I. Introduction
Inductor is a very popular device in various electronic circuits. The PCB (printed circuit board) planar inductor is printed directly on the PCB board, with copper track as the turn of its windings. Some researches about it have been made on the designing, calculation as well as its applications, as in [1], [2]. However the studies of some electromagnetic aspects of it have not been found. In this paper, the electromagnetic radiations of a PCB planar inductor are discussed.