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Parasitic Elements (parasitic + element)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

More stabilized triple-band antenna with a rolled radiating arm and a metallic rod for mobile applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009
Xingyu Zhang
Abstract In this article, a compact design of a flexible planar inverted-F antenna (PIFA) is proposed for triple-band (GSM/DCS/PCS) mobile phone application. The main radiating element of the antenna, which generates the GSM and DCS resonant modes, is printed on a flexible printed circuit board (FPCB) and rolled in a form of cylinder. To improve the construction stability of the antenna, a metallic rod is inserted into the centre of the rolled antenna. The metallic rod acting as a parasitic element of the antenna also generates the PCS resonant mode. The antenna prototype was fabricated and measured. Good agreement between the measurement and simulation results is obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 891,894, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24197 [source]

Finite element analysis of advanced multilayer capacitors

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 3 2003
L. Vu-Quoc
We establish a systematic methodology to design and analyse electromagnetic components such as advanced multilayer ceramic capacitors (MLCCs) using the finite element (FE) method. We employ a coupled formulation to compute the interaction between the electric and magnetic fields. Unlike a linear distribution of current assumed in the circuit model, an accurate electrostatic solution to model the entire advanced MLCCs (4 × 4 × 27 = 432 cells) is presented. The FE solution is used to compute the lumped parameters for a range of frequencies. These lumped parameters are then used to compute the parasitic elements of the MLCCs. We introduce two algorithms to efficiently analyse the behaviour of a capacitor with changing frequency. The lower frequency (much below the self-resonant frequency of the capacitor) algorithm separates the effect of the electric and magnetic fields and reduces the computational effort required to solve the FE problem, whereas, the high-frequency algorithm couples the effect between the electric and the magnetic fields. We use these algorithms in conjunction with a new multiple scale technique to effectively determine the small values of R, L and C in MLCCs. The formulation, the implementation, and the numerical results demonstrate the efficacy of the present FE formulation and establish a systematic methodology to design and analyse advanced electromagnetic components. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Generation, modeling, and analysis of CCII-based gyrators using the generalized symbolic framework for linear active circuits

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 3 2008
Ramy A. Saad
Abstract In this paper, CCII-based gyrators are synthesized, modeled, and analyzed using the generalized symbolic framework for linear active circuits. The systematic synthesis method using admittance matrix expansion, included in the framework, is applied to generate optimized nullor,mirror descriptions for the gyrator. The resulting CCII-based circuit representations for the gyrators, obtained from mapping nullor,mirror pairs in the ideal realizations with equivalent second-generation current conveyors (CCIIs), can be classified into two topologies according to the type of the CCII terminals handling the gyrator input and output signals. In topology I, the gyrator input and output terminals are CCIIs Y,Z -terminals, whereas in topology II, the gyrator input and output terminals are CCIIs X -terminals. The parasitic components within the synthesized circuits, associated with the actual CCIIs, are modeled and included in their expanded admittance matrices. Exact non-ideal analysis for two circuits belonging to the two topologies, involving the reduction of their expanded admittance matrices to port admittance matrices, is then carried out to investigate the practical functional performance for these circuits at their ports. The non-ideal performance analysis based on the CCII actual parasitic elements indicates that, from a practical perspective, the CCII-based gyrator circuits belonging to topology I are more efficient and suitable for the gyrator applications than those belonging to topology II in terms of bandwidth and operation at high frequencies. SPICE simulations are included to demonstrate the analytical results for the comparison between the practical performances of the two circuit topologies. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Analysis of wideband multilayer patch antenna with two parasitic elements

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009
J. A. Ansari
Abstract The analysis of stacked patch antenna with two parasitic elements is presented. The antenna shows improved radiation and directivity by 6.57 dB when compared with single layer patch antenna. The bandwidth of the antenna is found to be dependent on various parameters such as h1, h2, and s. The proposed results are compared with the IE3D simulation and reported experimental results. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1397,1401, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24378 [source]

A simple spice model for traveling wave semiconductor laser amplifier

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2007
Abhirup Das Barman
Abstract An equivalent lumped element electric circuit model for traveling wave semiconductor laser amplifier has been developed using the rate equation for carriers. SPICE simulation of the circuits gives results in close agreement with the experimental data and values from sophisticated analyses. The modulation bandwidth and transient response were examined by including parasitic elements in the intrinsic model. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1558,1561, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22483 [source]

A wideband low-profile microstrip antenna and array

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2006
Ka-Ming Mak
Abstract A high-gain wideband low-profile microstrip patch antenna array is designed and tested. A method for enhancing the impedance bandwidth through the combination of a driven rectangular patch with parasitic elements is proposed. The array, which has 16 elements in a 4 × 4 arrangement, is pasted on a 2-mm dielectric substrate. The impedance bandwidth and the gain of the array is 12% (for SWR , 2) centered at 4.5 GHz and 20 dBi, respectively. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 729,730, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21458 [source]