The quotation below is a little out-of-context. In the previous statement in that post, it says, " ...the point ... is that no test-type antenna is a high ³Q² device."
It is true that a tuned loop can be a very high "Q" antenna, but these are designed solely for communications. No one uses such antennas for EMI testing, precisely because of the sharp tuning involved. And if one were to do so, presumably with a knowledge of the antenna's behavior, the antenna factor would be properly characterized at the frequency (ies) of operation, and not missed because the tuned frequency was interpolated between two untuned frequencies. Ken Javor Phone: (256) 650-5261 > From: John Woodgate <[email protected]> > Date: Wed, 7 Dec 2011 04:52:25 +0000 > To: <[email protected]> > Subject: Re: [PSES] Calibration practice for EMI test transducers > > In message <cb03ef45.c9421%[email protected]>, dated Tue, 6 > Dec 2011, Ken Javor <[email protected]> writes: > >> Antennas can have arbitrarily high gains, depending on construction, >> but the high gain is a geometrical quality, not a high quality factor >> in the frequency domain. > > True for electric antennas, I think, but not for magnetic. Tuned loops > and ferrite-rod antennas can have high Q. CISPR 16 includes at least one > magnetic antenna, although it may well not be high Q. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > Some people who are peeling the finch of the financial crisis are thinking of > biting a rook. > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
