Patent ID: 7362195
Filing Date: 2008-04-22
Classification: H01P

Abstract:
1. A directional R.F. circulator for directing a radio frequency signal which does not require an external magnetic field, the circulator comprising: layers of ferromagnetic materials and an insulator forming a laminated structure, said layers each having a thickness that is less than a wavelength of said radio frequency signal and a skin depth of said radio frequency signal, said ferromagnetic materials and insulators forming a resonant cavity having a resonant frequency defined by an effective magnetic susceptibility and an effective dielectric constant of the laminated structure; a first connector for supplying the radio frequency signal to said laminated structure so that a magnetic field is in a plane of said laminated structure and an associated electric field is perpendicular thereto; a second connector connected to said laminated structure that couples a signal traveling in a first circular direction to an external circuit; and a third connector connected to said laminated structure that couples another signal traveling in a second circular direction to a different external circuit.