In wireless communication systems, passive elements including tunable capacitors and inductors often need high quality factor ( -factor). In this paper, we present the design and modeling of a novel high -factor tunable capacitor with large tuning range and a high -factor vertical planar spiral inductor implemented in microelectromechanical system (MEMS) technology. Different from conventional ...

The effect of flexibility and initial curvature of moving plates in parallel-plate MEMS capacitors are investigated. A parallel-plate-based MEMS tunable capacitor with extended tunability and linear capacitance-voltage (C-V) response is introduced. The design combines the flexibility and curvature of the electrode with an array of mechanical stoppers to increase the overall stiffness of the dev...

Capacitive Micro-machined Ultrasonic Transducers (CMUTs) are the ultrasonic devices which produce better features in contrast to piezoelectric transducers. The intrinsic parameter of CMUT varies with the variation in geometrical dimension of the device. The cavity height and the radius of the CMUT with circular membrane is varied in the lumped parallel plate model for its impact on the paramete...

The response of a polysilicon parallel-plate electrostatic actuator to AC signals at diierent bias voltages has been measured with a laser interferometer. Using microhinges, large plates (with areas from 100m 2 to 0:1mm 2) with long thin support beams (such as 60031:5m 3) are rotated oo the surface of the substrate to form a parallel-plate capacitor. Fabricated structures having 100m gaps can b...

A novel technique is presented for the accurate, rapid, high frequency, predictive modeling of parallel plate capacitors with gridded plates manufactured in a multilayer low temperature cofired ceramic (LTCC) process. The method is empirical in nature and is based on the concept of incrementally constructing the model for a structure from well characterized individual building blocks. Building ...

In this paper we analyse a number of teaching paradoxes of classical electrodynamics, dealing with the relativistic transformation of energy and momentum for a fluid medium in an external electromagnetic field. In particular, we consider a moving parallel plate charged capacitor, where the electric attraction of its plates is balanced by the pressure of gas convicted between the plates.

A linear capacitor structure using fractal geometries is described. This capacitor exploits both lateral and vertical electric fields to increase the capacitance per unit area. Compared to standard parallel-plate capacitors, the parasitic bottomplate capacitance is reduced. Unlike conventional metal-to-metal capacitors, the capacitance density increases with technology scaling. A classic fracta...

A vacuum photodiode is constructed in the form of a parallel plate capacitor with plate separation d. A battery maintains constant potential V between the plates. A short laser pulse illuminates that cathode at time t = 0 with energy sufficient to liberate all of the surface charge density. This charge moves across the capacitor gap as a sheet until it is collected at the anode at time T . Then...