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In recent times, due to the increased use of the reactive power, it is important to bill the electrical power consumption based on both the active and reactive power components. Reactive power is a very significant factor in electric power systems since it affects the efficiency of these systems. For this reason, the measurement of reactive energy is also important. Several methods are used to measure...
Due to nonlinear loads and other reasons, the power quality gets deteriorated and is of a major significance in recent times. In order to mitigate the problems due to power quality events such as sag, swell, interrupt, etc., good estimation of the parameters of the power quality events is required. Invariably, the power system waveforms get corrupted due to noise also. The estimation of the parameters...
This paper presents a novel concept for design of intelligent multiband mobile array antenna for Software Defined Radio [SDR] applications. This array is incorporated in the metastructure [MS] which is excited by the near field of the parent antenna in hypermode for multiband applications. The design of the MS depends upon these modes at different bands. The MS can be driven by a phase shifting network...
Although several methods are used to measure various power system quantities such as voltage, current and frequency, it is still inadequate for post processing of power quality issues due to the possibility of missing significant events relevant to power quality. Therefore, IEC 61000-4-30 recommends storage of the power system raw waveform samples over a certain period. However, due to the large amount...
Power system frequency is an important parameter in power quality monitoring. Due to nonlinear loads and other problems, the frequency slowly varies around its nominal value of 50Hz. To estimate the instantaneous frequency value, therefore, a dynamic signal model is required. In earlier works, Taylor series is used to model the waveform. The coefficients of the Taylor series are computed using the...
A novel Mobius-coupled printed resonator oscillators is developed in response to replacing expensive DRO (Dielectric Resonator Oscillator) for the application of synthesized signal sources in RADAR and modern microwave communication systems. One of the problems related to the Dielectric Resonator (DR) is miniaturization at lower microwave frequencies and also fabrication in integrated circuit (IC)...
In this paper, we show that two back to back coplanar waveguide (CPW) in the form of Mobius strip has resulted in an infinite transmission line capable of retaining a large bandwidth of frequencies that can be useful for real time signal retention device (RTRD). By providing Mobius twist to CPW, a continuous phase change reported instead of abrupt phase change by using shorting pins between two parallel...
In recent times, the parameters of power systems are highly distorted, due to the increased application of nonlinear loads. The monitoring of harmonic and interharmonic distortion is an essential issue for delivering high quality power. The proposed harmonic and interharmonic estimation algorithm employs a filter bank and multirate signal processing. An enhanced phase-locked loop is used to estimate...
A novel design methodology is illustrated, along with the fabrication technique for a wrap-around antenna in the C band on a conical surface. The methodology illustrates an attempt to achieve broadband performance with a thin conformal antenna. An attempt is also made to fabricate such an antenna on the parent body by a progressive lamination process of the layers. Experimental results are shown for...
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