COMPACT, POLARIZATION-INSENSITIVE ANTENNA FOR HANDHELD RFID READER AND METHOD OF MAKING AND USING SAME

摘要

An antenna, especially for use with a handheld RFID reader for scanning RFID tags oriented in different orientations, includes a feeding port located on an axis for supplying an RF signal to a primary antenna member for transmitting and receiving electromagnetic waves. A secondary antenna member is juxtaposed with the primary antenna member for re-radiating the electromagnetic waves propagated by the primary antenna member. Each antenna member includes one antenna element extending in a radial direction away from the axis and continuing along at least one turn in a turning direction at least partly about the axis, and another antenna element extending in an opposite radial direction away from the axis and continuing along at least one turn in the turning direction at least partly about the axis. The electromagnetic waves have congruent slant polarizations each having components in both of two mutually orthogonal planes to read the tags.

主权项

1. An antenna, comprising:
a radio frequency (RF) signal feeding port located on an axis, and operative for supplying an RF signal in an operating band of frequencies; and a primary antenna member operatively connected to the port, and including an electrically conductive, first antenna element extending in a radial direction away from the axis and continuing along at least one turn in a turning direction at least partly about the axis, and an electrically conductive, second antenna element extending in an opposite radial direction away from the axis and continuing along at least one turn in the turning direction at least partly about the axis, the first and second antenna elements being rotationally symmetrically arranged about the axis, and being operative for conducting the RF signal along the primary antenna member, and for transmitting and receiving electromagnetic waves with a primary slant polarization having components in both of two mutually orthogonal planes.