Counter-current RF field attenuator using loop tubes
10 Assignments
0 Petitions
Accused Products
Abstract
The attenuator is applicable to the art of identification, interrogation and communication equipment. The attenuator has particular application to equipment used in conjunction with smart cards, tags and like apparatus and including, in one form, an RF based technology, which has found a use in electronic ticketing, monitoring passenger movement and the identification and sorting of airline baggage and/or other items, such as containers or mail items. The attenuator, in one form, is predicated on the principle of creating a substantially opposing field, and applying this proximate the interrogator to substantially reduce stray field emissions. The attenuator, in another form, combines the physics of conducting tubes and self-cancelling fields and applies them to a tunnel interrogator. The attenuator thus applies a conducting tube which confines the field and the property of a loop generating a self-cancelling field to an interrogator. This combination may be called a "loop tube". In yet a further aspect, the loop tubes are arranged around the perimeter of the shield to suppress tangential field leakage that would normally be immune to the loop tube'"'"'s suppressing action.
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Citations
17 Claims
- 1. An attenuator including a loop tube.
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16. A loop tube for use with an interrogator.
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17. A loop tube for use in association with an interrogation apparatus, the loop tube comprising:
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a conducting tube of relatively conductive material for confining an impinging field emanating from an interrogator; and the tube being formed as a conductive loop in order to generate an opposing field in response to the impinging field, such that in use the loop tube substantially attenuates a stray field emissions component of the impinging field.
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Specification