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This paper investigated the effects of temperature on resonance properties of Film Bulk Acoustic Resonator (FBAR) in thickness-stretch mode. Based on the fundamental piezoelastic equations of piezoelectric material, the vibration equation of ideal FBAR under sine excitation voltage is derived. The solution is then obtained by using of the boundary conditions. The series and parallel resonance frequency...
Inductive Power Transfer (IPT) techniques are gaining more and more interest in wireless power systems. The knowledge of the coupling factor of transmitter (TX) and receiver (RX) coil is a crucial, but mostly during operation not available parameter for such systems. In this manuscript a novel method to determine the coupling factor by measuring the self-resonating frequency of the postringing signal...
This paper addresses estimating the far-field radiated emissions performance, at 10m, from three coupled microstrip lines, in which the coupling length is 5cm, and in which the risetimes of the propagating signals are 2ns. The load for each microstrip line is a 0.01pF capacitive load, and the signaling on the three lines is unipolar, with the propagating voltages switching between 0V and 3V. The nominal...
A planar slow-wave structure (SWS) for application in traveling-wave tubes (TWTs), unconnected pair of planar helices with straight edge connections (PH-SEC), is presented here. Two versions of the unconnected pair, co-wound and contra-wound, are analyzed and compared for the first time. Analysis for both versions is carried out as special cases of a generic structure consisting of 4 parallel unidirectionally...
For the last two decades, significant improvements in charging technologies have been made. Moreover, novel applications have been proposed and tested, obtaining important and promising results. Inductive charging for electric vehicles (EV) and hybrid electric vehicles (HEV) is one of them. Because of the positive impact that this technology represents, it is important to understand the general characteristics...
An analytical model is presented for the double slot coupled cavity slow-wave structure (CCSWS) in this abstract. By matching boundary conditions in conjunction with Green's function techniques and moment method (MOM), the formulae for discussing the high frequency characteristics of the SWS, including dispersion and coupling impedance, are given.
The near-field communication channel is mainly determined by the coupling of two resonant loop antennas and their HF system properties. Such properties change dynamically during operation, affecting significantly power transfer and communication performance. Both these effects are related to an impedance mismatch which arises due to a varying coupling factor. In this paper we present a Matlab-based...
The purpose of the paper is to model cable bundles in the high frequency range. The principle of the model is based on the combination of the Vabre's and Branin's equations. The calculation uses the Kron's method applied to EMC. The calculation results are checked by experimental tests.
Governing partial differential equations are derived for multiple parallel plane structure in frequency-domain. The equations can be considered as an extension of broadband equations derived earlier for one pair of planes and as an extension of well-known 2D Telegrapher's equations originally derived for analysis of narrow-band microwave planar circuits. The broadband equations have appropriate high...
The paper presents analytical design methodology for realizing dual-band phase offset line using multi-section coupled lines. The circuit is designed to emulate a transmission line of 50 Ω characteristic impedance with two different arbitrary phases at the two frequencies. A prototype has been design at 1960 /3500 MHz that is used in dual-band Doherty power amplifier operating for CDMA and WiMAX applications.
The design of microwave filters and multiplexers usually starts from the synthesis of a coupling matrix M. The elements of the main diagonal identify invariant reactances that shift the resonant frequency at resonator nodes, and are usually zero at port nodes. However the analysis of the coupling matrix show that non-zero elements are allowed too. This work show that this reactances can model the...
This paper examines the applications of statistical physics-stochastic processes, ergodic principles, the use of nonlinear dynamic state equations and chaos, and the Wiener-Khintchine theorem to better explain how Intentional ElectroMagnetic Interference (IEMI) disrupts the performance of feedback and hybrid electronic systems such as control systems, power electronics and SCADAs. The origin of spurious...
In this paper the identification of grid connection points is analyzed. These points, also referred to as PCCs (Points of Common Coupling), are used to connect electrical equipment to the grid. The method described in this paper allows to set up a mathematical model for any PCC that reflects its behavior. The grid and input coupling impedances of an equivalent circuit can be determined. The obtained...
The progress of technology in the field of Wireless Power Transfer in the last few years is remarkable. The difference between traditional technology and today's technology is that a transforming power across large air pas can be achieved through recent research. Much electric equipment is proposed- both small one and large. For example, Wireless Power Transfer for small equipment (mobile phone and...
The “hot” dispersion equation for the sheet electron beam (EB) in the coupled combs with symmetric (in-phase) wave had been derived and analyzed. For the first time, had been obtained expressions for the coupling and depression coefficients of the sheet EB in a planar TWT. The obtained results demonstrate the increase in the interaction effectiveness confirming the advantage of the sheet EB application.
Distributed Flexible AC Transmission System (D-FACTS) devices offer many potential benefits to power system operations. This paper illustrates the flexibility of control that is achievable with D-FACTS devices. The impact of installing D-FACTS devices is examined by studying the sensitivities of power system quantities such as voltage magnitude, voltage angle, bus power injections, line power flows,...
The system of integral-differential equations relative to the surface ones of the equivalent magnetic current on the coupling hole of the electromagnetic volumes and the electrical current on the impedance body of finite sizes, induced by the set impressed sources of the electromagnetic field, has been obtained. The approximate analytical solution of the obtained equations system for the narrow slot...
Modern induction furnace draws heavy current with considerable distortion in the current waveform. This heavy distorted current causes distortion in the system voltage. Owing to the insulation limitations at 11 KV line, it is very taxing for modern power quality analyzers to capture the exact distorted voltage waveform. However the distorted waveform of current with high amplitude, drawn by induction...
The automatic control of the matching impedance in chip-to-chip interconnections is described. The proposed method is based on an optimization algorithm that uses the sign of error and the sign of the coupling branch current. A possible implementation of the system is described and computer simulations at the behavioral level are presented.
The application of modal transformation models for transmission lines have been analyzed extensively because in mode domain there are facilities in representation of frequency dependent line parameters. Because the determination of exact modal transformation matrices for general cases is not a simple task, simplifications about these applications can be considered. Using non-transposed three-phase...
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