Antenna apparatus for linearly polarized diversity antenna in RFID reader and method of controlling the antenna apparatus
AssigneesElectronics and Telecommunications Reseach Institute, Chungbuk National University Industry-Academic Cooperation Foundation
InventorsJong Moon Lee, Nae-Soo Kim, Cheol Sig Pyo, Ik Guen Choi
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Abstract
Provided are an antenna apparatus for linearly polarized diversity antennas in a radio frequency identification (RFID) reader, and a method of controlling the antenna apparatus. The antenna apparatus includes: a plurality of linearly polarized diversity antennas disposed to have different directions to one another; a switching unit connecting the linearly polarized diversity antennas to the RFID reader; and a controller controlling the switching unit to selectively activate the linearly polarized diversity antennas.
Claims7
An antenna apparatus for linearly polarized diversity antennas in an RFID (radio frequency identification) reader, the antenna apparatus comprising:
- four linearly polarized diversity antennas disposed to have different directions to one another, wherein the four linearly polarized diversity antennas are disposed at angles of 45° relative to one another and has a polarization mismatch loss of about 1.38 dB;
- a switching unit connecting the linearly polarized diversity antennas to the RFID reader;
- and
- a controller controlling the switching unit to selectively activate the linearly polarized diversity antennas.
A method of controlling an antenna apparatus for linearly polarized diversity antennas in an RFID reader, the method comprising:
- controlling four linearly polarized diversity antennas in order for the linearly polarized diversity antennas to have different directions to one another, wherein the four linearly polarized diversity antennas are disposed at angles of 45° relative to one another and has a polarization mismatch loss of about 1.38 dB;
- and
- switching on and/or off a current supplied to the four linearly polarized diversity antennas.
Dependencies are inferred from the claim text.