(Boswell et al 2005) discussed a small transmitting loop (STL) and offered predictions and measurements of performance.
Boswell’s loop is 1m diameter of 22mm diameter copper tube.
This article is a reconciliation of Calculate efficiency of vertically polarised antenna from far field strength with Boswell’s predictions, measurements and efficiency calculations.
Above, Fig 6 from Boswell shows his prediction of the field strength of a 100% efficient loop at several distances, and measured field strength. He calculated efficiency from the difference between predicted lossless and measured. Continue reading Reconciliation of field strength to efficiency calculator with Boswell’s loop measurements