I need to design a PCB trace antenna. I would like it to be centered (peak) about 20 MHz with a range of about 100 kHz to 200 MHz. I have spent hours searching online and can not find the information I need. I would like to calculate the impedance of a microstrip trace routed in a loop. The outside layer will be 1 oz finished (1.378 mils thick). The minimum trace width is 4 mils. The spacing to the next layer is 12 mils and will be a solid ground plane. I could void the area under the antenna if needed. The loop will be around a hole in the board that has a diameter of 0.720". The antenna could have a couple revolutions around the hole if needed. Thanks in advance for any help. Zach ------------------------------------------------------------------ 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