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Copyright (c) 2013 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Copyright and Reprint Permission Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limit of U.S. copyright law, for private use of patrons, those articles in this volume that carry a code at the bottom of the first page, provided that the per-copy...
In this paper, the design and realization of microstrip-based ultra-wideband (UWB) composite bandpass filter (BPF) with short-circuited stubs is presented. The BPF is compositely constructed from the step impedance lowpass filter (LPF) and the optimum distributed highpass filter (HPF). Prior to the realization, the performances of filter and its physical dimension are investigated numerically to obtain...
This paper presents a preliminary study of a novel approximate UTD ray solution of an oblique electromagnetic (EM) diffraction by an impedance discontinuity in a planar surface. The proposed solution is heuristically obtained from the Weiner-Hopf (W-H) solution. This leads the proposed solution relatively simple and closed form expression which is suitable for engineering applications. The comparison...
A new current-mode triangular/square wave generator based on MO-CFTAs (Multiple output current follower transconductance amplifiers) is presented in this paper. The circuit description is very simple, its construction consists of 2 MO-CFTAs and 1 grounded capacitor without any external resistor. The output frequency and triangular/square wave amplitudes can be electronically/independently tuned via...
This paper presents the simulation of capacitor bank switching to evaluate the electrical stress to power circuit breaker. The electrical stress consists of inrush current during closing as well as transient recovery voltage and rate of rise of recovery voltage during opening. The studied cases are base case with ideal voltage source, practical system representing the system by several elements and...
This paper present a design circuit CMOS in 0.5um to detected QCM resonant frequency and QCM peak current for calculate mass weight of load on QCM surface. The QCM resonant frequency was changed by mass on QCM surface and QCM peak current depended on QCM resonant frequency. The differential of QCM resonant frequency (Δf) between QCM unloaded and QCM with loaded on surface can use for calculate mass...
In this paper, optimal power flow based on available transfer capability (ATC) has been proposed for contingent power systems. In general, the total production cost is commonly used as the main objective for optimal power flow problems. However, in some circumstances, where the economical point of views is less important such as under an emergency state of partial blackout, the transmission security...
This paper presents the design and experimental of dual wideband coplanar waveguide (CPW)-fed using stub split-ring rectangular slot antenna operates in WLAN applications. This antenna is designed for dual frequency used in WLAN system coverage IEEE 802.11b/g (2.4–2.4835 GHz) and IEEE 802.11a (5.15–5.35 GHz). The results of the return loss (S11), gain and radiation pattern of the proposed antenna...
The requirement to renovate the deteriorated and aging electrical asset is now playing a significant role on the quality of electrical supply. Thus this paper presents the performance evaluation of 115 kV circuit breaker in power substation. The degraded high voltage circuit breakers should be assessed and clearly identified as supported reasons for planning the renovation task of electrical asset...
Smart grid is a driving force for the development associated with renewable technologies. The use of renewable energy sources for electricity production has been increasingly brought into attention. Basically, the power generated from these sources may cause the fluctuation of the electrical power affecting the quality and reliability of the power system. Therefore, the proportion of electrical power...
This paper presents the design of a linearly polarized pattern reconfigurable antenna whose configuration employs a single feed and a low profile cavity backed slot antenna. The grounded coplanar waveguide feed is adopted to excite the slotted Yagi-Uda structure which is constructed on the substrate integrated waveguide (SIW). The whole antenna is thus completely constructed on a single layer of a...
A parallel-connected negative DC-DC converter using power saving techniques has been proposed in this paper. Unlike conventional negative converters, the proposed converter consists of four negative heap converters connected in parallel, where the power switch is driven by non-overlapped four-phase pulses cyclically. In two of the four negative heap converters, a part of the electric charge in parasitic...
This paper presents the dielectric barrier breakdown test in transformer oil which is between electrodes in point - point and point - plate types. Polyvinyl Chloride hard (PVC), Ply methyl meth cry late (PMMA), glass, and wood were used as solid insulator with thickness of 2.0 mm. The results of the experiment showed that, in the case of point-point electrode type, PVC can withstand the breakdown...
This paper presents a linear chrominance gain slope equalizer for correcting the linear chrominance gain distortion in the color TV transmission system. The proposed gain slope equalizer was based on Bernstein polynomials. As it is known that the Bernstein filter is best for linear phase characteristic. In addition, the modulated 20T sine-squared pulse test signal is utilized for testing the performance...
This paper presents an E-shaped flat dipole on an U-shaped cross-sectional ground plane. Dipole contributes from copper on the surface of FR4 to form the E-shaped. It is fed by a 50 Ohms coaxial cable. The frequency ranges is 1.5 – 2.8 GHz with return loss <−15 dB. The antenna provides an average gain of 7.0 dBi and HPBW of 96 degree in the horizon plan and 62 degree in the vertical plan. The front-to-back...
This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the |S11| are −14.7 dB and −23.2 dB, respectively. The radiation pattern of the proposed...
This paper discusses the enhancement using blob analysis applied to automatic segmentation of “GrabCut” tool [1] for segmenting blooming flowers in color images. The automatic segmentation of “GrabCut” is used to initialize the segmentation, but the results are not effective and there is insufficient separation of foreground and background color distributions. In our proposed work, the segmented “GrabCut”...
This paper presented a concept of inspection for maintenance of overhead power transmission lines. This concept is based on the document design as checking list which can be used by patrolmen or line inspectors. Health index is therefore calculated from the score obtained from the checking sheet. This checking sheet is filled by line inspectors according to physical conditions, aging or depreciation...
Normally power supplies provide a constant output voltage. A DC-DC converter in most of the applications is controlled by a voltage mode or a current mode controller. The DC converters are employed to feed electric vehicles, telephone sets and civil invertors, or for induction motors and frequency control. In this regard, optimal exploitation of DC transformed by classical controllers has been a controversial...
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