Patents by Inventor JOHN A. KAJANDER

JOHN A. KAJANDER has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • CIRCULARLY-POLARIZED RFID TAG ANTENNA STRUCTURE
    Publication number: 20080180254
    Abstract: One embodiment of the invention includes an antenna structure for a passive radio-frequency identification (RFID) tag. The antenna structure comprises a first planar antenna element and a second planar antenna element that is coplanar with the first planar antenna element. The first and second planar antenna elements can be configured to receive circularly-polarized RF interrogation signals and to generate circularly-polarized RF signals having an axial ratio (AR) of less than 5 dB for transmission.
    Type: Application
    Filed: December 18, 2007
    Publication date: July 31, 2008
    Inventor: JOHN A. KAJANDER