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Lutenna - The antenna made of Sugar
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<blockquote data-quote="casser" data-source="post: 593273" data-attributes="member: 264731"><p>humm..nobody comment, maybe nobody believe in a antenna made of sugar? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite13" alt=":-rofl2" title="roll on floor :-rofl2" loading="lazy" data-shortname=":-rofl2" /></p><p></p><p>I didint had time to translate my PDF about these antennas, so i will give a little explanation.</p><p></p><p>The idea came from Farragsat antennas, then i study a little a couple of articles on the internet..what i understand:</p><p></p><p>Luneberg invented this type of antennas in the 40´s, but he proposed that the antenna should have several layers of dielectric materials. The highest dielectric material should be at the surface of the antenna and the lowest should be inside of the antenna.</p><p></p><p>But building a antenna according to Luneberg theory it´s very hard because the need of several layer´s of materials. So i tried a one layer version..having a dielectric constant of 2.0 (Sugar in this case).</p><p></p><p>In a single layer version, the dielectric constant is what determines the focal point of the antenna, lower is the dielectric constant of the material..far is the focal point. But if the dielectric constant is 2.5, the antenna will not work, because the Focal point will be "inside" the antenna. A good around dielectric constant to medium size antennas should be between 1.6 and 2.2.</p><p></p><p>There are a lot of materials that can be used..sugar is one, dielectric foams should be perfect;)</p><p></p><p>There are a lot of versions:</p><p></p><p>-A full Sphere</p><p>-Half-Sphere</p><p>-Half-Shpere cutted (to reduce the volume of the antenna)</p><p>-Half-Sphere+conical Horn</p><p>-Half-Sphere+dielectric conical horn</p><p>-Half-Sphere+reflector </p><p>...</p><p></p><p>Make your own homemade multibeam high efficiency antenna using cooking materials<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue :p" loading="lazy" data-shortname=":p" /></p></blockquote><p></p>
[QUOTE="casser, post: 593273, member: 264731"] humm..nobody comment, maybe nobody believe in a antenna made of sugar? :-rofl2 I didint had time to translate my PDF about these antennas, so i will give a little explanation. The idea came from Farragsat antennas, then i study a little a couple of articles on the internet..what i understand: Luneberg invented this type of antennas in the 40´s, but he proposed that the antenna should have several layers of dielectric materials. The highest dielectric material should be at the surface of the antenna and the lowest should be inside of the antenna. But building a antenna according to Luneberg theory it´s very hard because the need of several layer´s of materials. So i tried a one layer version..having a dielectric constant of 2.0 (Sugar in this case). In a single layer version, the dielectric constant is what determines the focal point of the antenna, lower is the dielectric constant of the material..far is the focal point. But if the dielectric constant is 2.5, the antenna will not work, because the Focal point will be "inside" the antenna. A good around dielectric constant to medium size antennas should be between 1.6 and 2.2. There are a lot of materials that can be used..sugar is one, dielectric foams should be perfect;) There are a lot of versions: -A full Sphere -Half-Sphere -Half-Shpere cutted (to reduce the volume of the antenna) -Half-Sphere+conical Horn -Half-Sphere+dielectric conical horn -Half-Sphere+reflector ... Make your own homemade multibeam high efficiency antenna using cooking materials:p [/QUOTE]
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Lutenna - The antenna made of Sugar
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