Material, apparatus and method for radio frequency circulator and isolator under resonant

摘要

To provide materials, devices and methods related to under-resonance radio frequency (RF) circulators and isolators.SOLUTION: In some embodiments, a circulator (200) may include a conductor having a plurality of signal ports (204, 206, 208) and one or more magnets configured to provide a magnetic field. The circulator may further include one or more ferrite disks (100) implemented to the conductor and the one or more magnets so that an RF signal may be selectively routed among the signal ports by the magnetic field. Each ferrite disk includes a synthetic garnet material having dodecahedron, octahedron and tetrahedron sites, with bismuth occupying at least some of the dodecahedron sites and with aluminum occupying at least some of the tetrahedron sites. The synthetic garnet material can be represented by a formula of YBiCaFeVZrAlO. In some embodiments, x≤1.4, y≤0.7, z≤0.7, and a≤0.75 are satisfied.SELECTED DRAWING: Figure 4