Topic
Fresnel zone
About: Fresnel zone is a research topic. Over the lifetime, 2337 publications have been published within this topic receiving 37650 citations.
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Dissertation•
12 Nov 2008
1 citations
Journal Article•
TL;DR: In this article, the FZP was used to construct a multibeam antenna with a feeding array, and with an adaptive signal processing procedure applied to the array, an estimation to the direction of arrival and a digital beamforming were achieved.
Abstract: The Fresnel Zone phase correcting Plate (FZP) has its focusing characteristics similar to that of the quadric surface, such as paraboloid etc., and with better paraxial scanning property. In this paper, the FZP is used to construct a multibeam antenna with a feeding array, and with an adaptive signal processing procedure applied to the array. An estimation to the direction of arrival and a digital beamforming are achieved. This is verified by the computer simulation results.
1 citations
Patent•
19 May 2014
TL;DR: In this article, the authors present a method capable of effectively displaying a communications sight line, which involves reflecting a predetermined weighted value in the calculation of a Fresnel zone for analyzing a communication sight line and adopting Hata model to estimate a distance range by RF output reflecting a path loss.
Abstract: The present specification relates to a method capable of effectively displaying a communications sight line, and the communications sight line display method involves reflecting a predetermined weighted value in the calculation of a Fresnel zone for analyzing a communications sight line, adopting Hata model to estimate a distance range by RF output reflecting a path loss, and restricting a Fresnel zone calculation range to effectively display a communications sight line.
1 citations
TL;DR: In this article, a variant of solution to the multiparametric problem of power transmission through a microwave beam in the Fresnel zone is proposed, and the power transmission with the use of beams with a Gaussian field distribution and beams having zero intensity along the axis is analyzed.
Abstract: A variant of solution to the multiparametric problem of power transmission through a microwave beam in the Fresnel zone is proposed. Methods for the power transmission with the use of beams with a Gaussian field distribution and beams having zero intensity along the axis are analyzed. For a specified geometry of the transmit-receive system, a relationship between the maximum power and the admissible field intensity in the rectenna plane is obtained.
1 citations
TL;DR: In this article, the vertical Rayleigh-Sommerfeld (VRS) diffraction theory is used for analyzing and calculating the focused field distributions of high-numerical-aperture (NA) multi-step hybrid Fresnel zone plates (M-SHFZP).
Abstract: The vertical Rayleigh-Sommerfeld (VRS) diffraction theory is used for analyzing and calculating the focused field distributions of high-numerical-aperture (NA) multi-step hybrid Fresnel zone plates (M-SHFZP). Under the illumination of linearlypolarized light, results are shown as follows: 1) Due to the transmission coefficient of the film changing with the depth of steps, the focused intensity of M-SHFZP is smaller than that of multi-step pure-phase Fresnel zone plates (M-SPFZP). However, the focal spot size of M-SHFZP is almost the same as that of M-SPFZP; 2) As the step number increases, the focused intensity increases, but the spot size is invariant; 3) The diffraction field presents a multispot distribution for low-NA M-SHFZP, but the intensity of high-order foci is effectively suppressed for high-NA M-SHFZP. The more the step number and the higher the NA, the stronger the ability of M-SHFZP to suppress higher-order foci. The results obtained by the VRS agree with the results obtained from the finite-different time-domain (FDTD) simulation basically.
1 citations