Classically I've used Lambda over two Pi. But I guess it's worth considdering that there is near field, transition region, and far field.....
Thoughts? [email protected] wrote on 4/29/2004, 9:08 AM: > > What should our definition of near/far field be? My somewhat arbitrary > definition for this case is where the fall-off in the E-field deviates > by 1 dB from 20LOG(D/d). A better definition might be some deviation in > the 377 ratio of E-to-H. I think I can mimic a dish by properly phasing > many dipoles in NEC. Any comments on whether this is a valid method to > determine the near/far field? > > Dave Cuthbert > Micron Technology > > -----Original Message----- > From: Wan Juang Foo [mailto:[email protected]] > Sent: Thursday, April 29, 2004 12:31 AM > To: drcuthbert; [email protected] > Subject: RE: Near field/far field calculation > > > > > > > > Dave and all, > That is a wire antenna. The far field is based on a different criteria. > > :-) > > Tim Foo > > [email protected] wrote on 27/04/2004 11:44 PM > > I ran a NEC simulation to make some sense of this. > > This is too big of a reflector for NEC to handle > > so I made a large rhombic. The rhombic is 1 > > meter by 1/2 meter. The receive antenna is a dipole. > > I moved the dipole in from 80 meters 1/2 distance steps. <snip> > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ieee-pses.org/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > -- Derek N. Walton L F Research Poplar Grove, IL 61065, USA This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
