And also the circumference of the element. And, Yes, wave velocity is certainly different in mediums other than vaccum affected by permeability and permitivity. Engineering Manager BACL 230 Commercial Street Sunnyvale CA 94085 USA 408-732-9162 x38 408-732-9164 fax
----- Original Message ----- From: "Luke Turnbull" <[email protected]> To: <[email protected]>; <[email protected]> Sent: Wednesday, October 29, 2003 2:07 AM Subject: Re: Effective length of half wave dipole > > I assume you are referring to the fact that the length of a practical antenna is about 95% of the theoretical length. > > One significant influence is the end capacitance of a thick dipole, effectively caused by the electric field fringing from the sides of the element round to the end. > > Hope this helps, > > Luke Turnbull > > >>> <[email protected]> 10/29/03 08:59am >>> > > > Dear all > > I got confused with the effective length of a half wave dipole. > > 1) It is due to non-constant current distribution, or > > 2) It is due to the wave velocity in materials different from that in > vacuum. > > > What do you think which one is correct? > > Regards > KC Chan > > > > > > > > > > > > > > > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > 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] > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > 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] > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ 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] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
