File:Radio Antenna Engineering-Fig3-77.png
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| Description |
English: Figure 3.77: Horizontal rhombic antenna (common three-wire form). This is a directional wire antenna used on the MF and HF bands. It consists of one to three wires in a rhombus (diamond) shape, suspended high above the ground from poles or towers at the corners of the rhombus, with insulators. The antenna is fed through a balanced transmission line at one end of the rhombus, and terminated in a resistance at the other end. In the above rhombic the termination is not a resistor but a dissipative transmission line. The main lobes of the radiation pattern are off the sharp ends of the rhombus.
Français : Une antenne horizontale rhombique à 3 fils. |
| Date | |
| Source | Retrieved from Edmund A. Laport, Radio Antenna Engineering, McGraw-Hill Publishing Co., New York, 1952 on David Platt's webpage for this book |
| Author | Edmund A. Laport |
| Permission (Reusing this file) |
The copyright for this book Radio Antenna Engineering should have been renewed in 1980. A search of the US Copyright Office online database covering 1978 to the present shows no copyright renewal for that author name or title. Therefore the copyright was not renewed and the book is in the public domain. See David Platt's webpage for further copyright researches which confirm this. |
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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.
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| current | 11:42, 31 August 2009 | | 3,198 × 2,346 (63 KB) | Radio User (talk | contribs) | {{Information |Description={{en|1=Figure 3.77: Horizontal rhombic antenna (common three-wire form). }} |Source=Radio Antenna Engineering |Author=Edmund A. Laport |Date=1952 |Permission= |other_versions= }} [[Category:Radio Antenna Engineering (1952 book) |
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