Recent Progress on Microwave Applications of Nonreciprocal Metamaterials using Yttrium Iron Garnet Ferrites

Abstract

This paper reviews recent progress on nonreciprocal metamaterials using yttrium iron garnet ferrites in the microwave region and their applications to resonators and leaky wave antennas. By using the nonreciprocal metamaterials, size-free pseudo-traveling wave resonators with arbitrarily tunable phase-gradient of field distribution are realized and implemented to beam scanning antennas. The resonant mechanism of the antennas helps themselves reduce beam squint without loss of beam scanning functionality and gains higher efficiency.