Dielectric waveguide ferrite resonance isolator

In a dielectric waveguide ferrite resonance isolator capable of operating in the millimeter wave frequency range in a dielectric waveguide transmission line wherein said isolator comprises a thin rectangular substate of about 0.005 inch thick of barium oxide substituted NiCo ferrite affixed to the side of dielectric waveguide composed of alumina by means of a low electrical loss epoxy type adhesive and wherein the height of the rectangular ferrite substrate is the same as the height of the dielectric waveguide, and wherein the hexagonal ferrite material is then placed between the pole pieces of an electromagnet in order to magnetize and fully orient the ferrite material, the improvement of positioning a grooved block of dielectric having a low dielectric constant and high thermal conductivity against the face of the hexagonal ferrite so as to use the high thermal conductivity dielectric as a heat sink thereby extracting heat from the hexagonal ferrite.

In a combined broadband isolator wherein a series of thin rectangular substrates of hexagonal ferrite material is affixed on the side wall of a dielectric waveguide with equal spacing between each substrate, and with each of said ferrite substrates functioning over different but contiguous frequency bands, the improvement of positioning a grooved block of dielectric having a low dielectric constant and high thermal conductivity against the face of each hexagonal ferrite material so as to use the high thermal conductivity dielectric as a heat sink thereby extracting heat from each hexagonal ferrite.

In a dielectric waveguide transmission line containing a dielectric waveguide ferrite resonance isolator therein capable of operating in the millimeter wave frequency range wherein said isolator comprises a thin rectangular substrate of hexagonal ferrite material that has been affixed to a side of the dielectric waveguide and then placed between the pole pieces of an electromagnet to magnetize and fully orient the ferrite material, the improvement of positioning a grooved block of dielectric having a low dielectric constant and high thermal conductivity against the face of the hexagonal ferrite so as to use the high thermal conductivity dielectric as a heat sink thereby extracting heat from the hexagonal ferrite.