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Electronics Letters

Issue 7 • March 31 2011

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Displaying Results 1 - 25 of 36
  • In brief

    Publication Year: 2011, Page(s): 418
    IEEE is not the copyright holder of this material | PDF file iconPDF (79 KB)
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  • Interview

    Publication Year: 2011, Page(s): 418
    IEEE is not the copyright holder of this material | PDF file iconPDF (93 KB)
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  • GaSb lasers get pulses racing

    Publication Year: 2011, Page(s): 419
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (243 KB)

    Near-transform limited optical pulses of 384 fs at 1960 nm have been generated from a passively modelocked gallium antimonide-based disk laser. Collaborating researchers from Tampere University of Technology in Finland and Max Born Institute (MBI) in Berlin, Germany, developed a fast GaSb-based saturable absorber mirror to modelock the laser and achieved the shortest pulses so far for this materia... View full abstract»

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  • Light as a trigger

    Publication Year: 2011, Page(s): 420
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Silicon carbide thyristors can be optically triggered by commercially available UV LEDs, researchers have shown. This result, from collaborating institutions in France and Germany, demonstrates how applications taking advantage of silicon light-triggered thyristors today will also be able to benefit from the use of SiC. View full abstract»

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  • Bandstop bulk acoustic wave filter based on double-ladder filter topology

    Publication Year: 2011, Page(s):423 - 424
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    A simple and successful bulk acoustic wave filter configuration based on the double-ladder topology is presented. Unlike the conventional double-ladder topology, this new one allows one to obtain either dualband or wideband bandstop responses. The predicted results are validated with measured data. View full abstract»

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  • Generalised Butterworth-Van Dyke equivalent circuit for thin-film bulk acoustic resonator

    Publication Year: 2011, Page(s):424 - 426
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    A generalised Butterworth-Van Dyke (GBVD) equivalent circuit model for a thin-film bulk acoustic resonator (FBAR), especially for a FBAR with a high electromechanical coupling constant (kt2), is presented. The derivation starts from the ideal impedance formula for the FBAR, then acoustic loss, dielectric loss, and electrode electrical loss are introduced step by step. Results... View full abstract»

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  • Loop-type ground antenna using resonated loop feeding, intended for mobile devices

    Publication Year: 2011, Page(s):426 - 427
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    A loop-type ground antenna, designed as a rectangular ground clearance connected by a capacitor, is proposed for mobile devices. The electromagnetic mechanism underlying the antenna operation is based on a new feeding method; a capacitor is used to cause a current loop to resonate at the operating frequency band. The proposed antenna is 5 × 3 mm and is easily implemented within mobile devic... View full abstract»

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  • Human skin permittivity models for millimetre-wave range

    Publication Year: 2011, Page(s):427 - 428
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    The complex permittivity of the human skin has been measured in vivo in the 10-60-GHz range using a recently developed coaxial slim probe. The results are compared with the literature data at millimetre waves, and a broad-band Cole-Cole model is proposed for several locations on the arm, namely at the palm, wrist, and forearm. This reported study provides relevant data required for studying... View full abstract»

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  • Yagi-Uda antenna with small size for vehicles

    Publication Year: 2011, Page(s):428 - 430
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (174 KB)

    A compact Yagi-Uda antenna for vehicle directional communications in tactical VHF (30-88-MHz) is presented. A special double-folded monopole is designed as the element of the Yagi-Uda antenna to realise compact size and high directivity. The proposed antenna designed and optimised at 59-MHz can utilise the vehicle space reasonably with greatly compact height (0.1199-) and space between elements (0... View full abstract»

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  • Reconfigurable beam-steering antenna using double loops

    Publication Year: 2011, Page(s):430 - 431
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    A novel reconfigurable beam-steering antenna composed of double loops is presented. The operation frequency of the antenna is 14.5 GHz. The antenna using two artificial switches configures three cases (case 1, case 2, case 3), and has three maximum beam directions of Ømax = 0, θmax = 0° (case 1), Ømax = 230°, θ... View full abstract»

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  • Wrist-wearable zeroth-order resonant antenna for wireless body area network applications

    Publication Year: 2011, Page(s):431 - 433
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (322 KB)

    Proposed is a zeroth-order resonant antenna placed on a wrist for wireless body area network (WBAN) applications. The proposed antenna is insensitive to human body effects and its curvature shape, owing to a bottom ground plate and zero phase constant features. The antenna's performance is simulated and measured through body equivalent liquid and the human body. The radiation patterns and reflecti... View full abstract»

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  • Current-input current-output CMOS logarithmic amplifier based on translinear Ohm??s law

    Publication Year: 2011, Page(s):433 - 434
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    State-of-the-art logarithmic amplifiers use a transimpedance technique based on the exponential dependence between input current and output voltage as exhibited by p-n junction diodes, bipolar transistors and MOS transistors in the subthreshold region. Presented is a CMOS current-input current-output logarithmic amplifier based on a translinear Ohm's law principle which involves a floating voltage... View full abstract»

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  • Decoupled 4T dynamic CAM suitable for high density storage

    Publication Year: 2011, Page(s):434 - 436
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (219 KB)

    A new four-transistor dynamic CAM (DCAM) is introduced. The DCAM design addresses the inherent data retention problem by proposing a modified sensing scheme. The results indicate over an order of magnitude improvement in data retention time. In addition, the DCAM structure realises a decoupled match-line structure, which enables high density configurations not possible from previous 4T CAM approac... View full abstract»

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  • Efficient I/O processing scheme for flash memory storage systems

    Publication Year: 2011, Page(s):436 - 437
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    An efficient I/O processing scheme for flash memory storage systems is presented. The scheme minimises the I/O processing time of flash memory by removing unnecessary context switches and overlapping the I/O polling time with page frame allocation procedures. Measurement studies show that the proposed scheme improves the I/O performance of flash memory significantly. View full abstract»

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  • Controllable forms for stabilising pole assignment design of generalised bilinear systems

    Publication Year: 2011, Page(s):437 - 439
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (70 KB)

    Bilinear structures are able to represent nonlinear phenomena more accurately than linear models, and thereby help to extend the range of satisfactory control performance. However, closed loop characteristics are typically designed by simulation and stability is not guaranteed. In this reported work, it is shown how bilinear systems are a special case of the more general state dependent parameter ... View full abstract»

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  • Hybrid motion estimation algorithm for secondary SP-frame coding based on inter-frame correlation

    Publication Year: 2011, Page(s):439 - 441
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (229 KB)

    A hybrid motion estimation algorithm for secondary SP-frame coding is proposed. This hybrid algorithm effectively combines two existing techniques: one provides high coding efficiency and the other is computationally less intensive. The combination is based on inter-frame correlation, which is measured using the bit-count of its corresponding primary SP-frame. Experimental results show that this i... View full abstract»

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  • Measuring shape rectangularity

    Publication Year: 2011, Page(s):441 - 442
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (94 KB)

    A new method for measuring shape rectangularity is introduced. The new shape measure is invariant with respect to similarity transformations, ranges over the interval (0,1] and picks the value 1 if and only if the measured shape is a rectangle. The measure is theoretically well founded and has a clear geometric meaning, i.e. it indicates how the shape considered differs from a rectangle. So, the m... View full abstract»

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  • Optimal stopping condition for iterative image deconvolution by new orthogonality criterion

    Publication Year: 2011, Page(s):442 - 444
    Cited by:  Papers (2)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (158 KB)

    The stopping condition is a common problem for non-regularised deconvolution methods. Introduced is an automatic procedure for estimating the ideal stopping point based on a new measure of independence, checking an orthogonality criterion of the estimated signal and its gradient at a given iteration. An effective lower bound estimate than the conventional ad hoc methods is provided, proving its su... View full abstract»

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  • Efficient packet combining based on packet-level coding

    Publication Year: 2011, Page(s):444 - 445
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (87 KB)

    A new packet-combining (PC) scheme based on packet-level coding is proposed. Through feedback, the receiver controls the transmitting node to encode (XOR) source packets. Efficient methods to combat even-errors among erroneous packets are investigated. Also proposed is a reduced-complexity decoder. Numerical results show that the proposed scheme can significantly outperform the ARQ scheme or PC wi... View full abstract»

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  • Compact bandpass filter for RFID reader applications

    Publication Year: 2011, Page(s):445 - 447
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (154 KB)

    A novel filter prototype composed of a slotline resonator and back-to-back microstrip-slotline transition is an eligible candidate for radio-frequency identification (RFID) reader applications. Two microstrip feedlines are placed on the opposite plane, perpendicular to the slotline resonator, which is further twisted to an M shape to reduce the overall filter size, thus assigning two transmission ... View full abstract»

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  • Enhanced prediction of GaN MISHEMT RF power performance using improved large-signal model

    Publication Year: 2011, Page(s):447 - 448
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (167 KB)

    An empirical large-signal model for a high-power AlGaN/GaN metal-insulator-semiconductor HEMT (GaN MISHEMT) utilising improved drain current (I-V) and gate charge (Q-V) formulation is presented. The proposed modelling equations accurately model the asymmetric bell-shaped transconductance (Gm) and gate capacitance (C11) characteristics over a wide bias range of operation. T... View full abstract»

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  • Miniaturised 60 GHz rectangular ring bandpass filter in 90 nm CMOS technology

    Publication Year: 2011, Page(s):448 - 450
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (193 KB)

    A dual-mode rectangular ring bandpass filter at 60 GHz using 90 nm CMOS process is presented. Transmission lines in the ring are converted into meander lines to reduce the size of the ring. Capacitors are also added at four corners of the rectangle ring to miniaturise further the core size of the filter to 355 × 335 μm. The measured insertion loss is 4.2 dB at the centre frequency 59... View full abstract»

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  • Method to design microwave band-stop filter based on CPW

    Publication Year: 2011, Page(s):450 - 451
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (206 KB)

    A new method to design a band-stop filter is presented. The impedances of coplanar-waveguide (CPW) structures are used to design the filter, and the conformal transformation is utilised to calculate the capacitance of structures in the coplanar-waveguide. The design and experimental characterisation of the ultra-wideband of a fully differential filter is also presented. The performance of the filt... View full abstract»

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  • Thin film plate acoustic resonators for integrated microwave power oscillator applications

    Publication Year: 2011, Page(s):452 - 453
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    Two-port film plate acoustic resonators (FPAR) devices operating on the lowest order symmetric Lamb wave mode (S0) in C-oriented AlN membranes on Si were fabricated and tested for their power handling capabilities in a feedback-loop power oscillator circuit. The FPAR was operated at an incident power level of 24 dBm for several weeks without performance degradation. Its flicker noise constant was ... View full abstract»

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  • Thin-film transmission lines using cyclic olefin copolymer for millimetre-wave and terahertz integrated circuits

    Publication Year: 2011, Page(s):453 - 454
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (181 KB)

    Thin-film microstrip lines and a grounded coplanar waveguide using a cyclic-olefin copolymer as low-loss thin film have been fabricated and characterised up to 220 GHz. Attenuation as low as 0.6 dB/mm around 220 GHz has been measured on a grounded coplanar waveguide with a 22 m-thick cyclic-olefin copolymer thin film. 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