Differences

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--- en:antennas [2019/04/21 14:55] – [Patch antenna with a circular polarisation] fluktuacia
+++ en:antennas [2019/07/13 12:27] (current) – fluktuacia
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 ====== Antennas for Bolidozor network ======
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 ===== 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 (?? vyzařovací charakteristika) is also suitable for phase antennae fields, where there is necessary to optimise the sensitivity of antennae system for a specific type of observation.
+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.
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-The functional sample underwent a measurement
+The functional sample underwent a measurement of reflection using a Return Loss Bridge method.
-Na funkčním vzorku bylo měřeno přizpůsobení můstkovou metodou. (??)
 {{:cs:antennas:patchant_freq_char.png?200|}}
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 ===== Other types of antennas =====
-An interesting antenna design, that should solve the drawbacks of GP antennas is so-called [[http://on6wg.pagesperso-orange.fr/Doc/Antenne%20Eggbeater-Engl-Part1-Full.pdf|eggbeater]] or an antenna of [[http://en.wikipedia.org/wiki/Turnstile_antenna|Turn style]] type.
+An interesting antenna design, that should solve the drawbacks of GP antennas is a so-called [[http://on6wg.pagesperso-orange.fr/Doc/Antenne%20Eggbeater-Engl-Part1-Full.pdf|eggbeater]] or an antenna of [[http://en.wikipedia.org/wiki/Turnstile_antenna|Turn style]] type.
-A pair of crossed dipoles above a conducting plane could also result in interesting experimental solutions as it would be probably possible to integrate the amplifier directly into the antenna. The resulting active antenna would have better noise parameters and reliability compared to design with separated GP antenna and LNA.
+A pair of crossed dipoles above a conducting plane could also result in interesting experimental solutions as it would be probably possible to integrate an amplifier directly into an antenna. The resulting active antenna would have better noise parameters and reliability compared to design with a separated GP antenna and an LNA.
-[[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also be tested for receiving the reflected signal. Although it works, it has an disadvantage of high bandwidth, that causes a penetrations of undesirable signals.
+[[http://en.wikipedia.org/wiki/Discone_antenna|Discone antena]] has also been tested for receiving the reflected signal. Although it works, it has an disadvantage of wide bandwidth, that causes a penetrations of undesirable signals.
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 ==== 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 during signal propagation via antenna and due to low intensities of reflected signal.
-[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is a preamplifier designed for meteor detection in 2m band. Its benefit is mainly in amplification of signal from antenna (thus decreasing the influence of antenna’s lead (?? svod antény) and the noise from receiver). Furthermore it reduces complications connected to signal radiation from receiver’s oscillator.
+[[http://www.mlab.cz/Modules/CommRF/LNA01A/LNA01A_Bottom_Small.JPG|LNA01A]] is a preamplifier designed for meteor detection in 2m band. Its benefit is mainly in amplification of signal from antenna (thus decreasing the influence of antenna’s lead and a noise from receiver). Furthermore it reduces complications connected to signal radiation from receiver’s oscillator.
 {{cs:antennas:gp_plast16.jpg?direct&300 | }}
 {{cs:antennas:gp_plast17.jpg?direct&300 | }}
-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.
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   * [[http://www.qsl.net/kd2bd/splat.html|RF Signal Propagation, Loss, And Terrain analysis tool for the electromagnetic spectrum between 20 MHz and 20 GHz.]]
   * [[http://en.wikipedia.org/wiki/Numerical_Electromagnetics_Code|NEC2 software]]
-  * [[https://github.com/BogdanDIA/nec2-array|Antenna field in v NEC2]]
+  * [[https://github.com/BogdanDIA/nec2-array|Antenna field in NEC2]]