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en:antennas [2019/05/01 06:02]
fluktuacia
en:antennas [2019/07/13 12:27] (current)
fluktuacia
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-?? 
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 ====== Antennas for Bolidozor network ====== ====== Antennas for Bolidozor network ======
  
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 ===== 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 ​(?? 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. 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|}} {{:​cs:​antennas:​patchant_freq_char.png?​200|}}
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 A good quality preamplifier is essential due to losses 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 a 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_plast16.jpg?​direct&​300 | }}
en/antennas.1556690522.txt.gz · Last modified: 2019/05/01 06:02 by fluktuacia