Patent ID: 7449637
Filing Date: 2008-11-11
Classification: G01R

Abstract:
1. A sensor to measure high frequency currents, comprising: a first coaxial transmission line comprising an inner conductor and an outer conductor, the outer conductor having a first portion and a second portion, the inner conductor being continuous within the first portion and the second portion, the first portion and the second portion of the outer conductor being electrically discontinuous, the first coaxial transmission line having a characteristic impedance; a sensing resistance section positioned around the inner conductor of the first coaxial transmission line between the first portion and the second portion of the outer conductor of the first coaxial transmission line, the sensing resistance section having a first terminal electrically connected to the first portion of the outer conductor of the first coaxial transmission line and having a second terminal electrically connected to the second portion of the outer conductor of the first coaxial transmission line, the sensing resistance section having a characteristic impedance approximately the same as the characteristic impedance of the first coaxial transmission line; and a second coaxial transmission line having an inner conductor electrically connected to the first terminal of the sensing resistance section and having an outer conductor with a terminal portion electrically connected to the second terminal of the resistance section.