be made to actuate at the same time, the force generated by the electrochemical actuator will be maximum....
Introduction Ygw
Distributed MEMS transmission-line DMTL circuits and elements are widely used in the design and development of filters, traveling-wave amplifiers, nonlinear transmission-line segments, matching circuits, and phase shifters. Deployment ofperiodic-loaded transmission line offers very wideband operations in microwave and mm-wave spectral regions 1 . For the DMTL configuration, transmission-line geometrical parameters and physical dimensions can be defined to achieve a periodic transmission line...
Bending Moment of the Cantilever Beam
The bending moment expression can be written as d31 is the piezoelectric material coefficient C N or m V EP is Young's modulus of the piezoelectric material b is the beam width hC is the carrier material thickness V is the actuation or applied voltage Note Equation 2.9 yields excellent results, when the piezoelectric layer thickness is much thinner than the carrier layer thickness. Computed values of tip deflection and bending moment as a function of various parameters for three distinct...
MEMS Varactor Design Aspects and Fabrication Requirements
MEMS technology has the potential of realizing RF variable capacitors with a performance that is superior to conventional solid-state aviator diodes in terms of nonlinearity, flicker noise, and losses. An electrostatically actuated MEMS bridge offers a MEMS parallel-plate PP variable capacitor that can be achieved with simple fabrication, higher yield, and minimum cost. It has built-in capability for tuning over bandwidths exceeding 100 percent at microwave and mm-wave frequencies. A MEMS...
Gauge Factor Computation
As stated earlier that the strain sensors are fabricated from the piezoresistive materials such as silicon or zinc oxide or aluminum nitride. However, silicon is widely used because of its unique properties and availability at minimum cost. There is a fundamental relationship between the resistance change and the mechanical strain developed in the piezoresistive materials. It is important to mention that the resistance change is contingent on the changes in the geometry of the strain gauge. The...
AR Jha PhD
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