Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2004-09-30
2008-09-09
Wimer, Michael C (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S833000, C235S462460, C340S010100
Reexamination Certificate
active
07423606
ABSTRACT:
A portable/handheld device is provided having a processing module configured to selectively operate a reading mode selected from a far-field mode and a near-field mode, and a directional antenna array coupled to the processing module. The directional antenna array includes a first antenna element configured to radiate electromagnetic (EM) radiation in a far-field, and a second antenna element coupled to the first antenna element. The second antenna element is configured to radiate EM radiation in a near-field. The second antenna element includes an antenna transducer configured to selectively cancel far-field EM radiation from the first antenna element. A method of reading inductively coupled radio frequency identification (RFID) tags is also provided having the steps of scanning at least one frequency band to detect a RFID tag, and selectively radiating one of a near-field electromagnetic (EM) field and a far-field EM field based on the detected RFID tag.
REFERENCES:
patent: 4028709 (1977-06-01), Berkowitz et al.
patent: 4218686 (1980-08-01), Blonder
patent: 4336543 (1982-06-01), Ganz et al.
patent: 4373163 (1983-02-01), Vandebult
patent: 4700197 (1987-10-01), Milne
patent: 5061941 (1991-10-01), Lizzi et al.
patent: 5220335 (1993-06-01), Huang
patent: 5493704 (1996-02-01), Grangeat et al.
patent: 5612706 (1997-03-01), Podell
patent: D385563 (1997-10-01), Podell
patent: 5712643 (1998-01-01), Skladany
patent: 5748156 (1998-05-01), Weber
patent: 5877728 (1999-03-01), Wu et al.
patent: 5898410 (1999-04-01), DeMarre
patent: 5913549 (1999-06-01), Skladany
patent: 5914692 (1999-06-01), Bowers et al.
patent: 6061036 (2000-05-01), MacDonald et al.
patent: 6069564 (2000-05-01), Hatano et al.
patent: 6127928 (2000-10-01), Issacman et al.
patent: 6229491 (2001-05-01), Bolden et al.
patent: 6307524 (2001-10-01), Britain
patent: 6326922 (2001-12-01), Hegendoerfer
patent: 6353406 (2002-03-01), Lanzl et al.
patent: 6445297 (2002-09-01), Nicholson
patent: 6483476 (2002-11-01), Cox
patent: 6617962 (2003-09-01), Horwitz et al.
patent: 6809699 (2004-10-01), Chen et al.
patent: 6922173 (2005-07-01), Anderson
patent: 2002/0105473 (2002-08-01), Cox
patent: 2002/0139822 (2002-10-01), Infanti
patent: 2003/0125725 (2003-07-01), Woodard et al.
patent: 2003/0160730 (2003-08-01), Alsliety
patent: 0598624 (1994-05-01), None
patent: 0 718 912 (1996-06-01), None
patent: 1209615 (2002-05-01), None
patent: 2 393 076 (2004-03-01), None
patent: 10 032418 (1996-07-01), None
patent: 2000 322545 (2000-11-01), None
patent: 2001109853 (2001-04-01), None
patent: 9837596 (1998-08-01), None
patent: WO/98/37596 (1998-08-01), None
patent: 2004015625 (2004-02-01), None
patent: WO/2004/015625 (2004-02-01), None
patent: PCT/US2005/034356 (2006-01-01), None
Deal, William R. et al., A Now Quasi-Yagi Antenna For Planar Active Antenna Arrays, IEEE Transactions on Microwave Theory and Techniques, IEEE Inc., New York, US, vol. 48, No. 6, Jun. 2000 pp. 910-918.
Bridgelall Raj
Charych Hal
Duron Mark William
Knadle, Jr. Richard T.
Ingrassia Fisher & Lorenz P.C.
Symbol Technologies Inc.
Wimer Michael C
LandOfFree
Multi-frequency RFID apparatus and methods of reading RFID tags does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-frequency RFID apparatus and methods of reading RFID tags, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-frequency RFID apparatus and methods of reading RFID tags will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3983616