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Suitable capacitor for GHz Rectifier

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simazafrani

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Hi...
i'm doing rectifier for GHz application...my problem is finding suitable capacitor for the rectifier circuit...Previously, i used through hole ceramic capacitor and its operates well for frequency below than 1GHz, however for higher frequency the results are not ok.

i'm looking for smd/smt capacitor..but not sure how to choose...becoz from some datasheets i read..most of them just show that they are working well for frequency up to 10MHz only...
working voltage are around 1-25V

hope u guys can suggest capacitors that work for GHz application...tq :)
 

simazafrani said:
Hi...
i'm doing rectifier for GHz application...my problem is finding suitable capacitor for the rectifier circuit...Previously, i used through hole ceramic capacitor and its operates well for frequency below than 1GHz, however for higher frequency the results are not ok.

i'm looking for smd/smt capacitor..but not sure how to choose...becoz from some datasheets i read..most of them just show that they are working well for frequency up to 10MHz only...
working voltage are around 1-25V

hope u guys can suggest capacitors that work for GHz application...tq :)
Click to expand...

To make things simple, after the low-pass filter connect a 1 nF SMD capacitor. Most of such SMD caps can be used above 2...3 GHz without problems. If you need, connect larger capacitors in parallel with this one. If you need thru-hole caps, find the type used in TV tuners , most of them do work above 2 GHz, too. (solderable types). Make the shortest possible connection from the rectifier to the center conductor.
 
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