Measurement unit

Abstract

A measurement unit includes: a ground portion forming a part of a line configured to provide continuity for grounding electric potential, the ground portion including a surface forming a plane at one end of the ground portion; a signal portion forming a part of a line configured to provide continuity for a signal for measurement, the signal portion including an end portion configured to come out in a plane that is same as the plane of the ground portion; an insulative dielectric portion provided between the ground portion and the signal portion; an electrically conductive first contact probe configured to expand and contract along a longitudinal axis, the first contact probe coming into contact with the signal portion; and an electrically conductive second contact probe configured to expand and contract along a longitudinal axis, the second contact probe coming into contact with the ground portion.

what is claimed is: 
     
         1 . A measurement unit comprising:
 a ground portion forming a part of a line configured to provide continuity for grounding electric potential, the ground portion including a surface at one end of the ground portion, the surface forming a plane;   a signal portion forming a part of a line configured to provide continuity for a signal for measurement, the signal portion including an end portion configured to come out in a plane that is same as the plane of the ground portion;   a dielectric portion provided between the ground portion and the signal portion, the dielectric portion being insulative;   a first contact probe configured to expand and contract along a longitudinal axis, the first contact probe being electrically conductive and coming into contact with the signal portion; and   a second contact probe configured to expand and contract along a longitudinal axis, the second contact probe being electrically conductive and coming into contact with the ground portion.   
     
     
         2 . The measurement unit according to  claim 1 , further comprising:
 a ground plate; and   a coaxial cable connected to the ground plate, wherein the coaxial cable comprises:
 a signal conductor forming the part of the line of the signal portion; 
 a dielectric provided around the signal conductor; and 
 a ground conductor provided around the dielectric, 
   the signal conductor forms the signal portion,   the dielectric forms the dielectric portion, and   the ground conductor and the ground plate form the ground portion.   
     
     
         3 . The measurement unit according to  claim 2 , wherein
 the ground plate includes a through hole formed in the ground plate, and   the ground conductor is inserted into the through hole.   
     
     
         4 . The measurement unit according to  claim 2 , wherein
 the ground plate includes a through hole formed in the ground plate,   the dielectric is inserted into the through hole, and   the ground conductor is electrically connected to a surface of the ground plate.   
     
     
         5 . The measurement unit according to  claim 1 , further comprising:
 a ground plate; and   a coaxial cable connected to the ground plate, wherein   the ground plate comprises:
 a signal relaying portion forming the part of the line of the signal portion; and 
 a ground plate dielectric configured to cover an outer periphery of the signal relaying portion, 
   the coaxial cable comprises:
 a signal conductor forming the part of the line of the signal portion and electrically connected to the signal relaying portion; 
 a cable dielectric provided around the signal conductor; and 
 a ground conductor provided around the cable dielectric and electrically connected at a position different from positions of the signal relaying portion and ground plate dielectric of the ground plate, wherein 
   the signal relaying portion and the signal conductor form the signal portion,   the ground plate dielectric and the cable dielectric form the dielectric portion, and   the ground conductor and the ground plate form the ground portion.   
     
     
         6 . The measurement unit according to  claim 2 , wherein a plurality of the coaxial cables are connected to the ground plate. 
     
     
         7 . The measurement unit according to  claim 3 , wherein a plurality of the coaxial cables are connected to the ground plate. 
     
     
         8 . The measurement unit according to  claim 4 , wherein a plurality of the coaxial cables are connected to the ground plate. 
     
     
         9 . The measurement unit according to  claim 5 , wherein a plurality of the coaxial cables are connected to the ground plate. 
     
     
         10 . The measurement unit according to  claim 1 , further comprising:
 a coaxial cable including:
 a signal conductor forming the line of the signal portion; 
 a dielectric provided around the signal conductor and forming the dielectric portion; and 
 a ground conductor provided around the dielectric and forms the ground portion, wherein 
   the ground conductor comprises:
 a tubular portion extending along the signal conductor and the dielectric; and 
 a flat plate portion provided at an end portion of the tubular portion, the flat plate portion being tabular, and 
   end faces of the signal conductor and the dielectric are positioned in a same plane as a surface of the flat plate portion.   
     
     
         11 . The measurement unit according to  claim 10 , further comprising a plurality of groups each including the signal conductor, the dielectric, and the tubular portion. 
     
     
         12 . The measurement unit according to  claim 1 , further comprising:
 a first connecting portion including the ground portion, the signal portion, and the dielectric; and   a second connecting portion including the ground portion, the signal portion, and the dielectric and provided opposite to the first connecting portion, wherein   one end of each of the first and second contact probes comes into contact with the first connecting portion and the other end of each of the first and second contact probes comes into contact with the second connecting portion.