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Electronics Letters

Issue 24 • Date November 20 2008

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Displaying Results 1 - 25 of 31
  • Bidirectional radiated circularly polarised square-ring antenna for portable RFID reader

    Publication Year: 2008 , Page(s): 1383 - 1384
    Cited by:  Papers (15)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (182 KB)  

    A novel single-layer, dual-fed technique for a bidirectional radiated circularly polarised square-ring antenna operated in the UHF band is presented. The two feed ports of the square-ring radiating element are placed in orthogonal directions and connected to a feeding network with a Wilkinson power divider in the same plane. Properly adjusting the size of the capacitive coupling groundplane results in good impedance matching and circularly polarised radiation, and a broad impedance bandwidth (S 11 les -10 dB) of about 45.2% and a 3 dB axial-ratio bandwidth of about 8.7% were obtained. View full abstract»

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  • Conforming arbitrary order hexahedral/tetrahedral hybrid discretisation

    Publication Year: 2008 , Page(s): 1384 - 1385
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (121 KB)  

    A new method for constructing H(curl) or H(div) conforming hexahedral/tetrahedral hybrid meshes of arbitrary discretisation order is presented. Tetrahedral elements that conform directly to hexahedral elements are constructed, avoiding the need for pyramidal or other joining element types. The effectiveness of this method is investigated in a finite-element framework, and some caveats pertaining to higher-order pyramidal elements are raised. View full abstract»

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  • Double-loop antenna for wireless tyre pressure monitoring

    Publication Year: 2008 , Page(s): 1385 - 1386
    Cited by:  Papers (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (162 KB)  

    The design of a double-loop antenna operating at two distinct frequencies is presented for wireless tyre pressure monitoring systems. The radiation properties of the printed antenna, placed inside the wheel and with the tyre rubber, are discussed as well as the performance in terms of gain and power handling. View full abstract»

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  • Implementation and investigation of U-shaped aperture UWB antenna with dual band-notched characteristics

    Publication Year: 2008 , Page(s): 1387 - 1388
    Cited by:  Papers (22)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (238 KB)  

    The design and analysis of an ultra-wideband (UWB) aperture antenna with dual band-notched characteristics are presented. The antenna consists of a circular exciting stub on the front side and a U-shaped aperture on the back ground plane. By inserting a slot and a parasitic strip to the antenna, dual notched frequency bands are achieved. A conceptual circuit model, which is based on the measured impedance of the proposed antenna, is also shown to investigate the dual band-notched characteristics. The measured impedance bandwidth defined by VSWR<2 of 9.0 GHz (2.2-11.2 GHz), with the dual bands of 3.25-4.25 and 5.0-6.05 GHz notched, is obtained. View full abstract»

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  • Short-circuited feed terminations on beam steering square loop antennas

    Publication Year: 2008 , Page(s): 1389 - 1390
    Cited by:  Papers (13)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    Theoretical and experimental investigations of a beam steerable square loop antenna (SLA), including a four-port practical feeding mechanism, is presented. Exciting one of the feeds and short-circuiting the other three results in a linearly polarised beam tilted up from the ground plane and directed away from the active feed. Thus, by exciting one feed at a time, the antenna steers the beam in four different quadrants. A qualitative explanation of the radiation characteristics is also presented using the current distribution. The SLA is designed to operate at 4.5 GHz and has a gain of 6.7 dBi. View full abstract»

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  • Fully-differential self-biased bio-potential amplifier

    Publication Year: 2008 , Page(s): 1390 - 1391
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (231 KB)  

    A highly versatile and programmable bio-potential recording amplifier is presented. The amplifier achieves low-power operation with minimal size by using a fully-differential self-biased operational amplifier and the Miller capacitance technique. The experimental results of recording various biological signals are provided. View full abstract»

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  • Plasmonic terahertz detectors for biodetection

    Publication Year: 2008 , Page(s): 1391 - 1392
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (191 KB)  

    A report is presented on the biodetection capabilities of plasmonic terahertz detectors. Large changes in the terahertz response of plasmonic detectors loaded with solutions of globulin-free bovine serum albumin, arginine and heparin were measured for concentrations that did affect the device transfer characteristics. The consistent change of the response characteristics with specimen type and concentration can be used to identify and quantify biological and chemical substances. The device structure makes it suitable for use as a building block of a biochip with integrated processing capabilities. View full abstract»

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  • Ring sensor and heart rate monitoring system for sensor network applications

    Publication Year: 2008 , Page(s): 1393 - 1394
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (213 KB)  

    A ring-type pulse oximeter sensor attached to the finger and its 24-hour ambulatory heart rate monitoring system are presented. The PCB has been designed with a light-to-frequency converter and the CPU with a built-in Zigbee stack for simple and low power consumption. Also designed is the algorithm using a least square estimator to calibrate various signal distortions caused by motion artefacts for a proper accuracy. View full abstract»

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  • Fast CABAC decoding architecture

    Publication Year: 2008 , Page(s): 1394 - 1395
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (178 KB)  

    A novel high-performance decoding architecture for H.264 context-based adaptive binary arithmetic coding (CABAC) is presented, where several efficient techniques such as speculative decoding, table-based calculation, logic balancing, mathematic reordering and optimal retiming are adopted to reduce the critical timing path. Simulation and implementation results show that the architecture can achieve a fixed decoding rate of up to 247.5 Mbit/s, which is 67 faster than conventional architectures. View full abstract»

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  • Highly efficient PWM strategy over FPGA

    Publication Year: 2008 , Page(s): 1396 - 1397
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (181 KB)  

    A novel pulse-width-modulation (PWM) technique, based on linear functions that are easy to implement over FPGA and take up little hardware resources, is presented. The technique generates high-quality voltages with very few commutations per cycle and is highly efficient in reducing commutation loss. It has been implemented, tested and compared to other PWM techniques and results show that it yields a better quality signal with only a quarter of commutations per cycle. View full abstract»

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  • Bragg gratings written in multimode borosilicate fibres using ultrafast infrared radiation and phase mask

    Publication Year: 2008 , Page(s): 1398 - 1399
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (113 KB)  

    Inscription of Bragg grating structures is reported for the first time in multimode borosilicate fibres using femtosecond pulse duration 800 nm infrared radiation and a phase mask. Thermal annealing of the gratings up to 700degC reveals a behaviour similar to type I-IR gratings made in silica fibre with ultrafast infrared radiation. View full abstract»

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  • Technique for correcting systematic phase errors during fibre Bragg grating inscription

    Publication Year: 2008 , Page(s): 1399 - 1400
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (196 KB)  

    A simple technique for correcting systematic phase errors introduced during the holographic inscription of fibre Bragg gratings is presented. The technique involves characterising the fabrication errors associated with the phase mask and writing medium (i.e. the fibre). This is accomplished by measuring the phase of the coupling coefficient of a weak, uniform dasiatrace gratingdasia written in the fibre. This phase is then used to generate a phase-corrected profile by combining the inverse of the measured phase with the phase of a target gratingdasias profile. The trace grating is then overwritten with the stronger phase-corrected grating. Using this technique, a dual phase-shifted grating has been fabricated successfully and the overall phase error in reduced by a factor of 13. View full abstract»

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  • Tri-tracking method for robust object tracking

    Publication Year: 2008 , Page(s): 1401 - 1402
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (248 KB)  

    A novel tri-tracking method for tracking objects is proposed. The tracker trains three support vector machines with labelled frames, in which an object is represented using three independent feature histograms. Based on the confidence map created by each classifier, the object position is given by the mean shift. Experiments on several video sequences show the robustness and accuracy of the proposed method. View full abstract»

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  • 6.1 GHz 4.6 mW CMOS divide-by-55/56 prescaler

    Publication Year: 2008 , Page(s): 1402 - 1403
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (175 KB)  

    A divide-by-55/56 phase switching prescaler based on odd phase signals is proposed. The odd phase signals for phase switching are generated by a divide-by-7 injection-locked frequency divider. A simple topology with a high operating frequency and a low power consumption is obtained. Implemented with a standard 0.18 m CMOS process, the prescaler is able to work from 3.2 to 6.1 GHz with a maximum measured power consumption of 4.6 mW from a 1.8 V supply voltage. View full abstract»

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  • CMOS multiband low-noise amplifier using inner diameter shared inductors

    Publication Year: 2008 , Page(s): 1404 - 1405
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (238 KB)  

    A new integrated inductor structure suitable for multiband application is proposed and used to implement a CMOS multiband low-noise amplifier. Its occupied silicon area can be decreased by more than 40% while its performance is almost the same as those of LNAs using the conventional inductor structure. It is fabricated in a 0.13%%m CMOS process and its measured results show gains of 16.8, 15.8 and 15.5%dB, with NFs of 1.4, 1.8 and 1.9%dB, and IIP3 of 4, 0 and %2%dBm for the 850, 1800/1900 and 2100%MHz bands, respectively. View full abstract»

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  • Dual tunable thin-film ferrite-ferroelectric slotline resonator

    Publication Year: 2008 , Page(s): 1406 - 1407
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (145 KB)  

    A novel microwave resonator of yttrium iron garnet and ferroelectric barium strontium titanate films in a slotline structure is proposed. The resonator is electric field tunable, by 75 MHz for E 5 V/ m applied to the slotline electrodes, and has several advantages: (i) a low cutoff frequency of a few megahertz compared with several gigahertz for open-dielectric waveguides, and (ii) a high degree of hybridisation of magnetostatic surface spin waves and electromagnetic modes that results in excellent tunability. View full abstract»

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  • Dual-frequency power divider with isolation stubs

    Publication Year: 2008 , Page(s): 1407 - 1408
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (200 KB)  

    A novel dual-frequency power divider with isolation stubs is presented. To reduce the parasitic effects between the two stubs that are connected by the isolation resistor in traditional Wilkinson power dividers, a structure consisting of isolation stubs is proposed. The corresponding design equations are obtained to calculate the design parameters of the desired dual-frequency power divider. Finally, this design concept is validated by experimental results on a 0.95/2.09 GHz dual-frequency power divider. View full abstract»

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  • High efficiency microwave rectenna circuit: modelling and design

    Publication Year: 2008 , Page(s): 1409 - 1410
    Cited by:  Papers (14)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (205 KB)  

    An equivalent circuit approach used for the modelling of a system consisting of an antenna and an RF/DC rectifying circuit (rectenna) is presented. It is shown that using this approach, no electromagnetic simulation tool is required for the simulation and optimisation of the overall circuit. The realised rectenna operates at 2.45 GHz, and shows very good agreement between the predicted efficiency using the presented model (about 75 ) and the measured one. View full abstract»

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  • Miniaturised microstrip bandpass filter using octagonal hairpin resonators with side-coupled technique

    Publication Year: 2008 , Page(s): 1410 - 1411
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (237 KB)  

    A miniaturised elliptic-function-response bandpass filter using octagonal double-hairpin-shape resonators with side-coupled stubs has been designed and fabricated. Measured results are in good agreement with the electromagnetic simulation results and verify that the central frequency and the passband range of the proposed filter are 968 and 950-990-MHz, respectively. Also, its electric coupling characteristics and field distributions are investigated. The circuit size of the proposed filter occupies only 22.6-14.3-mm (-0.13-gtimes0.085timesg). View full abstract»

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  • Methodology to design advanced MR-IR-UWB communication system

    Publication Year: 2008 , Page(s): 1412 - 1413
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (142 KB)  

    A new model is proposed giving the channel capability of a multiband impulse radio ultra-wideband (MB-IR-UWB) system against the number of subband and the duty cycle. The architecture simulated shows a data rate ranging from 1434-0.9 Gbits/s for 16-10 subbands and a duty cycle ranging from 20-12%. View full abstract»

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  • Performance analysis of partially coherent SSD systems

    Publication Year: 2008 , Page(s): 1414 - 1415
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (128 KB)  

    The performance analysis of a system employing co-ordinate interleaving and constellation rotation, over Nakagami-m fading channels, in the presence of phase noise as well as additive white Gaussian noise, is presented. An upper bound for the average probability of bit error for M-ary phase shift keying is derived. It is shown that the derived upper bound is tight for high signal-to-noise ratios and in the presence of phase noise the optimum rotation angle does not change. Furthermore, it is shown that a system employing co-ordinate interleaving and constellation rotation is more robust against phase estimation errors. View full abstract»

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  • High coded data rate and multicodeword WiMAX LDPC decoding on Cell/BE

    Publication Year: 2008 , Page(s): 1415 - 1416
    Cited by:  Papers (7)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (129 KB)  

    A novel, flexible and scalable parallel LDPC decoding approach for the WiMAX wireless broadband standard (IEEE 802.16e) in the multicore Cell broadband engine architecture is proposed. A multicodeword LDPC decoder performing the simultaneous decoding of 96 codewords is presented. The coded data rate achieved a range of 72-80-Mbit/s, which compares well with VLSI-based decoders and is superior to the maximum coded data rate required by the WiMAX standard performing in worst case conditions. The 8-bit precision arithmetic adopted shows additional advantages over traditional 6-bit precision dedicated VLSI-based solutions, allowing better error floors and BER performance. View full abstract»

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  • 1 Tbit/s (111 Gbit/s/ch X 10 ch) no-guard-interval CO-OFDM transmission over 2100 km DSF

    Publication Year: 2008 , Page(s): 1417 - 1418
    Cited by:  Papers (6)  |  Patents (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (175 KB)  

    Spectrally efficient (2 bit/s/Hz) 1 Tbit/s DWDM transmission of 111 Gbit/s no-guard-interval PDM CO-OFDM signals with 50 GHz spacing over DSF is demonstrated. The record transmission distance of 2100 km was achieved for a 100 Gbit/s-data-rate CO-OFDM system. View full abstract»

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  • Measurement and modelling of high-linearity partially depleted absorber photodiode

    Publication Year: 2008 , Page(s): 1419 - 1420
    Cited by:  Papers (5)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (147 KB)  

    Third-order intermodulation distortions of an InGaAs/InP partially depleted absorber photodiode (PDA-PD) using high doping levels for both p-type and n-type absorbers are characterised using a two-tone measurement technique. The third-order local intercept point (IP3) of the device increases only slightly with frequency, and remains as high as 39 dBm up to 20 GHz. The frequency characteristics of the IP3 can be well explained by an equivalent circuit model. View full abstract»

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  • Experimental study of low-voltage surge protection device response in realistic systems

    Publication Year: 2008 , Page(s): 1420 - 1421
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    Experimental results on low-voltage surge protection under fast pulses in realistic wiring systems are presented. A fast voltage pulse generator is designed to provide fast voltage pulses with short steep fronts. The effective residual voltage of protected equipment is then investigated and compared with simulation results. 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