File:Monopole measured input resistance graph.svg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (SVG file, nominally 683 × 808 pixels, file size: 112 KB)

Captions

Captions

Graph of measured input resistance of a monopole antenna

Summary

[edit]
Description
English: Graph of the measured input resistance of a monopole antenna fed at bottom mounted over a large wire screen ground plane as a function of length of the antenna in wavelengths for different values of the length-to-diameter ratio of the element. The horizontal axis of the graph is the electrical length of the antenna, the length divided by the wavelength of the radio frequency input multiplied by 360 degrees. For all practical purposes the vertical axis of the graph is the radiation resistance of the monopole; as the ohmic resistance of the rod was negligible. The cylindrical rod antenna was fed at bottom from under the screen by coaxial cable from a signal generator, and a slotline was used to determine the SWR and thus the input impedance. This was a large experiment in which many different lengths and diameters of rod were used determine the shape of the impedance curve. This parameter needed to be determined experimentally since, particularly near the half-wave resonance, it was difficult to calculate; the numerical algorithms used to analyze antennas have large errors near the resonance.
Date
Source Retrieved 23 November 2024 from Brown, George H. & Woodward, O. M.. "Experimentally determined impedance characteristics of cylindrical antennas", Proceedings of the IRE, Institute of Radio Engineers, New York, Vol. 33, No. 4, April 1945, p.259, fig.6 on https://www.worldradiohistory.com/. The downloaded PDF graph was traced in Inkscape to make an SVG version
Author

Original version: George H. Brown

This version: User:Chetvorno
Permission
(Reusing this file)		 This magazine published in the US in 1945 would have the copyright renewed in 1973. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here [1]. Search of the Renewals for Periodicals for 1972, 1973 and 1974 show no renewal entries for Proceedings of the IRE. Therefore the work's copyright was not renewed and it is in the public domain.
Other versions This is a companion of Monopole measured input reactance graph.svg. The color coding of the different length-to-diameter lines in the two graphs is the same to allow the resistance and reactance to be compared.
SVG development
InfoField
 
The SVG code is valid.
 
This diagram was created with Inkscape.
 
 This diagram uses embedded text that can be easily translated using a text editor.

Licensing

[edit]
Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

Flag of the United States
Flag of the United States

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current21:43, 17 December 2024Thumbnail for version as of 21:43, 17 December 2024683 × 808 (112 KB)Chetvorno (talk | contribs)Changed colors to make them stand out more
21:22, 10 December 2024Thumbnail for version as of 21:22, 10 December 2024668 × 793 (107 KB)Chetvorno (talk | contribs)Changed top axis labels to fractions of a wavelength for better comprehension
07:59, 10 December 2024Thumbnail for version as of 07:59, 10 December 2024671 × 793 (114 KB)Chetvorno (talk | contribs)Increased thickness of graph lines
10:52, 30 November 2024Thumbnail for version as of 10:52, 30 November 2024671 × 793 (115 KB)Chetvorno (talk | contribs)Uploaded a work by George H. Brown from Retrieved 23 November 2024 from [https://www.worldradiohistory.com/Archive-IRE/40s/IRE-1945-04.pdf Brown, George H. & Woodward, O. M.. "Experimentally determined impedance characteristics of cylindrical antennas", ''Proceedings of the IRE'', Institute of Radio Engineers, New York, Vol. 33, No. 4, April 1945, p.259, fig.6] on https://www.worldradiohistory.com/ with UploadWizard

You cannot overwrite this file.

There are no pages that use this file.

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Monopole_measured_input_resistance_graph.svg&oldid=971616745"