How does changing factors like driving frequency, core diameter, and core length affect the inductive reactance of an inductor?

Abstract

In the Information Age, we can not live without wireless devices. Wireless devices such as WiFi, telephones, radio, and Bluetooth improve the way humans interact with technology. When we make phone calls, our phones emit specific electromagnetic waves to a receiver or base station. To receive the desired frequency, a filter is required to eliminate unwanted frequencies. An inductor-capacitor (LC) filter and inductor-resistor (LR) filter are two very common filters which use an inductor (and capacitor or resistor) to filter electromagnetic noise. When an alternating current is applied to an inductor the back electromotive force (EMF) produced by the inductor will change accordingly. The back EMF opposes the supplied voltage and the flow of current is limited. According to theory, the inductor’s opposition to the flow of current increases with the driving frequency. In this way, the circuit can remove the unwanted frequency components. Here we investigate the effect of different driving frequencies of alternating current, coil diameter and coil length on the inductive reactance of an inductor. We discovered that changing factors like frequency, coil diameter, and coil length can lead to the changes in the inductance of an inductor as well as the induced voltage produced by the inductor. As the inductance of the inductor changes, the inductive reactance varies as well as the effect of the inductor on preventing certain frequencies of alternating current. In the process of the investigation, we will proceed both experimentally and theoretically, comparing the results. Our results demonstrate under what circumstances the inductive reactance has the largest value and this value can play a key role in preventing the effect of electromagnetic noise on wireless systems.