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Electronics Letters

Issue 3 • Date Feb. 4 2010

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Displaying Results 1 - 25 of 50
  • In brief

    Publication Year: 2010, Page(s): 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (40 KB)

    First Page of the Article
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  • Interview

    Publication Year: 2010, Page(s): 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (72 KB)

    "Integrated optical modulation devices open the door for optical communication being close to the Shannon limit" View full abstract»

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  • New chip off the silicon block

    Publication Year: 2010, Page(s): 187
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    A new approach to combining GaN and CMOS devices on silicon takes us a step closer to low cost high-performance system-on-one chips. The first monolithically-grown chips that combine gallium nitride and CMOS devices on a silicon substrate have been demonstrated by collaborating researchers at the National Research Council of Canada and Carleton University. The team partnered with the world expert ... View full abstract»

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  • Helping hands

    Publication Year: 2010, Page(s): 188
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    In this paper hand phantoms has been developed that will assist the mobile phone antenna system designs and to study particular grip on the mobile phone. View full abstract»

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  • Dual-feed PIFA diversity antenna for wireless applications

    Publication Year: 2010, Page(s):189 - 190
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (327 KB)

    A novel dual-feed planar inverted-F antenna (PIFA) suitable for wireless diversity/MIMO applications is presented. By exploiting the pattern diversity, successful provision of two isolated feeding ports using one common radiating plate has been achieved. The main technique introduced is to etch the ground plane under the radiating plate to reduce the mutual coupling between the two ports. It is fo... View full abstract»

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  • Broadband double-tuned element with low profile for base station antennas

    Publication Year: 2010, Page(s):191 - 192
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    A broadband element with low profile (0.1?? at 1710 MHz) for base station antennas is presented. A special loop-feed technique, which achieves a double-tuned response like a bandpass filter, is used to broaden the operation band of the antenna. The proposed antenna yields 29% bandwidth of 1710-2200 MHz with return loss less than 17 dB (VSWR<1.32). Simulated and measured results are given, showi... View full abstract»

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  • Impact of tolerances in dielectric properties of hand phantoms

    Publication Year: 2010, Page(s):193 - 194
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (174 KB)

    Hand phantoms are increasingly important in assessing the communication performance of handsets. A parametric study on tolerances of the material properties of hand phantoms is performed, showing that small variations of both relative permittivity and conductivity with respect to their nominal values hardly affect absorption and mismatch loss. View full abstract»

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  • Dual-band reconfigurable antenna for base-station applications

    Publication Year: 2010, Page(s):195 - 196
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    A novel reconfigurable antenna for dual-band operation is proposed. This antenna is composed of two square patches for lower frequency (patch 1) and upper frequency (patch 2), patch 2 being embedded in the centre cavity of patch 1. Frequency control can be realised using a switching circuit placed in the backside of the radiators without any switching components and capacitor variable components s... View full abstract»

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  • Polymeric ferrite sheets for SAR reduction of wearable antennas

    Publication Year: 2010, Page(s):197 - 198
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    Reduction of specific absorption rate (SAR) has now become a buzz word because of the growing health concerns over microwave exposure. Ferrites are found to be effective in diminishing electromagnetic influence. In this reported work, flexible polymeric ferrite sheets are characterised on the basis of their shielding efficiencies. SAR measurements are carried out with a planar wearable antenna and... View full abstract»

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  • Reconfigurable monopolar patch antenna

    Publication Year: 2010, Page(s):199 - 200
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (479 KB)

    A single probe-fed reconfigurable monopolar patch antenna with frequency diversity is presented. The proposed antenna has a rectangular patch with two shorting pins. Four open stubs are attached to the rectangular patch through four pin diodes, and the ability of switching the antenna operating frequency is achieved by using dual in-line package switches to control the states of the diodes,... View full abstract»

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  • Simultaneous control of sidelobe level and harmonic beam steering in time-modulated linear arrays

    Publication Year: 2010, Page(s):201 - 202
    Cited by:  Papers (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    A new approach to achieving simultaneous beam steering and low sidelobe levels in time-modulated linear arrays is presented. The technique relies solely on time-switching of the array elements and does not require the use of additional amplitude weighting. Numerical examples are presented for a 16-element linear array. View full abstract»

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  • DNA sequences generated by BCH codes over GF(4)

    Publication Year: 2010, Page(s):203 - 204
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (668 KB)

    The question raised by researchers in the field of mathematical biology regarding the existence of error-correcting codes in the structure of the DNA sequences is answered positively. It is shown, for the first time, that DNA sequences such as proteins, targeting sequences and internal sequences are identified as codewords of BCH codes over Galois fields. View full abstract»

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  • Digitised spread spectrum clock generator using direct variable current modulation

    Publication Year: 2010, Page(s):205 - 206
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (297 KB)

    A fully-integrated digitised spread spectrum clock generator (D-SSCG) using direct variable current modulation is presented. The proposed D-SSCG realises the spread spectrum function by only adding some micro-current source branches into a conventional clock generator. It has been fabricated in a 0.5 ??m BCD process and applied to a fly-back converter, among which the D-SSCG consumes 1.68 mW and o... View full abstract»

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  • Frequency-domain magnitude constraints for oversampling complex-modulated NPR filter bank system design ensuring prescribed signal-to-distortion ratio

    Publication Year: 2010, Page(s):207 - 208
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    Design approaches for oversampling complex-modulated analysis-synthesis filter bank systems (FBSs) have to control multirate disturbances due to down- and upsampling. Common design methods minimise multirate disturbances by optimising an objective function for arbitrarily given filter lengths. In contrast, approximate frequency-domain magnitude constraints are derived for FBS prototype filters suc... View full abstract»

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  • Operational amplifier immune to EMI with no baseband performance degradation

    Publication Year: 2010, Page(s):209 - 210
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    An operational amplifier (opamp) input stage achieving a high degree of immunity against electromagnetic interference (EMI) is presented. Unlike previously proposed topologies, the novel circuit does not show any significant penalty in baseband operation. The effectiveness of the proposed solution and its robustness to mismatch and process variations is tested by simulations performed with referen... View full abstract»

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  • Two-step split-junction SAR ADC

    Publication Year: 2010, Page(s):211 - 212
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    A new architecture is proposed to reduce the power consumption and capacitor area in successive-approximation register analogue-to-digital converters (SAR ADCs). Two split-junction binary-weighted capacitor arrays are used in a coarse/fine quantisation scheme. This reduces both the power consumption and the capacitor area to a small fraction of that of the original split-junction SAR ADC. View full abstract»

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  • Complementation SCR for RF IC ESD protection

    Publication Year: 2010, Page(s):213 - 214
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (597 KB)

    Complementation silicon controlled rectifiers (CSCRs) with various novel layouts are designed in 0.18 ??m RF CMOS process, including general CSCR, strip CSCR (SCSCR), island-strip CSCR (ISCSCR) and island-block CSCR (IBCSCR). SCSCR has highest FOM; however, the ISCSCR has lowest parasitic capacitance. Appropriate division layout of the CSCRs should be addressed to achieve a balance between active ... View full abstract»

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  • Alpha-matte-based depth map enhancement for hairy objects

    Publication Year: 2010, Page(s):215 - 216
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    Most existing depth estimation methods generate an erroneous depth map when a foreground object contains hairy boundaries and this error is very critical in many applications. To solve this problem, a new depth map enhancement method is proposed. The given depth map is enhanced by propagating depth values of the neighbourhood based on an alpha matte. The experiment results show that the boundary o... View full abstract»

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  • Enhanced locality sensitive discriminant analysis for image recognition

    Publication Year: 2010, Page(s):217 - 218
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (105 KB)

    An improved manifold learning method, called enhanced locality sensitive discriminant analysis (ELSDA), for image recognition is proposed. Motivated by the fact that statistically uncorrelated and parameter-free are two desirable and promising characteristics for feature extraction, a new difference-based optimisation objective function with uncorrelated constraint for appearance-based image recog... View full abstract»

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  • Non-contact voltage measurement using electronically varying capacitance

    Publication Year: 2010, Page(s):219 - 220
    Cited by:  Papers (2)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (178 KB)

    A voltage measurement methodology is presented, based on the principle of a vibrating capacitance, but implemented electronically. A transconductor with time-varying gain synthesises the vibrating capacitance, the peak to peak charge current of which changes as different DC voltages are applied to the capacitively coupled input. This technique allows for the non-invasive measurement of DC voltages... View full abstract»

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  • Dual-band HTS filter using modified dual-spiral resonators

    Publication Year: 2010, Page(s):221 - 222
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    A symmetric dual-band filter with a centre frequency of 887 MHz is presented. The filter uses a modified structure of dual spiral resonators with interdigital capacitive load. At the same resonant frequency, the resonator can occupy an area of less than 2.75% of the area of the square loop resonator. Moreover, the resonator has a very low sensitivity to substrate thickness. The resonator structure... View full abstract»

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  • Broadband transition between rectangular waveguide and substrate integrated waveguide

    Publication Year: 2010, Page(s):223 - 224
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (263 KB)

    A novel broadband waveguide-to-substrate integrated waveguide transition is presented. The transition is realised by using a fin line probe inserted into a rectangular metal waveguide. A single back-to-back transition covering the KA band is designed, fabricated and tested. Measured results show that good agreement with simulation, an insertion loss less than 1.4 dB and a return loss better than 1... View full abstract»

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  • Switched transmission-line type Q-band 4-bit MMIC phase shifter using InGaAs pin diodes

    Publication Year: 2010, Page(s):225 - 226
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    A fully integrated Q-band 4-bit MMIC phase shifter with InGaAs pin diodes has been designed and fabricated. To achieve low insertion loss and good phase shifting characteristics at Q-band frequencies, topology based on a switched transmission line is employed using a thin-film microstrip line structure implemented in the MMIC fabrication process. The fabricated phase shifter has demonstrate... View full abstract»

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  • 16-level quadrature amplitude modulation by monolithic quad-parallel mach-zehnder optical modulator

    Publication Year: 2010, Page(s):227 - 228
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    A monolithically-integrated quad-parallel Mach-Zehnder optical modulator has been fabricated. 3 and 6 dB electro-optical bandwidths of Mach-Zehnder structures embedded in the modulator were evaluated as 22 and 36 GHz, respectively. By using the monolithic optical modulator, a 10 Gbaud 16-level quadrature amplitude modulation (QAM) signal was successfully obtained. View full abstract»

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  • Simple 40 Gbit/s all-optical XOR gate

    Publication Year: 2010, Page(s):229 - 230
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    An all-optical XOR gate at 40 Gbit/s is demonstrated using ultrafast nonlinear interferometers (UNI) incorporating semiconductor optical amplifiers (SOAs), where no additional probe beam is required. The only inputs launched into the setup are the data A and B. The XOR logic of the data A and B is the sum of two components A??B and AB??, each of which is o... 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