File:Monopole 3d radiation pattern 1.2 wavelength.png
Monopole_3d_radiation_pattern_1.2_wavelength.png (490 × 470 pixels, file size: 45 KB, MIME type: image/png)
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Summary
[edit]DescriptionMonopole 3d radiation pattern 1.2 wavelength.png |
English: Three dimensional far field radiation pattern of a 1.2 wavelength vertical monopole antenna over a perfectly conducting infinite ground plane. Monopole antennas over 0.625 wavelength are not often used because the direction of maximum radiation is not horizontal but directed up into the sky. The graph is axially symmetric about the antenna's vertical axis, and is resting on the ground plane. The origin of the coordinates is where the axis intersects the ground plane. The distance of the surface from the origin in any direction is proportional to the magnitude of the electric field (signal strength) radiated in that direction. From dipole equation in Balanis, 2005, Antenna Theory 3rd Ed. p.172, eq. 4-62a |
Date | |
Source | Own work |
Author | Chetvorno |
Generated by GNU Octave program:
# mpole3d.m # length = length of element in wavelengths #-------------------------------------------- function mpole3d (length) thetasamples = 100; #theta resolution phisamples = 100; #phi resolution colormap bone; #colorscheme [theta,phi] = meshgrid(linspace(0,pi./2,thetasamples), linspace(0,2.*pi,phisamples)); #creates grid kl = 2 .* pi .* length; #length in radians r = (cos(kl .* cos(theta)) - cos(kl)) ./ sin(theta); #Directivity equation r = r .* sign(r); #fix - make signal strength positive x = r.*sin(theta).*cos(phi); #maps grid onto radiation surface y = r.*sin(theta).*sin(phi); z = r.*cos(theta); surfl(x,y,z); #creates a smooth solid surface with specular reflections shading interp #continuous shading hides wireframe axis("equal", "tight", "off"); #same scale factor, no padding, turn off axes view(-37,15); #Lowered viewpoint so can see structure better xlim("tight"); ylim("tight"); zlim("tight"); print -dpng mpole3dpattern.png; #save image in file endfunction
Licensing
[edit]This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:11, 7 December 2024 | 490 × 470 (45 KB) | Chetvorno (talk | contribs) | Uploaded own work with UploadWizard |
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Horizontal resolution | 118.11 dpc |
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Vertical resolution | 118.11 dpc |
File change date and time | 10:57, 6 December 2024 |