RFID ANTENNA SYSTEM WITH MULTI-AXIS POLARIZATION FOR FIELD INSTALLATION AND BEAM STEERING OPERATIONS

摘要

Antenna system includes a fixture having a first portion and a second portion joined along an alignment axis. A first planar antenna element having a first polarization direction is aligned with a first plane, and secured to the first portion of the antenna fixture. A second planar antenna element has a second polarization direction aligned with a second plane. The second planar antenna element is secured to the second portion of the antenna fixture so that the second plane is transverse to the first plane and the first and second planes intersect along a line parallel to the alignment axis. At least one tuned element mitigates near-field interference as between the first planar antenna element and the second planar antenna element. Signals applied to the antenna feed port will result in three-polarization radiation.

主权项

1. A field installation optimized radio frequency identification (RFID) antenna system, comprising:
an antenna fixture having a first portion and a second portion joined along an alignment axis; a first planar antenna element having a first polarization direction aligned with a first plane, and secured to the first portion of the antenna fixture; a second planar antenna element having a second polarization direction aligned with a second plane, the second planar antenna element secured to the second portion of the antenna fixture so that the second plane is transverse to the first plane and the first and second planes intersect along a line parallel to the alignment axis; an antenna feed port secured to the fixture directly coupled to at least one of the first and second planar antenna elements; wherein the RFID antenna system includes at least one tuned element which mitigates near-field interference as between the first planar antenna element and the second planar antenna element when the first and second planar antenna elements are mounted in the antenna fixture; and wherein the first polarization direction is transverse to second polarization direction whereby signals applied to the antenna feed port will result in three-polarization radiation.