The square antenna inductance equations in app notes AN2972 and AN2866 seem to contain an error (or misleading terms) where it describes the average diameter parameter. The notes say the average diameter in millimeters but it needs to be in meters instead
Looking at things from a units perspective, it's clear that d is expected to have units of m since u0 has units of H/m and all the other quantities are dimensionless. Also, since all the other parameters are dimensionless, the notes on the p parameter can eliminate the "in millimeters" text. It may also be good to duplicate the u0 value for the Inductance of squared antennas calculation. It is repeated in 4.2 (inductance of spiral antenna) from 4.1 (inductance of circular antenna). Not having it present in 4.3 may incorrectly suggest that the value should be different.
App Note Links: AN2972 and AN2866
