Patent ID: 8841921

Claim:
A microwave signal coupler comprising an input port and an output port and two coupled ports; and a low loss slotted transmission airline between said input port and output port; said airline having a center conductor and a ground mantle; and a capacitive electric field sensor inserted into the slotted transmission airline perpendicularly to the axis of the slotted transmission airline and coupled in a non-contacting manner with the center conductor; whereby said electric field sensor comprises a coaxial cable and its protruding center conductor on one the end which is placed in proximity to the center conductor, the other end of said cable being connected with a coupled port; and a magnetic field loop sensor comprising a magnetic loop on one end and being attached on a coupled port connector on the other, said magnetic loop being placed in proximity of the center conductor and coupled in a non-contacting manner with the center conductor; whereby said electric field sensor can be displaced laterally across the width of the slotted transmission airline oriented perpendicularly to the center conductor.