Method of placing an electronic responder in or near an electrically conductive article, as well as an electrically conductive article provided with an electronic responder
First Claim
1. A method of placing an electronic responder in an electrically conductive article for reducing the effects of the conductive article on the electronic responder, said responder having at least one coil designed as an antenna, said coil, in operation, receiving an alternating field produced by an interrogation means, comprising the steps of making a through-bore opening in a surface of the article in registry with the desired position of the responder, and having larger dimensions than the outer dimensions of the responder coil;
- forming at least one slit in the conductive article extending outwardly from a point on the perimeter of the throughbore opening along the surface of the article to diminish the electromagnetic influence of the conductive article on the electronic responder; and
positioning said coil in a plane in said electrically conductive article in a way that the magnetic field lines traversing the coil no longer intersect the conductive article.
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Abstract
A method of placing an electronic responder of an electromagnetic interrogation system or an antenna coil of an electromagnetic interrogator device in or near an electrically conductive article. An opening is made in the article, which is larger than the responder or antenna coil, and the responder or the antenna coil is mounted in registry with said opening. There is also provided a slit in the article, extending from the opening, said slit interrupting extraneous circular currents.
23 Citations
22 Claims
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1. A method of placing an electronic responder in an electrically conductive article for reducing the effects of the conductive article on the electronic responder, said responder having at least one coil designed as an antenna, said coil, in operation, receiving an alternating field produced by an interrogation means, comprising the steps of making a through-bore opening in a surface of the article in registry with the desired position of the responder, and having larger dimensions than the outer dimensions of the responder coil;
- forming at least one slit in the conductive article extending outwardly from a point on the perimeter of the throughbore opening along the surface of the article to diminish the electromagnetic influence of the conductive article on the electronic responder; and
positioning said coil in a plane in said electrically conductive article in a way that the magnetic field lines traversing the coil no longer intersect the conductive article. - View Dependent Claims (2, 3, 4, 5)
- forming at least one slit in the conductive article extending outwardly from a point on the perimeter of the throughbore opening along the surface of the article to diminish the electromagnetic influence of the conductive article on the electronic responder; and
- 6. An electrically conductive article provided with an electronic responder of the type having at least one coil designed as an antenna, said coil, in operation, receiving an alternating field produced by an interrogation means, characterized in that the article is provided with a through-bore in its surface having a diameter larger than the largest outer dimension of the responder coil, and means for reducing undesirable effects of the conductive article on the electronic responder including at least one slit projecting outwardly from a point on the perimeter of the through-bore along the surface of the article, said responder being mounted in registry with the through-bore wherein said coil is positioned in a plane in said electrically conductive article in a way that magnetic field lines traversing the coil no longer intersect the conductive article.
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12. A method of placing an antenna coil of an electromagnetic interrogation means in an electrically conductive article and reducing the effects of the conductive article on the interrogation means, in which the interrogation means is of the type having at least one coil designed as an antenna, which coil, in operation, is capable of detecting an alternating field modulated by an electronic responder, comprising the steps of:
- making a through-bore opening in a surface of the article in registry with the desired position of the antenna coil, and having larger dimensions than the outer dimensions of the antenna coil;
making at least one slit projecting outwardly from a point on the perimeter of the opening along the surface of the article in the conductive article to reduce electromagnetic coupling and positioning said coil in a plane in said electrically conductive article in a way that magnetic field lines traversing the coil no longer intersect the conductive article. - View Dependent Claims (13, 14, 15, 16)
- making a through-bore opening in a surface of the article in registry with the desired position of the antenna coil, and having larger dimensions than the outer dimensions of the antenna coil;
- 17. An electrically conductive article provided with an antenna coil of an electromagnetic interrogation means of the type having at least one coil designed as an antenna, said coil, in operation, being capable of detecting an alternating field modulated by an electronic responder, the article comprises a through-bore in a surface of the article having a diameter larger than the largest outer dimension of the antenna coil, and means for reducing the effects of the conductive article on the interrogation means, including at least one slit extending outwardly from a point on the perimeter of the through-bore along the surface of the article, with the antenna coil being mounted in registry with the through-bore wherein said coil is positioned in a plane in said electrically conductive article in a way that magnetic field lines traversing the coil no longer intersects the conductive article.
Specification