05_边界与端口设置1.ppt

* Incident wave description. May skip over fairly quickly if no specific class interest. * Basic description of ideal circuit sources. Worth pointing out that voltage gap sources are very similar to “gap source ports” to be discussed later, but that those on this page provide no S-parameter output. * Effects of selecting Eigenmode model type is that sources are unavailable, as is Radiation boundary. Useful as a brief commentary; not worth spending significant time on. * Used for ferrite models only; may skip over fairly rapidly if no specific student interest. * We will now spend some time going into detail on each parameter in the port setup, as proper port assignment is vital to getting good HFSS results. The exercise will be continued following this examination. This particular slide can be passed over quickly, as it merely lists different errors that can be caused by inappropriate port assignment. * Criteria for selecting a standard vs. gap source type port. * First look at port sizing possibly including area ‘outside’ of the transmission line structure itself. This is a frequent point of confusion for those used to using circuit tools (or even our own Ensemble and Spicelink tools, where the ends of conductors are selected as ‘ports’ and ‘terminals’ with no other area designation). Additional sizing guidelines follow. * Examples of too-narrow and too-short ports to illustrate impact of sizing on solved fields. Specific sizing guidelines for different line types follow. * Microstrip sizing guidelines, standard ports. Note that the rule changes for ports in which the trace is narrower than the dielectric height. For these high impedance lines, the port outline should be proportional to the dielectric rather than to the line width. Instructor should caution that these are good ‘guidelines’ or ‘rules of thumb’ but not guaranteed in all cases. If the user is designing a rather non-standard transmission line structure, he or she should do a ports-only solu