File:Braun phased array antenna 1905.png
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Braun_phased_array_antenna_1905.png （436 × 343像素，文件大小：8 KB，MIME类型：image/png）
摘要
| 描述 |
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. |
| 日期 | |
| 来源 | 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 |
| 作者 | Karl Ferdinand Braun |
许可协议
|
本作品在其来源国以及其他著作权期限是作者逝世后70年或以下的国家和地区属于公有领域。 |
| 本文件已被确认为免除已知的著作权法限制（包括所有相关权利）。 | |
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| 当前 | 2017年1月15日 (日) 05:49 | | 436 × 343（8 KB） | Chetvorno | User created page with UploadWizard |
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