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Electronics Letters

Issue 4 • Date February 16 2012

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Displaying Results 1 - 25 of 37
  • In brief

    Publication Year: 2012, Page(s): 190
    IEEE is not the copyright holder of this material | PDF file iconPDF (95 KB)
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  • Interview

    Publication Year: 2012, Page(s): 190
    IEEE is not the copyright holder of this material | PDF file iconPDF (117 KB)
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  • Inside view

    Publication Year: 2012, Page(s): 191
    IEEE is not the copyright holder of this material | PDF file iconPDF (296 KB)
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  • Shrinking dielectrics

    Publication Year: 2012, Page(s): 192
    IEEE is not the copyright holder of this material | PDF file iconPDF (244 KB)
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  • Compact circularly-polarised microstrip antenna with symmetric-slit

    Publication Year: 2012, Page(s):195 - 196
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (286 KB)

    A single-fed compact circularly-polarised (CP) microstrip antenna is designed and experimentally demonstrated. By embedding the symmetric-slit in the radiation patch and protruding a pair of perturbation elements at the boundary of the centre square slot, the proposed antenna can obtain good CP performance with effective size reduction at a fixed frequency operation. Meanwhile, an impedance transf... View full abstract»

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  • Efficiency characterisation of multi-port antennas

    Publication Year: 2012, Page(s):196 - 198
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    A simple radiation efficiency metric is introduced to include the effects of non-ideal source/receiver impedances. The features of this parameter are highlighted and its compact formula is derived. The notion of mean matching efficiency is established. Simulations prove that this matching efficiency is quite useful in a quick estimation of diversity performance of multi-port antennas in rich isotr... View full abstract»

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  • Wideband fractal shaped slot antenna for X-band application

    Publication Year: 2012, Page(s):198 - 199
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    A novel fractal patterned iris loaded cross dipole slot antenna along the broad wall of a rectangular waveguide at X-band is proposed with wideband operation. Tapering the junction of the cross slots results in wide impedance matching. Bandwidth enhancement better than 2 GHz is achieved with optimisation of iris depth and inclusion of a second iteration slot in the vicinity of the primary cross sl... View full abstract»

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  • High accuracy Hough transform based on butterfly symmetry

    Publication Year: 2012, Page(s):199 - 201
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (203 KB)

    The theoretical symmetry in Hough transform (HT) butterflies is addressed. The reason the symmetry is damaged in real HT butterflies is analysed and employed to propose a high accuracy HT. Experiment demonstrates that the proposed method obtains high accuracy straight line parameters without the exact position of the HT peak. View full abstract»

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  • 200 kHz swept light source equipped with KTN deflector for optical coherence tomography

    Publication Year: 2012, Page(s):201 - 202
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    A new light source for swept-source optical coherence tomography (SS-OCT) is presented, namely, an external-cavity LD equipped with a KTN electro-optic deflector. The KTN deflector is unique in being very fast and simultaneously providing an appreciable deflection caused by injected carriers. Being free from mechanical resonance, the 1.3 m laser exhibits a scanning range of almost 80 nm up to 200 ... View full abstract»

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  • Investigation of efficient ASK demodulation for wirelessly powered biodevices

    Publication Year: 2012, Page(s):203 - 204
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (246 KB)

    A new hardware architecture of amplitude shift keying (ASK) demodulation for portable wirelessly data-combined power transfer, especially those biomedical applications requiring permanently harvested power through radio frequency, is proposed. The architecture along with its circuit details provides dramatically enhanced energy efficiency in the system while at the same time achieving cost-effecti... View full abstract»

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  • Normalised subband adaptive filter with variable step size

    Publication Year: 2012, Page(s):204 - 206
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    Proposed is a normalised subband adaptive filter algorithm with a variable step size based on the mean-square deviation (MSD) analysis. Since the spectrum of each input signal in subbands is close to that of white noise, the MSD can be approximated. The step size in this study is chosen such that the MSD undergoes the largest decrease from one iteration to the next, which leads to a fast convergen... View full abstract»

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  • VCO based multi-stage noise shaping ADC

    Publication Year: 2012, Page(s):206 - 208
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    A way to combine several analogue-to-digital converters (ADCs) based on voltage-controlled oscillators (VCOs) to implement a multi-stage noise shaper (MASH) is proposed. By means of a simple digital circuit, the phase quantisation error in one stage is extracted as a pulsed signal. Then, this pulsed signal modulates the VCO in the next stage. First, the equations that describe the system are discu... View full abstract»

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  • Single waveguide cell with double polarisations to generate standard electromagnetic fields

    Publication Year: 2012, Page(s):208 - 209
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (451 KB)

    A new single waveguide cell for EMC testing, the uniform area of which is 0.216×0.296m, is presented. It is possible to change easily the polarisation of standard EM fields, such as the TTEM cell. The field uniformity of the proposed waveguide cell is compared to that of the TTEM cell. It is shown that it provides the standard EM fields with high field uniformity in dual polarisations simul... View full abstract»

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  • Describing corners using angle, mean intensity and entropy of informative arcs

    Publication Year: 2012, Page(s):209 - 210
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (270 KB)

    Corners are important features in images as they help identify the boundaries of objects. For real-time applications, it is essential that corners can be detected and matched reliably and rapidly. Presented is a descriptor, AMIE, which is compatible with standard corner detectors. It shows that the accuracy of AMIE is similar to that of the popular BRIEF descriptor, yet somewhat quicker to calcula... View full abstract»

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  • Edge detection with multiscale products for SAR image despeckling

    Publication Year: 2012, Page(s):211 - 212
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (249 KB)

    A despeckling algorithm of a synthetic aperture radar (SAR) image is proposed, which can effectively preserve edges while cleanly despeckling. The proposed algorithm is robust, simple, and effective, without any a priori information, which employs multiscale products in stationary bandlet transform (SBT) domain to detect edges, and utilises SBT to denoise the edge-removed image. Experimenta... View full abstract»

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  • Hybrid patch similarity for image denoising

    Publication Year: 2012, Page(s):212 - 213
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (121 KB)

    Presented is a new patch-based denoising method based on hybrid similarity, combining structure similarity and homogeneity similarity. The proposed method makes a good balance between the two similarity measures, using homogeneity similarity to enhance the patch regularity assumption, while keeping the block matching accuracy by structure similarity. Moreover, the use of hybrid similarity enables ... View full abstract»

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  • Macroblock-dependent zigzag scanning algorithm for H.264/AVC

    Publication Year: 2012, Page(s):213 - 215
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (118 KB)

    A macroblock-dependent zigzag scanning (MDZS) algorithm for H.264/AVC to reduce bit rates is presented. By reordering the statistical occurrence values introduced from quantised coefficients of the final mode in descending order, the proposed MDZS algorithm generates a representative zigzag scanning pattern for each macroblock. Experimental results show that the proposed MDZS algorithm reduces the... View full abstract»

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  • CRB of carrier frequency offset estimation with virtual subcarriers

    Publication Year: 2012, Page(s):215 - 216
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

    The Cramer Rao bound (CRB) of the carrier frequency offset (CFO) estimation with virtual subcarriers in orthogonal frequency division multiplexing (OFDM) systems is derived. The obtained CRB gives a lower bound, which is much tighter than the modified CRB, for the variance of any unbiased CFO estimate. Also, the maximum likelihood estimator can achieve this tight CRB at high signal-to-noise ratio.... View full abstract»

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  • Low-density parity-check codes with quantised messages on binary symmetric channel

    Publication Year: 2012, Page(s):217 - 218
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (137 KB)

    This reported work concerns the design and evaluation of low-density parity-check codes over a binary symmetric channel in the presence of a fixed-point min-sum decoder. In this case, using a discretised density evolution method together with an elegant linear programming approach, the constraint on the number of quantisation levels is incorporated in the optimisation process to derive a proper LD... View full abstract»

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  • On the LIMES approach to spectral analysis of irregularly sampled data

    Publication Year: 2012, Page(s):218 - 220
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (113 KB)

    LIMES (LIkelihood-based Method for Estimation of Spectra) is a recently introduced non-parametric approach for the spectral analysis of regularly or irregularly sampled data. While LIMES is a statistically powerful approach (owing to its maximum-likelihood character), it is computationally rather intensive for large data sets; additionally, the variance of its estimation errors increases somewhat ... View full abstract»

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  • Broadband and miniaturised LTCC quadrature hybrid using stacked multi-section structure

    Publication Year: 2012, Page(s):220 - 221
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (397 KB)

    A broadband low-temperature co-fired ceramic (LTCC) quadrature hybrid using a stacked multi-section structure is proposed. The idea of placing multi-sections vertically on each LTCC layer is implemented to achieve broadband characteristics and miniaturised area. The overall dimensions of the proposed hybrid are only 9.5 × 8 × 0.9×mm and it achieves a size reduction of 80 ... View full abstract»

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  • Compact elliptic-function lowpass filter using improved mushroom resonator cells

    Publication Year: 2012, Page(s):221 - 222
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    An improved mushroom resonator cell is proposed for the design of the compact elliptic-function lowpass filter (LPF). This resonator cell provides sharp skirt and wide stopband for the LPF. As an example, a five-pole elliptic-function LPF with cutoff frequency 2.5 GHz has been designed and fabricated. The measurement results show good agreement with those of simulations. The measured insertion los... View full abstract»

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  • Lossy microwave filter synthesis technique

    Publication Year: 2012, Page(s):222 - 224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    An easy and straightforward technique for the synthesis of lossy coupled-resonator filters is presented. A lossy filter designed by attachment of attenuators is transformed into a realisable lossy filter through linear operations of its admittance matrix and optimisations. This technique can synthesise lossy symmetric filters, asymmetric filters and different loss level filters. View full abstract»

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  • Microstrip-line millimetre-wave bandpass filter using interdigital coupled-line

    Publication Year: 2012, Page(s):224 - 225
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (207 KB)

    An interdigital microstrip coupled-line bandpass filter is proposed for millimetre-wave application. A quadruple-mode microstrip-line resonator is designed to constitute the passband. The interdigital coupled-line sections are designed as the input/output network of the resonator. Meanwhile, sharp selectivity of the passband is achieved. As design examples, the in-band and out-of-band performances... View full abstract»

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  • Practical method for determining inductance and capacitance of metamaterial resonators

    Publication Year: 2012, Page(s):225 - 227
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (351 KB)

    A practical approach to determining the distributed capacitance and inductance of individual metamaterial resonators is demonstrated. By loading a set of lumped capacitors onto the resonator, the resonance frequency can be measured as a function of the load capacitance. The capacitance and inductance values of the resonator are then determined by relating the equivalent circuit model to the measur... 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