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When THz filters are designed, several geometric/material parameters (variables) can affect its properties. In this context, one often meets the task of having to reconstruct a multivariable response-surface in order to determine how the different parameters affect the filter response, which often requires substantial computation time. In this work, we develop a modified bisection method to choose...
This paper reports a novel process for realising freestanding piezoelectric cantilevers printed on fabric for potential use as a wearable sensor. Piezoelectric cantilever structures were fabricated by screen printing a piezoelectric stack on top of a structural layer that is supported by a sacrificial material during printing. The sacrificial layer was subsequently removed in an oven at 160 °C for...
This paper presents the results from a theoretical study on the harmonic emission of a windpark in the frequency range up to 200 kHz. The calculations are based on the transfer function from an individual turbine to the pubic grid, expressed in the frequency domain. The model has been applied to a general windpark, for which a mathematical expression has been derived. The study provides relations...
Response of nanomechanical resonant mass sensors to adsorption does not only depend on the mass loading, but also on the adsorbate stiffness, adsorption induced surface stresses and location. It is therefore clear that with just resonance frequency measurement, decoupling the stiffness and the mass effects is difficult. A recent theory proposed using the electrostatic pull-in instability (EPI), in...
A new wide locking range injection-locked frequency divider (ILFD) using a standard 0.18 μm CMOS process is presented. The ILFD is based on a differential VCO with one injection MOSFET for coupling the external signal to the resonator. The locking range of the ILFD is increased by using a new LC resonator. Measurement results show that at the supply voltage of 0.75 V, the divider's free-running frequency...
Resonant frequency is a key parameter in designing a resonant transducer with high sensitivity. Eigen-frequency calculation of a composite-layer microcantilever is quite useful for the design of a microcantilever resonant sensor. However, simple methods for predicting the resonant frequency of composite rectangular microcantilevers are poorly developed and invite further research. This paper presents...
Nanoelectromechanical cantilevers have achieved unprecedented sensitivity in the detection of displacement, mass, force and charge. Although resonating cantilevers are demonstrated to be excellent mass sensors, environmental effects like humidity, ambient gases and contamination result in uncertainty in the calculation of either adsorbed mass or mechanical properties due to shifts in resonance frequencies...
This paper deduces a remarkably precise analytical formula for calculating the fundamental resonant frequency of V-shaped cantilevers using Rayleigh-Ritz method. This analytical formula, which is very convenient for MEMS sensor design, is then validated by ANSYS simulation. This formula raises a new perspective that, among all the V-shaped cantilevers, the simplest triangular cantilever can lead to...
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