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Electronics Letters

Issue 16 • Date August 2 2012

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Displaying Results 1 - 25 of 42
  • In brief

    Publication Year: 2012, Page(s): 966
    IEEE is not the copyright holder of this material | PDF file iconPDF (1231 KB)
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  • Interview

    Publication Year: 2012, Page(s): 966
    IEEE is not the copyright holder of this material | PDF file iconPDF (1213 KB)
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  • Flexible power

    Publication Year: 2012, Page(s): 967
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1401 KB)

    A group in Korea have created a highly flexible, simple to manufacture thermoelectric generator designed to be worn next to the skin to provide power continuously for portable devices. The generator's flexibility allows it to sit snugly against the skin for maximum heat transfer, even over larger areas. View full abstract»

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  • mm waves in the mix

    Publication Year: 2012, Page(s): 968
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    A millimetre-wave integrated mixer that uses around 75% less power than previous designs has been presented by researchers in Taiwan. The research team at National Central University used a Darlington-pair topology to reach V-band operation, and a thin-film LC-hybrid linear combiner in 90%nm CMOS to create a compact mixer chip that should be easy to produce on a large scale for future applications... View full abstract»

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  • 2.45 GHz high-gain electrically small antenna with composite right/left-handed ladder structure

    Publication Year: 2012, Page(s):971 - 972
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    Electrically small antennas are needed to lower further the cost of wireless elements. However, the antenna gain is constrained to the Harrington limit, while the impedance matching and directivity characteristics deteriorate in electrically small antennas. Using a dipole antenna loaded with a left-handed ladder structure is a promising technique for reducing the size of antennas. Reported is the ... View full abstract»

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  • Time-modulated reflector array

    Publication Year: 2012, Page(s):972 - 974
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    The concept of a time-modulated reflector array (TMRA) is introduced and analysed. The TMRA is proposed as an alternative to conventional time-modulated array designs. The TMRA is potentially much simpler to implement in hardware than the conventional time-modulated array as it does not require a complex feed network. The results of a simple analysis of a TMRA based on an array-factor model combin... View full abstract»

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  • Band-reject ultra-wideband monopole antenna using patch loading

    Publication Year: 2012, Page(s):974 - 975
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (437 KB)

    Proposed is a new simple technique for achieving band rejection characteristics in ultra-wideband monopole antennas. Two band notches were added to an existing UWB antenna by gluing a padding patch printed on a small single-layer piece of commercial substrate. The design of the new proposed structure has a controllable rejection in the 5 GHz WLAN and 8 GHz ITU frequencies while maintaining a wideb... View full abstract»

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  • Compact diversity antenna for UHF RFID readers

    Publication Year: 2012, Page(s):975 - 977
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (355 KB)

    A diversity antenna combining four inverted-F antennas (IFAs) is evaluated for UHF RF identification (RFID) readers. Polarisation and pattern diversities are obtained for a sequentially rotated configuration of the IFAs. Mutual coupling between ports is minimised by etching quarter-wavelength slots into the ground plane. The resulting envelope correlation coefficient is less than 0.003 in the work... View full abstract»

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  • Compact quad-band reconfigurable antenna for mobile phone applications

    Publication Year: 2012, Page(s):977 - 979
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    A compact reconfigurable antenna for quad-band (GSM/DCS/PCS/ WCDMA) mobile phone applications is proposed and experimentally investigated. By independently controlling the on/off states of a pin diode placed on a radiating element, the proposed antenna can be operated in the planar inverted-F antenna (PIFA) and loop modes, respectively. The measured results show that the 6 dB reflection coefficien... View full abstract»

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  • Multiple-bridge-loop reader antenna for improved positioning and localisation

    Publication Year: 2012, Page(s):979 - 980
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Introduced is a novel HF RFID bridge reader antenna suitable for accurate positioning and localisation. Conventional HF RFID reader antennas can only indicate the presence or absence of a tag(s). The proposed reader antenna uses multiple loops to form multiple bridges so that the position of tags with respect to the reader recognition area can be obtained. The bridge-loop configuration can split t... View full abstract»

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  • Octave-band, multi-resonance CPW-fed small slot antenna for UWB applications

    Publication Year: 2012, Page(s):980 - 982
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (614 KB)

    A novel multi-resonance CPW-fed slot antenna, for UWB applications, is proposed. The proposed antenna consists of a modified fan-shaped radiating stub and a sprocket-shaped ground plane provides a wide usable fractional bandwidth of more than 155% (2.39-24.53 GHz). By inserting eight pairs of gear-shaped teeth on the sprocket-shaped ground plane, an additional eight resonances are excited and henc... View full abstract»

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  • On the efficiency of frequency reconfigurable high-Q antennas for 4G standards

    Publication Year: 2012, Page(s):982 - 983
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (198 KB)

    In the actual context of reducing antenna size and operating in multiple bands tunable antennas are investigated. Moreover, high-Q and low-Q tunable antennas are compared with respect to their efficiency. The loss issue that tunable high-Q antennas present is addressed. Using a variable capacitor as a tuning mechanism, simulations and measurements of a self-resonating antenna show the mismatch and... View full abstract»

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  • Pattern reconfigurable antenna for wireless sensor network system

    Publication Year: 2012, Page(s):984 - 985
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (390 KB)

    An antenna for a wireless sensor network for an indoor environment is proposed. The proposed antenna is composed of an artificial magnetic conductor reflector, two branched radiators, and a power divider including a switched-line phase shifter. Two branched radiators act as four bent monopoles or two crossed dipoles by the switched-line phase shifter. The power divider provides two branched radiat... View full abstract»

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  • Wearable textile antenna in substrate integrated waveguide technology

    Publication Year: 2012, Page(s):985 - 987
    Cited by:  Papers (34)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (299 KB)

    A novel wearable substrate integrated waveguide antenna fabricated entirely from textile materials is presented. The cavity-backed slot antenna operates in the 2.45 GHz industrial, scientific and medical band, for short range communication between rescue workers. A prototype of the antenna was fabricated and tested: good performance was obtained in terms of input matching and radiation pattern. Mo... View full abstract»

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  • All-CMOS low supply voltage scattered thermal monitoring front-end

    Publication Year: 2012, Page(s):987 - 988
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    Presented is a low-voltage all-CMOS scattered thermal monitoring architecture front-end designed in a 0.5 μm process. To support low-voltage operation for scaled CMOS technologies, MOSFETs operating in the subthreshold region and an amplifier with a bulk-driven technique are used. To reduce the offset error caused by device mismatches, gain boosting, dynamic offset cancellation and dynamic ... View full abstract»

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  • Charge compensation technique for switched-capacitor circuits

    Publication Year: 2012, Page(s):988 - 990
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    A charge compensation technique is proposed for switched-capacitor S/H circuits and integrators. The compensated stages achieve better linearity with low power and relaxed sampling noise specifications. Analysis and simulations show that high linearity can be achieved, even while consuming low power. View full abstract»

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  • Second-stage tuning procedure for analogue CMOS design reuse methodology

    Publication Year: 2012, Page(s):990 - 992
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    Proposed is a two-stage analogue circuit design reuse methodology by extending existing fabrication process rescaling procedures with a follow-on systematic tuning procedure stage based on DC output voltage scaling. It increases the potential for design reuse with short-channel MOSFET circuit designs when compared to the current single-stage rescaling work. Two Miller amplifier circuits were desig... View full abstract»

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  • Gabor-based weighted region covariance matrix for face recognition

    Publication Year: 2012, Page(s):992 - 993
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (100 KB)

    A novel image region descriptor, named the Gabor-based weighted region covariance matrix (GWRCM), is proposed by incorporating the weighting matrices into a Gabor-based region covariance matrix (GRCM). Based on the weighting matrix, the proposed approach can assign different weights for pixels in different face parts, so it preserves more discriminating information than the GRCM for face recogniti... View full abstract»

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  • Geometrically inspired MRF for moving object detection from mobile stereo camera

    Publication Year: 2012, Page(s):993 - 995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (381 KB)

    Detecting moving objects from an image sequence is challenging, especially when the camera is moving and the background varies significantly in every frame. In addition, classifying moving objects using only their appearances creates ambiguities in complex scenes. In this sense a Markov random field (MRF) approach is proposed incorporating a stereo vision-based structure-from-motion scheme in orde... View full abstract»

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  • Onboard vehicle detection and tracking using boosted Gabor descriptor and sparse representation

    Publication Year: 2012, Page(s):995 - 997
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    Proposed is a new onboard vehicle detection method based on a part-based model. It uses several boosted Gabor descriptors of keypoints to represent the vehicle. To perform detection, the sparse representation-based classifier is adopted to classify the extracted keypoints in video frames. Then, by using the K-means algorithm, vehicle candidates with high-density classified keypoints are gen... View full abstract»

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  • Data structures and control mechanisms for multi-target swarming simulators

    Publication Year: 2012, Page(s):997 - 998
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    Data structures and control mechanisms for multi-target swarming software simulators are presented. The advantage of the proposed approach is that a swarm, besides local self-organisation, is able to accept higher level directives on target priorities. Also, the presented mechanisms enable a swarm to dynamically change its participants' assignment on every target appearance or removal in simulatio... View full abstract»

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  • Space-time/space-time-frequency-coding-based MIMO-OFDM over power line channels

    Publication Year: 2012, Page(s):999 - 1000
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (239 KB)

    A space-time/space-time-frequency-coding-based 2 × 2 multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) power line communication system that employs a maximum ratio combining receiver, also called a rake receiver, not only improves the bit error rate performance (relative to existing schemes) but is also insensitive to crosstalk. View full abstract»

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  • Wobble-based on-chip calibration circuit for temperature independent oscillators

    Publication Year: 2012, Page(s):1000 - 1001
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (274 KB)

    An automatic calibration circuit for temperature- and process-independent oscillators and timing circuits is presented. The circuit monitors the dynamic gate-source voltage of a MOS transistor of which the temperature is changing. By adapting the bias current through this transistor towards the zero-temperature-coefficient point of the VGS, the gate-source voltage can be used in tempera... View full abstract»

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  • Electrical tunable L-band absorbing material for two polarisations

    Publication Year: 2012, Page(s):1002 - 1003
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (434 KB)

    An electrical tunable L-band absorbing material for two polarisations is presented. The proposed absorber consists of a metal resonator and four surrounded metal lines which are connected by pin diodes, and exhibits the tunable range of reflectivity reaching to -40 dB for both polarisations. In particular, for TM polarisation, the working frequency is also tunable from 1.9 to 2.1 GHz due to... View full abstract»

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  • Radiation properties of coaxial-to-coplanar transitions in K band

    Publication Year: 2012, Page(s):1003 - 1004
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (249 KB)

    A radiation and electro-magnetic (EM) field analysis of commercially available coaxial-to-coplanar transitions is presented. Radiation is quantified by measuring a crosstalk component between two Southwest Microwave's transitions using a reflective planar calibration standard placed inside. Predictive simulation results are compared to the measured data and good agreement is reported. The proposed... 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