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The thin radio-frequency (RF) absorber constructed with an artificial magnetic conductor (AMC) surface is used as a sensor array to measure incident 2-d RF field (amplitude and phase) distributions. The AMC surface employs a 2-d dense array of mushroom-type square metal patches on a dielectric substrate. Incident waves are absorbed by the lumped resistors interconnecting the metal patches on the surface,...
Ferroelectric thin film bulk acoustic wave resonators (FBARs) have been of growing interest due to their electric field dependent properties. Resonators based on the ferroelectric barium strontium titanate (BaxSr(1−x)TiO3, BST) are intrinsically switchable, namely they have resonances that switch on with the application of a dc bias voltage. In this paper, the large signal performance and nonlinear...
Ion mobility sensor based on photo-ionization light source for sensing trace gas and volatile organic compounds is proposed. This paper describes modeling and experimental studies carried out with the differential ion mobility sensor for detection of ammonia gas. Preliminary studies were performed and the state of ionization of NH3 gas was studied through a differential voltage measurement system...
This paper deals with dielectric charging phenomenon - a key failure mechanism for electrostatically actuated MEMS. Conduction mechanisms and trap properties of silicon nitride are investigated by current-voltage measurements on Metal-Insulator-Metal (MIM) capacitors and RF MEMS capacitive switches. Both structures show a similar behavior with two bulk-controlled conduction mechanisms: space-charge-limited...
Recent progress in high current photodiodes now makes it possible to linearly detect over 250 mA at frequencies into X Band. This paper will discuss recent improvements in both PD power and linearity.
Impulse damage may occur to insulators within electrical systems due to lightning strikes, switching operations or self-clearing flashovers. This damage may not result in immediate failure of the system; however, progressive degradation can occur due to repeated events. If it is possible to develop economical systems to monitor the effects of impulse degradation of solid insulation, it may be possible...
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