A power divider (PD)/ power combiner (PC) with high quality factor and enhanced output ports isolation using substrate integrated waveguide (SIW) technology is proposed. An SIW cavity is designed to provide a high quality factor filtering response and an SMD resistor is attached between two output ports to realize the high isolation. The value of the applied resistor is calculated by using the ...

We have evaluated the ability of three commercially available deformable mirrors to compensate the aberrations of the eye using a model for aberrations developed by Thibos, Bradley and Hong. The mirrors evaluated were a 37 actuator membrane mirror and 19 actuator piezo mirror (OKO Technologies) and a 35 actuator bimorph mirror (AOptix Inc). For each mirror, Zernike polynomials and typical ocula...

This paper describes the design of a hardware/software system for rendering multi-point, localized vibrotactile feedback in a multi-touch musical interface. A prototype was developed, based on the Madrona Labs Soundplane, which was chosen for it provides easy access to multi-touch data, including force, and its easily expandable layered construction. The proposed solution makes use of several p...

A new, simple, and low cost frequency independent phase shifter is presented. The design is based on a simple op-amp phase shifter with programmable floating resistor and programmable capacitor. The phase shift can be varied using the programmable resistor. Compensation for the variation in the frequency is achieved using the programmable capacitor. Experimental and simulation results confirm t...

A switched capacitor circuit which simulates Frequency Dependant Negative Resistor is proposed. The circuit is controlled by three phases clock and needs one unity gain buffer. A comparison among SC FDNRs in other references is shown. SWITCAP simulation of SC filter using these circuits are also shown. Key-Words; Switched-Capacitor(SC) Frequency Dependant Negative Resistor(FDNR) Filter immittan...

Due to their complex tasks micro-systems are affected in their performance by the local variation of material parameters like mechanical, thermal, optical, electronic and electrical properties. As the active areas of micro-systems are not only in the micrometer range, but in the submicron or nanometer range, evaluation of these features has to be carried out with corresponding spatial resolutio...

With the advancements in newer electronic technologies, need for power/battery charges has risen exponentially. Harvesting renewable energy, which can be subsequently used to power these devices is solution consumption problem. In this work, we develop a piezo electric generator, produces energy when person walks on it or presses with his/her feet. This generated then light up LEDs mounted floo...

piezoelectric actuators are widely used in micro manipulation applications. however hysteresis nonlinearity limits accuracy of these actuators. this paper presents a novel approach utilizing a piezoelectric nano-stage as slave manipulator of a teleoperation system. the prandtl-ishlinskii (pi) model is used to model actuator hysteresis in feedforward scheme to cancel out this nonlinearity. a pas...

Availability is one of the most frequently specified quality attributes for computerized systems and the computation of availability requires knowledge about the reliability of the system. Although much research has been devoted to software system reliability, much work remains to be done in identifying ways to predict reliability of assemblies of components. We are designing an experiment for ...