Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Infante, L.; Maci, S.

doi:10.1109/lawp.2003.820685

Cited by 21 publications

(8 citation statements)

References 7 publications

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“…3(a), since an LED as a surface light source is depart from the focus of the parabolic reflector, while a point light source is satisfied with the function of a parabolic reflector as shown in Fig. 2 [7].…”

Section: Ray-tracingmentioning

confidence: 99%

Study on the Design of a High Condensing LED Searchlight

Kim¹,

Kim²,

Kim³

et al. 2015

Transactions on Electrical and Electronic Materials

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This paper dealt with the condensing technology of an LED light source that uses a parabolic reflector to replace a searchlight equipped with a xenon lamp. A ray-tracing simulation was conducted to analyze the influence of the diameter of the reflector and the size of the light source on light condensing. The combination of a parabolic reflector with a diameter of 620 mm and a focal distance of 220 mm, and a 9 mm multi-chip package (MCP) with a luminous flux of 7,000 lm showed the narrowest beam angle. The luminous intensity at the center was measured at 7.7×10 6 cd.The distance between the light source and the point where the illuminance was 1 lx was calculated to be 2.8 km. The power consumption of the system was 95 W, which is only 9.5% of that of the 1 kW xenon searchlight, and the beam angle was 1.03°. In a site experiment, it was confirmed that the light ray reflected from the LED searchlight proceeds forward without any diffusion because of the narrow beam angle.

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Section: Ray-tracingmentioning

confidence: 99%

Study on the Design of a High Condensing LED Searchlight

Kim¹,

Kim²,

Kim³

et al. 2015

Transactions on Electrical and Electronic Materials

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“…When the electrical size of objects are on the order of hundreds or thousands of working wavelength λ, that is, the essential frequencies k of the wave field are high enough, the physical optics (PO) approximation has been accepted as an efficient approach for analyzing the scattering and radiation electromagnetic problems [2][3][4][5][6][7][8][9][10][11][12][13][14][16][17][18][19], which was suggested by Macdonald [4] early in 1913. The PO current on a scattering surface lit region is defined by j (s) PO (r) = 2 ∂u (i) (r) ∂n , j (h) PO (r) = 2u (i) (r),…”

Section: Introductionmentioning

confidence: 99%

An Efficient Method for Computing Highly Oscillatory Physical Optics Integral

Jiang

Chew

2012

PIER

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Abstract-In this work, we use the numerical steepest descent path (numerical SDP) method in complex analysis theory to calculate the highly oscillatory physical optics (PO) integral with quadratic phase and amplitude variations on the triangular patch. The Stokes' phenomenon will occur due to various asymptotic behaviors on different domains. The stationary phase point contributions are carefully studied by the numerical SDP method and complex analysis using contour deformation. Its result agrees very well with the leading terms of the traditional asymptotic expansion. Furthermore, the resonance points and vertex points contributions from the PO integral are also extracted. Compared with traditional approximate asymptotic expansion approach, our method has significantly improved the PO integral accuracy by one to two digits (10 −1 to 10 −2 ) for evaluating the PO integral. Moreover, the computation effort for the highly oscillatory integral is frequency independent. Numerical results for PO integral on the triangular patch are given to verify the proposed numerical SDP theory.

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“…Recently, however, near-fields have gradually attracted considerable interest [8][9][10][11][12][13][14][15][16][17][18], especially for high power microwave transmission [17], and military applications of active deny systems (ADS) [11]. Investigations have been carried out with various techniques, such as geometry diffraction theory [10], line-integral representation of the Kirchhoff-type aperture radiation [14], spherical wave expansion [15]. In addition, some other methods, such as utilizing an equivalent magnetic current [16], or an equivalent electric current [18] are helpful to study near-field behavior.…”

Section: Introductionmentioning

confidence: 99%

Near-field behavior from circular aperture antenna and tunable gain of a super-Gaussian beam

Shi

Liu

et al. 2011

Journal of Modern Optics

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Using the aperture field integral method, near-field behavior of a super-Gaussian beam from a circular aperture is presented. Some analyzing expressions of aperture antenna gain are obtained, both under the focusing condition and in unfocused cases. It has been demonstrated that under the focusing condition, the gain at focus of a circular aperture antenna varies evidently with super-Gaussian parameter m. For the unfocused case, the peak gain of an aperture antenna is achieved when m ¼ 2. Furthermore, radiation patterns of an aperture antenna relate to the observing point position as well as the ratio of the aperture (RAW) to the beam waist. An important finding is that the gain of the aperture antenna can be tuned by varying m.

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Near-field line-integral representation of the Kirchhoff-type aperture radiation for a parabolic reflector

Cited by 21 publications

References 7 publications

Study on the Design of a High Condensing LED Searchlight

Study on the Design of a High Condensing LED Searchlight

An Efficient Method for Computing Highly Oscillatory Physical Optics Integral

Near-field behavior from circular aperture antenna and tunable gain of a super-Gaussian beam

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