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Applied Computational Electromagnetics Society Journal
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2002, International Conference on Mathematical Methods in Electromagnetic Theory
2002, International Conference on Mathematical Methods in Electromagnetic Theory
2002
2002, … in Electromagnetic Theory, 2002. MMET'02. …
An analytical approach for the study of microwave devices and antennas printed on anisotropic substrates is presented. This is based on the geometrical optics approach in conjunction with a reflection coefficient established through a Wiener-Hopf solution of the ...
Applied Computational Electromagnetics Society Journal
1997
Abstract A rigorous field theory analysis of discontinuities between planar transmission lines, where one part of the transmission line is printed on insulating and the other on partially doped silicon material is presented. This kind of transition has not been investigated in great detail in the open literature yet, but is of importance for implementing semiconductor-based slow-wave structures in a circuit environment.
2000, Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)
2001, IEEE Transactions on Electromagnetic Compatibility
1997
In this study, three robust predicting methods, namely artificial neural network (ANN), adaptive neuro fuzzy inference system (ANFIS) and support vector machine (SVM) were used for computing the resonant frequency of A-shaped compact microstrip antennas (ACMAs) operating at UHF band. Firstly, the resonant frequencies of 144 ACMAs with various dimensions and electrical parameters were simulated with the help of IE3D™ based on method of moment (MoM). The ANN, ANFIS and SVM models for computing the resonant frequency were then built by considering the simulation data. 124 simulated ACMAs were utilized for training and the remaining 20 ACMAs were used for testing the ANN, ANFIS and SVM models. The performance of the ANN, ANFIS and SVM models are compared in the training and test process. The average percentage errors (APE) regarding the computed resonant frequencies for training of the ANN, ANFIS and SVM were obtained as 0.457%, 0.399% and 0.600%, respectively. The constructed models were then tested and APE values as 0.601% for ANN, 0.744% for ANFIS and 0.623% for SVM were achieved. The results obtained here show that ANN, ANFIS and SVM methods can be successfully applied to compute the resonant frequency of ACMAs, since they are useful and versatile methods that yield accurate results.
Abstract ─ This paper presents a novel compact microstrip band-stop filter (BSF) based on octagonal defected ground structure (DGS) along with interdigital and compensated capacitors. The proposed BSF has lower and higher cut-off frequencies of 3.4 GHz and 5.3 GHz, respectively. A comparison between simulation and measurement results confirms the validity of the BSF configuration and the design procedure. The compact filter occupies an area of (0.45g × 0.35g) with g = 0.044 m on an r = 3.66 substrate and shows a 44% bandwidth ( 2GHz) and a return loss of 0.1 dB. The experimental results show the excellent agreement with theoretical simulation results.
2008
James Clerk Maxwell's presentation titled,“A Dynamical Theory of the Electromagnetic Field” in 1864 established the foundation for electromagnetic field theory as we know it today [1]. His work, which drew upon the observations of Faraday, Ampere, Oersted, Gauss and others, introduced equations describing the relationship between electric and magnetic fields, electric charges and electric currents.
2008, Microwave and Optical Technology Letters
The quality factor, bandwidth, and efficiency are antenna's figures of merit and these are interrelated. There is no typical method that gives full freedom to optimize these independently. Here we proposed a novel and new method to optimize bandwidth with respect to radiation quality factor Qr. Slicing a substrate into two thin layers substrate, an impedance bandwidth of 12% is achieved while reducing the volume by 44.5%. The technique proposed shows that instead of single thick substrate, if two thin substrates are used, an enhancement of impedance bandwidth takes place while maintaining high antenna gain and radiation efficiency. This is a new and novel technique for bandwidth enhancement in microstrip patch antenna and is quite different from stacked antenna. In this article, we sliced a substrate into two thin substrates each of 1-mm thick to achieve a bandwidth of 12% and radiation efficiency of 80.5549 with an overall volume reduction of 44.5%. While a single substrate of thickness 2.5 mm which is more than the total thickness of the discussed structure gives only 5% bandwidth for same antenna dimensions. The proposed structure will find potential application in MIMO antenna system due to its volume reduction and other enhanced features. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1162–1165, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23323
2004, IEEE Transactions on Antennas and Propagation
2000, IEEE Transactions on Antennas and Propagation
2003, Microwave and Optical Technology Letters
2002, IEEE Transactions on Advanced Packaging
2005
2002, IEEE Transactions on Antennas and Propagation
2008, Progress in Electromagnetics Research B
2013, 2013 7th European Conference on Antennas and Propagation
This paper provides details on how to investigate anew method of teaching microstrip patch antenna design for undergraduate students by using MATLAB in-conjunction with one of the electromagnetic software packages called SONNET that can be called from MATLAB program. This is achieved by designing a friendly graphical user interface (GUI) for microstrip patch antennas through which antenna parameters and radiation pattern can be determined and also directly called Sonnet for electromagnetic simulation of the antenna.
The paper investigates single band planar resonant antenna inspired by phi-shaped slotted metamaterial superstrate and a square patch antenna is used as a primary radiator. The antenna is modeled using finite difference time domain method and resonates at S band. The antenna comprises of single layer symmetrical metamaterial superstrate which is used to suppress surface waves based on-negative characteristics. The effective material parameters of the metamaterial structure are extracted from S-parameters using Nicholson–Ross–Weir method. The antenna achieves −28.64 dB reflection coefficient of 2.4 GHz and also maintains good radiation characteristics with a peak measured gain of 7.94 dB at its operating frequency. Due to its advantages, the antenna can be used for modern wireless communications.
2012, International Journal of Engineering
2005, Microwave and Optical Technology Letters
2006
A MATLAB/GUI (Graphical User Interface) based simulation tool was developed for the design of both rectangular and circular microstrip patch antenna and for use as an educational material. Transmission line and cavity modeling technique were used in the codes utilized for deriving the antenna parameters. The GUI allowed radiation pattern of the designed antenna to be viewed in both Polar and Cartesian form. For electromagnetic validation of characteristic performance and parameters, Sonnet-Lite was code-coupled with MATLAB to produce the antenna return loss, VSWR, and input impedance. The interface provided a drop-down menu that allowed quick design and simulation of any given antenna specification in the rectangular or circular form thereby providing a quick visualization of the effect of variation in antenna parameters on their characteristic performance.
— During the past ten years, a great interest in the research of metamaterials has been observed. Metamaterials are artificially invented materials that show the properties which are not detected in naturally occurring materials. Metamaterials exhibits negative permittivity and/ or negative permeability. This paper presents a review of different types of metamaterials, their own unique properties and advantages.
2003
This work shows the performance of different decision feedback equalizers (DFEs) for high-speed data transmission over a telephone line. The analyzed structures are: the interference intersymbol-predictive decision feedback equalizer (ISI-DFE), the decision feedback equalizer with noise predictor (NP-DFE) and the hybrid-type DFE (H-DFE).
2000, IEEE Transactions on Microwave Theory and Techniques
2008, Progress in Electromagnetics Research-pier