en:antennas
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
en:antennas [2019/04/21 14:56] – [Other types of antennas] fluktuacia | en:antennas [2019/07/13 12:23] – [Patch antenna with a circular polarisation] fluktuacia | ||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ?? | ||
====== Antennas for Bolidozor network ====== | ====== Antennas for Bolidozor network ====== | ||
Line 35: | Line 36: | ||
===== Patch antenna with a circular polarisation ===== | ===== Patch antenna with a circular polarisation ===== | ||
- | This antenna was designed to improve the gain of the receiving system compared to a currently used GroundPlane antenna. Patch antenna does not have the zero in zenith and has an almost hemispherical radiation characteristics - that is why it is also sensitive to signals from objects flying directly over an observation site. Symmetric shape of its radiation pattern | + | This antenna was designed to improve the gain of the receiving system compared to a currently used GroundPlane antenna. Patch antenna does not have the zero in zenith and has an almost hemispherical radiation characteristics - that is why it is also sensitive to signals from objects flying directly over an observation site. Symmetric shape of its radiation pattern is also suitable for phase antennae fields, where there is necessary to optimise the sensitivity of antennae system for a specific type of observation. |
The following photos show the first build functional sample of a new patch antenna. | The following photos show the first build functional sample of a new patch antenna. | ||
Line 46: | Line 47: | ||
- | The functional sample underwent a measurement | + | The functional sample underwent a measurement |
- | Na funkčním vzorku bylo měřeno přizpůsobení můstkovou metodou. (??) | + | |
{{: | {{: | ||
Line 73: | Line 73: | ||
==== Preamplifier LNA01A ==== | ==== Preamplifier LNA01A ==== | ||
- | A good quality preamplifier is essential due to loses during signal propagation via antenna and due to low intensities of reflected signal. | + | A good quality preamplifier is essential due to losses |
- | [[http:// | + | [[http:// |
{{cs: | {{cs: | ||
{{cs: | {{cs: | ||
- | Preamplifier is therefore always installed in the immediate proximity of antenna in an plastic waterproof wiring box. | + | Preamplifier is therefore always installed in an immediate proximity of antenna in a plastic waterproof wiring box. |
Line 87: | Line 87: | ||
* [[http:// | * [[http:// | ||
* [[http:// | * [[http:// | ||
- | * [[https:// | + | * [[https:// |
en/antennas.txt · Last modified: 2019/07/13 12:27 by fluktuacia