Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1995-06-07
1997-11-25
Hajec, Donald T.
Communications: radio wave antennas
Antennas
High frequency type loops
343788, 343842, 343867, H01Q 1112
Patent
active
056917317
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 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.
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Brady Wade James
Donaldson Richard L.
Hajec Donald T.
Phan Tho
Texas Instruments Incorporated
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