Hi folks, I did a system for a remote control using several types of radiation elements. It was hand held so the user interfered a lot with some types. The best, on both ends, was a loop around the periphery of the board, tuned to resonance with a capacitor. Feeding the beast was fun, try different things, like tapped capacitance works well. The systems we did trying to use a 1/4 wave got too much interference from the microprocessor on the receiving system. Good luck, dav0 David Lieby Siemens Med. USD, MVIS-S Andrew Burnside wrote: > Virenda > > Of course the dielectric underneath the antenna will effect your readings. > If you think about the path of the current, then there will be associated > field lines. > If you cut these field lines with anything, then you will change the > impedance. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu