Tesla, I apologize for the abruptness of my previous resonse, nor do I want to deter you from your interest in electromagnetics. However, it appears to me that you have a pirated copy of HFSS, which I do not condone. That, and my not having had my first cup of coffee, led to the tone of my first response. The answers to the questions that you are asking cannot be understood with a year of undergraduate level Emag. It requires another year of courses at the graduate level, and then you can answer them yourself. I recommend that you do that. Even with an adeqate educational background, HFSS can be...elusive. That is what the FAE's are for. If you do indeed have a registerd copy of the software, your first approach for these functional type of questions should be to contact Ansoft, not the List. Ken -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Tesla Sent: Friday, August 12, 2011 4:21 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Why discontinuity must be far away Wave Port excitation? Hi, experts In an application note of Ansoft hfss, it said geometrical discontinuity must be far away Wave Port. I think High-order modes due to discontinuity may affect the E and H field distribution leading to a wrong S-parameter. But Ansoft said Lumped Port can be used in this situation. but i think the E and H field of high-order modes also affect the current and voltage of "Lumped Port". so i assume it also lead to a wrong result. Thanks and Best Regards. ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu