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Proceedings ArticleDOI

Accurate CAD formulation for rectangular microstrip patch antennas

03 Jul 2005-pp 122-125

AbstractA 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.

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Citations
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Proceedings ArticleDOI
01 Dec 2007
TL;DR: The effect of aspect ratio of rectangular microstrip patch on its input impedance is demonstrated and computed results have been verified with own experiments and simulated data showing very close agreement amongst them.
Abstract: An improved CAD formulation is proposed to determine accurate input impedance of rectangular microstrip patches with variable aspect ratio. This paper demonstrate the effect of aspect ratio of rectangular microstrip patch on its input impedance. The computed results have been verified with our own experiments and simulated data showing very close agreement amongst them.

2 citations


Cites methods from "Accurate CAD formulation for rectan..."

  • ...A simplified schematic diagram of probe fed rectangular microstrip patch is shown in Fig. 1 having length L, and width w. One very accurate CAD formulation to calculate resonant frequency of rectangular microstrip patch with variable aspect ratio is proposed in [ 2 ]....

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  • ...The formulation proposed in [ 2 ] is utilized and extended to calculate the input impedance of rectangular microstrip patch having variable aspect ratio....

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Proceedings ArticleDOI
01 Dec 2007
Abstract: In this paper, we have presented a comprehensive review of research on microstrip antennas conducted at the Institute of radio Physics and Electronics, University of Calcutta with an emphasis to those done in recent years.

1 citations


Additional excerpts

  • ...Another common geometry of microstrip antenna, the rectangular shape is also investigated and an improved design formulation is proposed to determine the accurate resonant frequency and input impedance of the rectangular microstrip antenna with and without air gap for various W/L ratio [15],[16]....

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References
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Journal ArticleDOI
Abstract: The electromagnetic properties of electrically thick rectangular microstrip antennas were investigated experimentally. Antennas were fabricated with different patch sizes and with electrical thicknesses ranging from 0.03 to 0.23 wavelengths in the dielectric substrate. The resonant frequencies were measured and compared to existing formulas. The bandwidth was calculated as a function of electrical thickness and the antenna radiation patterns were measured.

336 citations


"Accurate CAD formulation for rectan..." refers background in this paper

  • ...Figure 2 shows the computed and measured [4] resonant frequencies of a rectangular microstrip patch as a function of substrate thickness h....

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Journal ArticleDOI
Abstract: Micromachining techniques using closely spaced holes have been used underneath a microstrip antenna on a high dielectric-constant substrate (/spl epsiv//sub r/=10.8) to synthesize a localized low dielectric-constant environment (/spl epsiv//sub r/=2.3). The measured radiation efficiency of a microstrip antenna on a micromachined 635-/spl mu/m thick /spl epsiv//sub r/=10.8 Duroid 6010 substrate increased from 48/spl plusmn/3% to 73/spl plusmn/3% at 12.8-13.0 GHz (including 3.3-cm feed line losses). We believe that this technique can be applied to millimeter-wave antennas (microstrip, dipoles, slots, etc.) on silicon and GaAs substrates to result in relatively wideband (3-6%) monolithic microwave integrated circuits (MMIC) active antenna modules for phased-arrays and collision-avoidance systems.

223 citations

Journal ArticleDOI
Abstract: An improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps. Unlike the previous models, the present one is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch and also to the substrates covering the entire range of dielectric constants. The computed results for different antenna dimensions and modes of resonance are compared with the experimental values.

122 citations


"Accurate CAD formulation for rectan..." refers background or methods in this paper

  • ...44xa (2) The effective radius of a circular microstrip patch due to the fringing is given as (1] a=a(l+q), where q is the fringing factor derived in [1]....

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  • ...In this paper, we propose yet another CAD formula based on one recent CAD model reported for circular patch in [1] to accurately estimate the resonant frequency of any rectangular patch with any length-to-width ratios....

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Journal ArticleDOI
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.

8 citations


"Accurate CAD formulation for rectan..." refers background in this paper

  • ...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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