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One simple question about RF circuit
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tony_taoyh



Joined: 20 Oct 2004
Posts: 141
Helped: 3
Post29 Aug 2005 8:26   

One simple question about RF circuit
In some schematice for Rf circuits,

there is some strange flag, as shown in the attached schematics.
(PDF format)

I think it should be:
1) Bypass cap,

2) Parasitic Cap in PCB and PAD lead.


I never meet this kind of schematice.

Thanks a lot.

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Borber



Joined: 01 Jan 1970
Posts: 1561
Helped: 117
Location: Slovenia
Post29 Aug 2005 9:21   

Re: One simple question about RF circuit
This is feedthrugh capacitor. It's purpous is to effectively block or filter RF to escape metal enclosure. In simplest form it is only capacitor and can be made as a PI or T filter.
Atached is a picture of one of the types of feedthrough capacitor.

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tony_taoyh



Joined: 20 Oct 2004
Posts: 141
Helped: 3
Post29 Aug 2005 11:47   

Re: One simple question about RF circuit
I appreciate your kindly help.

I also found some detailed materials for it.
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Post29 Aug 2005 11:47   

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mircea



Joined: 07 Sep 2005
Posts: 40
Helped: 2
Location: Romania
Post08 Sep 2005 9:13   

One simple question about RF circuit
The short version: it is sort of a decoupling capacitor.
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