File:Monopole and image antenna.svg
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Captions
Captions
Diagram of relation of a dipole and monopole antenna
Summary
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| Description |
English: Diagram showing why a monopole antenna has the same radiation pattern as a dipole antenna, with twice the radiated power. When a monopole antenna, (a) is mounted over a perfectly conducting ground plane such as the Earth, the radio waves can reach a given point P by two paths, either propagating directly in a straight line to P, or reaching P after first reflecting from the plane (blue) it has the same radiation pattern as it would if the ground plane were replaced with a virtual image antenna (b) located under the ground. The monopole and its image together are equivalent to a dipole antenna driven with a voltage twice as large as the monopole's (2V) but with the same element currents as the monopole. So the gain of the monopole will be twice that of the dipole |
| Date | |
| Source | Own work |
| Author | Chetvorno |
Licensing
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I, the copyright holder of this work, hereby publish it under the following license:
 
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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.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:53, 2 June 2021 | | 1,347 × 790 (26 KB) | Chetvorno (talk | contribs) | Added minor missing details: the direct rays from antenna to viewpoint, and current labels |
| 04:14, 8 May 2013 |  | 1,347 × 790 (30 KB) | Chetvorno (talk | contribs) | {{Information |Description ={{en|1=Diagram showing why a en:monopole antenna has the same en:radiation pattern as a en:dipole antenna, with twice the radiated power. When a monopole antenna, ''(a)'' is mounted over a perfectly co... |
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