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 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
