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Electronics Letters

Issue 14 • Date July 5 2012

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Displaying Results 1 - 25 of 53
  • In brief

    Publication Year: 2012, Page(s): 804
    IEEE is not the copyright holder of this material | PDF file iconPDF (100 KB)
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  • Interview

    Publication Year: 2012, Page(s): 804
    IEEE is not the copyright holder of this material | PDF file iconPDF (81 KB)
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  • A clean sweep for MEMS-VCSELs

    Publication Year: 2012, Page(s): 805
    IEEE is not the copyright holder of this material | PDF file iconPDF (253 KB)
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  • Amplifying graphene

    Publication Year: 2012, Page(s): 806
    IEEE is not the copyright holder of this material | PDF file iconPDF (297 KB)
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  • Dual-band quasi-Yagi antenna with split ring resonator directors

    Publication Year: 2012, Page(s):809 - 810
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (255 KB)

    Presented is a novel dual-band quasi-Yagi antenna with split ring resonator directors. The uniqueness of this design is based on its simple new director structure while yielding useful directivity and more importantly dual-band characteristics. These features are related to the two operating modes of the split ring resonator director. The unusual miniaturisation technique used for the proposed Yag... View full abstract»

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  • Compact CPW-fed antenna with two asymmetric U-shaped strips for UWB communications

    Publication Year: 2012, Page(s):810 - 812
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (431 KB)

    A novel coplanar waveguide (CPW)-fed printed antenna with two asymmetric U-shaped strips is designed and analysed for ultra-wideband wireless applications. The asymmetric radiating structure with two U-shaped strips and a staircase-shaped strip is adopted in the proposed antenna which broadens the bandwidth to a great extent. The dimensions of the antenna are only 23 × 25.5 × 1.6 &#x... View full abstract»

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  • Electrically small tunable antennas using split ring resonators

    Publication Year: 2012, Page(s):812 - 813
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    Presented are tunable electrically small antennas composed of split ring resonators (SRRs), which are used to reduce antenna size. To control the resonance frequency, a lumped inductor is inserted between the SRRs and the ground. The proposed antenna operates within Korean personal communication services (PCS) frequency bands of 1750-1870-MHz, and the size of the antenna is 1-33-0 ... View full abstract»

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  • Low-profile folded-monopole antenna with unbalanced composite right-/left-handed transmission line

    Publication Year: 2012, Page(s):813 - 815
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    A low-profile folded-monopole antenna with high radiation efficiency is presented, consisting of only two unbalanced composite right-/left-handed transmission line unit cells. An even-odd mode analysis shows that the even mode necessary to realise the folded-monopole effect prevails at the zeroth-order frequency, determined by the shunt resonance of the unbalanced unit cell. Loading a spiral induc... View full abstract»

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  • On the radio frequency system of ground plane booster antenna technology

    Publication Year: 2012, Page(s):815 - 817
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (466 KB)

    Recent trends in handset antenna design are oriented to maximise the contribution of the ground plane to the radiation process. The challenge of these techniques mainly relies on the complexity of the radiofrequency system (combination of inductors, capacitors, and transmission lines) required to satisfy bandwidth and efficiency specifications. With the aim of simplifying the said radiofrequency s... View full abstract»

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  • Ultra-wideband planar inverted-F antennas with cut-etched ground plane

    Publication Year: 2012, Page(s):817 - 818
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    Improved bandwidth property of the planar inverted-F antenna (PIFA) is presented by using a cut-etcheded ground plane. A demonstration PIFA exhibits more than 100% bandwidth with resonance covering all wireless local area network frequencies and 2-6 GHz mobile broadband wireless access applications. It is shown that such an ultra-wideband PIFA will achieve nearly omnidirectional radiation pattern ... View full abstract»

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  • Wideband circularly polarised antenna on slot-loaded ground plane

    Publication Year: 2012, Page(s):818 - 819
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (666 KB)

    A wideband circularly polarised antenna is presented. It features an inverted L-shaped monopole, an inverted U-shaped strip and a slot-loaded ground plane. The ground plane and U-shaped strip share the same layer, and the L-shaped strip is printed in the opposite layer. The U-shaped strip is useful in increasing the return-loss bandwidth, and the slot on the ground is found crucial to widen the ax... View full abstract»

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  • Hybrid scheme for low-power set associative caches

    Publication Year: 2012, Page(s):819 - 821
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (243 KB)

    Proposed is a dual-mode-access cache to reduce power consumption in set associative caches for embedded systems. The proposed scheme introduces a pre-cache buffer to determine how to access the cache. This is a buffered dual-mode cache scheme. The proposed cache shows better prediction rates and lower power consumption than conventional caches, such as the phased cache or the way-prediction cache.... View full abstract»

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  • Low-power offset-cancellation switched-capacitor correlated double sampling bandgap reference

    Publication Year: 2012, Page(s):821 - 822
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    A low-power offset-cancellation switched capacitor bandgap reference for a tyre pressure monitor system is proposed. It employs a correlated double sampling switched-capacitor amplifier with opamp offset voltage cancellation without requiring the output to slew to ground each time the amplifier is reset. Additionally the circuit topology is very insensitive to low opamp gain and allows a simple si... View full abstract»

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  • High-performance micropower class AB current mirror

    Publication Year: 2012, Page(s):823 - 824
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (146 KB)

    A novel high-performance low-power CMOS class AB current mirror is presented. The circuit combines very high linearity, very low input and high output resistance, high current handling capability and low standby power consumption. Measurement results show a THD <; -85 dB for input current amplitudes five times larger than the bias current. View full abstract»

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  • Memristive diode bridge with LCR filter

    Publication Year: 2012, Page(s):824 - 825
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (162 KB)

    The class of nonlinear dynamical systems known as memristive systems was defined by Chua and Kang back in 1976. Since then, many studies have addressed the search for physically-realisable memristive systems. In this reported work, it is proved that the class of memristive systems encloses an elementary electronic circuit comprising a full-wave rectifier with a second-order RLC filter. View full abstract»

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  • Background subtraction using semantic-based hierarchical GMM

    Publication Year: 2012, Page(s):825 - 827
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (261 KB)

    Background including a long-period fast illumination variation is commonly assumed to be foreground by mistake. To solve this problem, proposed is a semantic-based hierarchical Gaussian mixture model integrated with an illumination detection approach. First, autocorrelation-based features for broad identification of background lighting changes and foreground in short-term sequences are presented. ... View full abstract»

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  • Context-adaptive anisotropic diffusion for image denoising

    Publication Year: 2012, Page(s):827 - 829
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (270 KB)

    To mitigate smoothing of image features in anisotropic diffusion filtering, a novel scheme called context-adaptive anisotropic diffusion is proposed for image denoising via a weighted diffusivity function, which encodes the impact of contextual discontinuities and can adaptively control the smoothing speed for improving the capability of feature preservation along with noise removal. Experimental ... View full abstract»

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  • Intensity correction method based on maximum likelihood estimation

    Publication Year: 2012, Page(s):829 - 831
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    A method for image correction is proposed under illumination change. The intensity changes can be modelled as an additive factor and a multiplicative factor relating current image to reference image. The parameters are estimated based on maximum likelihood estimation. For motion compensation, the process of outlier detection is performed. The experimental results demonstrate that the proposed meth... View full abstract»

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  • Robust complete occlusion handling in adaptive template matching target tracking

    Publication Year: 2012, Page(s):831 - 832
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (455 KB)

    Occlusion is a common problem in visual tracking applications. In adaptive template matching target tracking, characteristics of the occluding object may be erroneously incorporated in the new updated template. Such a corrupted template affects the tracker robustness and may lead to target loss. A novel technique is proposed for complete occlusion handling, in the context of a SWAD-based adaptive ... View full abstract»

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  • Sparsity-based inverse halftoning

    Publication Year: 2012, Page(s):832 - 834
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (418 KB)

    Proposed is the sparsity-based inverse halftoning method, in which a sparse prior that reflects the natural gradient statistics is used with the sparse representation of the lowpass-filtered halftoned patches paired with the corresponding continuous patches to solve a regularised deconvolution. The experimental results show that the proposed method that was based on the sparsity, i.e. the combinat... View full abstract»

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  • Transformation invariant algorithm for automatic fingerprint recognition

    Publication Year: 2012, Page(s):834 - 835
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (230 KB)

    Presented is a novel algorithm for fingerprint template formation and matching in automatic recognition. The algorithm does not rely on any core, singularity point or minutiae orientations, on which most established algorithms are based for template formation. Therefore, the algorithm has made the template structure invariant to global rotation and translation. The template structure is based on t... View full abstract»

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  • Visual lock-on to invisible target for unmanned aerial vehicle

    Publication Year: 2012, Page(s):835 - 837
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (768 KB)

    Presented is a robust visual lock-on framework for an unmanned aerial vehicle (UAV) that utilises geometric relations between the UAV pose and the 3D local map defined by the positions of the target and natural landmarks. Experimental results using real datasets demonstrate the robustness of the proposed method compared to state-of-the-art visual tracking methods. View full abstract»

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  • Non-data-aided SNR estimation method for APSK exploiting rank discrimination test

    Publication Year: 2012, Page(s):837 - 839
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    Presented is a non-data-aided (NDA) signal-to-noise ratio (SNR) estimation method for amplitude-phase shift-keying (APSK) in the presence of additive white Gaussian noise over a quasi-static channel. The proposed estimator is based on a rank discrimination test and uses a look-up table for SNR estimation. The performance of the proposed estimator is evaluated for 8APSK and 16APSK. It is shown thro... View full abstract»

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  • Approximate distributed clustering by learning the confidence radius on Fisher discriminant ratio

    Publication Year: 2012, Page(s):839 - 841
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    Presented is a new clustering algorithm with approximate distributed clustering over a peer-to-peer (P2P) network. The Fisher discriminant ratio is used to dynamically learn the confidence radius based on the data distribution in every local peer. Experimental results show that the proposed approach can achieve better clustering accuracies than the DFEKM algorithm while preserving much lower bandw... View full abstract»

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  • Assessment of crawling of an induction motor by stator current Concordia analysis

    Publication Year: 2012, Page(s):841 - 842
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (241 KB)

    Proposed is a method of diagnosis of crawling of an induction motor by stator current Concordia analysis. It has been done by assessing generated harmonics using stator current Concordia. Stator current of an induction motor has been captured, normalised and then Concordia has been formed in the Park plane. The presence of different harmonics has been assessed by a rule set based on the features e... 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