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The disclosure relates to a 3D probe for magnetic field measurement

IP.com Disclosure Number: IPCOM000246302D
Publication Date: 2016-May-26
Document File: 2 page(s) / 193K

Publishing Venue

The IP.com Prior Art Database

Abstract

Near field measurement is a technique used in EMC diagnosis to localize the spurious radiated emission of a device or to measure the expected radiated electromagnetic field of a radiofrequency emitter device. For magnetic H field measurement, the probe consists in a small conductive loop. To get the total radiated H field, the measurements need to be done 3 times with 3 different loop orientations, each orthogonal to each other, in order to sense the field in x, y and y directions. As a result a certain time is needed to get this total radiated H field. The loop geometry of the near-field probe is usually a circle. A scientific paper "Cube probe structures for integrated near-field scanner module" describes a patented design of a "cube probe" that aims to simultaneously sense the three components of H field. The design of the "cube probe" is not adequate to sense the H field in the 3 directions, but is equivalent to a single loop tilted from x, y, z directions. According to the prior art, there is only one loop with a special 3D shape allowing to have at least 3 arms of the loop that are orthogonal to each other. However, the loop needs to be closed by adding additional arms to the 3 first orthogonal arms. Due to the additional arms, the loop cannot sense the H field of 3 orthogonal directions without adding a significant error due to the sensing contribution of the additional arms. That design does not allow to sense the total H field due to probe design issue. The problem of measuring the total H field with only one probe is solved by a special arrangement of 3 loops in series. According to the figure, in the new design of the 3D probe, 3 loops are use in series instead of only one. In the new design, each loop is 2D loops, not 3D loop. In the new design the 3 loops are placed on 3 orthogonal planes, one loop per plane and have the same origin resulting in a cross-like arrangement. The arrangement of the 3 loops limits the electric and magnetic coupling between loops. If we consider a first loop that can be any one of the 3 loops, and a second loop that can be any one of the 2 remaining loops, then he arrangement of the 3 loops is done such a way that the first loop cross the second loop with at least one arm of the first loop being orthogonal to at least one arm of the second loop, and the crossing of the 2 arms is located at the middle of each arms. The new structure of the 3D probe allows sensing the total H field. The advantage of the new probe structure allows to shorter the measurement time and to increase the measurement special accuracy.

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Cube probe structure for magnetic near-field measurement.

Field of the disclosure

The disclosure relates to a 3D probe for magnetic field measurement.

Technical context

     Near field measurement is a technique used in EMC diagnosis to localize the spurious radiated emission of a device or to measure the expected radiated electromagnetic field of a radiofrequency emitter device. For magnetic H field measurement, the probe consists in a small conductive loop. To get the total radiated H field, the measurements need to be done 3 times with 3 different loop orientations, each orthogonal to each other, in order to sense the field in x, y and y directions. As a result a certain time is needed to get this total radiated H field. The loop geometry of the near-field probe is usually a circle. A scientific paper "Cube probe structures for integrated near-field scanner module" describes a patented design of a "cube probe" that aims to simultaneously sense the three components of H field. The design of the "cube probe" is not adequate to sense the H field in the 3 directions, but is equivalent to a single loop tilted from x, y, z directions. According to the prior art, there is only one loop with a special 3D shape allowing to have at least 3 arms of the loop that are orthogonal to each other. However, the loop needs to be closed by adding additional arms to the 3 first orthogonal arms. Due to the additional arms, the loop cannot sense the H field of 3 orthogonal directions wi...