Radio wave absorber, electromagnetic field measurement system and radiated immunity system

Abstract

A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

1 . An electromagnetic field probe, comprising:
 an antenna section;   a wire connected to the antenna section;   a support member that supports the antenna section; and   a longitudinal radio wave absorber surrounding a circumference of the support member,   wherein the radio wave absorber has a proximal end section provided close to the antenna section and a distal end section provided remote from the antenna section,   wherein a cross-sectional area of the radio wave absorber increases in accordance with a distance from the proximal end section toward the distal end section, and   wherein the cross-sectional area is configured to be maximum at an intermediate position between the proximal end section and the distal end section or at the position of the distal end section.   
     
     
         2 . The electromagnetic field probe according to  claim 1  further comprising a box section that is coupled to the support member and receives an input of a receiving result performed by the antenna section by way of the wire,
 wherein the radio wave absorber covers a face of the box section facing the antenna section. 
 
     
     
         3 . The electromagnetic field probe according to  claim 1 , wherein the radio wave absorber includes a first radio wave absorbing section, and a second radio wave absorbing section engaged with the first radio wave absorbing section, and
 wherein the first radio wave absorbing section and the second radio wave absorbing section cover the support member.   
     
     
         4 . The electromagnetic field probe according to  claim 1 , wherein the support member is a pipe member in which the wire is provided therethrough and supports the antenna section. 
     
     
         5 . The electromagnetic field probe according to  claim 1 , wherein an outer shape of the radio wave absorber is formed in a shape of an substantially truncated cone. 
     
     
         6 . The electromagnetic field probe according to  claim 1 , wherein an outer shape of the radio wave absorber is formed in a shape of an substantially truncated prismoid. 
     
     
         7 . The electromagnetic field probe according to  claim 1 , wherein the radio wave absorber has an outer shape formed by bulging a side surface of an substantially truncated cone.