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Antenna Analysis (antenna + analysis)

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Engineering100%

Selected Abstracts

Source localization using electric and magnetic point dipoles with modified genetic algorithm

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 4 2009
Päivi K. Koivisto
Abstract A method to reconstruct the source current from far-field data in terms of electric and magnetic point dipoles is described. The inverse problem of solving the source from a known electromagnetic far-field pattern is carried out by a combination of genetic algorithm and local optimizers. The source is modelled by a small number of point dipoles, the locations, amplitudes and types of which are determined by minimizing the difference between the field of the ensemble and the targeted pattern. Uniqueness is ensured by limiting the number of dipoles together with an appropriately weighted minimum energy condition. A general description of the method applicable to antenna analysis and synthesis is given and three examples of its practical use are presented. Copyright © 2008 John Wiley & Sons, Ltd. [source]

The design and performance analysis of integrated amplifier patch antenna

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2008
Adnan Kaya
Abstract This work presents the design of an active amplifier antenna. Active integrated antennas can be obtained with active components directly connected to the antenna structure. In this article, a novel active integrated single microstrip antenna analysis and its radiation pattern and gain performance is proposed. A high-efficiency, low noise, and high linear compact amplifier integrated with a microstrip antenna at 1.6 GHz is presented for RF front-end circuit applications. The design in this study consists of a rectangular microstrip antenna with a pair of parallel slots loaded close to the radiating edge of the patch and three meandering narrow slots embedded in the antenna surface. With the proposed design a size reduction of 34% for the 1.6- and 2.6-GHz resonant frequencies is obtained and the two frequencies have an operation frequency ratio of 1.30. In this design approach, the measured antenna impedance is transformed with matching to the load impedance for maximum efficiency. With the proposed amplifier antenna design, the antenna radiation pattern can be better than an antenna radiation pattern without matching. In addition, it has been shown that compensation significantly improves the return loss matching level. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2732,2736, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23765 [source]

Hybrid mode matching and auxiliary sources technique for horn antenna analysis

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2007
S. G. Diamantis
Abstract A hybrid technique for the analysis of horn antennas is described based on a rigorous description of the horn aperture-free space discontinuity. The transition from the feeding waveguide to the radiating aperture is analyzed by using the mode matching technique (MMT) employing a stepped-waveguide approach. The discontinuity between the horn aperture and the free space is modeled by combining the method of auxiliary sources with the MMT for the stepped waveguide section. Results for the input standing wave ratio are given and compared with the available measurements, which demonstrate the very good performance of the method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 734,739, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22233 [source]

Analysis of a cylindrical patch antenna fed with coaxial probe using FDTD

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2003
Xiangyu Cao
Abstract The feed model is very important for microstrip antenna analysis using FDTD. In this paper, the feed model with coaxial probe is accurately and efficiently analysed in terms of the contour path technique, driving out the magnetic field modified equations and accomplishing the FDTD procedure. Finally, the characteristic parameters of a cylindrical patch antenna are predicted. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 406,408, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10932 [source]