Patent ID: 8040138
Filing Date: 2011-10-18
Classification: H05H

Abstract:
1. A planar type frequency shift probe for measuring plasma electron densities, comprising a planar main body with a planar electrically conductive plate having an uncurved planar surface, the uncurved planar surface being a surface in which all lines normal to the surface, in any given area of the surface, are parallel to one another, and a coaxial cable formed by a surface conductor and a core conductor embedded in a dielectric material filled within said surface conductor, both of which are electrically connected to one surface of said planar main body, and measuring plasma electron densities in a vessel by use of the resonance of electromagnetic waves, wherein said planar main body comprises a connecting part adjacent to the dead end of a long narrow space, in which one of both ends of the space has an opening on the periphery of said planar main body and first and second surface parts of said planar main body which are separated by said connecting part and yet mechanically integrated by said connecting part, and said surface conductor of said coaxial cable is electrically connected to one of the first and second surface parts and said core conductor is electrically connected to the other of the first and second surface parts.