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Electronics Letters

Issue 1 • Date January 7 2010

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Displaying Results 1 - 25 of 64
  • In Brief

    Publication Year: 2010, Page(s): 2
    IEEE is not the copyright holder of this material | PDF file iconPDF (87 KB)
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  • Editorial

    Publication Year: 2010, Page(s): 2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (93 KB)

    Perhaps because of recent economic uncertainties, many have focussed on the challenges that the world faces rather than its opportunities. This has been particularly true of the scientific community, where the results of research have raised major issues concerning the importance of growing consumption and energy generation on climate, energy, water and health. View full abstract»

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  • Connecting the solar system

    Publication Year: 2010, Page(s):3 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (389 KB)

    Space communications systems that are essential to a range of ambitious future missions are being developed by NASA. A report on a recent advancement, a prototype of an effi cient Ka-band microwave power combiner that sums the outputs from two unequal gallium arsenide power amplifi ers to boost the overall output power, is presented in this issue of Electronics Letters by E. Wintucky, R. Simons, J... View full abstract»

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  • Interview

    Publication Year: 2010, Page(s): 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (90 KB)

    Laser diodes producing picosecond pulses ten times higher in power than today??s commercial single pulse laser diodes have been demonstrated by researchers in Finland. Professor Juha Kostamovaara, head of the Electronics Laboratory at the University of Oulu tells us more. View full abstract»

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  • Compound frequency selective surface with quasi-elliptic bandpass response

    Publication Year: 2010, Page(s):7 - 8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (331 KB)

    A compound frequency selective surface (FSS) with quasi-elliptic bandpass response is presented. The new FSS element comprises unit cells of two kinds of FSSs with one transmission zero. The FSS formed by this new element integrates the two transmission zeros of the original FSSs in one bandpass response curve and realises the quasi-elliptic filter response. Both theoretical and experimental inves... View full abstract»

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  • Indirect coupling method for RFID tag antenna design

    Publication Year: 2010, Page(s):8 - 10
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (230 KB)

    Proposed is an indirect coupling method for designing an RFID tag antenna, which can not only achieve broadband operation, but can also conveniently implement a complex conjugate impedance match between an antenna and an RFID chip. An equivalent circuit model of the proposed coupling method is presented to characterise the performance of the antenna. An example is included to demonstrate the coupl... View full abstract»

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  • UHF reader loop antenna for near-field RFID applications

    Publication Year: 2010, Page(s):10 - 11
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (278 KB)

    A novel reader loop-type antenna for ultra-high-frequency (UHF) near-field radio frequency identification (RFID) applications is presented. This antenna, printed on a 0.8 mm-thick FR4 substrate with a diameter of 16 cm, is composed of four curved strips and four pairs of coupled stubs, and achieves a wide impedance bandwidth from 840 to 1300 MHz. The proposed structure can make large currents alon... View full abstract»

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  • Compact and contact quad-band (DVB-H UHF/L, WLAN 11a/b) antenna for PMP applications

    Publication Year: 2010, Page(s):11 - 13
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    The quad-band antenna, which is composed of two compact dual-band antennas, is presented for potable media player (PMP) applications. The antenna for the broadcasting dual-band (DVB-H UHF; 470 - 862 - MHz, L; 1452 - 1492 - MHz) is composed of a planar inverted F-shaped antenna with an input matching circuit. The antenna for the communication dual-band (WLAN 11b; 2.4 - 2.5 - GHz, 11a; 5.15 - 5.8 - ... View full abstract»

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  • Compact CPW-fed dual-band antenna

    Publication Year: 2010, Page(s):13 - 14
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (381 KB)

    A novel coplanar waveguide (CPW) antenna is proposed for dual-band WLAN applications. It comprises a rectangular patch, a rectangular notch cut at the lower edge of the patch and a CPW transmission line. The rectangular patch together with the ground plane of the coplanar waveguide radiates at the lower frequency band, 2.4 GHz for IEEE 802.11b/g, while the rectangular notch resonates in the upper ... View full abstract»

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  • Coupled-line-fed dual-notch ultra-wideband antenna

    Publication Year: 2010, Page(s):14 - 16
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    A coupled-line-fed ultra-wideband planar antenna with dual band-notched characteristics is proposed. Narrow frequency band notching at 3.5 and 5.5 GHz is achieved using bent resonators coupled to the main feedline. Moreover, the two notched bands can be controlled independently. The proposed antenna design is tested using two independent full-wave solvers. View full abstract»

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  • DSP-PML algorithm for open region DNG meta-material FDTD simulations

    Publication Year: 2010, Page(s):16 - 18
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (126 KB)

    The digital signal processing (DSP) algorithms developed for digital filters and the perfectly matched layer (PML) formulations are incorporated with the finite difference time domain (FDTD) method to model open region double-negative (DNG) meta-material electromagnetic problems. In the proposed approach, the dielectric parameters of each FDTD unit cell are interpreted as an infinite impulse respo... View full abstract»

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  • Electrically tunable rectangular microstrip antenna

    Publication Year: 2010, Page(s):18 - 19
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (158 KB)

    The tunable microstrip patch antenna using electrostatic force is presented. The antenna was patterned on the top side of a (poly-ethylene terephthalte) film. When a DC bias voltage is applied between the flexible patch and the fixed ground plane, the flexible patch bends downwards towards the fixed ground plane owing to the electrostatic force of attraction. The bending of the flexible patch decr... View full abstract»

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  • Folded-type rectangular loop antenna with tunable circuit

    Publication Year: 2010, Page(s):19 - 21
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (447 KB)

    A design for a small and tunable loop antenna is presented. This design enables the higher-order mode resonant frequency to become low while keeping the radiation pattern in good shape. The use of a tunable circuit to utilise higher-order mode for bandwidth enhancement has been investigated. The measured and simulated radiation patterns and voltage standing wave ratio are given. View full abstract»

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  • Miniature multiband monopole antenna for WWAN operation in laptop computer

    Publication Year: 2010, Page(s):21 - 23
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    A novel miniature planar monopole antenna with multiband operation for penta-band wireless wide area network (WWAN) applications is presented. The antenna fabricated on a ceramic substrate consists of a tuning strip and two distinct pairs of driven and coupled strips, and occupies a compact size of only 83(L)??6(W)??0.8(H)??mm3 to be easily embedded inside the laptop computer as an internal antenn... View full abstract»

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  • Switched WLAN-wideband tapered slot antenna

    Publication Year: 2010, Page(s):23 - 24
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (175 KB)

    A switched band antenna that has a capability to operate in dual-band WLAN mode (2.4-2.485 GHz and 5.725-5.875 GHz), a single band WLAN mode of 2.4-2.485 GHz and a wideband mode (2.2-7.2 GHz) is presented. The antenna is based on a tapered slot antenna, which has a defected ground structure containing two switchable ring and two rectangular slots to provide a switched band property. Measurement re... View full abstract»

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  • Wideband unidirectional patch antenna with Γ-shaped strip feed

    Publication Year: 2010, Page(s):24 - 26
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (549 KB)

    A wideband unidirectional patch antenna composed of a shorted bowtie dipole with Γ-shaped feed and an L-shaped electric dipole is designed. It achieves an impedance bandwidth of 87% for VSWR ≤ 2 in the range 2.2-5.6 GHz, stable peak gain of around 7 dBi, unidirectional radiation patterns and low cross-polarisation over the whole operating band. It is sufficient for accommodating rece... View full abstract»

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  • Efficient preprocessing technique for real-time lossless EEG compression

    Publication Year: 2010, Page(s):26 - 27
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (126 KB)

    An efficient preprocessing technique of arranging an electroencephalogram (EEG) signal in matrix form is proposed for real-time lossless EEG compression. The compression algorithm consists of an integer lifting wavelet transform as the decorrelator with set partitioning in hierarchical trees as the source coder. Experimental results show that the preprocessed EEG signal gave improved rate-distorti... View full abstract»

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  • High axial resolution swept source for optical coherence tomography

    Publication Year: 2010, Page(s):28 - 29
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    A high resolution simple swept source for OCT measurements is presented. Low skew frequency domain triggering via electronic processing allowed resolutions of one FFT bin for a single reflection. The high resolution capability was demonstrated in a system containing ~10 ??m spaced interfaces. View full abstract»

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  • Fully-integrated wideband CMOS VCO with improved fV linearity and low tuning sensitivity

    Publication Year: 2010, Page(s):29 - 30
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    A technique to improve the linearity of the frequency-voltage (f - V) characteristic and to reduce the differential tuning sensitivity, KVCO, of voltage-controlled oscillators (VCOs) is proposed. The VCO designed using the linearisation technique is tunable from 806 to 1113 MHz with a 34 tuning range and exhibits a nearly constant KVCO of 62 MHz/V over the entire frequency range. View full abstract»

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  • Full range voltage-controlled ring oscillator in 0.18μm CMOS for low-voltage operation

    Publication Year: 2010, Page(s):30 - 32
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (426 KB)

    A new differential delay cell with a complementary current control to increase the control voltage range as well as the operation frequency is proposed for low-voltage operation. The new differential delay cell is employed in a four-stage voltage-controlled ring oscillator (VCRO). The VCRO is implemented using 0.18 m 1P6M CMOS process and 1.8 V supply voltage. Measured results show that a wide ope... View full abstract»

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  • Interleaved data weighted averaging technique for speed/power relaxation in multi-bit DACs

    Publication Year: 2010, Page(s):32 - 33
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (127 KB)

    Multi-bit delta-sigma (????) modulators suffer from the nonlinearity of feedback digital-analogue converters (DACs) caused by component mismatch. Traditional dynamic element matching techniques are limited in speed owing to the feedback delay. The proposed interleaved data weighted averaging (I-DWA) technique relaxes this speed requirement and therefore allows either a higher bandwidth or improved... View full abstract»

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  • Linearised charge pump independent of current mismatch through timing rearrangement

    Publication Year: 2010, Page(s):33 - 34
    Cited by:  Papers (1)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    In conventional fractional N phase-locked loops (PLLs), charge pump nonlinearity dominates the overall loop linearity. A nonlinear charge pump increases close-in phase noise and fractional spur. Charge pump nonlinearity is mainly caused by up and down current mismatch which is in turn caused by device mismatch, and finite output impedance. A new charge pump linearisation technique is propos... View full abstract»

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  • Minimum component high frequency Gm-C wavelet filters based on Maclaurin series and multiple loop feedback

    Publication Year: 2010, Page(s):34 - 36
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    A minimum component high frequency Gm-C wavelet filter structure is presented. A simple function from Maclaurin series approximation is used and the current-mode follow-the-leader feedback structure is employed. For the seventh-order Marr wavelet bandpass filter, the proposed implementation architecture contains only seven ideal Gm-C integrators for poles and one transconductor for zeros. A 100 MH... View full abstract»

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  • On-chip characterisation of RF systems based on envelope response analysis

    Publication Year: 2010, Page(s):36 - 38
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (107 KB)

    A simple on-chip procedure for testing embedded RF blocks is presented. It is based on the detection and spectral analysis of the two-tone response envelope of the device under test (DUT). A main difference with similar methods is its inherent simplicity, avoiding a preprocessing stage and resorting to simpler circuitry to process the envelope. As a consequence, the main nonlinearity specification... View full abstract»

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  • Increasing peak-field generation efficiency of reverberation chamber

    Publication Year: 2010, Page(s):38 - 39
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (101 KB)

    The use of time-reversal techniques has been shown to allow focusing energy in a spot about half a wavelength wide. The fact of being able to concentrate energy into a reduced volume of space implies higher power densities and, ultimately, higher field levels. The use of this feature for improving the ability of a reverberation chamber in converting energy into high-intensity fields is investigate... 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