Topic
RLC circuit
About: RLC circuit is a research topic. Over the lifetime, 14490 publications have been published within this topic receiving 142697 citations.
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Papers
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TL;DR: In this article, the authors present an analytical solution to the feeding mechanism for a microstrip patch antenna fed by a vertical probe, which employs a circular capacitive structure to improve the impedance matching.
Abstract: The goal of this article is to present an analytical solution to the feeding mechanism for a microstrip patch antenna fed by a vertical probe. The feeding mechanism employs a circular capacitive structure to improve the impedance matching, specifically for microstrip patch antennas on thick dielectrics. A circuit model is introduced to find the design parameters. The circuit model includes a series inductor associated with the feeding probe, a parallel plate radial microstrip line, a series radial gap capacitor and an RLC resonator as the patch antenna. A closed form impedance transformation is generated for the parallel plate radial microstrip line. The result of a Schwarz-Christoffel mapping is used to find the radial gap capacitor. The full-wave simulation and measured results are compared with the model and display good agreement.
31 citations
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TL;DR: In this article, the effect of time variation of system impedances and voltage harmonics on the value of optimum capacitor for power factor correction at busses with nonsinusoidal voltage was determined.
Abstract: The goal of this paper is to determine the effect of time variation of system impedances and voltage harmonics on the value of optimum capacitor for power factor correction at busses with nonsinusoidal voltage. Two types of 24 hours time-variation of voltage harmonices and Thevenin impedance are assumed. The equivalent load impedance is also considered time variable and assumed to contain a large proportion of induction motors. The daily energy losses are computed and graphed in function of the shunt capacitance used for power factor correction. The results of this study indicate that in order to avoid resonances and to find the optimum capacitor the time variation of harmonics and system impedances must be known as precise as possible.
31 citations
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TL;DR: In this paper, a magnetic levitation device using an inductive part of a resonant circuit is described, and the system is stabilized by electromechanically coupling an aluminium solid object to the main levitator circuit.
Abstract: Recent investigations of a relatively new magnetic levitation device are described. This device uses an electromagnet, which is the inductive part of a resonant circuit. If the circuit is properly tuned, static stability is attainable. Levitators built on these lines are simple and reliable. However, it is already well known that a tuned circuit electromagnet on its own is usually not sufficient to maintain levitation for long periods of time, and the suspended object tends to be dynamically unstable. This dynamic instability is prevented by introducing simple electronic or mechanical modifications into the tuned circuit system. Such modifications are described and their investigation is dealt with. The electronic method of stabilization is successfully analyzed by employing the viewpoint of slowly varying quantities. It is believed that the present article is the first to suggest mechanical methods for introducing dynamic stabilization to levitators. It is interesting that mechanical stabilization is achieved without a necessity of employing direct mechanical contact, and the levitated object is suspended freely. The system is stabilized by electromechanically coupling an aluminium solid object to the main levitator circuit.
31 citations
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10 May 2001
TL;DR: In this paper, an adjusting method for an antenna resonance circuit which optimizes the reception state of a non-contact IC card and the non contact IC card using the method is presented.
Abstract: PROBLEM TO BE SOLVED: To provide an adjusting method for an antenna resonance circuit which optimizes the reception state of a non-contact IC card and the non-contact IC card using the method SOLUTION: The antenna resonance circuit 21 receives an electromagnetic wave and a rectifying circuit 22 generates an induced voltage inside; once the induced voltage is detected by reception level detection 25, a modulating/ demodulating circuit 24 detects received data and a frame error rate (FER) and recording to the detected reception level and the value of FER, the resistance and capacitor of the antenna resonance circuit 21 are varied to automatically adjust a quality factor and a resonance frequency
31 citations
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31 Mar 2005
TL;DR: A PLL frequency synthesizer as discussed by the authors includes a voltage-controlled oscillator circuit provided with a capacitor, an inductor, and a variable capacitor element oscillating using the resonance frequencies of the capacitor and inductor.
Abstract: A PLL frequency synthesizer circuit includes a voltage-controlled oscillator circuit provided with a capacitor, an inductor, and a variable capacitor element oscillating using the resonance frequencies of the capacitor and inductor, for outputting the oscillation frequency signal of a variable capacitor element, a negative feedback loop circuit capable of looping the signal output from the voltagecontrolled oscillator circuit and performing a frequency acquisition operation for adjusting the frequency of the signal to a desired locking frequency, a tuning circuit for performing tuning so that the oscillation frequency approaches the locking frequency, by modulating the capacitance value of the capacitor of the voltage-controlled oscillator circuit prior to the frequency acquisition operation, and a reference potential application circuit for applying a reference potential to the variable capacitor element of the voltage-controlled oscillator circuit during the tuning operation performed by the tuning circuit.
31 citations