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Electronics Letters

Issue 15 • Date July 19 2012

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Displaying Results 1 - 25 of 48
  • In brief

    Publication Year: 2012, Page(s): 890
    IEEE is not the copyright holder of this material | PDF file iconPDF (92 KB)
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  • Interview

    Publication Year: 2012, Page(s): 890
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (77 KB)

    Dr Hamit Soyel from Queen Mary University of London in the UK talks about the research behind his Letter `Automatic image enhancement using intrinsic geometrical information?? on page 917. View full abstract»

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  • Off-board power

    Publication Year: 2012, Page(s): 891
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (339 KB)

    A team from Tsinghua University, China, report an omnidirectional power receiving circuit for wireless power transfer (WPT) in capsule endoscopy (CE). The design significantly improves the power transfer efficiency, which could in future open up new diagnosis and treatment capabilities in capsules. View full abstract»

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  • Inside view

    Publication Year: 2012, Page(s): 892
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    At the University of Greenwich we have been working on several projects in the field of wireless medical instrumentation, such as wireless pulse monitors, wireless oxygen saturation monitors and applications of Bio- RFID in remote healthcare and disaster search and rescue operations. We hope that the work presented in this issue of Electronics Letters can help diabetes sufferers by removing the ne... View full abstract»

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  • Coaxially fed microstrip antenna for harmonic suppression

    Publication Year: 2012, Page(s):895 - 896
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (349 KB)

    A coaxially fed microstrip antenna using a defected ground structure (DGS) for harmonic suppression is proposed, in which the DGS is distributed around the coaxially fed location. The effectiveness of the DGS is discussed for the suppression harmonic frequencies of the antenna. Experimental results show that application of the DGS near to the coaxially fed location of the microstrip antenna can re... View full abstract»

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  • Triple band-notched UWB antenna based on complementary meander line SRR

    Publication Year: 2012, Page(s):896 - 897
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    A novel triple band-notched antenna for UWB application is proposed. The triple band-notched characteristic is obtained by etching a complementary meander line split ring resonator inside the radiation patch and ground plane of a rectangular antenna. It is proved that the triple band-notched performance at 3.31, 5.81 and 8.53 GHz can be obtained by etching two resonator structures. The proposed an... View full abstract»

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  • Dual-band high-gain resonant cavity antenna with orthogonal polarisation using slotted patch partially reflective superstrate

    Publication Year: 2012, Page(s):897 - 899
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (250 KB)

    A novel dual-band high-gain resonant cavity antenna (RCA) with orthogonal polarisation is presented. The RCA includes a single-layer single-sided superstrate of printed slotted patches located at a designated height above the ground plane of a microstrip patch antenna. The lower band has a measured gain of 18.06 dBi with the vertical polarisation (V-pol) at 10.25 GHz and the upper band has a gain ... View full abstract»

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  • Large-area RFID reader antenna for smart shelf at UHF

    Publication Year: 2012, Page(s):899 - 900
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    The design concept, geometry, simulated and measured results of a large-area RFID reader antenna for the smart shelf at UHF are presented. The antenna is implemented by cascading two layers of microstrip lines and being terminated with a matched load. The proposed antenna can produce a uniform magnetic field even though the size of the antenna is large. It has a low far-field gain and adaptability... View full abstract»

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  • Reflectarray design using similarity-shaped fragmented sub-wavelength elements

    Publication Year: 2012, Page(s):900 - 902
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (323 KB)

    A new technique for synthesising reflectarray antennas is presented. It uses fragmented elements in a way that allows the elements of the reflectarray to be shape-optimised so that a high degree of geometric similarity exists between adjacent elements. This implies that in the reflectarray each element will see an electromagnetic environment that more closely emulates the infinite periodic environ... View full abstract»

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  • Use of partial koch boundaries for improved return loss, gain and sidelobe levels of triangular patch antenna

    Publication Year: 2012, Page(s):902 - 903
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (281 KB)

    The Koch fractals beyond the third iteration take on complex geometrical shapes and thus are difficult to implement. The possible solution to achieving high performance in antennas and to alleviate implementation issues is the use of partial Koch fractals. The introduction of partial boundaries to triangular patches results in antenna designs with high gain (9.44 dBi), low sidelobe levels (≤... View full abstract»

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  • Experimental and numerical enhancement of vibrational resonance in neural circuit

    Publication Year: 2012, Page(s):903 - 905
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2054 KB)

    A neural circuit exactly ruled by the FitzHugh-Nagumo equations is excited by a biharmonic signal of frequencies f and F with respective amplitudes A and B. The magnitude spectrum of the circuit response is estimated at the low frequency driving f and presents a resonant behaviour against the amplitude B of the high frequency. For the first time, it is shown experimentally that this vibrational re... View full abstract»

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  • Blood glucose monitoring using microwave cavity perturbation

    Publication Year: 2012, Page(s):905 - 906
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (334 KB)

    An outline is presented of the design and preliminary tests of a method for tracking blood glucose levels using dielectric spectroscopy. The system designed uses a microwave cavity to measure the concentration of aqueous solutions of glucose, as a change in complex permittivity. The results of this research are very promising, finding frequency regions where only a single frequency needs to be app... View full abstract»

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  • Integrated omnidirectional wireless power receiving circuit for wireless endoscopy

    Publication Year: 2012, Page(s):907 - 908
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (395 KB)

    A novel integrated omnidirectional wireless power receiving circuit for wireless powering endoscopy is presented. Effectively combining energy from all directions, the proposed circuit achieves an efficiency level that is 16.2% higher than the previous best results. Benefiting from this circuit design, the whole power link of the wireless endoscopy attains a maximal overall efficiency of 5.4% at a... View full abstract»

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  • 65 GHz small-signal-bandwidth switched emitter follower in InP heterojunction bipolar transistors

    Publication Year: 2012, Page(s):908 - 910
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (534 KB)

    Performances of two switched emitter follower structures for large bandwidth applications have been optimised, compared, implemented and measured. These circuits have been fabricated with a 320 GHz-FT InP double heterojunction bipolar transistor process. Measurements in track mode show a small-signal bandwidth over 65 GHz for one structure and over 50 GHz for the other. Track mode SFDR ... View full abstract»

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  • Analogously tunable delay line for on-chip measurements with sub-picosecond resolution in 90 nm CMOS

    Publication Year: 2012, Page(s):910 - 911
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (195 KB)

    An analogously fine-tunable delay line in a standard 90 nm CMOS technology is proposed for use in on-chip measurements of asynchronous digital circuit elements. The implemented delay line achieves a maximum delay of 155 ps together with the possibility to fine and coarse tune the delay. Owing to its truly analogue tuning it can overcome the limitation of the minimum step sizes found in digital con... View full abstract»

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  • Investigation of pickup effect for multi-fingered ESD devices in 0.5 μm 5V/ 18V CDMOS process

    Publication Year: 2012, Page(s):911 - 913
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (658 KB)

    Pickup effect for 5V NMOS and 18V lateral double-diffused NMOS under electrostatic discharge (ESD) stress is investigated and characterised by a transmission line pulse test system in a standard 0.5 μm 5V/18V CDMOS process, respectively. Experimental results show that 5V low-voltage multi-fingered NMOS devices cannot be turned-on uniformly with more added inner pickups and thus the ESD robu... View full abstract»

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  • Offset-voltage compensation for accurate current-source circuit

    Publication Year: 2012, Page(s):913 - 914
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (313 KB)

    The offset-voltage compensation technique is proposed for an accurate current-source circuit. This current source is made of a transistor, a resistor, and operational amplifier feedback in order to achieve a high output resistance as well as high accuracy of a generated current signal. Discrepancy from the ideal value mainly results from the offset voltage of the operational amplifier. The transco... View full abstract»

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  • Rectifying characteristics of thin film self-switching devices with ZnO deposited by atomic layer deposition

    Publication Year: 2012, Page(s):914 - 916
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    To realise a rectifying device utilising ZnO, self-switching devices (SSDs) have been fabricated using ZnO thin films. The SSDs do not require a p-type doping junction or a Schottky barrier. At first, normally-off ZnO thin film transistors were fabricated, which exhibited control of threshold voltage by the channel length. Thin film SSDs using a thin film transistor structure were successfully fab... View full abstract»

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  • Sliding-mode control approach for faster tracking

    Publication Year: 2012, Page(s):916 - 917
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (138 KB)

    A new sliding-mode control method is presented in which the nominal control is derived from a manifold consisting of the standard sliding manifold expression and its derivative. It is shown that the new method yields a faster reach time. Simulation results also show that it performs with smaller error and less control effort compared to standard counterparts in tracking an autonomous nonlinear aff... View full abstract»

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  • Automatic image enhancement using intrinsic geometrical information

    Publication Year: 2012, Page(s):917 - 919
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (347 KB)

    A new image enhancement algorithm based on nonsubsampled contourlet transform is presented. Low contrast images are transformed into multi-scale and multi-directional contour information, where a nonlinear mapping function is used to modify the contour coefficients at each level. The enhancement is achieved by amplifying weak edges and inhibiting the background noise while adjusting the dynamic ra... View full abstract»

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  • DCT-like transform for image compression requires 14 additions only

    Publication Year: 2012, Page(s):919 - 921
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (306 KB)

    A low-complexity 8-point orthogonal approximate discrete cosine transform (DCT) is introduced. The proposed transform requires no multiplications or bit-shift operations. The derived fast algorithm requires only 14 additions, less than any existing DCT approximation. Moreover, in several image compression scenarios, the proposed transform could outperform the well-known signed DCT, as well as stat... View full abstract»

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  • Fast codebook design of vector quantisation

    Publication Year: 2012, Page(s):921 - 922
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (62 KB)

    To reduce the computational overhead of the codebook design of vector quantisation, a fast codebook design method is proposed. In this method, the energy distribution of vectors is improved by rearranging the elements of vectors based on the information of the energy distribution at each dimension of the initial codebook. Then using the subvectors and their characteristic values, a three-step elim... View full abstract»

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  • Mobile digital image stabilisation using SIMD data path

    Publication Year: 2012, Page(s):922 - 924
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (234 KB)

    Digital image stabilisation for mobile devices based on real-time phase correlation with support for the SIMD data path is presented. By using sub-image projection, the phase correlation process can be fitted within the real-time criteria. The proposed method acquires a global motion vector from a sub-image at the centre of the viewport, which is projected onto the x- and y-axes on which the phase... View full abstract»

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  • Slew-rate-enhanced rail-to-rail buffer amplifier for TFT LCD data drivers

    Publication Year: 2012, Page(s):924 - 925
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (450 KB)

    A high-slew-rate low-power rail-to-rail buffer amplifier, which is suitable for thin film transistor liquid crystal display (TFT LCD) data driver applications, is proposed. Previous dynamic biasing approaches become ineffective as an output signal approaches VDD or VSS supplies. However, the proposed buffer amplifier with a dynamic biasing circuit enhances the slew rate throughout the entire rail-... View full abstract»

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  • Greedy algorithm based power control technique for MIMO systems with maximum likelihood receiver

    Publication Year: 2012, Page(s):926 - 927
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

    Proposed is a greedy algorithm based power control technique to improve the minimum square Euclidean distance (MSED), which is directly related to the error performance of MIMO systems employing maximum-likelihood receivers. The basic idea is to allocate an evenly divided portion of power to the transmit antenna which will give the maximum system MSED during each iteration. In that case, the syste... 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