By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 31
• ### Fractional-order Wien-bridge oscillator

Publication Year: 2001, Page(s):1110 - 1112
Cited by:  Papers (15)
| | PDF (347 KB)

The classical Wien-bridge sinusoidal oscillator is studied, when both of the capacitors of the oscillator acquire a fractional order. Accordingly, the Wien oscillator is described by a set of fractional-order nonlinear differential equations. It is shown that sinusoidal oscillations are preserved but the phase-shift between the waveforms of the two state variables and the frequency of oscillation ... View full abstract»

• ### 12 nm FWHM 20 dB stop-band filter based on cascaded dual concentric core fibre filters

Publication Year: 2001, Page(s):1113 - 1115
Cited by:  Papers (1)
| | PDF (320 KB)

A spectral stop-band filter with peak attenuation = 5 dB, full width at half-maximum (FWHM) = 31 nm based on a dual asymmetric concentric core optical fibre is investigated. An efficient 12 nm FWHM 20 dB peak attenuation is demonstrated at 1300 nm by cascading four filters View full abstract»

• ### Phase interpolation direct digital synthesiser with precise delay generator using two-step integration

Publication Year: 2001, Page(s):1112 - 1113
Cited by:  Papers (1)  |  Patents (2)
| | PDF (224 KB)

A new delay generator using two-step integration is proposed for direct digital synthesis. The new delay generator can provide precise delay timing since delay timing is unaffected by the propagation delay dispersion of the voltage comparator. Experimental results show that the frequency synthesiser operated successfully View full abstract»

• ### RF and microwave phase shifter using complementary bias techniques

Publication Year: 2001, Page(s):1124 - 1125
Cited by:  Papers (1)  |  Patents (1)
| | PDF (216 KB)

A novel method for the design of an RF phase shifter using a standard foundry process is described. This phase shift achieves very low and near-constant insertion loss. The proposed method uses complementary' control techniques to keep variable parasitic resistance in a standard transistor to a minimum. Using an only single stage reflection configuration which employs N varactor diodes as a refle... View full abstract»

• ### Wide tuning range and low operating power AWG-based thermo-optic wavelength tunable filter using polymer waveguides

Publication Year: 2001, Page(s):1130 - 1132
Cited by:  Papers (5)  |  Patents (1)
| | PDF (344 KB)

Two types of polymer thermo-optic wavelength tunable filter (TOWTF) have been developed, each with a pair of triangular phase shifters. One filter is designed for a large-scale WDM system (32 channels, 0.8 nm spacing), the other for a small-scale WDM system (10 channels, 0.8 nm spacing). The arrayed waveguide number is optimised thus reducing the operating power required by the filters. Moreover, ... View full abstract»

• ### Dual-polarised wideband microstrip antenna

Publication Year: 2001, Page(s):1106 - 1107
Cited by:  Papers (8)
| | PDF (232 KB)

A dual-polarised aperture-coupled microstrip antenna with a wide bandwidth, a high isolation, low cross-polarisation levels and low backward radiation levels is presented. The square patch is fed at two corners via H-shaped apertures. The measured return loss exhibits a bandwidth of over 24.4% and the isolation is better than 30 dB over the bandwidth. The cross-polarisation levels and the front-to... View full abstract»

• ### Jacketed air-clad cladding pumped ytterbium-doped fibre laser with wide tuning range

Publication Year: 2001, Page(s):1116 - 1117
Cited by:  Papers (10)  |  Patents (8)
| | PDF (248 KB)

A tunable cladding-pumped ytterbium-doped fibre laser is presented. An air-clad inner cladding supported by a micro-structured silica mesh inside a silica jacket is used. A measured inner-cladding NA of 0.4 to 0.5 enables efficient pump launch into a 36 μm-diameter inner cladding. The small inner cladding area enables tuning from 1010 to 1120 nm View full abstract»

• ### Design of Weaver topology

Publication Year: 2001, Page(s):1133 - 1135
Cited by:  Papers (3)
| | PDF (312 KB)

A novel design based on Weaver topology is proposed. Studies showed that the image-rejection ratio (IRR) performance of the design is insensitive to the phase errors of the LO1 and the IRR against gain mismatch is inherently about 6 dB superior to the conventional Weaver topology. The design greatly increases the practicality of the Weaver receiver View full abstract»

• ### Stacked shorted patch antenna with tilted parasitic radiator

Publication Year: 2001, Page(s):1109 - 1110
Cited by:  Papers (7)
| | PDF (224 KB)

A new compact but wideband patch antenna is presented. Compact dimensions are obtained by using a shorted patch. The antenna bandwidth is increased by using a stacked patch configuration. Further increase in bandwidth is obtained by tilting the parasitic patch. The antenna prototype is fabricated and its input impedance and radiation patterns are measured View full abstract»

• ### Electrically pumped lasing from CdSe quantum dots

Publication Year: 2001, Page(s):1119 - 1120
Cited by:  Papers (1)  |  Patents (2)
| | PDF (280 KB)

Fabrication of a ZnSe-based laser diode which employs a fivefold CdSe quantum dot stack separated by ZnSSe spacer layers of high S content is reported. For the first time, electrically pumped room-temperature lasing from such quantum dots was obtained at a wavelength around 560.5 nm. The threshold current density is 7.5 kA/cm 2 View full abstract»

• ### Photoimageable thick-film millimetre-wave metal-pipe rectangular waveguides

Publication Year: 2001, Page(s):1122 - 1123
Cited by:  Papers (23)
| | PDF (264 KB)

A novel dielectric-filled metal-pipe rectangular waveguide has been fabricated using photoimageable thick-film materials. The waveguides incorporate a new transition from CPW-to-TFMS-to-MPRWG. Standard on-wafer measurement techniques, waveguide STD calibration standards, demonstrated low attenuation across the 60 to 90 GHz frequency range View full abstract»

• ### Optical cross-connect structures for interleaved multiwavelength bidirectional ring networks

Publication Year: 2001, Page(s):1129 - 1130
Cited by:  Papers (3)
| | PDF (256 KB)

Novel bidirectional optical cross-connect structures using a single arrayed waveguide grating router and tunable fibre Bragg gratings have been proposed for interleaved multiwavelength ring networks. In the proposed structures, each wavelength channel is independently switched by tuning the centre wavelength of the gratings. The feasibility of the cross-connectors has been experimentally demonstra... View full abstract»

• ### Cross-shaped dielectric resonator antenna analysis using conformal finite difference time domain method

Publication Year: 2001, Page(s):1105 - 1106
| | PDF (256 KB)

A cross-shaped dielectric resonator antenna, designed for circular polarisation, is analysed via the conformal finite difference time domain technique. The conformal technique, which can handle canted surfaces that do not conform to the Cartesian system of co-ordinates, is used to generate accurate results with a relatively coarse mesh, e.g. it is shown that the conformal FDTD offers a 2:1 advanta... View full abstract»

• ### Recognition confidence scoring using recognition results from perturbed input feature vectors

Publication Year: 2001, Page(s):1143 - 1145
| | PDF (344 KB)

New information to score confidence for out-of-vocabulary (OOV) rejection is introduced. Using recognition results from perturbed input feature vectors, additional information is attained and then combined with a conventional method. Simulation results show that the information can be effectively used for improving OOV rejection performance View full abstract»

• ### Active modelocking of miniature fibre Fabry-Perot laser in ring cavity

Publication Year: 2001, Page(s):1115 - 1116
| | PDF (240 KB)

Active modelocking at 10 GHz of a 10 mm-long fibre Fabry-Perot laser in a ring cavity is demonstrated. Very stable pulse trains without supermode noise were obtained. The pulsewidth was ~10 ps, which could be shortened to 1.6 ps by insertion of highly-nonlinear fibre View full abstract»

• ### Density evolution for low-density parity-check codes under Max-Log-MAP decoding

Publication Year: 2001, Page(s):1125 - 1126
Cited by:  Papers (10)  |  Patents (2)
| | PDF (208 KB)

A density evolution procedure for low-density parity-check (LDPC) codes under Max-Log-MAP decoding is presented. Using this technique, the precise convergence threshold for LDPC code could be easily derived View full abstract»

• ### Performance of spatial smoothing algorithms for radar signature modelling

Publication Year: 2001, Page(s):1132 - 1133
| | PDF (232 KB)

In the area of radar signature modelling, subspace-based methods have recently become very popular. To model radar signals using subspace-based methods, spatial-smoothing preprocessing (SSP) is essential to estimate the covariance matrix of the received signals. Here, the performances of two typical SSP techniques are compared in the context of radar signature modelling View full abstract»

• ### Monolithically integrated Yagi-Uda antenna for photonic emitter operating at 120 GHz

Publication Year: 2001, Page(s):1107 - 1109
Cited by:  Papers (4)  |  Patents (2)
| | PDF (320 KB)

A monolithically integrated photonic emitter using a uniplanar Yagi-Uda antenna is presented. By integrating a uni-travelling-carrier photodiode with the antenna, an emission of millimetre-wave signals with a power of 0.1 mW at the frequency of 120 GHz has been demonstrated experimentally View full abstract»

• ### Cryptanalysis of cryptosystem due to Yoo, Hong, Lee, Lim, Yi and Sung

Publication Year: 2001, Page(s):1118 - 1119
| | PDF (280 KB)

The authors show that a public key cryptosystem due to Yoo, Hong, Lee, Lim, Yi and Sung is insecure, as it is susceptible to an attack based on the LLL algorithm View full abstract»

• ### Frame size adaptation for indoor wireless networks

Publication Year: 2001, Page(s):1135 - 1136
Cited by:  Papers (10)
| | PDF (248 KB)

An optimal frame size predictor for indoor wireless networks is proposed and studied. Kalman filtering is employed to predict the optimal frame size in order to obtain a guaranteed channel utilisation. Through simulation, it is shown that the proposed algorithm can substantially lower the estimation error View full abstract»

• ### Performance evaluation of BLAST-OFDM enhanced Hiperlan/2 using simulated and measured channel data

Publication Year: 2001, Page(s):1137 - 1139
Cited by:  Papers (27)  |  Patents (1)
| | PDF (304 KB)

The performance benefits of spatial multiplexing are evaluated for an otherwise unmodified Hiperlan/2 physical layer. To obtain an upper bound' result, full complexity ML decoding of the V-BLAST OFDM signal is performed. Performance results using statistical multi-element channel models are compared with those using state-of-the-art MIMO channel measurements View full abstract»

• ### Efficient and flexible laser ultrasound generation using spatial light modulators

Publication Year: 2001, Page(s):1145 - 1146
| | PDF (176 KB)

Efficient production of surface acoustic waves using optical distributions controlled by spatial light modulators is demonstrated. The measurements presented used only 40 mW average optical power on the sample surface. It is shown that a spatial light modulator produces light distributions which control the surface acoustic wave generation on the sample surface; this can be used to produce similar... View full abstract»

• ### One-pass training of optimal architecture auto-associative neural network for detecting ectopic beats

Publication Year: 2001, Page(s):1126 - 1127
Cited by:  Papers (12)
| | PDF (240 KB)

The authors have previously described a method for ectopic beat detection in the electrocardiogram using an auto-associative neural network. Here they present a method that utilises principal component analysis to optimise the complexity of the neural network and uses singular value decomposition to determine the initial values for the weights View full abstract»

• ### Maximum likelihood differentiation between static and mobile users in cellular systems

Publication Year: 2001, Page(s):1136 - 1137
| | PDF (208 KB)

A method for the classification of cellular users as being either static or mobile is presented. This information is extracted from the variation of averaged signal strength measurement reports by means of a very low complexity algorithm involving maximum likelihood Gaussian estimation. Simulation results are very encouraging, suggesting an estimation accuracy from 80 to 95% View full abstract»

• ### Coaxially-fed tapered slot antenna

Publication Year: 2001, Page(s):1103 - 1104
Cited by:  Papers (9)
| | PDF (232 KB)

An improved design of the longitudinal tapered slot antenna is presented which incorporates a tapered coaxial line balun. This transformer type offers large bandwidth, allows for the direct connection of coaxial sources and reduces the complexity of the printed circuit. Experimental results for an antenna prototype are presented View full abstract»

## 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