Operation of a Gyromagnetic Line with Magnetic Axial Bias

A growing interest has been raising around the use of nonlinear transmission lines (NLTLs) for radiofrequency (RF) generation since recent results published has demonstrated great prospects for this application. The subject of this paper is about a continuous ferrite loaded nondispersive line known as a gyromagnetic nonlinear transmission line (GNLTL), biased by an axial magnetic field. This type of transmission line has demonstrated a high RF conversion efficiency (up to 20.0%), showing a good capability of operation in a broader frequency range, between 300 MHz and 6.0 GHz. Several authors used different approaches to study the gyromagnetic effect to understand the precession movement of the ferrite magnetic dipoles. The model proposed and studied here to analyze the GNLTL has a coaxial structure using NiZn ferrite beads distributed in a 20-cm coaxial line at a high voltage operation. Signal results were compared to check the influence of a solenoid on the axial magnetic bias. This paper explores the oscillations generated at the output caused by the changes in the magnetic system setup. It is expected that the discussion presented here will be useful as a basis to develop a new system capable of generating RF for mobile defense platforms.