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Electronics Letters

Issue 25 • Date December 6 2012

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Displaying Results 1 - 25 of 39
  • In Brief

    Publication Year: 2012, Page(s): 1572
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (84 KB)

    Includes: simplified confinement - page 1616; waffle clamp - page 1629; smart power - page 1632; mind reader - page 1583; multiple memories - page 1610 View full abstract»

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  • Interview

    Publication Year: 2012, Page(s): 1572
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

    Dr. Oscar Lucia and Hector Sarnago talk about the research behind their Letter 'Optimal Gate Drive Circuit Design for the ZVS operation of SiC JFET devices' on page 1621. View full abstract»

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  • High-G manoeuvres

    Publication Year: 2012, Page(s): 1573
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (246 KB)

    Researchers from Seoul National University and Chonbuk National University have developed a MEMS acceleration switch with a triggering threshold that can be raised electronically on demand. View full abstract»

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  • Quiet chaos

    Publication Year: 2012, Page(s): 1574
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (383 KB)

    Researchers in France have investigated the performance of high-permittivity (high-k) 28 nm CMOS devices in comparison with the standard 45 nm technology. They have shown that power output is increased in the smaller device, even for lower bias voltages. Reducing the gate length of these devices will have the effect of increasing the leakage current. This is due to the fact that a smaller structur... View full abstract»

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  • Presence detection using wideband audio-ultrasound sensor

    Publication Year: 2012, Page(s):1577 - 1578
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (205 KB)

    A presence detection scheme is proposed for determining occupancy in indoor spaces using a wideband audio-ultrasound sensor. The scheme involves ultrasonic detection by processing the echoes due to transmission of a pulsed sinusoidal waveform, in combination with audio event detection at lower frequencies. The resulting binary detection results are then fused using an OR rule. The proposed scheme ... View full abstract»

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  • Dual-band leaky wave antenna design for 5 GHz WLAN using bandgap structure

    Publication Year: 2012, Page(s):1578 - 1580
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (381 KB)

    Proposed is a novel way of inserting a propagation stop frequency band for dual-band operation of a leaky wave antenna (LWA). To make the LWA resonate at two frequencies, the stopband is introduced into an existing passband, which induces two specific conditions giving maximum radiation towards a boresight direction at the resonant frequencies locating on both sides of the stopband edge. All exper... View full abstract»

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  • Dual-band wide-beam crossed asymmetric dipole antenna for GPS applications

    Publication Year: 2012, Page(s):1580 - 1581
    Cited by:  Papers (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    A dual-band, wide-beam, circularly-polarised crossed asymmetric dipole antenna is presented for global positioning system (GPS) applications. Each dipole arm has an asymmetrically barbed arrowhead and contains two different-sized printed-inductors to reduce the length of the primary radiating element and to achieve dual-band operation. At 1.575 GHz, the antenna has a gain of 7.5 dBic, a radiation ... View full abstract»

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  • Synthesis of power patterns for wideband arrays including mutual coupling

    Publication Year: 2012, Page(s):1581 - 1583
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (215 KB)

    A power pattern synthesis technique for a wideband array including mutual coupling (MC) is proposed. A frequency-dependent MC (FDMC) matrix is obtained accurately via the complex curve fitting technique. With the FDMC matrix the mutual coupling effect is included in the synthesis procedure automatically, resulting in an MC-compensated frequency-invariant power pattern. View full abstract»

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  • Active electrode design suitable for simultaneous EIT and EEG

    Publication Year: 2012, Page(s):1583 - 1584
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Presented is an active electrode design for electrical impedance tomography spectroscopy (EITS) which contains both current stimulation and sensing pathways, and also enables the simultaneous measurement of bio-potential signals (EEG/ECG). The entire circuit is manufactured on a small circular FR4 PCB with the bottom layer forming the electrode plate. A custom sealed plastic enclosure was designed... View full abstract»

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  • Analysis of electron leakage current in MOS capacitors by using anisotropic and isotropic mass approaches

    Publication Year: 2012, Page(s):1585 - 1586
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    A leakage current in a metal-oxide-semiconductor (MOS) capacitor has been calculated taking into account an in-plane-longitudinal kinetic energy coupling, which is represented by an electron phase velocity in the gate, and anisotropic and isotropic mass approaches. The leakage currents computed under these approaches were fitted to the measured data. It was found that the calculated tunnelling cur... View full abstract»

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  • Diamond MESFET performance improvement by layout optimisation

    Publication Year: 2012, Page(s):1586 - 1588
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Hydrogen terminated diamond is a promising material for metal semi-conductor field effect transistor (MESFETs) fabrication and research effort is focused on diamond quality improvement. In this reported work, the focus of attention is on device layout and structure to improve RF performances, designed on the basis of diamond physical properties, taking into account the characterisation of previous... View full abstract»

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  • Two-stage wireless capsule image compression with low complexity and high quality

    Publication Year: 2012, Page(s):1588 - 1589
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (202 KB)

    Proposed is a two-stage image compression method for wireless capsule endoscopy images to provide high compression rate and high image quality. The first stage, implemented inside the wireless capsule, contains a very low complexity integer transform followed by an optimised quantisation and Huffman encoding. The second stage is a simple post-processing for high subjective visual quality of the re... View full abstract»

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  • Spatially enhanced local binary pattern

    Publication Year: 2012, Page(s):1590 - 1591
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (128 KB)

    The local binary pattern (LBP) is one of the state-of-the-art texture descriptors for texture classification. However, the spatial distribution of the LBPs is not taken into account. Proposed is a novel texture descriptor, namely the spatially enhanced LBP, to encapsulate the spatial distribution of the LBPs with a shape context based method. Also, the shape context based method is adapted to be r... View full abstract»

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  • Unsupervised visual saliency detection via information content measuring

    Publication Year: 2012, Page(s):1591 - 1593
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (274 KB)

    Based on the philosophy that exploits image information content as the metric of visual saliency, an innovative method for unsupervised visual saliency detection is proposed. In the foundation of clustering input into semantically consistent regions, Shannon entropy and normalised pseudo-Wigner-Ville distribution are utilised for the measuring of image information content. As a consequence, an inf... View full abstract»

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  • Lower bound on MSE of sparse vector estimation in additive white Gaussian noise

    Publication Year: 2012, Page(s):1593 - 1595
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    The lower MSE bound on a sparse vector estimation from observations corrupted by additive white Gaussian noise, when the sparsity s is unknown, is investigated. The optimal support in the MSE sense is derived as a function of the noise variance and leads to an interval-wise expression of the MSE lower bound. The obtained reduction with respect to the Cramér-Rao Bound is shown to be an incr... View full abstract»

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  • Multi-objective evolutionary approach to coding-link cost trade-offs in network coding

    Publication Year: 2012, Page(s):1595 - 1596
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (96 KB)

    Presented is a multi-objective evolutionary network coding algorithm which jointly handles the coding cost and link cost while achieving the target multicast rate in network coding. To this end, a generalised multi-objective fitness function is formulated first. A modified non-dominated sorting scheme is then developed to account for the unequal importance of the two objectives. Lastly, a diversit... View full abstract»

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  • Turbo-TSWLS: enhanced two-step weighted least squares estimator for TDOA-based localisation

    Publication Year: 2012, Page(s):1597 - 1598
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (189 KB)

    The two-step weighted least squares (TSWLS) estimator is a well-known linear approach for TDOA-base localisation. It has been applied to various applications and is also widely used as a benchmark in subsequent studies. In this reported work, it is revealed that the approximation in the weighting matrix of the second-step WLS is a crucial factor to the performance of TSWLS, and the performance of ... View full abstract»

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  • 24 to 79 GHz frequency band reconfigurable LNA

    Publication Year: 2012, Page(s):1598 - 1600
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (299 KB)

    A 24 to 79 GHz frequency-band reconfigurable low-noise amplifier (LNA) is presented, realised in an emerging RF-MEMS/BiCMOS technology. The technology implements shunt capacitive RF-MEMS switches realised in the standard metallisation layers of the BiCMOS process, thus enabling direct monolithic integration into the underlying active devices. The measurements of the realised LNA show very good per... View full abstract»

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  • Dual-band dual-ring bandpass filter with large bandwidth ratio

    Publication Year: 2012, Page(s):1600 - 1602
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    A novel dual-band bandpass filter with large bandwidth ratio is proposed by using two dual-mode square ring resonators. By stretching the length of the loaded open stub of the inner ring, one of its first-order degenerate modes moves down and forms the first passband together with a pair of first-order degenerate modes of the outer ring resonator. Meanwhile, the second passband is constructed by a... View full abstract»

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  • Compact broadband quadrature hybrid coupler using planar artificial transmission line

    Publication Year: 2012, Page(s):1602 - 1603
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (498 KB)

    A novel compact size broadband quadrature hybrid coupler based on a planar artificial transmission line which can be used for WLAN application at 2.4 GHz is presented. The planar artificial transmission line is composed with both a dual transmission line and the π-model technique. The occupied size of the proposed broadband hybrid coupler is merely 47 of the size of a conventional design. T... View full abstract»

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  • Converting an equal multi-section Wilkinson power divider to an unequal one

    Publication Year: 2012, Page(s):1603 - 1605
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (273 KB)

    An approach to the design of an unequal multi-section Wilkinson power divider based on the equal one is presented. The isolation and reflection responses of the proposed unequal multi-section divider are almost equivalent to those of the equal one of reference. Two samples of unequal Wilkinson power dividers with 3-sections and 4-sections have been constructed and measured. The simulation and meas... View full abstract»

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  • On-chip X-band branch-line coupler using glass integrated passive device technology

    Publication Year: 2012, Page(s):1605 - 1606
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (466 KB)

    An on-chip X-band branch-line coupler utilising a glass integrated passive device process is proposed. With the help of slow-wave synthesised coplanar waveguides, the proposed hybrid coupler, centred at 9.2 GHz with an operational bandwidth of 17.4%, occupies only 8.5% of the size of its conventional counterpart. The design concept, synthesis approach, and experimental results are investigated and... View full abstract»

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  • Time-reversal duality of high-efficiency RF power amplifiers

    Publication Year: 2012, Page(s):1607 - 1608
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    The similarity between RF power amplifiers and rectifiers is discussed. It is shown that the same high-efficiency harmonically-terminated power amplifier can be operated in a dual rectifier mode. Nonlinear simulations with a GaN HEMT transistor model show the time-reversal intrinsic voltage and current waveform relationship between a class-F amplifier and rectifier. Measurements on a class-F-... View full abstract»

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  • Ultra-wideband 45° phase shifter based on simplified composite right/left-handed transmission line

    Publication Year: 2012, Page(s):1608 - 1610
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    An ultra-wideband 45° phase shifter based on a simplified composite right/left-handed transmission line is presented. The measured -10 dB return loss bandwidth covers the range of 2.6-7.8 GHz (100%), and the maximum insertion loss within the frequency range is 0.8 dB. The measured phase shift variation is 45° ± 2.5° within 2.9-8.9 GHz and the maximum 45° ±... View full abstract»

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  • Printed circuit board based memristor in adaptive lowpass filter

    Publication Year: 2012, Page(s):1610 - 1611
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    A new memristor based on zinc oxide (ZnO) nanowires grown on the copper layer of a printed circuit board has been fabricated showing similar characteristics as memristive metal/oxide/metal structures. This device is then used with a capacitor and an inductor to form a first-order and a second-order lowpass filter to demonstrate the adaptability of the memristor. The memristor reacts to different i... View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK