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Electronics Letters

Issue 23 • Date November 8 2012

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Displaying Results 1 - 25 of 47
  • In brief

    Publication Year: 2012 , Page(s): 1438
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  • Interview

    Publication Year: 2012 , Page(s): 1438
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (101 KB)  

    Dr Zheng Wang from Tianjin University in China talks about the research behind his Letter 'Automatically fast determining of the feature number for ranking based feature selection' on page 1462. View full abstract»

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  • Shifting boundaries

    Publication Year: 2012 , Page(s): 1439
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (322 KB)  

    US researchers report new RF power limiters based on III-Nitride materials that have unprecedented high operating voltages, excellent temperature stability and radiation hardness. Fully planar and simple to fabricate, these limiters could be used in nearly any type of microwave integrated circuit. View full abstract»

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  • Inside view

    Publication Year: 2012 , Page(s): 1440
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (300 KB)  

    Why is wavelength detection important? There are many different fields where detection of the colour or the wavelength of objects - in our case, LEDs - is interesting. These areas include the consumer market, the automotive sector and the industrial sector. For example, more and more LED backlights are being used for display equipment and for such displays to maintain accurate colour rendition, it... View full abstract»

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  • Broadband planar antenna based on CRLH structure for DVB-H and GSM-900 applications

    Publication Year: 2012 , Page(s): 1443 - 1444
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (608 KB)  

    A broadband planar antenna is developed for DVB-H and GSM-900 handset applications. The planar antenna is based on composite right- and left-hand (CRLH) structures, of which the resonant frequencies are determined by the four CRLH parameters. It has been demonstrated by simulation and experiment that the proposed antenna can achieve a bandwidth of about 70%, covering the DVB-H band for return loss... View full abstract»

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  • Array pattern synthesis using sparse representation of beampattern

    Publication Year: 2012 , Page(s): 1444 - 1446
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (231 KB)  

    A new array pattern synthesis method is proposed by using the concept of a sparse representation of beampattern, in which array pattern synthesis is achieved by evaluating the sparsity of beampattern and combining with a set of constraints on magnitude response. The proposed method can not only achieve a low sidelobe level, but also flexibly control the robust response region with specified beamwi... View full abstract»

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  • Multiband loaded fractal loop monopole antenna for USB dongle applications

    Publication Year: 2012 , Page(s): 1446 - 1447
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (428 KB)  

    A novel multiband loaded fractal loop monopole antenna using a Minkowski model is proposed. It is composed of a short monopole with a loaded fractal loop. The loaded fractal loop parameters are optimised starting from the Minkowski fractal model. The resulting antenna has a compact size of 10 × 45 × 0.8×mm3, which is suitable for USB dongle applications. From the me... View full abstract»

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  • Broadband circularly-polarised antenna consisting of four notch slot radiators

    Publication Year: 2012 , Page(s): 1447 - 1449
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (407 KB)  

    A broadband antenna consisting of four notch slots is proposed to generate circularly-polarised radiation. Wide bandwidth is achieved by using notch slots operating in the double-resonance range. A separate feeding network is designed to meet the requirement of sequential rotation excitation for the four slots maintaining a corresponding phase difference of 90° between adjacent slots. Simul... View full abstract»

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  • Power interference cancellation for dual-band transcutaneous bio-implant systems

    Publication Year: 2012 , Page(s): 1449 - 1451
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (226 KB)  

    An integrated circuit structure for a dual-band transcutaneous bio-implant system that can remove the problematic power interference coupled into the weak data telemetry signal is presented. The unwanted effect of coupled power interference is efficiently suppressed through a feedback cancellation that directly annihilates the interference with an optimally tuned fraction of the received power sig... View full abstract»

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  • Low-cost, CMOS compatible, Ta2O5-based hemi-memristor for neuromorphic circuits

    Publication Year: 2012 , Page(s): 1451 - 1452
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (395 KB)  

    In the past, tantalum oxide devices have been used to create non-volatile digital memories, whilst neglecting the analogue memristive characteristics of such devices. In this Letter, it is shown that these devices can provide a low-cost, low-power solution for hemi-memristive devices, when used in their pre-formed, memristive region, whilst being fully CMOS compatible. Furthermore, measurements ar... View full abstract»

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  • Ultra-low voltage implicit multiplexed differential flip-flop with enhanced noise immunity

    Publication Year: 2012 , Page(s): 1452 - 1454
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (242 KB)  

    An ultra-low voltage 22T implicit multiplexed differential (IMD) flip-flop (FF) is proposed. An implicit multiplexer is designed to simplify the differential FF complexity, while its control data path is able to enhance the FF noise immunity as well. So, the fully static IMD-FF with modified differential topology provides a sufficient noise margin under voltage scaling. On the other hand, the IMD-... View full abstract»

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  • Charge controlled memristor-less memcapacitor emulator

    Publication Year: 2012 , Page(s): 1454 - 1455
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (489 KB)  

    Recently, many promising applications are oriented towards the new memristive elements. But since these elements are not commercially available yet, the memristive elements emulators are very important. Introduced is a new memcapacitor emulator without using any memristor. The circuit concept and mathematical modelling are discussed analytically and numerically to validate the operation of the pro... View full abstract»

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  • Efficient integrated AES crypto-processor architecture for 8-bit stream cipher

    Publication Year: 2012 , Page(s): 1456 - 1457
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (160 KB)  

    Adoption of the Advanced Encryption Standard (AES) as a symmetric encryption algorithm for numerous applications requires a low cost and low power design. Presented is a new 8-bit stream cipher architecture core for an application specific integrated circuit AES crypto-processor. The chip area and power are optimised along with high throughput. It is implemented in a 130nm CMOS process and support... View full abstract»

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  • Dual estimator-based compensation for dead time and nonlinearity unaffected by parameter variations in PMSM drive

    Publication Year: 2012 , Page(s): 1457 - 1459
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (351 KB)  

    A dual estimator-based compensation scheme for the dead time and inverter nonlinearity unaffected by parameter variations in an inverter-fed permanent magnet synchronous motor (PMSM) drive is presented. Using the proposed scheme, the disturbance voltage caused by the dead time and nonlinearity can be effectively estimated even in the presence of parameter variations without any additional circuits... View full abstract»

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  • Precision tracking control of piezoelectric actuator based on bouc-wen hysteresis compensator

    Publication Year: 2012 , Page(s): 1459 - 1460
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (380 KB)  

    A Bouc-Wen model and parameter identification method is presented to describe the hysteresis characteristics in a piezoelectric actuator. Based on the model, a new feedback control scheme with a hysteresis compensator is proposed for the precise tracking control of the piezoelectric actuator. To verify the efficiency of the proposed control method, an experimental study in a piezoelectric actuator... View full abstract»

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  • Printed four arcs coupler in cylindrical cavity for permittivity measurement

    Publication Year: 2012 , Page(s): 1460 - 1462
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (470 KB)  

    A novel printed four arcs coupler is proposed. Because of the central symmetry of the coupler, the cavity has a clear TE011 mode for measuring the complex permittivity. Its characteristics are compared with measurement and simulation results. Reasonable agreement has been observed, fully validating the design of the proposed coupler. This method has the advantages of simple setting of t... View full abstract»

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  • Automatically fast determining of feature number for ranking-based feature selection

    Publication Year: 2012 , Page(s): 1462 - 1463
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (226 KB)  

    The proposed feature number determining method for the ranking-based feature selection problem builds a convex hull in high-dimensional space for each category in the training dataset and estimates the discriminative degree by calculating the overlapped proportion of these high-dimensional convex hulls. Normalising these discriminative degrees, an initial selected feature number can be determined,... View full abstract»

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  • Efficient colour texture image retrieval by combination of colour and texture features in wavelet domain

    Publication Year: 2012 , Page(s): 1463 - 1465
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (97 KB)  

    A new approach for image retrieval by combination of colour and texture features is proposed. This approach uses the histogram of feature vectors, which are constructed from the coefficients of some subbands of wavelet transform and chosen according to their intrinsic characters. A K-means algorithm is used to quantise feature vectors. The experimental results both on small size databases (40 clas... View full abstract»

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  • Image similarity index based on moment invariants of approximation level of discrete wavelet transform

    Publication Year: 2012 , Page(s): 1465 - 1467
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (213 KB)  

    Subjective quality measures based on the human visual system for images do not agree well with well-known metrics such as mean squared error and peak signal-to-noise ratio. Recently, the structural similarity measure (SSIM) has received acclaim owing to its ability to produce results on a par with the human visual system. However, experimental results indicate that noise and blur seriously degrade... View full abstract»

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  • Life time extension method for simultaneous emission driving AMOLED displays

    Publication Year: 2012 , Page(s): 1467 - 1468
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (268 KB)  

    A life time extension method for simultaneous emission driving active matrix organic light emitting diode (AMOLED) displays is proposed. The proposed driving method extends emission time by driving even and odd row lines separately. The extended emission time reduces organic light emitting diode (OLED) degradation because the current density of the OLED decreases as emission time increases. The pr... View full abstract»

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  • Generalised fuzzy local information C-means clustering algorithm

    Publication Year: 2012 , Page(s): 1468 - 1470
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (105 KB)  

    Fuzzy C-means is an efficient algorithm for data clustering. The fuzzy local information C-means (FLICM) algorithm was introduced by Krinidis and Chatzis for image clustering and it was proved that it has very good properties. Presented is a generalisation of the fuzzy local information C-means clustering algorithm, in order to be applicable to any kind of input data sets instead of images. The ge... View full abstract»

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  • Low-cost single error correction multiple adjacent error correction codes

    Publication Year: 2012 , Page(s): 1470 - 1472
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (129 KB)  

    Soft errors that affect flip-flops are a major issue in advanced electronic circuits. As technology scales, multiple bit errors become more likely. This limits the applicability of traditional protection techniques like triplication with voting or single error correction codes that can correct only one error. Multiple errors tend to affect adjacent bits, and therefore it is interesting to use erro... View full abstract»

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  • Robust capon beamformer based on direction search

    Publication Year: 2012 , Page(s): 1472 - 1473
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (175 KB)  

    In the presence of pointing errors, a direction search based robust Capon beamformer is proposed. The direction of the desired signal is first estimated by searching for the local maximum of the array output power using the first-order Taylor series expansion of the array steering vector, and then the robust Capon beamformer is developed with the estimated direction as the presumed one. View full abstract»

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  • DGS embedded transformed radial stub for ultra-wide stopband lowpass filter

    Publication Year: 2012 , Page(s): 1473 - 1475
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (321 KB)  

    A novel lowpass filter (LPF) with a wide stopband by using defected ground structures (DGSs) and a transformed radial stub (TRS) in combination is proposed. The characteristics of DGS cells are investigated and the DGS embedded TRS LPFs are designed and verified by experiment. The designed DGS embedded TRS LPF demonstrates a passband insertion loss of less than 1dB, a cutoff frequency (fc) ... View full abstract»

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  • Publication Year: 2012 , Page(s): 1475 - 1476
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (397 KB)  

    By employing the coplanar waveguide feeding method, a dual-band dual-mode bandpass patch filter, with flexible frequency ratio and fractional bandwidth, is proposed. Two resonant frequency bands are achieved by using two stacked square patches with different cross slots etched, which are simultaneously excited by the centre CPW fed lines. The frequency ratio and fractional bandwidths can be contro... 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