Patent ID: 6160524
Filing Date: 2000-12-12
Classification: H01Q

Abstract:
A ferroelectric microwave device with reduced temperature sensitivity, comprising:a ferroelectric body is placed between a waveguide structure means and a ground plane;said ferroelectric body, being loaded with a ferroelectric material composed of a plurality of ferroelectric grains, is connected to a high frequency transmission line of said waveguide structure;a dc bias voltage means applies a dc voltage across said ferroelectric material to provide a dc electric field across said ferroelectric material;a propagating electromagnetic energy is generated by dc electric field;said ferroelectric body having a given dielectric constant in the presence of a zero bias electric field secured to said waveguide structure whereby at least a portion of said propagating electromagnetic field is propagated through said ferroelectric body;a means for producing a dc bias field through said ferroelectric body for modifying the dielectric constant thereof in a predetermined manner; andsaid ferroelectric body having a grain size which is less than about 100 nm.