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Current Search:
All of 'Electrical', 'and', 'Computer' and 'Engineering' in all fields;
298 items found
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Displaying Results 226 - 250 of 298 on page 10 of 12
Marked
Mark
All Optical Clock Distribution with Synchronous Frequency Division and Multiplication
(1992)
Farrell, Gerald; Phelan, P.; Hegarty, Joe
All Optical Clock Distribution with Synchronous Frequency Division and Multiplication
(1992)
Farrell, Gerald; Phelan, P.; Hegarty, Joe
Abstract:
<p>A master optical clock from a mode locked laser is distributed to two slave twin section lasers. One slave laser divides the optical modulation frequency by 2, the other slave laser multiplies the frequency by 2. It is also possible to vary the multiplication4ivision ratio in a slave laser using only DC control of the absorber of the twin section laser.</p>
http://arrow.dit.ie/engscheceart/3
Marked
Mark
The Influence of the Unlocked Characteristics of a Self-pulsating Laser Diode on Synchronisation
(1993)
Farrell, Gerald; Phelan, P.; Hegarty, Joe
The Influence of the Unlocked Characteristics of a Self-pulsating Laser Diode on Synchronisation
(1993)
Farrell, Gerald; Phelan, P.; Hegarty, Joe
Abstract:
<p>All-optical synchronization and timing extraction based on self-pulsating twin section lasers has been demonstrated. We investigate the variation of the unlocked full-width at- half-maximum of the fundamental of the RF spectrum of a self-pulsating laser diode. We show for the first time that the value of the unlocked FWHM has a direct influence on the power required to maintain synchronization. We also show that the variation of the FWHM with frequency is dependent on the slope of the absorber bias versus self-pulsation frequency characteristic. The results have important implications for the design and selection of self-pulsating laser diodes for synchronization applications.</p>
http://arrow.dit.ie/engscheceart/8
Marked
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Development of fiber bend loss edge filter
(2008)
Wang, Pengfei, (Thesis)
Development of fiber bend loss edge filter
(2008)
Wang, Pengfei, (Thesis)
Abstract:
<p>This PhD thesis addresses several aspects of macrobending loss in single-mode optical fibers. The context for the work is the development of an edge filter for a rapid wavelength measurement system. Based on scalar approximation theory and the beam propagation method, a simulation platform is developed and used to predict the macrobending loss of singlemode fiber with single or multiple coating layers. A single-mode step index fiber macrobending loss edge filter is investigated theoretically in terms of baseline loss, discrimination range and polarization dependent loss (PDL). The theoretical analysis is supported by a range of experimental investigations and results. The bend loss characteristics of a conventional SMF28 based edge filter are investigated. The bend loss characteristics of a high bend loss fiber based edge filter are also investigated for comparison. It is shown that while the high-bend loss fiber based filter requires significantly fewer bend turns and exhi...
http://arrow.dit.ie/engdoc/17
Marked
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A macro-bend fiber based wavelength demodulation system for optical fiber sensing applications
(2008)
Rajan, Ginu, (Thesis)
A macro-bend fiber based wavelength demodulation system for optical fiber sensing applications
(2008)
Rajan, Ginu, (Thesis)
Abstract:
<p>This thesis considers the design and development of a wide range allfiber interrogation system with a rapid measurement capability for extracting reliable measurand information from fiber Bragg grating sensors. Existing passive and active interrogation systems have certain limitations and do not satisfy all requirements. In this thesis a wavelength demodulation system is proposed, based on a macro-bend fiber filter employed in a ratiometric detection scheme. A theoretical model and analysis of an edge filter based ratiometric wavelength measurement (RWM) system is presented. A fiber edge filter is realized by carefully selecting an appropriate bend radius and number of bend turns of a standard single-mode fiber with an applied absorption layer. The calibration and characterization of the system are carried out experimentally and the effect of the signal-to-noise ratio (SNR) of the source is studied. It is shown that the SNR limits the measurable wavelength range of the syst...
http://arrow.dit.ie/engdoc/16
Marked
Mark
Development of laboratory prototype of a 12kVA digital shunt active filter
(2008)
Jayanti, N. G.; Basu, Malabika; Axente, Iurie; Gaughan, Kevin; Conlon, Michael F.
Development of laboratory prototype of a 12kVA digital shunt active filter
(2008)
Jayanti, N. G.; Basu, Malabika; Axente, Iurie; Gaughan, Kevin; Conlon, Michael F.
Abstract:
The paper reports the development of a laboratory prototype of a fully digital DSP controlled 12 kVA Shunt Active Filter (ShAF) capable of compensating for non-linear, unbalanced load and reactive power. A fully digital controller is implemented for the reference generation and the current control purposes. The delay problem in digital current controller is overcome by application of a fast DSP, a compact controller and proper flow of control steps in the DSP software. A Phase Locked Loop (PLL)-less software grid synchronization method has been proposed for the effective operation of the ShAF under the grid frequency variation. The source current THD has been improved from 15.8% to 4.45%. The control features, experimental setup, and results are presented in the paper.
http://arrow.dit.ie/engscheleart/109
Marked
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Experimental investigation of performance of a single phase UPQC for voltage sensitive and non-linear loads
(2001)
Basu, Malabika; Das, S. P.; Dubey, Gopal K.
Experimental investigation of performance of a single phase UPQC for voltage sensitive and non-linear loads
(2001)
Basu, Malabika; Das, S. P.; Dubey, Gopal K.
Abstract:
A unified power quality conditioner (UPQC) is proposed in this paper. It protects the consumer at the load end from supply voltage sag, and provides unity power factor condition at the utility for different values of load power factor. A PC-based closed loop control scheme is proposed and experimental investigation is carried out in the laboratory. Selected experimental results are reported along with control circuit and phasor diagram to validate the proposition.
http://arrow.dit.ie/engscheleart/108
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Sequence analysis based DSP controller for dynamic voltage restorer (DVR)
(2008)
Jayanti, N. G.; Basu, Malabika; Axente, Iurie; Gaughan, Kevin; Conlon, Michael F.
Sequence analysis based DSP controller for dynamic voltage restorer (DVR)
(2008)
Jayanti, N. G.; Basu, Malabika; Axente, Iurie; Gaughan, Kevin; Conlon, Michael F.
Abstract:
The paper examines the behaviour of a dynamic voltage restorer (DVR) under balanced/unbalanced supply voltage sag condition, and restricted DVR injection capability (e.g. limited to 50% of the supply voltage injection). Sequence components of the supply voltage are extracted to generate the reference injected voltage for the DVR. The control determines the maximum possible positive sequence injection within the capacity of the compensator to achieve balanced voltage conditions at the load terminals. The control is verified through simulation and experimentation. The control algorithm has been implemented in a TI320F2812 fixed point DSP and the effectiveness of the controller is verified in a three-phase, 10kVA DVR laboratory prototype. In a three-phase, 240 V system, balanced sag and sag with magnitude and phase unbalance have been created, which is successfully compensated by the DVR with the proposed controller.
http://arrow.dit.ie/engscheleart/103
Marked
Mark
Onset based audio segmentation for the Irish tin whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Onset based audio segmentation for the Irish tin whistle
(2004)
Gainza, Mikel; Lawlor, Bob; Coyle, Eugene
Abstract:
A technique for segmenting tin whistle audio signals according to the position of the note onsets is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for detecting the instant when a note starts and releases. Musical ornamentation, such as cuts and strikes, are very common in Irish traditional music and are played during the onset stage. Taking advantage of this musical feature, a novel technique for improving the onset time estimation is also presented.
http://arrow.dit.ie/engscheleart/101
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Design of a wireless system for patient-hospital communciation and result validation in point of care testing
(2005)
McGrory, John; Lynch, Owen; Coyle, Eugene
Design of a wireless system for patient-hospital communciation and result validation in point of care testing
(2005)
McGrory, John; Lynch, Owen; Coyle, Eugene
Abstract:
This paper discuses mobile phone (cell phone) and wireless applications for linking patients who manage their healthcare outside the hospital using point of care testing (POCT) to hospital information systems (HIS). Certain medical conditions require patients to manage their healthcare by performing on themselves POC testing and act faithfully on the result. This raises quality control issue, as these POC samples and testing procedures are not independently overseen by professional hospital staff. In hospitals, samples taken by clinicians are validated by hi-tech computerised validation systems to ensure plausibility, before physicians rely on them. Patients in the home must often use results from these POCT to determine medication dosage or to monitor their condition. Thus, there is a need to implement a system of result validation, either locally or by the hospital validation system itself for people testing with POCT devices.
http://arrow.dit.ie/engscheleart/99
Marked
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A wavelet controller for shunt active power filter
(2006)
Basu, Malabika; Basu, Biswajit
A wavelet controller for shunt active power filter
(2006)
Basu, Malabika; Basu, Biswajit
Abstract:
A wavelet-based controller for shunt active power filter (APF) has been proposed in this paper. The constructed controller based on multi resolution analysis has the advantage of better frequency bandwidth selection. The tuning parameters of the controllers are the gains to be applied to the time-frequency signals at different resolutions. This has the advantage of aiding the process of a proper choice of coefficients of tuning parameters. The developed simulation model of the APF with wavelet-based control shows satisfactory steady state and dynamic performance. A comparison with standard PI controller shows that the dynamic response of the proposed wavelet controller is much faster. This is of advantage in specific applications where the fast dynamic response of the controller is of importance to achieve a desired reference within a short duration of time. The novel technique of the generation of control signal ensures that even when the steady state error is zero, the controller ...
http://arrow.dit.ie/engscheleart/98
Marked
Mark
On Surface Currents in a Polycrystalline Solar Cell Acting as Ground Plane for Microstrip Patch Antennas
(2008)
Roo Ons, Maria J.; Shynu, S.V.; Ammann, Max; McCormack, Sarah; Norton, Brian
On Surface Currents in a Polycrystalline Solar Cell Acting as Ground Plane for Microstrip Patch Antennas
(2008)
Roo Ons, Maria J.; Shynu, S.V.; Ammann, Max; McCormack, Sarah; Norton, Brian
Abstract:
<p>The integration of communication devices with photovoltaic (PV) technology leads to the development of autonomous communication systems distinguished by immunity to grid breakdowns and eco-friendliness.</p>
http://arrow.dit.ie/engschececon/46
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Some Techniques to Improve Small Groundplane Printed Monopole Performance
(2007)
Ammann, Max; John, Matthias
Some Techniques to Improve Small Groundplane Printed Monopole Performance
(2007)
Ammann, Max; John, Matthias
Abstract:
<p>Printed planar monopole antennas are enjoying considerable popularity and publicity to their low-profile, wide bandwidth, quasi-omnidirectional radiation characteristics and their ease of integratability into devices. The impedance bandwidth and radiation properties of a strip monopole have been shown to be heavily dependent on groundplane size. The groundplane (GP) is of primary importance and when miniaturised, the antenna properties change significantly. Techniques to improve the performance of printed antennas on small groundplanes are presented.</p>
http://arrow.dit.ie/engschececon/41
Marked
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Performance characterization for patch antenna systems with a limited number of EBG cells using the mushroom-like structure as benchmark.
(2007)
Ruvio, Giuseppe; Ammann, Max
Performance characterization for patch antenna systems with a limited number of EBG cells using the mushroom-like structure as benchmark.
(2007)
Ruvio, Giuseppe; Ammann, Max
Abstract:
The effect of one, two and three lines of EBG mushroom-like cells on the coupling of two different 2-element arrays was analyzed and described. It was demonstrated that a certain surface waves attenuation is already achievable with just one row of cells, even though a better performance is obtained when more lines are added. A bandgap investigation technique based on the analysis of the transmission coefficient of a two-patch antenna array separated by one, two and three lines of EBG cells was used throughout the paper. e analyze two types of antennas (monopole and square patch) both resonating at 15 GHz but with different radiation mechanisms in order to isolate the contribution of the EBG and better understand its effect on different polarized surface waves.
http://arrow.dit.ie/engschececon/39
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1 Gbit/s Radio Over Fiber Downlink at a 32 GHz Carrier
(2008)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Sch...
1 Gbit/s Radio Over Fiber Downlink at a 32 GHz Carrier
(2008)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Schwarzbacher, Andreas
Abstract:
<p>The carrier frequency of the presented radio over fiber downlink at 32 GHz is generated by stimulated Brillouin scattering and an error free 1 Gbit/s data transmission is realized.</p>
http://arrow.dit.ie/engschececon/34
Marked
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Inset-fed Mircrostrip Patch Antenna with Integrated Polycrystalline Photovoltaic Solar Cell
(2007)
Shynu, S.V.; Roo Ons, Maria J.; Ammann, Max; Gallagher, Sarah; Norton, Brian
Inset-fed Mircrostrip Patch Antenna with Integrated Polycrystalline Photovoltaic Solar Cell
(2007)
Shynu, S.V.; Roo Ons, Maria J.; Ammann, Max; Gallagher, Sarah; Norton, Brian
Abstract:
<p>A novel method of integrating microstrip patch antennas and polycrystalline silicon solar cells for application in autonomous communication systems is presented. The DC and RF functions are intimately linked, by using the silver DC bus bars of the solar cell as the ground plane of the microstrip patch. The performance of the solar antenna is compared with standard microstrip patch. Detailed studies of the effect of the solar cell on the microstrip antenna are then carried out. The effects of solar cell integration, DC loading and variation in incident photon intensity of the silicon layer on the performance of the solar antenna are discussed. The optimum orientation of the silver DC bus bars on the solar cell in order to achieve better antenna gain and radiation performance is also studied in detail.</p>
http://arrow.dit.ie/engschececon/32
Marked
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Investigation on Proximity-coupled Microstrip Integrated PV Antenna
(2007)
Roo Ons, Maria; Shynu, S.V.; Ammann, Max; McCormack, S.; Norton, Brian
Investigation on Proximity-coupled Microstrip Integrated PV Antenna
(2007)
Roo Ons, Maria; Shynu, S.V.; Ammann, Max; McCormack, S.; Norton, Brian
Abstract:
<p>The use of polycrystalline silicon solar cells (156 times156 mm) as a groundplane for a proximity-coupled microstrip square patch antenna (30 times 30 mm) is investigated. Four different models that arise from the different possible positions of the cell with respect to patch, were simulated, fabricated and compared to an ideal PEC ground plane antenna of the same size. It was found that the use of the solar cell as ground plane is feasible, yielding similar impedance bandwidth (around 4%, 3.5% for the PEC) with reasonable gain. The feasibility of using poly-crystalline solar cells as a ground plane, instead of a PEC is examined for proximity coupled patch antennas.</p>
http://arrow.dit.ie/engschececon/30
Marked
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Investigation on Annular-ring Patch Antenna with EBG Structure
(2006)
Bao, Xiulong; Ruvio, Giuseppe; Ammann, Max
Investigation on Annular-ring Patch Antenna with EBG Structure
(2006)
Bao, Xiulong; Ruvio, Giuseppe; Ammann, Max
Abstract:
<p>An annular-ring loaded circular patch antenna with slot-ring array of EBG cells on the ground plane is presented. A comparison is made between the annular ring loaded patch on a conventional PEC groundplane and the same patch on a groundplane with a 2x2, a 4x4 and a 6x6 slot-ring EBG array. It was found that the annular-ring patch antenna with a 4 x 4 slot-ring array in the ground plane is superior in the overall performance (gain, impedance and axial-ratio bandwidth). The array of EBG was found to improve gain by 3.5dB and increase the bandwidth of input impedance by about 60% (from 56MHz to 85MHz) and the bandwidth of axial ratio increased by about 70% (from 14MHz to 24MHz).</p>
http://arrow.dit.ie/engschececon/28
Marked
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Low-profile Rolled Planar Antenna with Wide Bandwidth
(2007)
Ruvio, Giuseppe; Ammann, Max
Low-profile Rolled Planar Antenna with Wide Bandwidth
(2007)
Ruvio, Giuseppe; Ammann, Max
Abstract:
<p>A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained without excessively perturbing its radiation properties. The proposed antenna is capable of covering frequencies in the range 3.1 GHz to 15 GHz. The antenna yields a high gain with high radiation efficiency across the full bandwidth. Radiation patterns show good omnidirectional features, so it is a remarkable candidate for in-door or vehicular applications where large frequency range is required</p>
http://arrow.dit.ie/engschececon/26
Marked
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Miniaturized Annular Ring Loaded Patch Antennas
(2007)
Ammann, Max; Bao, Xiulong
Miniaturized Annular Ring Loaded Patch Antennas
(2007)
Ammann, Max; Bao, Xiulong
Abstract:
<p>The proliferation of wireless communication systems has promoted the development of miniaturized antenna designs. Annular ring patch antennas are reported to reduce antenna size. In this paper, several novel compact probe-fed annular-ring microstrip patch antennas are presented. In order to reduce the antenna size and provide a suitable input impedance match, two techniques are employed; the insertion of strips into the annular ring and placing a cross-slot into the ground plane. The proposed annular-ring patch antennas with a cross-slotted ground plane yield a much smaller size for a given frequency and are easily matched to 50 Ohms. These novel patch antennas can effectively be reduced by about 55 percent in size compared to conventional annular-ring patch antennas. The antenna can be designed for single band circular-polarization, dual-band circular polarization, triple band, or wideband operation, depending on parameter selection. Some significant advantages are evident...
http://arrow.dit.ie/engschececon/23
Marked
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Modified Planar Inverted-L Antenna
(2003)
Evans, Jonathan; Ammann, Max
Modified Planar Inverted-L Antenna
(2003)
Evans, Jonathan; Ammann, Max
Abstract:
<p>A hybrid inverted-L antenna (HIL) has been shown to reduce the physical height of a square planar monopole antenna, while retaining a relatively wide impedance bandwidth and good radiation pattern characteristics. The introduction of horizontal slots in the vertical edges of the antenna cause the surface current to meander, resulting in a decrease in the lower edge frequency of the impedance bandwidth. The impact of different sizes and arrangements of slots on impedance and radiation pattern bandwidth, gain and surface current distribution is simulated using transmission line modelling (TLM). Simulated results for impedance bandwidth are verified with measurements. With other modifications these antennas are proposed for wireless and mobile applications in the 2.45 GHz and 5.8 GHz ISM bands.</p>
http://arrow.dit.ie/engschececon/22
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Group Delay Performance of Ultra Wideband Monopole Antennas for Communication Applications
(2008)
McEvoy, Patrick; John, Matthias; Curto, Sergio; Ammann, Max
Group Delay Performance of Ultra Wideband Monopole Antennas for Communication Applications
(2008)
McEvoy, Patrick; John, Matthias; Curto, Sergio; Ammann, Max
Abstract:
<p>While limited in dimensions, the shape of small ultra wideband (UWB) antennas can significantly impact on the required gain pattern stablity and the inherent impulse spreading throughout the bandwidth. The comparative gain performance of a square monopole and two Bezier-spline shaped monopoles (optimised for low insertion losses on small groundplanes) as portable UWB device antennas solutions are reported. By measuring the transmission group delay for the three geometries in paired combinations, the time-domain spreading due to each individual antenna is solved numerically with a system of equations.</p>
http://arrow.dit.ie/engschececon/20
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Effects of Klopfenstein Tapered Feedlines on the Frequency-and-time Domain Performance of Planar Monopole UWB Antennas
(2008)
Ruvio, Giuseppe; Ammann, Max
Effects of Klopfenstein Tapered Feedlines on the Frequency-and-time Domain Performance of Planar Monopole UWB Antennas
(2008)
Ruvio, Giuseppe; Ammann, Max
Abstract:
<p>The effects of a Klopfenstein tapered transmission line used to feed a typical planar monopole UWB antenna have been investigated in terms of impedance bandwidth, phase linearity and radiation properties. The analysis shows that the taper allows manipulation of the resonances occurring within the operating bandwidth. A Klopfenstein tapered feedline that matches the 50 Omega input impedance to 30 Omega along 50 mm is able to reduce the maximum group delay variation by 85% with an acceptable variation of the impedance bandwidth and minor changes in the radiation pattern.</p>
http://arrow.dit.ie/engschececon/16
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A Comparison of Some Low Cost Laminates for Antennas Operating in the 2.45 GHZ ISM Band
(1998)
Ammann, Max
A Comparison of Some Low Cost Laminates for Antennas Operating in the 2.45 GHZ ISM Band
(1998)
Ammann, Max
Abstract:
<p>An evaluation of some low-cost laminates suitable for microstrip patch antennas is presented. Criteria for the selection of substrates for antenna fabrication are given careful consideration. A coaxial-probe fed linearly-polarized rectangular microstrip patch operating at a frequency of 2.45 GHz was fabricated on four different low cost laminates. The substrates used were polyester, epoxy glass (FR-4), a ceramic filled PTFE composite and a woven glass-reinforced hydrocarbon and ceramic thermoset material. Material properties are discussed and the antenna performances are evaluated and compared to one fabricated on a thick glass-loaded microfiber PTFE substrate. An evaluation of some inexpensive microstrip antenna CAD packages, which employ closed-form expressions based on transmission-line and cavity models, is also given. These models ignore the diffraction effects of a finite ground-plane.</p>
http://arrow.dit.ie/engschececon/14
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Design of Compact Multi-band EBG Structures
(2007)
Bao, Xiulong; Ammann, Max
Design of Compact Multi-band EBG Structures
(2007)
Bao, Xiulong; Ammann, Max
Abstract:
<p>Several novel compact multiple-band high-impedance surface EBG structures are presented. By utilizing four S-shape corrugated arms or spiral arms connected to the edge of a small square patch to increase the inductance, the resonant frequency of the EBG structure can be significantly reduced. In order to broaden the width of the stopband and adjust the ratio of the centre frequencies for multi-band EBG a log periodic distance between the S-shape strips is implemented. The effects of the parameters of the EBG structure on the width of stopbands are discussed in detail. The results show that the proposed novel EBG structure can provide more multiple bandgap and reduce the EBG size for a fixed periodicity. This proposed EBG can be usefully applied to multiple frequency antennas and low frequency antennas.</p>
http://arrow.dit.ie/engschececon/13
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Dual-band Monopole Antenna with Stagger-tuned Arms for Broadbanding
(2005)
Ammann, Max; Farrell, R.
Dual-band Monopole Antenna with Stagger-tuned Arms for Broadbanding
(2005)
Ammann, Max; Farrell, R.
Abstract:
<p>The paper describes a dual-band miniaturized printed monopole for integration in modern wireless systems. The printed monopole is augmented with two arms, resonant at slightly different frequencies, providing a broadened response for the upper band. The achieved bandwidth for the high band is 36%. These antennas are proposed for the emerging dual-mode multi-band WLAN transceivers, which operate over a wide range of bands as dictated by national authorities. Measured and simulated data, including return loss, antenna gain and radiation patterns, are presented. The numerical method employed was the finite integration technique.</p>
http://arrow.dit.ie/engschececon/11
Displaying Results 226 - 250 of 298 on page 10 of 12
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Item Type
Conference item (151)
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Journal article (111)
Master thesis (taught) (19)
Report (2)
Other (2)
Institution
Dublin City University (15)
NUI Galway (9)
NUI Maynooth (8)
Trinity College Dublin (5)
University of Limerick (1)
Dublin Institute of Technology (260)
Peer Review Status
Peer reviewed (247)
Non peer reviewed (51)
Year
2012 (5)
2011 (23)
2010 (33)
2009 (38)
2008 (44)
2007 (35)
2006 (33)
2005 (24)
2004 (27)
2003 (10)
2002 (3)
2001 (4)
2000 (2)
1999 (1)
1998 (1)
1997 (2)
1996 (1)
1994 (2)
1993 (2)
1992 (3)
1991 (1)
1989 (2)
1985 (1)
1984 (1)
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