File:Braun phased array antenna 1905.png
Braun_phased_array_antenna_1905.png (436 × 343 pixels, file size: 8 KB, MIME type: image/png)
Captions
Captions
Summary
[edit]DescriptionBraun phased array antenna 1905.png |
English: First experimental phased array antenna, invented by Karl Ferdinand Braun in 1905 in Strasbourg, Germany. This was a 3 element array antenna which transmitted a beam of radio waves whose direction could be rotated electronically to 3 directions 120° apart. It consists of 3 monopole antennas at the corners of an equilateral triangle whose bisector is a quarter wavelength long. Two of the antennas are fed in phase but a quarter wave phase delay can be switched into the feed line of one. Braun won the Nobel Prize in Physics in 1909 for his radio work. Phased arrays are now widely used in radar and many other applications. |
Date | |
Source | Retrieved January 14, 2017 from Karl Ferdinand Braun (December 11, 1909) Nobel Lecture: Electrical oscillations and wireless telegraphy, nobelprize.org Nobel Media AB, p. 230, fig. 14. Credited on site to Nobel Lectures: Physics 1901 to 1921, Elsevier Publishing Co., Amsterdam, 1967 |
Author | Karl Ferdinand Braun |
Licensing
[edit]Public domainPublic domainfalsefalse |
![]() |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 05:49, 15 January 2017 | ![]() | 436 × 343 (8 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
The following 4 pages use this file:
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on zh.wikipedia.org
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.
Horizontal resolution | 28.35 dpc |
---|---|
Vertical resolution | 28.35 dpc |
File change date and time | 02:02, 15 January 2017 |