초록 ▼

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 visual magnetic loop a

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 visual magnetic loop and an inner visual 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.

대표청구항 ▼

A closed slot antenna, said antenna comprising a wire which is configured to form an antenna having an outer magnetic loop and an inner magnetic loop, said outer loop and said inner loop being generally concentric about a center point, said wire proceeding in a first angular direction with respect t

A closed slot antenna, said antenna comprising a wire which is configured to form an antenna having an outer magnetic loop and an inner magnetic loop, said outer loop and said inner loop being generally concentric about a center point, said wire proceeding in a first angular direction with respect to said center point from a first point on the outer loop to a second point on the outer loop thereby traversing a first portion of the outer loop, said wire then reversing direction inwardly to a third point on the inner loop and proceeding in a second angular direction nearly completely about the inner magnetic loop until reaching a fourth point on the inner loop, said fourth point in non-contacting, close proximity to said third point, and reversing direction outwardly to a fifth point on the outer loop, and proceeding in said first angular direction about a second portion of the outer loop to a fifth point on the outer loop, said sixth point in non-contacting, close proximity to said second point thereby forming a virtual inner closed magnetic loop between said third point and said fourth point and a virtual outer closed magnetic loop between said first point and said sixth point.