project:hgg:antenna_design:omidirectional
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende Überarbeitung | ||
project:hgg:antenna_design:omidirectional [2012-01-01 04:05] – 85.179.243.149 | project:hgg:antenna_design:omidirectional [2012-03-26 09:16] (aktuell) – alte Version wieder hergestellt 85.214.34.41 | ||
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- | ======= More Gain ======= | + | ====== More Gain ====== |
- | I found out that comercial antennas with high gain often are very long like in 1.2 to 3.5 Meters. In the antenna Manuals (eg see [[http:// | + | I found out that comercial antennas with high gain often are very long like in 1.2 to 3.5 Meters. |
+ | |||
+ | Omni antennas by definition offer 0 dB gain (1). | ||
+ | |||
+ | To generate higher gain, one must increase the directionality of the antenna, and therefore make it directional (ie not omni directional). | ||
+ | |||
+ | The gain of the antenna is given by: | ||
+ | |||
+ | G = η(πD/ | ||
+ | |||
+ | Where: | ||
+ | η = efficiency (0.65 good initial value) | ||
+ | D = Diameter | ||
+ | λ = wavelength of signal being received/ | ||
+ | |||
+ | In the antenna Manuals (eg see [[http:// | ||
It's not clear if that also works for groundplane antennas. | It's not clear if that also works for groundplane antennas. | ||
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- | ===== Link-Dump ===== | + | ====== Link-Dump |
[[http:// | [[http:// |
project/hgg/antenna_design/omidirectional.1325387148.txt.gz · Zuletzt geändert: 2012-01-01 04:05 von 85.179.243.149