Closed slot antenna having outer and inner magnetic loops
First Claim
1. An RF identification system, said system comprising:
- a) an interrogator operable to send RF interrogations and to receive RF responses;
b) a closed slot antenna in electrical communication with said interrogator, said antenna comprising an an outer virtual magnetic loop and an inner virtual magnetic loop, said antenna operable to receive said RF responses and to provide said RF responses to said interrogator; and
c) a transponder associated with an object to be identified, said transponder operable to receive said RF interrogations and to provide said RF responses in response to said RF interrogations.
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Accused Products
Abstract
An RF identification system having an interrogator operable to send RF interrogations to a transponder and to receive RF responses from the transponder. The interrogator is in electrical communication with a closed slot antenna. The closed slot antenna is formed by an an outer virtual magnetic loop and an inner virtual magnetic loop such that the antenna has a superior magnetic field when compared to a balanced double loop antenna with an equal area and a superior far-field noise suppression when compared to the single loop antenna. The antenna receives said RF responses from the transponder and provides said RF responses to said interrogator. Other devices, systems and methods are also disclosed.
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Citations
14 Claims
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1. An RF identification system, said system comprising:
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a) an interrogator operable to send RF interrogations and to receive RF responses; b) a closed slot antenna in electrical communication with said interrogator, said antenna comprising an an outer virtual magnetic loop and an inner virtual magnetic loop, said antenna operable to receive said RF responses and to provide said RF responses to said interrogator; and c) a transponder associated with an object to be identified, said transponder operable to receive said RF interrogations and to provide said RF responses in response to said RF interrogations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of identifying objects, the method comprising the steps of:
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a) providing an interrogator, said interrogator operable to transmit RF interrogations and to receive RF responses; b) providing a closed loop antenna in electrical communication with said interrogator, said antenna having an inner virtual magnetic loop an outer virtual magnetic loop, said antenna operable to receive said RF responses; c) providing a object, said object having a transponder fixedly attached thereto; d) placing said object in proximity to said closed loop antenna; e) transmitting from said interrogator an RF interrogation; f) receiving by said transponder said RF interrogation; g) transmitting from said transponder an RF response, responsive to said RF interrogation; h) receiving by said antenna said RF response; and i) communicating said RF response from said antenna to said interrogator. - View Dependent Claims (12, 13, 14)
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Specification