Hi All
In the quasistatic view, in the middle of the test region GTEM field lines are directed from inner (septum) to outer (floor) conductor, bending towards the walls near the septum edges in a capacitive fringing sense. The field distribution is frequency-dependent, so other polarizations may be observed. Some TEM waveguides and GTEMS are tilted or have multiple inner conductors, so vertical and horizontal designators are specific to conventional GTEMs. For immunity testing both anechoic chamber and TEM waveguide methods are based on a plane wave field distribution before the EUT is inserted. A TEM mode field pattern is more similar to vertical polarisation in an anechoic chamber, while in a chamber the field pattern in horizontal polarisation is more prone to distortion caused by ground plane reflections. In the usual emissions 3-position GTEM-to-OATS conversion method, a single GTEM polarization is assumed and OATS-vertical, -horizontal, and free-space radiation are simulated. Best Regards Tim Harrington -----Original Message----- From: Aschenberg, Mat [mailto:[email protected]] Sent: Friday, January 12, 2001 12:02 PM To: [email protected] Subject: GTEM Stuff Here is another specific question dealing with GTEM - OATS correlation. Is a GTEM cell horizontally or vertically polarized? Thanks for your help, Mat ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
