Design of Multilayer Spiral Coils with Different Geometries to Determine the Inductance

Nowadays more and more electronic and electrical devices contain spiral coils made in planar technology. Thus, the transition from single layer to multi-layer spiral coils is inevitable. The purpose of this paper is to determine the inductance of multilayer spiral coils of different geometries (square, circular, hexagonal and octagonal) and configurations that produce much higher performance. The use of multilayer spiral coils allows a flexibility to choose the desired size with the possibility to change both the number of turns and the number of layers. Therefore, by comparing numerous coil configurations presented in this paper, the correctness of the proposed solutions for determining the inductance of multilayer spiral coils was demonstrated by numerical modeling, experimental measurements and analytical calculations starting from monolayer spiral coils, where the inductance calculation was based on the formula developed by researcher S.S. Mohan using fundamental principles of electromagnetism.