File:Monopole and image antenna.svg
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Summary
| 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 |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
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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 | 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 | {{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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