Switching patch antenna

Communications: radio wave antennas – Antennas – Microstrip

Reexamination Certificate

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C343S846000

Reexamination Certificate

active

07068224

ABSTRACT:
According to an embodiment of the invention, a patch antenna includes a patch coupled to a ground plane. The ground plane includes a first and second strip line. When the first strip line is activated, the antenna generates a signal having a first polarization, and when the second strip line is activated, the antenna generates a second polarization. The first polarization may be a horizontal polarization, and the second polarization may be a vertical polarization. The antenna may be incorporated into a radio frequency identification (RFID) interrogator, which may be used to read RFID tags attached to individual items.

REFERENCES:
patent: 4538153 (1985-08-01), Taga
patent: 4903033 (1990-02-01), Tsao et al.
patent: 5241321 (1993-08-01), Tsao
patent: 5300936 (1994-04-01), Izadian
patent: 6486769 (2002-11-01), McLean
patent: 2005/0057396 (2005-03-01), Boyanov
J.F. Zurcher and F.E. Gardiol, “Broadband Patch Antennas”, XP002327945, Artech House, Inc., pp. 124-129 (1995).
S. K. Padhi, et al., “A Dual Polarized Aperture Coupled Microstrip Patch Antenna With High Isolation for RFID Applications”, XP010564017, IEEE Antennas and Propagation Society International Symposium. 2001 Digest, pp. 2-5 (Jul. 8-13, 2001).
Naftali Herscovici, “New Considerations in the Design of Microstrip Antennas,” XP-000766091, IEEE on Antennas and Propagation, vol. 46, No. 6, pp. 807-812 (Jun. 1998).
PCT Invitation to Pay Additional Fees for PCT Counterpart Application No. PCT/US2005/004923 Containing International Search Report, 7 pgs. (Jun. 2, 2005).
PCT Notification Of Transmittal Of The International Search Report And The Written Opinion Of The International Searching Authority, Or The Declaration, for PCT International Appln No. US2005/004923, mailed Aug. 2, 2005 (15 pages total).

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