Hi To plot a smith chart,requires a selection of at least one Y column of values (or a range from at least one column). If the Y column(s) has an associated X column, then the X column supplies the X values. Otherwise, the worksheet's default X values are used. The attached files are simple examples of smith chart.
If you still have problems,Please send your data to Tech@originlab.com. Thanks
Smith chart was introduced to Origin in the version 7.0. If your Origin is an older version, you need to upgrade. You can try it out with the evaluation version of Origin 7.5. (http://www.originlab.com/index.aspx?s=12&lm=62 )