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what's meant by coupling - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

Post subject: what's meant by coupling Posted: Mon Sep 12, 2005 4:58 am
i m an undergraduate and starting out in circuit analysis and design and hope to go on to do something in rf field 'cause i like it a lot. i've a very basic question to ask...when people talk about ac coupling capacitor, what they do really mean? exactly, what does coupling exactly mean? i know blocking cap blocks dc signal, bypass cap open circuits the dc signal but i'm not exactly sure what's meant by dc coupling or ac coupling.

any explanation w/ or w/o example will help a lot! thanx


Post subject: Posted: Mon Sep 12, 2005 6:03 am

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Coupling means how much the signal will pass forward from one point to another. AC coupling is done by means of series capacitor. As the frequency increases the reactance of the capacitor drops, according to the ratio of Xc=1/2*pi*f*C.

Best regards,

- IR


Post subject: Posted: Mon Sep 12, 2005 6:37 pm
hi IR, this means that a series capacitor that is used for ac coupling is then also a dc block??


Post subject: Posted: Mon Sep 12, 2005 11:30 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany

Best regards,

- IR


Post subject: Posted: Wed Sep 14, 2005 1:33 am
you can say DC coupling is the same as High Pass Filter.
It will blocked the DC and the lower Freq. and pass the higher freq.

the 3 dB point for this filter depend on the capacitor and the impedance.[/img]

Posted  11/12/2012
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