RFID Near Field Microstrip Antenna
AssigneeSensormatic Electronics Corporation
InventorsGary Mark Shafer, Karen Bellum Bomber, George A. Reynolds, JR., John Ford, Ming-Ren Lian, Edward Di Carlo, Richard L. Copeland, Marcus Christopher
Life of this patent
Estimating the term…
Abstract
A near field antenna is disclosed which is configured to read an RFID label such that a localized electric E field emitted by the antenna at an operating wavelength resides substantially within a zone defined by the near field. The localized E field directs a current distribution along an effective length of the antenna corresponding to a half-wave to a full-wave structure.
Claims10
A near field antenna which is configured to read an RFID label, the antenna being configured such that a localized electric E field emitted by the antenna at an operating wavelength resides substantially within a zone defined by the near field, and the localized E field directs a current distribution along an effective length of the antenna corresponding to a half-wave to a full-wave structure.
A method of reading an RFID label comprising the steps of:
- providing a near field antenna assembly configured such that a localized electric E field emitted by the antenna assembly at an operating wavelength resides substantially within a zone defined by the near field wherein the localized E field directs a current distribution along an effective length of the antenna corresponding to a half-wave to a full-wave structure;
- and
- coupling the localized electric E field of the near field antenna assembly to an RFID label disposed within the near field zone.
A near field antenna assembly for reading an RFID label comprising:
- an antenna configured as a single and continuous conductor, the antenna extending from one end forming a feed point to another end forming a termination point;
- the termination point being connected to a ground plane through a resistor, the antenna assembly having a relative dielectric constant;
- the antenna being configured such that a localized electric E field emitted by the antenna at an operating wavelength resides substantially within a zone defined by the near field, and the localized E field directs a current distribution along an effective length of the antenna corresponding to a half-wave to a full-wave structure.
Dependencies are inferred from the claim text.