Dual polarization antenna and RFID reader employing the same

Details Dual polarization antenna and RFID reader employing the same Dual polarization antenna and RFID reader employing the same

2005-12-07

2008-09-23

Phan, Tho G (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S846000

Reexamination Certificate

active

07427955

ABSTRACT:
Provided is a dual polarization antenna realized by using four inverted F-type radiators and a Radio Frequency Identification (RFID) reader employing the dual polarization antenna. The dual polarization antenna includes a ground plate and four inverted F-type radiators set up on the ground plate. Currents of the same phase are fed to the first and second inverted F-type radiators each other. Currents of an inverted phase are fed to the third and fourth inverted F-type radiators each other. The four inverted F-type radiators form an angle of 90° with one another. The first and second inverted F-type radiators radiate electric wave of vertical polarization and the third and fourth inverted F-type radiators radiate electric wave of horizontal polarization. Since the dual polarization antenna has excellent orthogonal and isolation characteristics, the antenna can extend a transmission distance between the reader and the tag and improve a communication quality.

REFERENCES:
patent: 6147650 (2000-11-01), Kawahata et al.
patent: 6369762 (2002-04-01), Yanagisawa et al.
patent: 6535170 (2003-03-01), Sawamura et al.
patent: 6911944 (2005-06-01), Sekine et al.
patent: 6980154 (2005-12-01), Vance et al.

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