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navigation_gps:gps_antenna_signal_splitter [2016/12/17 11:01]
kjeld
navigation_gps:gps_antenna_signal_splitter [2016/12/19 15:25] (current)
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 {{ :​navigation_gps:​capacitor_reactance_at_l1l2.png?​nolink&​500 |}} {{ :​navigation_gps:​capacitor_reactance_at_l1l2.png?​nolink&​500 |}}
  
-In the real world capacitors are not ideal however, the construction and external leads add inductive and resistive components. This causes a number of complications,​ one of them being that capacitors have a series self-resonant frequency (SRF) due to parasitic inductance((http://​www.ti.com/​lit/​an/​sloa069/​sloa069.pdf)).+In the real world capacitors are not ideal however, the construction and external leads add inductive and resistive components. This causes a number of complications,​ one of them being that capacitors have a series self-resonant frequency (SRF) due to parasitic inductance((http://​www.ti.com/​lit/​an/​sloa069/​sloa069.pdf)).
  
-* At frequencies below the SRF the impedance is primarily capacitive. +  ​* At frequencies below the SRF the impedance is primarily capacitive. 
-* At the SRF the capacitive and inductive components cancels each other leaving only the resistive component which is typically stated in the data sheets as Equivalent Series Resistor (ESR). +  * At the SRF the capacitive and inductive components cancels each other leaving only the resistive component which is typically stated in the data sheets as Equivalent Series Resistor (ESR). 
-* Above SRF the impedance is primarily inductive.+  * Above SRF the impedance is primarily inductive.
  
 In theory the lowest resistance at a working frequency would be obtained by selecting a capacitor with a SRF at this frequency. But since capacitor values are not accurate, SRF should be higher than the working frequency to avoid inductive properties. In theory the lowest resistance at a working frequency would be obtained by selecting a capacitor with a SRF at this frequency. But since capacitor values are not accurate, SRF should be higher than the working frequency to avoid inductive properties.