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Journal ArticleDOI

Design considerations for rectangular microstrip antenna elements with various substrate thicknesses

05 Oct 1998-Microwave and Optical Technology Letters (Wiley)-Vol. 19, Iss: 2, pp 111-121
TL;DR: In this article, a set of graphs for a relevant set of parameters is presented which enables the designer to clearly see the tradeoffs involved in choosing specific parameters for the antenna and several parameters that are deterrents to the proper functioning of the antennas are also identified.
Abstract: The effective design and analysis of microstrip antennas presupposes the quantitative knowledge of the effects of the physical and mechanical properties of the patch, the ground plane, and the substrate material on electromagnetic properties of the antenna. The behavior of antenna electromagnetic properties for varying mechanical and physical properties of the patch, the ground plane, and the substrate material is presented. A set of graphs for a relevant set of parameters is presented which enables the designer to clearly see the tradeoffs involved in choosing specific parameters for the antenna. Several parameters that are deterrents to the proper functioning of the antennas are also identified. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 19: 111–121, 1998.
Citations
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Journal ArticleDOI
TL;DR: The resonant modes and characteristics of a rectangular microstrip with a variable air gap were theoretically and experimentally examined in this article, and the effect of varying width to length ratio was addressed and a computer aided design was presented.
Abstract: The resonant modes and characteristics of a rectangular microstrip with a variable air gap are theoretically and experimentally examined. Effect of varying width to length ratio is another important aspect addressed and a computer aided design is presented. Thorough experiments are presented, a few of which are reported for the first time. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 169–173, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24025

47 citations

Journal ArticleDOI
01 May 2013
TL;DR: In aBBOmDE, the performance of BBO is accelerated with the help of a modified mutation and clear duplicate operators, and modified DE is embedded as a neighborhood search operator to improve the fitness from a predefined threshold.
Abstract: Biogeography-based optimization (BBO) inherently lacks exploration capability that leads to slow convergence. To address this limitation, authors present a memetic algorithm (MA) named as aBBOmDE, which is a new variant of BBO. In aBBOmDE, the performance of BBO is accelerated with the help of a modified mutation and clear duplicate operators. Then modified DE (mDE) is embedded as a neighborhood search operator to improve the fitness from a predefined threshold. mDE is used with mutation operator DE/best/1/bin to explore the search near the best solution. The length of local search is a choice that balances between the search capability and the computational cost. In aBBOmDE, migration mechanism is kept same as that of BBO in order to maintain its exploitation ability. Modified operators are utilized to enhance the exploration ability while a neighborhood search operator further enhances the search capability of the algorithm. This combination significantly improves the convergence characteristics of the original algorithm. Extensive experiments have been carried out on forty benchmark functions to show the effectiveness of the proposed algorithm. The results have been compared with original BBO, DE, CMAES, other MA and DE/BBO, a hybrid version of DE and BBO. aBBOmDE is also applied to compute patch dimensions of rectangular microstrip patch antennas (MSAs) with various substrate thicknesses so as to be used a CAD formula for antenna design.

47 citations

Journal ArticleDOI
TL;DR: In this article, a low profile U-shape patch antenna for high gain and wide bandwidth is presented by introducing an inverted U shape slot on the circular ground plane (diameter of 40mm).
Abstract: In this article a compact low profile U-shape patch antenna for high gain and wide bandwidth is presented. By introducing an inverted U-shape slot on the circular ground plane (diameter of 40 mm) an adjustable wide impedance bandwidth is achieved. The simulated results are confirmed experimentally. An impedance bandwidth (S 11 ≤ −10 dB) up to about 100.35% is achieved by individually optimizing its parameters. The proposed antenna exhibits nearly stable radiation pattern with a maximum gain of 3.2 dBi. It makes the proposed antenna suitable for in wideband applications.

30 citations

Journal ArticleDOI
Ali Akdagli1
TL;DR: The presented formulas constructed by utilizing a differential evolution algorithm become very useful as computer‐aided design models for patch antenna design, as compared with previous results presented by several researchers.
Abstract: This letter presents the closed-from formulas for determining the patch dimensions of electrically thin and thick rectangular microstrip antennas. The presented formulas constructed by utilizing a differential evolution algorithm become very useful as computer-aided design (CAD) models for patch antenna design. A comparison between the calculated and experimental results derived from 33 patch antennas demonstrates that the proposed CAD formulas provide <0.16% and 0.22% errors on average for the patch length and patch width, respectively. The results obtained by using the formulas given here are found to be closer to the experimental values, as compared with previous results presented by several researchers. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2197–2201, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22679

4 citations

Proceedings ArticleDOI
03 Jul 2005
TL;DR: In this article, a new CAD formulation is proposed to estimate accurately the resonant frequency of rectangular microstrip patches having variable aspect ratios, which shows much closer approximations when compared with the measurements.
Abstract: A new CAD formulation is proposed to estimate accurately the resonant frequency of rectangular microstrip patches having variable aspect ratios. The computed results are verified by several experiments. Compared to earlier ones, the proposed formula shows much closer approximations when compared with the measurements.

2 citations


Cites background from "Design considerations for rectangul..."

  • ...TABLE I Comparison of the measured [2] and computed resonant frequencies for rectangular patches on low permittivity substrates with W/L < 1....

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  • ...55 Patch Patch WiL Substrate Resonant frequencyf, (GHz) length length thickness Measured Computed L W h (mm) [2] [Present] (mm) (mm) 13....

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  • ...Results Table I shows the comparison ofthe measured [2] and computed resonant frequencies for rectangular microstrip patches printed on low permittivity substrates of different thickness with various W/L ratio <1....

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