Owner Checkpoint Systems, Inc.

Inventors Oung, Harry; Zeng, Kefeng

Agent Phillips Ormonde Fitzpatrick

Pub. Number AU-A-2009345122

PCT Pub. Number WO2010/126549

Priority 12/433,375 30.04.09 US

Filing date 28 August 2009

Wipo publication date 4 November 2010

H01Q 3/26 (2006.01) Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an aerial or aerial system - varying the relative phase or relative amplitude of energisation between two or more active radiating elements

G06K 7/08 (2006.01) Methods or arrangements for sensing record carriers - by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes

G06K 7/10 (2006.01) Methods or arrangements for sensing record carriers - by electromagnetic radiation, e.g. optical sensing

H01Q 1/22 (2006.01) Details of, or arrangements associated with, aerials - by structural association with other equipment or articles

H01Q 7/00 (2006.01) Loop aerials with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop