Showing papers on "Coplanar waveguide published in 1974"

High speed electro-optic waveguide modulator

Abstract: An optical waveguide for transmitting light energy is defined by a channel of diffusant in a selected substrate material. An electrical conductor is positioned proximate to each side of the optical waveguide channel and a source of electrical signals is connected to the electrical conductors to develop an electrical field across the optical waveguide, producing resultant changes in refractive index commensurate with the electrical signals impressed upon the parallel electrical conductors. The changes of refractive index cause changes in polarization of light energy transmitted through that portion of the optical waveguide so that such light energy is phase modulated. In a preferred waveguide electro-optic modulator assembly, polarized light energy transmitted by the optical waveguide may undergo a change of polarization which, when intercepted by a polarization-sensitive filter, will produce an amplitude modulation of the light energy transmitted by the assembly.

Device including ferrimagnetic coupling element

Abstract: A radio frequency coupling device has a non-magnetic, dielectric substrate having a planar surface on which a ferrimagnetic disc-shaped film is epitaxially grown. Sections of surface-oriented transmission line such as coplanar waveguide or slot-line extend over the substrate surface and terminate over the disc. The ferrimagnetic material couples to the RF magnetic fields associated with the transmission line sections and provides a coupling therebetween which is tunable by adjusting a direct magnetic field applied to the disc. Low direct coupling between the sections is obtained by arranging their respective RF magnetic fields to be orthogonal at the disc.