Revista y Edición

Volumen 73 (2022): Edición 4 (August 2022)

Volumen 73 (2022): Edición 3 (June 2022)

Volumen 73 (2022): Edición 2 (April 2022)

Volumen 73 (2022): Edición 1 (February 2022)

Volumen 72 (2021): Edición 6 (December 2021)

Volumen 72 (2021): Edición 5 (September 2021)

Volumen 72 (2021): Edición 4 (August 2021)

Volumen 72 (2021): Edición 3 (June 2021)

Volumen 72 (2021): Edición 2 (April 2021)

Volumen 72 (2021): Edición 1 (February 2021)

Volumen 71 (2020): Edición 6 (December 2020)

Volumen 71 (2020): Edición 5 (September 2020)

Volumen 71 (2020): Edición 4 (August 2020)

Volumen 71 (2020): Edición 3 (June 2020)

Volumen 71 (2020): Edición 2 (April 2020)

Volumen 71 (2020): Edición 1 (February 2020)

Volumen 70 (2019): Edición 7 (December 2019)
Special Edición

Volumen 70 (2019): Edición 6 (December 2019)

Volumen 70 (2019): Edición 5 (September 2019)

Volumen 70 (2019): Edición 4 (August 2019)

Volumen 70 (2019): Edición 3 (June 2019)

Volumen 70 (2019): Edición 2 (April 2019)

Volumen 70 (2019): Edición 1 (February 2019)

Volumen 69 (2018): Edición 6 (December 2018)

Volumen 69 (2018): Edición 5 (September 2018)

Volumen 69 (2018): Edición 4 (August 2018)

Volumen 69 (2018): Edición 3 (June 2018)

Volumen 69 (2018): Edición 2 (March 2018)

Volumen 69 (2018): Edición 1 (January 2018)

Volumen 68 (2017): Edición 7 (December 2017)

Volumen 68 (2017): Edición 6 (November 2017)

Volumen 68 (2017): Edición 5 (September 2017)

Volumen 68 (2017): Edición 4 (August 2017)

Volumen 68 (2017): Edición 3 (May 2017)

Volumen 68 (2017): Edición 2 (March 2017)

Volumen 68 (2017): Edición 1 (January 2017)

Volumen 67 (2016): Edición 6 (December 2016)

Volumen 67 (2016): Edición 5 (September 2016)

Volumen 67 (2016): Edición 4 (July 2016)

Volumen 67 (2016): Edición 3 (May 2016)

Volumen 67 (2016): Edición 2 (April 2016)

Volumen 67 (2016): Edición 1 (January 2016)

Volumen 66 (2015): Edición 6 (November 2015)

Volumen 66 (2015): Edición 5 (September 2015)

Volumen 66 (2015): Edición 4 (July 2015)

Volumen 66 (2015): Edición 3 (May 2015)

Volumen 66 (2015): Edición 2 (March 2015)

Volumen 66 (2015): Edición 1 (January 2015)

Volumen 65 (2014): Edición 6 (November 2014)

Volumen 65 (2014): Edición 5 (September 2014)

Volumen 65 (2014): Edición 4 (July 2014)

Volumen 65 (2014): Edición 3 (May 2014)

Volumen 65 (2014): Edición 2 (March 2014)

Volumen 65 (2014): Edición 1 (January 2014)

Volumen 64 (2013): Edición 6 (November 2013)

Volumen 64 (2013): Edición 5 (September 2013)

Volumen 64 (2013): Edición 4 (June 2013)

Volumen 64 (2013): Edición 3 (May 2013)

Volumen 64 (2013): Edición 2 (March 2013)

Volumen 64 (2013): Edición 1 (January 2013)

Volumen 63 (2012): Edición 6 (November 2012)

Volumen 63 (2012): Edición 5 (September 2012)

Volumen 63 (2012): Edición 4 (July 2012)

Volumen 63 (2012): Edición 3 (May 2012)

Volumen 63 (2012): Edición 2 (March 2012)

Volumen 63 (2012): Edición 1 (January 2012)

Volumen 62 (2011): Edición 6 (November 2011)

Volumen 62 (2011): Edición 5 (September 2011)

Volumen 62 (2011): Edición 4 (July 2011)

Volumen 62 (2011): Edición 3 (May 2011)

Volumen 62 (2011): Edición 2 (March 2011)

Volumen 62 (2011): Edición 1 (January 2011)

Volumen 61 (2010): Edición 6 (November 2010)

Volumen 61 (2010): Edición 5 (September 2010)

Volumen 61 (2010): Edición 4 (July 2010)

Volumen 61 (2010): Edición 3 (May 2010)

Volumen 61 (2010): Edición 2 (March 2010)

Volumen 61 (2010): Edición 1 (January 2010)

Detalles de la revista
Formato
Revista
eISSN
1339-309X
Publicado por primera vez
07 Jun 2011
Periodo de publicación
6 veces al año
Idiomas
Inglés

Buscar

Volumen 67 (2016): Edición 5 (September 2016)

Detalles de la revista
Formato
Revista
eISSN
1339-309X
Publicado por primera vez
07 Jun 2011
Periodo de publicación
6 veces al año
Idiomas
Inglés

Buscar

11 Artículos
Acceso abierto

A Novel Current–Mode High–Frequency Polyphase Filter using Multi–Output Current Differencing Transconductance Amplifiers

Publicado en línea: 02 Nov 2016
Páginas: 311 - 322

Resumen

Abstract

This paper introduces a novel polyphase filter working at high centre frequency using multi-output current differencing transconductance amplifiers (MOCDTAs). The MOCDTA possesses characteristics of low input impedance, high output impedance, wide work frequency and linearly adjustable transconductance. The proposed filter consists of two MOCDTAs, two grounded capacitors, and no resistors. The features of low input impedance and high output impedance make it suitable for cascade. The bandwidth and centre frequency could be adjusted independently by external bias voltage VC and VCa. The image rejection ratio (IRR) could reach 31.6 dB at the centre frequency of 114 MHz, and its bandwidth could be 11.1 MHz. Besides, the centre frequency could be tuned from 38 MHz to 150 MHz with bandwidth of 20.1 MHz. Simulation results which verify the theory are included.

Palabras clave

  • current-mode
  • analogue circuits
  • polyphase filter
  • image rejection
  • independently tunable
  • MOCDTA
Acceso abierto

Analysis and Simulation on the Effect of Rotor Interturn Short Circuit on Magnetic Flux Density of Turbo–Generator

Publicado en línea: 02 Nov 2016
Páginas: 323 - 333

Resumen

Abstract

The intent of this paper is to investigate the effect of the interturn short circuit fault (ISCF) in rotor on the magnetic flux density (MFD) of turbo-generator. Different from other studies, this work not only pays attention to the influence of the faulty degrees on the general magnetic field, but also investigates the effect of the short circuit positions on the harmonic components of MFD. The theoretical analysis and the digital simulation through the FEM software Ansoft are performed for a QSFN-600-2YHG turbo-generator. Several significant formulas and conclusions drawn from the analysis and the simulation results are obtained to indicate the relation between the harmonic amplitude of the MFD and the faulty degree (via nm, the number of the short circuit turns), and the relation between the MFD harmonic amplitude and the faulty position (via αr, the angle of the two slots in which the interturn short circuit occurs). Also, the developing tendency of the general magnetic field intensity, the distribution of the magnetic flux lines, and the peak-to-peak value of MFD are presented.

Palabras clave

  • turbo-generator
  • rotor inter-turn short circuit
  • faulty degree
  • short circuit position
  • MFD
Acceso abierto

A New High Speed Induction Motor Drive based on Field Orientation and Hysteresis Current Comparison

Publicado en línea: 02 Nov 2016
Páginas: 334 - 342

Resumen

Abstract

This paper presents a new high speed induction motor drive based on the core advantage of field orientation control (FOC) and hysteresis current comparison (HCC). A complete closed loop speed-controlled induction motor drive system is developed consisting of an outer speed and an inner HCC algorithm which are optimised to obtain fast and stable speed response with effective current and torque tracking, both during transient and steady states. The developed model, being speed-controlled, was examined with step and ramp speed references and excellent performances obtained under full load stress. A speed response comparison of the model with the standard AC3 (Field-Oriented Control Induction Motor Drive) of MATLAB Simpower systems shows that the model achieved a rise time of 0.0762 seconds compared to 0.2930 seconds achieved by the AC3. Also, a settle time of 0.0775 seconds was obtained with the developed model while that of the AC3 model is 0.2986 seconds confirming, therefore, the superiority of the developed model over the AC3 model which, hitherto, served as a reference standard.

Palabras clave

  • induction motor drive
  • hysteresis current control
  • field orientation
  • vector control
Acceso abierto

Adaptive Current Control Method for Hybrid Active Power Filter

Publicado en línea: 02 Nov 2016
Páginas: 343 - 350

Resumen

Abstract

This paper proposes an adaptive current control method for Hybrid Active Power Filter (HAPF). It consists of a fuzzy-neural controller, identification and prediction model and cost function. The fuzzy-neural controller parameters are adjusted according to the cost function minimum criteria. For this reason, the proposed control method has a capability on-line control clings to variation of the load harmonic currents. Compared to the single fuzzy logic control method, the proposed control method shows the advantages of better dynamic response, compensation error in steady-state is smaller, able to online control is better and harmonics cancelling is more effective. Simulation and experimental results have demonstrated the effectiveness of the proposed control method.

Palabras clave

  • hybrid active power filter (HAPF)
  • fuzzy neural controller
  • reactive power compensation
  • predictive control
  • passive power filter
  • power quality
Acceso abierto

A Simultaneous Biogeography based Optimal Placement of DG Units and Capacitor Banks in Distribution Systems with Nonlinear Loads

Publicado en línea: 02 Nov 2016
Páginas: 351 - 357

Resumen

Abstract

This paper uses a new algorithm namely biogeography based optimization (BBO) intended for the simultaneous placement of the distributed generation (DG) units and the capacitor banks in the distribution network. The procedure of optimization has been conducted in the presence of nonlinear loads (a cause of harmonic injection). The purpose of simultaneous optimal placement of the DG and the capacitor is the reduction of active and reactive losses. The difference in the values of loss reduction at different levels of the load have been included in the objective function and the considered objective function includes the constraints of voltage, size and the number of DG units and capacitor banks and the allowable range of the total harmonic distortion (THD) of the total voltage in accordance with the IEEE 519 standards. In this paper the placement has been performed on two load types ie constant and mixed power, moreover the effects of load models on the results and the effects of optimal placement on reduction of the THD levels have also been analyzed. The mentioned cases have been studied on a 33 bus radial distribution system.

Palabras clave

  • biogeography based optimization
  • optimal placement
  • distributed generation units
  • capacitor banks
  • load models
  • harmonic load flow
Acceso abierto

A Multi–Objective Optimization for Performance Improvement of the Z–Source Active Power Filter

Publicado en línea: 02 Nov 2016
Páginas: 358 - 364

Resumen

Abstract

The high power dissipation is one of the most important problems of the z-source inverter (ZSI). By using an appropriate optimization scheme, the losses can be significantly reduced without any negative impact on the other characteristics of the inverter. In this paper, a multi-objective optimization is implemented in order to reduce the ZSI total losses as well as to improve the z-source active power filter (APF) performance. The optimization is focused on the four important objectives including power losses of the Z-source APF, the initial cost of the system components, the voltage and current ripples, and the boost factor of the z-source network. For these purposes, the multi-objective genetic algorithm (MOGA) is employed. The numerical and simulation results are presented to evaluate the optimization performance. The results show that a good balance can be achieved between the switching power losses, the voltage-current ripple levels, the component costs and the boost factor using the optimized parameters.

Palabras clave

  • active power filters
  • Z-source inverter
  • switching loss
  • parameter optimization
  • multi-objective genetic algorithms
Acceso abierto

Influence of Quenching Rate on the Structure, Morphology, and Hyperfine Parameters of Amorphous Ribbons

Publicado en línea: 02 Nov 2016
Páginas: 365 - 370

Resumen

Abstract

In this work, an amorphous alloy with the nominal composition of Fe78Si9B13 was produced by a melt spinning method. Using different velocities of a quenching cooper wheel enabled us to study the influence of quenching rate upon the structural characteristics of the resulting ribbons. Structural features of the samples were checked by Mössbauer spectroscopy and X-ray diffraction. The latter performed in a grazing angle geometry enabled us to explore both sides of the as-quenched ribbons. The onset of crystallization was estimated by differential scanning calorimetry (DSC) measurements. Surface features of the ribbons were examined by Scanning Electron Microscopy (SEM). In order to observe structural relaxation phenomena the samples were annealed below the onset of crystallization at 450 °C for 1 hour in Ar protective atmosphere. Even though the annealed ribbons are still amorphous relevant changes were observed in their hyperfin parameters as derived from Mssbauer spectrometry.

Palabras clave

  • amorphous alloys
  • XRD
  • DSC
  • SEM
  • Mössbauer spectrometry
  • heat treatment
Acceso abierto

A Novel Subcarrier Allocation Algorithm for MC–CDMA Systems

Publicado en línea: 02 Nov 2016
Páginas: 371 - 376

Resumen

Abstract

Multi carrier modulation techniques such as MC-CDMA are used in high-speed communication applications. Due to MC-CDMA being a multiuser in technology, the subcarrier quantity allocated per user decreases in case the quantity of active users increases. Consequently, data rates per user are reduced with the increase in the bit error rate (BER). Efficient allocation of subcarriers to users within the system can aid the overcoming of this problem. This study develops a new algorithm for subcarrier allocation and system performance improvement in terms of BER, and data rates in comparison to other algorithms were ensured.

Palabras clave

  • MC-CDMA
  • subcarrier allocation
  • fairness
  • data rate
Acceso abierto

Electrophysical Properties of GaAs P–I–N Structures for Concentrator Solar Cell Applications

Publicado en línea: 02 Nov 2016
Páginas: 377 - 382

Resumen

Abstract

This paper is dedicated to electro-physical characterisation of a GaAs p-i-n structure grown for solar cell applications, which was carried out by light and dark current-voltage (IV) and Deep Level Transient Fourier Spectroscopy (DLTFS) methods. The conversion efficiency and open-circuit voltage were determined from IV measurement at 1 and 20× sun light concentrations. Three electron like defects TAn1, TAn2, TDn and one hole like defect TBp obtained by DLTFS measurements were confirmed. The origin of these defect states was stated as native GaAs impurities.

Palabras clave

  • solar cell
  • GaAs concentrator solar cell
  • – measurement
  • DLTFS
  • defects
Acceso abierto

Microstrip Resonator with Slotted Ground Plane for Detecting Lateral Position

Publicado en línea: 02 Nov 2016
Páginas: 383 - 386

Resumen

Abstract

A new type of microwave position sensor is introduced. It is a microstrip stub resonator with slotted ground plane under the stub. It produces frequency-modulated signal with frequency corresponding to covering of the slot in the ground plane. The sensing is performed by sliding the metal plate over the slot. The structure is simple, low fabrication cost and compact. It is without multilayers, coupling, via holes, air bridges, active or discrete components.

Palabras clave

  • microwave
  • lateral position sensor
  • microstrip
  • slotted ground plane
Acceso abierto

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

Publicado en línea: 02 Nov 2016
Páginas: 387 - 389

Resumen

Abstract

A numerical analysis of microstrip meander delay lines is considered. Results of quasi-static and electromagnetic simulations are given. It is shown that when increasing a number of turns and proportionally reducing their length, distortions of a pulse signal in the line are reduced. At the same time, despite structure’s electrical width increase, the agreement between the results of quasi-static and electromagnetic analyses is improved. Thus, it is demonstrated that when designing the microstrip meander delay lines with minimal distortions, the quasi-static analysis is relevant.

Palabras clave

  • electromagnetic analysis
  • meander delay line
  • quasi-static approach
  • design constrains
  • simulation
11 Artículos
Acceso abierto

A Novel Current–Mode High–Frequency Polyphase Filter using Multi–Output Current Differencing Transconductance Amplifiers

Publicado en línea: 02 Nov 2016
Páginas: 311 - 322

Resumen

Abstract

This paper introduces a novel polyphase filter working at high centre frequency using multi-output current differencing transconductance amplifiers (MOCDTAs). The MOCDTA possesses characteristics of low input impedance, high output impedance, wide work frequency and linearly adjustable transconductance. The proposed filter consists of two MOCDTAs, two grounded capacitors, and no resistors. The features of low input impedance and high output impedance make it suitable for cascade. The bandwidth and centre frequency could be adjusted independently by external bias voltage VC and VCa. The image rejection ratio (IRR) could reach 31.6 dB at the centre frequency of 114 MHz, and its bandwidth could be 11.1 MHz. Besides, the centre frequency could be tuned from 38 MHz to 150 MHz with bandwidth of 20.1 MHz. Simulation results which verify the theory are included.

Palabras clave

  • current-mode
  • analogue circuits
  • polyphase filter
  • image rejection
  • independently tunable
  • MOCDTA
Acceso abierto

Analysis and Simulation on the Effect of Rotor Interturn Short Circuit on Magnetic Flux Density of Turbo–Generator

Publicado en línea: 02 Nov 2016
Páginas: 323 - 333

Resumen

Abstract

The intent of this paper is to investigate the effect of the interturn short circuit fault (ISCF) in rotor on the magnetic flux density (MFD) of turbo-generator. Different from other studies, this work not only pays attention to the influence of the faulty degrees on the general magnetic field, but also investigates the effect of the short circuit positions on the harmonic components of MFD. The theoretical analysis and the digital simulation through the FEM software Ansoft are performed for a QSFN-600-2YHG turbo-generator. Several significant formulas and conclusions drawn from the analysis and the simulation results are obtained to indicate the relation between the harmonic amplitude of the MFD and the faulty degree (via nm, the number of the short circuit turns), and the relation between the MFD harmonic amplitude and the faulty position (via αr, the angle of the two slots in which the interturn short circuit occurs). Also, the developing tendency of the general magnetic field intensity, the distribution of the magnetic flux lines, and the peak-to-peak value of MFD are presented.

Palabras clave

  • turbo-generator
  • rotor inter-turn short circuit
  • faulty degree
  • short circuit position
  • MFD
Acceso abierto

A New High Speed Induction Motor Drive based on Field Orientation and Hysteresis Current Comparison

Publicado en línea: 02 Nov 2016
Páginas: 334 - 342

Resumen

Abstract

This paper presents a new high speed induction motor drive based on the core advantage of field orientation control (FOC) and hysteresis current comparison (HCC). A complete closed loop speed-controlled induction motor drive system is developed consisting of an outer speed and an inner HCC algorithm which are optimised to obtain fast and stable speed response with effective current and torque tracking, both during transient and steady states. The developed model, being speed-controlled, was examined with step and ramp speed references and excellent performances obtained under full load stress. A speed response comparison of the model with the standard AC3 (Field-Oriented Control Induction Motor Drive) of MATLAB Simpower systems shows that the model achieved a rise time of 0.0762 seconds compared to 0.2930 seconds achieved by the AC3. Also, a settle time of 0.0775 seconds was obtained with the developed model while that of the AC3 model is 0.2986 seconds confirming, therefore, the superiority of the developed model over the AC3 model which, hitherto, served as a reference standard.

Palabras clave

  • induction motor drive
  • hysteresis current control
  • field orientation
  • vector control
Acceso abierto

Adaptive Current Control Method for Hybrid Active Power Filter

Publicado en línea: 02 Nov 2016
Páginas: 343 - 350

Resumen

Abstract

This paper proposes an adaptive current control method for Hybrid Active Power Filter (HAPF). It consists of a fuzzy-neural controller, identification and prediction model and cost function. The fuzzy-neural controller parameters are adjusted according to the cost function minimum criteria. For this reason, the proposed control method has a capability on-line control clings to variation of the load harmonic currents. Compared to the single fuzzy logic control method, the proposed control method shows the advantages of better dynamic response, compensation error in steady-state is smaller, able to online control is better and harmonics cancelling is more effective. Simulation and experimental results have demonstrated the effectiveness of the proposed control method.

Palabras clave

  • hybrid active power filter (HAPF)
  • fuzzy neural controller
  • reactive power compensation
  • predictive control
  • passive power filter
  • power quality
Acceso abierto

A Simultaneous Biogeography based Optimal Placement of DG Units and Capacitor Banks in Distribution Systems with Nonlinear Loads

Publicado en línea: 02 Nov 2016
Páginas: 351 - 357

Resumen

Abstract

This paper uses a new algorithm namely biogeography based optimization (BBO) intended for the simultaneous placement of the distributed generation (DG) units and the capacitor banks in the distribution network. The procedure of optimization has been conducted in the presence of nonlinear loads (a cause of harmonic injection). The purpose of simultaneous optimal placement of the DG and the capacitor is the reduction of active and reactive losses. The difference in the values of loss reduction at different levels of the load have been included in the objective function and the considered objective function includes the constraints of voltage, size and the number of DG units and capacitor banks and the allowable range of the total harmonic distortion (THD) of the total voltage in accordance with the IEEE 519 standards. In this paper the placement has been performed on two load types ie constant and mixed power, moreover the effects of load models on the results and the effects of optimal placement on reduction of the THD levels have also been analyzed. The mentioned cases have been studied on a 33 bus radial distribution system.

Palabras clave

  • biogeography based optimization
  • optimal placement
  • distributed generation units
  • capacitor banks
  • load models
  • harmonic load flow
Acceso abierto

A Multi–Objective Optimization for Performance Improvement of the Z–Source Active Power Filter

Publicado en línea: 02 Nov 2016
Páginas: 358 - 364

Resumen

Abstract

The high power dissipation is one of the most important problems of the z-source inverter (ZSI). By using an appropriate optimization scheme, the losses can be significantly reduced without any negative impact on the other characteristics of the inverter. In this paper, a multi-objective optimization is implemented in order to reduce the ZSI total losses as well as to improve the z-source active power filter (APF) performance. The optimization is focused on the four important objectives including power losses of the Z-source APF, the initial cost of the system components, the voltage and current ripples, and the boost factor of the z-source network. For these purposes, the multi-objective genetic algorithm (MOGA) is employed. The numerical and simulation results are presented to evaluate the optimization performance. The results show that a good balance can be achieved between the switching power losses, the voltage-current ripple levels, the component costs and the boost factor using the optimized parameters.

Palabras clave

  • active power filters
  • Z-source inverter
  • switching loss
  • parameter optimization
  • multi-objective genetic algorithms
Acceso abierto

Influence of Quenching Rate on the Structure, Morphology, and Hyperfine Parameters of Amorphous Ribbons

Publicado en línea: 02 Nov 2016
Páginas: 365 - 370

Resumen

Abstract

In this work, an amorphous alloy with the nominal composition of Fe78Si9B13 was produced by a melt spinning method. Using different velocities of a quenching cooper wheel enabled us to study the influence of quenching rate upon the structural characteristics of the resulting ribbons. Structural features of the samples were checked by Mössbauer spectroscopy and X-ray diffraction. The latter performed in a grazing angle geometry enabled us to explore both sides of the as-quenched ribbons. The onset of crystallization was estimated by differential scanning calorimetry (DSC) measurements. Surface features of the ribbons were examined by Scanning Electron Microscopy (SEM). In order to observe structural relaxation phenomena the samples were annealed below the onset of crystallization at 450 °C for 1 hour in Ar protective atmosphere. Even though the annealed ribbons are still amorphous relevant changes were observed in their hyperfin parameters as derived from Mssbauer spectrometry.

Palabras clave

  • amorphous alloys
  • XRD
  • DSC
  • SEM
  • Mössbauer spectrometry
  • heat treatment
Acceso abierto

A Novel Subcarrier Allocation Algorithm for MC–CDMA Systems

Publicado en línea: 02 Nov 2016
Páginas: 371 - 376

Resumen

Abstract

Multi carrier modulation techniques such as MC-CDMA are used in high-speed communication applications. Due to MC-CDMA being a multiuser in technology, the subcarrier quantity allocated per user decreases in case the quantity of active users increases. Consequently, data rates per user are reduced with the increase in the bit error rate (BER). Efficient allocation of subcarriers to users within the system can aid the overcoming of this problem. This study develops a new algorithm for subcarrier allocation and system performance improvement in terms of BER, and data rates in comparison to other algorithms were ensured.

Palabras clave

  • MC-CDMA
  • subcarrier allocation
  • fairness
  • data rate
Acceso abierto

Electrophysical Properties of GaAs P–I–N Structures for Concentrator Solar Cell Applications

Publicado en línea: 02 Nov 2016
Páginas: 377 - 382

Resumen

Abstract

This paper is dedicated to electro-physical characterisation of a GaAs p-i-n structure grown for solar cell applications, which was carried out by light and dark current-voltage (IV) and Deep Level Transient Fourier Spectroscopy (DLTFS) methods. The conversion efficiency and open-circuit voltage were determined from IV measurement at 1 and 20× sun light concentrations. Three electron like defects TAn1, TAn2, TDn and one hole like defect TBp obtained by DLTFS measurements were confirmed. The origin of these defect states was stated as native GaAs impurities.

Palabras clave

  • solar cell
  • GaAs concentrator solar cell
  • – measurement
  • DLTFS
  • defects
Acceso abierto

Microstrip Resonator with Slotted Ground Plane for Detecting Lateral Position

Publicado en línea: 02 Nov 2016
Páginas: 383 - 386

Resumen

Abstract

A new type of microwave position sensor is introduced. It is a microstrip stub resonator with slotted ground plane under the stub. It produces frequency-modulated signal with frequency corresponding to covering of the slot in the ground plane. The sensing is performed by sliding the metal plate over the slot. The structure is simple, low fabrication cost and compact. It is without multilayers, coupling, via holes, air bridges, active or discrete components.

Palabras clave

  • microwave
  • lateral position sensor
  • microstrip
  • slotted ground plane
Acceso abierto

Comparative Electromagnetic and Quasi–Static Simulations of a Shortpulse Propagation along Microstrip Meander Delay Lines with Design Constraints

Publicado en línea: 02 Nov 2016
Páginas: 387 - 389

Resumen

Abstract

A numerical analysis of microstrip meander delay lines is considered. Results of quasi-static and electromagnetic simulations are given. It is shown that when increasing a number of turns and proportionally reducing their length, distortions of a pulse signal in the line are reduced. At the same time, despite structure’s electrical width increase, the agreement between the results of quasi-static and electromagnetic analyses is improved. Thus, it is demonstrated that when designing the microstrip meander delay lines with minimal distortions, the quasi-static analysis is relevant.

Palabras clave

  • electromagnetic analysis
  • meander delay line
  • quasi-static approach
  • design constrains
  • simulation

Planifique su conferencia remota con Sciendo