An antenna pattern measurement technique for eliminating the fields scattered from the edges of a finite ground plane

Williams, J.T.; Delgado, H.J.; Long, Stuart A.

doi:10.1109/8.102744

Cited by 16 publications

(7 citation statements)

References 15 publications

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“…Up to now, numerical and analytical techniques have been used to analyse the characteristics of linearly polarized single element antennas with infinite and finite ground planes [9][10][11][12][13][14]. Here, the characteristics of a circularly polarized array antenna are analysed to find out which differences can occur as compared to the previous case.…”

Section: Resultsmentioning

confidence: 99%

Numerical analysis of ground plane size effects on patch array antenna characteristics for mobile satellite communications

Sumantyo

Ito

Delaune

et al. 2005

Int. J. Numer. Model.

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SUMMARYIn this research, a patch array antenna for mobile satellite communications aiming at ETS-VIII applications has been developed. The ground plane size effects on the antenna characteristics were investigated. Finite and infinite ground planes were analysed by the finite integration technique (FIT) for time domain analysis, the finite element method (FEM) and the method of moments (MoM) for spectral domain analysis. Then measurements of the fabricated antenna were performed to confirm the analysis results. It is clear that the frequency characteristics of the axial ratio are influenced by the variation in the ground plane size. When the ground plane size is increased, the edge-diffracted field causes tilting of the beam in the direction of low elevation angles and causes a decrease in the maximum gain and in the 3 dBbeamwidth of axial ratio in the elevation plane. In the conical-cut direction, an increase in ground plane size induces a decrease in the 3 dB-beamwidth of axial ratio for FEM, but shows the opposite result for FIT and measurement. In addition, an increase in ground plane size also induces increases in maximum gain and its 6 dBic-beamwidth along with a shift in the maximum gain in the direction of low azimuth angle.

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Section: Resultsmentioning

confidence: 99%

Numerical analysis of ground plane size effects on patch array antenna characteristics for mobile satellite communications

Sumantyo

Ito

Delaune

et al. 2005

Int. J. Numer. Model.

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show abstract

“…To recover the spherical wave spectrum of the antenna as if it was placed on an infinite ground plane, the field scattered by the FGP edges has to be removed from the SWE. In this paper we demonstrate that the technique proposed in [13] can also be used in near-field measurement and is not limited to flushmounted antennas. This technique is a consequence of the image theorem which does not depend on the source position or on the farfield approximation.…”

Section: Introductionmentioning

confidence: 99%

“…Subtraction technique [13], demonstrated for the hard component of the edge diffracted field, corresponds to Equation (2c). Using a ground plane with a finite thickness we also have to consider the induced electric currents on the perimeter sides (i.e., the sides concerning the thickness).…”

Section: Theoretical Overviewmentioning

confidence: 99%

“…These techniques, however, have some drawbacks: in particular they do not permit to determine the radiation pattern at the angles near the horizon with sufficient accuracy. An alternative is given by the numerical technique proposed by Williams [13] based on the subtraction of the scattered field measured on the backside of the FGP (i.e. the side not hosting the antenna) from that measured on the front side.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the scattered field interferes with the field radiated by the antenna producing a radiation pattern with back-side lobes and front-side ripple. The effects of the finite ground plane (FGP) on the radiation pattern of antennas have been studied by several researchers in order to improve the radiation characteristics of the antennas [6][7][8][9][10][11][12] as well as to eliminate the field scattered by the edges of the ground plane from measured data [13][14][15][16][17]. In this case, time gating [16,17] is used to remove the scattered fields from measured data while absorbent materials placed along the edges [14,15] are used to reduce the effects of the unwanted scattered field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Numerical Filter to Remove the Field Scattered by the Edges of a Finite Ground Plane From Measured Data

Giampaolo¹

2008

PIER B

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Abstract-The measurement of the field radiated from an antenna placed above a finite ground plane experiences the effects of the field scattered by the edges of the ground plane. A new numerical method to remove these effects from measured data is presented here. It resorts to the image theorem and can be used for both near-field and far-field measurements. A simple and effective algorithm has been developed to apply that method to fields described by means of spherical wave expansion. A numerical validation shows the effectiveness of the method.

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A comparison of CAD models for radiation from rectangular microstrip patches

Jackson

Williams

1991

Int. J. Microw. Mill.‐Wave Comput.‐Aided Eng.

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A comparison of radiation models for a rectangular patch antenna is made. The dominant mode electric current model and magnetic current model are each applied to the cases of a rectangular patch on an infinite substrate, and a patch on a substrate which is truncated at the edges of the patch. It is noted that exact agreement is obtained between the two models for the case of a resonant patch, for both the infinite substrate and truncated substrate cases. The effects of dielectric truncation on the radiation patterns is discussed and the electric current model is also extended to include the effects of feed-probe radiation and radiation from higher-order modes on the patch.

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An antenna pattern measurement technique for eliminating the fields scattered from the edges of a finite ground plane

Cited by 16 publications

References 15 publications

Numerical analysis of ground plane size effects on patch array antenna characteristics for mobile satellite communications

Numerical analysis of ground plane size effects on patch array antenna characteristics for mobile satellite communications

A Numerical Filter to Remove the Field Scattered by the Edges of a Finite Ground Plane From Measured Data

A comparison of CAD models for radiation from rectangular microstrip patches

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