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Electronics Letters

Issue 5 • Date February 28 2013

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Displaying Results 1 - 25 of 41
  • In brief

    Publication Year: 2013, Page(s): 310
    IEEE is not the copyright holder of this material | PDF file iconPDF (80 KB)
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  • Interview

    Publication Year: 2013, Page(s): 310
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (91 KB)

    Dr. Oscar Gustafsson from Linkoping University in Sweden talks about the research behind his paper 'Unified architecture for 2, 3, 4, 5, and 7-point DFTs based on the Winograd Fourier transform algorithm' on page 348. View full abstract»

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  • Phase space

    Publication Year: 2013, Page(s): 311
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (255 KB)

    Researchers at the University of Cantabria in Spain have designed and fabricated a phase switch for use in radio astronomy and other microwave measurement systems. Using existing techniques and an unconventional application of bandpass filters the group have created a phase switch that can be integrated into a microwave receiver, optimise imbalances between branches and reduce noise. View full abstract»

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  • Aiming for the sky

    Publication Year: 2013, Page(s): 312
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (273 KB)

    Research from France presents a compact, single-source subwavelength metamaterial directive Fabry-Pérot cavity antenna with 56° of beam steering aimed at aerospace applications. View full abstract»

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  • Metamaterial-based frequency reconfigurable antenna

    Publication Year: 2013, Page(s):315 - 316
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    A frequency reconfigurable antenna based on metamaterial is presented. It is composed of a coplanar-fed straight-line monopole with two double split-ring resonators (DSRRs) of different size disposed at its proximity. Each cell exhibits a negative permeability over a frequency band, which produces magnetic couplings with the monopole that starts to radiate at new bands; the whole structure is now ... View full abstract»

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  • Broadband beam scanning circularly-polarised leaky-wave antenna based on modified substrate integrated waveguide

    Publication Year: 2013, Page(s):316 - 318
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (482 KB)

    A high gain broadband beam scanning circularly-polarised (CP) leakywave antenna (LWA) is proposed based on a modified substrate integrated waveguide. The designed CP LWA has been fabricated and its performance measured. The reported antenna presents expected broadband matched impedance with a measured reflection coefficient |S11| <;- 10 dB from 15.4 to 19 GHz. The radiation pattern w... View full abstract»

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  • Fast measurement of antenna pattern overlap matrix in reverberation chamber

    Publication Year: 2013, Page(s):318 - 319
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (215 KB)

    Presented is a fast way for the measurement of the pattern overlap matrix in an arbitrary multi-port antenna system by a reverberation chamber. This parameter is central for calculation of the spatial correlation between different elements with arbitrary terminations. To the authors' knowledge, this is the fastest method for the measurement of the pattern overlap matrix in a lossy structure. View full abstract»

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  • Inductive-varying grid for highly beamsteerable cavity antennas

    Publication Year: 2013, Page(s):319 - 321
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (369 KB)

    The design of a locally one-dimensional inductive-varying metamaterial operating near 10 GHz is reported. This is combined with a fixed capacitive grid to design a phase-varying metasurface. This composite metasurface is then used as a partially reflecting surface (PRS) together with a perfect electric conductor surface to form a resonant Fabry-Pérot type cavity. A patch antenna acting as ... View full abstract»

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  • Wideband and non-dispersive wavelet transmission using leaky lens antenna

    Publication Year: 2013, Page(s):321 - 322
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (405 KB)

    An ultra-wideband, non-dispersive leaky lens antenna system for impulse applications has been designed, fabricated and characterised. An in-house wavelet generator is connected to the antenna to transmit 100 ps-long square pulses with centre frequencies at 45, 60 and 75 GHz. It is shown that the leaky lens antenna has negligible distortion and preserves the pulse shape generated by the millimetre-... View full abstract»

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  • Innovative design of implanted medical lead to reduce MRI-induced scattered electric fields

    Publication Year: 2013, Page(s):323 - 324
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (213 KB)

    The radio frequency coils in magnetic resonance imaging (MRI) systems induce scattered electric fields in the implanted medical lead and result in tissue heating. A novel structure of the medical lead has been designed to reduce the scattered field. Proposed metal nails are placed along the medical lead. The scattered electric field is calculated near the medical lead tip at 64 MHz (1.5 T MRI). By... View full abstract»

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  • Noise reduction in magnetic resonance images using adaptive non-local means filtering

    Publication Year: 2013, Page(s):324 - 326
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    Proposed is a noise reduction method for magnetic resonance (MR) images. This method can be considered a new adaptive non-local means filtering technique since different weights based on the edgeness of an image are applied. Unlike conventional noise reduction methods, which typically fail in preserving detailed information, the proposed method preserves fine structures while significantly reducin... View full abstract»

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  • 2-4 GHz wideband power amplifier with ultra-flat gain and high PAE

    Publication Year: 2013, Page(s):326 - 327
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (401 KB)

    Demonstrated is a 2-4 GHz wideband power amplifier (WPA) using Cree 10 W GaN HEMT CGH40010. Also a novel process to find the optimum impedances is presented, with which the gain flatness can be taken into account. A compact PCB has been fabricated and tested with continuous waves at low (20 dBm) and high (28 dBm) input power level. From the measured results, at low power level, the gain is 13.1-14... View full abstract»

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  • VCM-based monotonic capacitor switching scheme for SAR ADC

    Publication Year: 2013, Page(s):327 - 329
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    A novel energy-efficient VCM-based monotonic capacitor switching scheme for successive approximation register (SAR) analogue to-digital converters (ADCs) is proposed. Based on the third reference voltage VCM and monotonic capacitor switching procedure, the proposed switching scheme achieves 97.66% less switching energy and 75% less number of capacitors over the conventional a... View full abstract»

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  • Ternary R2R DAC design for improved energy efficiency

    Publication Year: 2013, Page(s):329 - 330
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    An R2R DAC using three digital input levels rather than two is proposed as well as a modified two-level structure that emulates the three-level DAC's benefits. This three-level structure provides power reductions of 79% and linearity improvements due to matching of a factor of 2 over the two-level case. Ideal implementation is also described in terms of the logic needed to code the DAC and the req... View full abstract»

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  • Energy-efficient charge-recovery switching scheme for dual-capacitive arrays SAR ADC

    Publication Year: 2013, Page(s):330 - 332
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (223 KB)

    Proposed is an energy-efficient charge-recovery switching scheme for a dual-capacitive arrays successive approximation register (DCA-SAR) analogue-to-digital converter (ADC). With the use of the charge-recovery technique in a fully differential DCA-SAR architecture, the proposed switching scheme achieves 98.7 and 46.9% reduction in switching energy and area, respectively, while maintaining the swi... View full abstract»

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  • FPGA realisation of inverse kinematics for biped robot based on CORDIC

    Publication Year: 2013, Page(s):332 - 334
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (533 KB)

    A FPGA realisation structure based on CORDIC is proposed to implement inverse kinematics for a biped robot. First, the angle equations of inverse kinematics for the biped robot are described. Based on these equations represented by the inverse tangent function, a FPGA structure based on two CORDIC operators of circular vectoring and hyperbolic vectoring is proposed and implemented on a FPGA chip. ... View full abstract»

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  • Generalised Pareto distribution for extreme value modelling in electromagnetic compatibility

    Publication Year: 2013, Page(s):334 - 335
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (309 KB)

    Statistical studies involved in risk management mainly focus on general tendencies which are considered as sufficient for non-critical applications. This implies laying aside extreme events which may nonetheless be crucial to the security of critical facilities. In light of this observation, it is proposed here to follow the opposite approach and to focus on the extreme values statistics. In parti... View full abstract»

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  • Fundamental relationship between bilateral Kernel and locally adaptive regression Kernel

    Publication Year: 2013, Page(s):335 - 337
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (59 KB)

    The relationship between the bilateral kernel function and the recently proposed locally adaptive regression kernel is examined. Despite the difference in implementation, both locally adaptive approaches are designed to prevent averaging across edges while smoothing an image. Their similarity suggests that they can reasonably be linked although both filtering approaches have grown to become well-e... View full abstract»

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  • Object tracking using random sparse appearance model

    Publication Year: 2013, Page(s):337 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (283 KB)

    Selection of reliable templates is important for robust tracking. To this end a novel appearance model is proposed. This model consists of several representive templates. Each template, whose feature vector is extracted from a group of randomly selected feature points on the object, represents a different view of the object. By means of a sparse representation method, the appearance model is updat... View full abstract»

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  • Optical road-ice detector operating in the near infrared

    Publication Year: 2013, Page(s):338 - 340
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (361 KB)

    Introduced is an optical approach for the assessment of the road conditions due to various atmospheric perturbations, such as the presence of ice and rain. The technique is based on measuring the polarisation contrast in reflection, in conjunction with the intensity of the diffused light, in the near infrared. View full abstract»

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  • Real-time swimmers' feedback based on smart infrared (SSIR) optical wireless sensor

    Publication Year: 2013, Page(s):340 - 341
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (253 KB)

    An IrDA link based on a serial infrared transceiver has been designed and implemented for real-time swimmers' feedback. A wrist-mounted accelerometer provided stroke information to the transmitter. The signal was detected using a photodiode detector. Both the transmitter and receiver units measured 27 ' 19 mm. Propagation experiments in air and under water were performed in a glass tank (91 ' 39 '... View full abstract»

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  • Spatiotemporal 3D motion vector filtering method for robust visual odometry

    Publication Year: 2013, Page(s):341 - 343
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (393 KB)

    Most of the previous visual odometry methods cannot deal with a large independently moving object that takes up over 50% of the image area. To overcome this problem, the spatiotemporal filter is incorporated into the RANSAC method to filter out false match that occurrs by a large independently moving object. This spatiotemporal filter uses the current and previous motion vector%s length and direct... View full abstract»

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  • Iterative Wiener filter

    Publication Year: 2013, Page(s):343 - 344
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    A new adaptive filter algorithm, the iterative Wiener filter (IWF), is proposed to overcome the drawback of slow convergence speed for most LMS-type algorithms. The adaptive filter is posed as a problem of finding the solution of a linear matrix equation, equivalent to the Wiener equation. Then the step size is optimised, which is time variant in terms of the residual error in each step. This prop... View full abstract»

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  • Performance analysis for mobile-relay-based M2M two-way AF relaying in N*Nakagami-m fading

    Publication Year: 2013, Page(s):344 - 346
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (163 KB)

    The system outage probability of a mobile-relay-based two-way amplify-and-forward (AF) relaying system is investigated. Independently but not necessarily identically distributed N*Nakagami-m fading is adopted to provide a realistic description of the mobile-to-mobile (M2M) channel. By slightly adjusting the integral region, concise and generalised closed-form lower and upper bounds are obtained, p... View full abstract»

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  • Polar codes for distributed source coding

    Publication Year: 2013, Page(s):346 - 348
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (138 KB)

    A polar coding method to construct a distributed source coding scheme which can achieve any point on the dominant face of the Slepian-Wolf rate region for sources with uniform marginals is proposed. Source encoding and decoding operations are performed using efficient algorithms which makes practical implementation feasible. Simulation results are given to exhibit the performance of the pre... 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