Closed slot antenna having outer and inner magnetic loops

Details Closed slot antenna having outer and inner magnetic loops Closed slot antenna having outer and inner magnetic loops

1993-06-15

1995-07-11

Eldred, J. Woodrow

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

342 50, 340505, 343742, 343746, G01S 1374

Patent

active

054325188

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.

REFERENCES:
patent: 3576567 (1971-04-01), Shively
patent: 4373163 (1983-02-01), Vandebult
patent: 4509039 (1985-04-01), Dowdle
patent: 4911217 (1990-03-01), Dunn et al.
patent: 4994817 (1991-02-01), Munson et al.
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5198826 (1993-03-01), Ito
patent: 5276430 (1994-01-01), Granovsky

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