Fresnel zone
Mathematical Model for Equivalent Fresnel Zone Line of Sight Percentage Clearance for Terrestrial Point-to-Point Line-of-Sight Communication Link
... by Fresnel geometry [4-7]. In the Fresnel geometry for LOS links, the signal path are categorised into different Fresnel ...the Fresnel zones. However, the most important is the first ...
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Performance Analysis of Diffraction Gain (G (d) Due to presence of Knife-Edge as Compared to Free Space E- Field and Identifying the Position of Obstacle in a Fresnel Zone
... the Fresnel zones are defined on a plane passing through the midpoint of the line joining the source point to the field point, the field due to each Fresnel zone may be calculated ...the ...
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Periodic Transmission of Circular Binary Fresnel Zone Plates with Etching Depth and Substrate
... the Fresnel diffraction region, we obtain a simple analytical expression, which can be used to calculating the scattering intensity of deeply-etched circular binary Fresnel zone plates with a ...
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FDTD Analysis of Millimeter Wave Binary Photon Sieve Fresnel Zone Plate
... The amplitude of the radiation passing through a specific pinhole is given by its area, the phase by its position. Positions in front of light and dark rings differ in phase by π. As a rule amplitude photon sieve FZP ...
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Millimeter Wave Binary Photon Sieve Fresnel Zone Plate: FDTD Analysis
... that Fresnel zone plates (FZP) can be used to focus and image [1, ...as Fresnel zone plate, is in the order of the width of the outmost ...the zone plates helps to improve the spatial ...
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Millimeter wave imaging at up to 40 frames per second using an optoelectronic photo injected Fresnel zone plate lens antenna
... photo-injected Fresnel zone plate antenna (piFZPA) offers high speed, wide angle, precise beam steering with good beam quality, to enable video rate millimeter wave imagery with no moving ...
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Wideband High-Efficiency Fresnel Zone Plate Reflector Antennas Using Compact Subwavelength Dual-Dipole Unit Cells
... the Fresnel zone principle ...thickness. Fresnel zone plate (FZP) reflector antennas [8–10, 12–14], however, have lower efficiency and hence gained fewer applications in the ...
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Millimeter-Wave Offset Fresnel Zone Plate Lenses Characterization
... Fresnel Zone Plate Lenses (FZPLs) have been used in a wide range of the electromagnetic spectrum, from microwave [1, 2] to X-rays [3]. They are transparent-opaque lenses that filter the desire phase of the ...
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Tight focusing of laser light using a chromium Fresnel zone plate
... films sputtered on a quartz substrate has been numerically simulated using a FDTD-method [1]. A focal spot of subwavelength size FWHM=0.3λ was numerically demonstrated at distance z = 1.5 µm from the ZP, with the spot ...
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Broadband Polarization Gratings for Efficient Liquid Crystal Display, Beam Steering, Spectropolarimetry, and Fresnel Zone Plate.
... We also show preliminary experimental results of CPGs using polarization holography and liquid crystal materials and we summa- rize the Chapter with discussions on potential applications[r] ...
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The fabrication and testing of thick gold Fresnel zone plates for high energy x-ray and charged particle imaging
... TABLE OF CONTENTS SECTION PAGE Section 3.2 Results Section 3.2a - Test Experiments 58 59 100 keV X-ray Test Experiments Section 3.2b 6 MeV 10 MeV Proton Test Experiments and Section 3.3a[r] ...
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Comparative simulations of Fresnel holography methods for atomic waveguides
... Fresnel zone plates (FZPs) work by spatially modulating either the amplitude or phase of a light beam, resulting in interference of the optical field after propagation; by design of the modulated region one ...
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Comparative Study of Radius of Curvature of Rounded Edge Hill Obstruction Based on Occultation Distance and ITU-R 526-13 Methods
... first Fresnel zone is first ...first Fresnel zone from the obstruction ...the Fresnel zone is a function of frequency, the radius of curvature determined using the ITU-R 526-13 ...
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Performance Analysis on FZPL Antenna‟s to Enhance Spatial Resolution, Focusing Efficiency
... of Fresnel- Zone geometry and /approximate evaluation of the contribution of individual Fresnel- Zones to the total field, leads to the Fresnel theorem: the total field is just one-half that ...
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A solid state 94 GHz FMCW Doppler radar demonstrator for cloud profiling
... aperture Fresnel zone plate antennas can offer higher performance than Cassegrains of a similar size, for a fraction of the cost, albeit occupying a greater ...
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Path Profile for Terrestrial Line of Site Microwave Link in the C-Band
... At high frequencies such as the microwave frequencies, adequate planning is required to ensure line-of-site between the antennas at two distant communication link endpoints [1-5]. In this case, some factors must be taken ...
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Tight focusing of azimuthally polarized optical vortex produced by subwavelength grating
... The tight focusing of quasi-cylindrically polarized beams was previously investigated in detail in [13] using numerical analysis. It was shown that a deviation of an eight-sector beam does not exceed 5.3% from the ideal ...
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Untitled
... first Fresnel zone is totally ...the Fresnel zone criterion with regard to the reflecting wall and ...maximum Fresnel distance as we proceed outward along the ...
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Phase recovering algorithms for extended objects encoded in digitally recorded holograms
... The paper has presented two numerical methods for reconstructing large objects using a convolution method with an adjustable magnification based on the use of a virtual spherical reconstructing wave. The filtering is ...
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Evaluation of prediction accuracy for the Longley Rice model in the FM and TV bands
... The Longley–Rice model is a radio propagation model for predicting the attenuation of radio signals for a telecommunication link in the frequency range of 20 MHz to 20 GHz. The Longley-Rice model is also known as the ...
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