Ferrite Antennas for A.M. Broadcast Receivers

Abstract

The design of a broadcast receiver requires consideration of the type of antenna to be used such that the best performance of the system is maintained. In the past, the use of a built-in air loop antenna was common in the design of home receivers and some portables. However, the effectiveness of this type of antenna decreases with its decrease in dimensions. Today, with the widespread use of transistors and the remarkable trend of appreciation of compact devices on the part of the customer, the use of such antenna has been replaced by the use of the ferrite loop antenna. The ferrite rod concentrates in a small area the magnetic flux from a large area, thus reducing the dimensions of the antenna.