Electronics Letters

Issue 24 • November 25 2010

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Displaying Results 1 - 25 of 40
  • In brief

    Publication Year: 2010, Page(s): 1578
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (137 KB)

    First Page of the Article
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  • Interview

    Publication Year: 2010, Page(s): 1578
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (96 KB)

    Radiofrequency integrated circuit (RFIC) designer, Dr Xiaopeng Yu from Zhejiang University in China, talks about the research behind the Letter '0.8 mW 1.1–5.6 GHz dual-modulus prescaler based on multiphase quasi-differential locking divider' on page 1595. View full abstract»

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  • Sensing change

    Publication Year: 2010, Page(s): 1579
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    A compact one-fibre solution for temperature compensated refractive index measurement has been demonstrated. The first femtosecond laser-fabricated refractive index sensor without material removal that compensates for changes in temperature has been demonstrated by the researchers. The researchers devised a fibre Mach-Zehnder interferometer structure with a femtosecond laser irradiated spot and a ... View full abstract»

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  • VCSELs take control

    Publication Year: 2010, Page(s): 1580
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    A vertical-cavity surface-emitting laser (VCSEL) that is capable of controlled switching between different polarisation states has been demonstrated by researchers at the University of California Santa Barbara (UCSB). The US-based team showed that, by changing the direction of the current injection in a specially designed dual intra-cavity contacted VCSEL, the output polarisation can be switched b... View full abstract»

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  • Wideband E-shaped dipole antenna with staircase-shaped feeding strip

    Publication Year: 2010, Page(s):1583 - 1584
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (219 KB)

    A wideband E-shaped dipole antenna with a staircase-shaped feeding strip is presented. The antenna has wide impedance bandwidth (SWR<; 1.5) of 60%, which is ranged from 1.84 to 3.44 GHz. Stable unidirectional radiation patterns, low cross-polarisation level and high average gain are achieved over the passband. View full abstract»

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  • Broadband leaky-wave antenna based on composite right/left handed substrate integrated waveguide

    Publication Year: 2010, Page(s):1584 - 1585
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (257 KB)

    A periodically loaded broadband leaky-wave antenna with a wide beam-scanning feature based on the composite right/left handed substrate integrated waveguide is proposed. The reported antenna presents expected broadband impedance matching with return loss of S11 <;; 10 dB from 11.7 to 17.7 GHz (41%). The measured radiation pattern exhibits continuous frequency-scanning from backward d... View full abstract»

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  • Directly fed millimetre-wave two-arm spiral antenna

    Publication Year: 2010, Page(s):1585 - 1587
    Cited by:  Papers (2)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    An 18 to 110 GHz two-arm Archimedean spiral antenna directly fed with a Dyson balun is designed, fabricated, and measured. The feed line includes a monolithically integrated rectangular coaxial line impedance transformer designed to reduce the nominal antenna impedance from ~180 to 80 Ω and to match that impedance to the nominal system's impedance of 50 Ω. Full-wave modelling and imp... View full abstract»

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  • Enhanced bandwidth of low-profile sleeve monopole antenna for indoor base station application

    Publication Year: 2010, Page(s):1587 - 1588
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (441 KB)

    The design and enhanced bandwidth performance of a monopole antenna with a simple sleeve structure for indoor base station application is presented. Besides a top-loading circular patch shorted to the ground plane through four shorting probes for a low profile, the circular sleeve structure to effectively improve the matching condition of the upper operating frequency edge can be used for bandwidt... View full abstract»

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  • UWB pyramidal monopole antenna with wide tunable band-notched behaviour

    Publication Year: 2010, Page(s):1588 - 1590
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (350 KB)

    An ultra-wideband (UWB) antenna with well controlled omnidirectional patterns and a band notch is presented. The antenna consists of a pyramidal monopole with slots in each face, the resonant frequency of which can be controlled using a variable capacitor. Performance is demonstrated with fixed capacitors, showing tuning over a very wide frequency range of 4.8 to 7.472 GHz and low pattern ripple i... View full abstract»

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  • Simulations and experiments on higher resonant modes of cubic high dielectric resonator metamaterial

    Publication Year: 2010, Page(s):1590 - 1591
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (279 KB)

    The metamaterial structure composed of cubic high dielectric resonators periodically arrayed in a low dielectric substrate is analysed and a flat metamaterial lens is used to improve the gain of a rectangular patch antenna. A dielectric slab is also discussed and compared with the metamaterial lens. Experimental results show that the proposed metamaterial flat lens can improve the gain of a patch ... View full abstract»

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  • UHF near-field RFID reader antenna with capacitive couplers

    Publication Year: 2010, Page(s):1591 - 1592
    Cited by:  Papers (31)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    A segmented loop antenna with capacitive couplers is proposed for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications, which is capable of generating a strong and uniform magnetic field in a near-field zone even though the perimeter of the loop is comparable to the operating wavelength. As an example, an antenna printed onto an FR4 printed circuit board with an... View full abstract»

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  • UWB antenna with dual narrow band notches for lower and upper WLAN bands

    Publication Year: 2010, Page(s):1593 - 1594
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (201 KB)

    A simple and compact ultra-wideband (UWB) printed planar monopole antenna with dual narrow band-notched characteristics is proposed. The band notches are realised by employing a U-slot defected ground structure in the ground plane on the back side and etching a split ring slot in the radiation patch on the front side, and dual narrow rejected filtering properties in the lower WLAN band and upper W... View full abstract»

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  • Simple confocal thickness gauge based on fibre-optic confocal sensor for non-contact measurement

    Publication Year: 2010, Page(s):1594 - 1595
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    A simple non-contact thickness measurement method based on a dual-confocal microscope has been developed and tested. A reference comparison method was adapted for calibration of the system. The high accuracy potential of the method was demonstrated by measuring the thickness of transparent samples and a non-transparent soft biological sample. Lensed-tip fibre-optic confocal sensors were tested for... View full abstract»

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  • 0.8 mW 1.1–5.6 GHz dual-modulus prescaler based on multi-phase quasi-differential locking divider

    Publication Year: 2010, Page(s):1595 - 1597
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (177 KB)

    A dual-modulus prescaler based on a multi-phase quasi-differential locking divider is presented. It directly modulates the output in a multi-phase ring oscillator by quasi-differential injection. Dualmodulus operation is achieved by change of the number of injected signals. It is suitable for low supply operation while a wide locking range is obtained. Implemented in a standard 0.18 μm CMOS... View full abstract»

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  • Highly-linear CMOS cross-coupled compensator transconductor with enhanced tunability

    Publication Year: 2010, Page(s):1597 - 1598
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (262 KB)

    Proposed is the design of a CMOS highly-linear differential cross-coupled compensator transconductor that combines both cross-quad and cascomp linearisation techniques with enhanced tunability. The proposed cross-coupled compensator linearises the total drain current while maintaining a high input voltage swing range. It achieves a wide tunable gm" nulling over 500 mV differential input signal and... View full abstract»

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  • Conditions for static pre-compensation

    Publication Year: 2010, Page(s):1598 - 1600
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (84 KB)

    Static pre-compensators are used in industrial applications to reduce interactions of a multivariable system to facilitate implementation of decentralised single-loop control systems. Whilst a wide range of techniques exist for the design of static pre-compensators, not all types of system interactions will yield to a static design. Outlined is a simple test which constitutes a necessary condition... View full abstract»

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  • Mixed ranking scheme for video retrieval

    Publication Year: 2010, Page(s):1600 - 1601
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (56 KB)

    A unified ranking scheme for effective video retrieval is proposed, in which low-level visual feature terms and high-level image category features are combined organically to inspire effective retrieval in the manner of semantics. By taking these features as a joint fact of document relevance, the BM25 model, popular in text retrieval, is employed to determine a mixed similarity rank of video docu... View full abstract»

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  • Hyperspectral image compression based on 3D reversible integer lapped transform

    Publication Year: 2010, Page(s):1601 - 1602
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (76 KB)

    Transform coding proves to be efficient and practical for image compression. A three-dimensional reversible integer lapped transform (3D-RLT) is presented. Moreover, based on 3D-RLT, a progressive lossy-to-lossless compression algorithm is proposed for hyperspectral images. Experimental results demonstrate that the 3D-RLT performs better than a 3D 9/7 wavelet transform (3D-9/7WT) at most bit rates... View full abstract»

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  • Log-log scaled Harris corner detector

    Publication Year: 2010, Page(s):1602 - 1604
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (175 KB)

    The well-known Harris algorithm for corner detection in digital images suffers from poor localisation especially in high (≥3) order corners. In this reported work, the Harris algorithm is extended to have better localisation performance by applying the log-log scale to gradient vectors of image pixels. View full abstract»

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  • Robust scaling iterative closest point algorithm with bidirectional distance measurement

    Publication Year: 2010, Page(s):1604 - 1605
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1115 KB)

    Proposed is a robust algorithm for scaling registration of point sets, in the way of introducing the bidirectional distance measurement into the least square problem, which is solved in the way the iterative closest point algorithm does by iterations. At each iterative step of this algorithm, bidirectional correspondence is set up between two m-dimensional point sets, and then a simple and ... View full abstract»

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  • Variable regularisation parameter sign subband adaptive filter

    Publication Year: 2010, Page(s):1605 - 1607
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (226 KB)

    A sign subband adaptive filter (SSAF) for acoustic echo cancellation is proposed, which is derived by minimising the L1-norm of the subband a posteriori error vector subject to a constraint on the tap-weight vector of the filter. In addition, a variable regularisation parameter (VRP) is introduced to improve the performance of the SSAF. Simulation results are presented to verify the goo... View full abstract»

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  • Differential radial power combiner using substrate integrated waveguide

    Publication Year: 2010, Page(s):1607 - 1608
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    A novel substrate integrated waveguide (SIW) differential radial power combiner design is presented based on changing the electric field polarity of selected probes, which greatly simplifies the design and modelling. The 180° out-of-phase characteristic between the selected two output ports is frequency independent, which is suitable for various broadband applications. To verify the differe... View full abstract»

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  • Microwave photonic filters with programmable bipolar coefficients based on π-phase inversion of DSB sidebands

    Publication Year: 2010, Page(s):1609 - 1610
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    A new technique to realise dynamic negative coefficients for microwave photonic signal processors is presented. It is based on π-phase inversion of two sidebands in double-sideband (DSB) modulation, through spectral-line phase manipulation. The all-optical technique has advantages of enabling scaling to multiple-taps, and is highly versatile because it is programmable and enables dynamic re... View full abstract»

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  • Millimetre-wave broadband transition of substrate-integrated waveguide to rectangular waveguide

    Publication Year: 2010, Page(s):1610 - 1611
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (197 KB)

    Proposed is a new substrate-integrated waveguide to air-filled rectangular waveguide (WR-10) transition for use at millimetre-wave frequencies. The transition combines the features of low return loss and low insertion loss over the 42 GHz bandwidth and it can be manufactured without a high degree of complexity. A 75-115 GHz band prototype of the proposed broadband transition is designed and fabric... View full abstract»

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  • Wideband planar balun using microstrip to CPW and microstrip to CPS transitions

    Publication Year: 2010, Page(s):1611 - 1613
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (295 KB)

    A wideband planar balun is proposed using microstrip to coplanar waveguide (CPW) and microstrip to coplanar stripline (CPS) transitions. This structure shows broadband characteristics and does not rely on resonant circuits. Moreover, it does not require tight coupling sections and can be easily fabricated on a printed circuit board substrate. Out-of-phase characteristic between two output ports is... 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