RFID tag wide bandwidth logarithmic spiral antenna method and system
First Claim
1. An RFID tag antenna system suitable for receiving an RF signal, the RFID tag antenna system comprising:
- a planar two arm spiral structure arranged to receive the RF signal, the two arms electrically isolated from each other but arranged defining a gap between the two arms, an electronic circuit electrically connected to the arms straddling the gap and arranged to receive the RF signal from the planar two arm spiral antenna, and means for sensing the receipt of the RF signal by the electronic circuit.
7 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency identification (RFID) tag antenna system includes a planar two arm logarithmic spiral antenna with a suitably small form factor. There are two arms are of conductive foils or etched copper plating on a substrate the extend outwardly from a center in a logarithmic fashion. The two arms are identical to each other but rotated in the plane by 180 degrees. The arms also grow proportionally in width as they extend outward, but at any given distance from the center the width of both arms are equal to each other and, preferably, equal to the spaces between the arms. An impedance matching network receives the RF signal received by the dual spiral antenna and feed the RF signal to an electronic circuit that rectifies and multiplies the signal to form a DC signal that charges a capacitor. The electronics may be built onto the same substrate as the planar antenna, but preferably, the electronic circuit is built onto a second substrate is mounted, making appropriate electrical connections, to the antenna bearing substrate.
151 Citations
22 Claims
-
1. An RFID tag antenna system suitable for receiving an RF signal, the RFID tag antenna system comprising:
-
a planar two arm spiral structure arranged to receive the RF signal, the two arms electrically isolated from each other but arranged defining a gap between the two arms, an electronic circuit electrically connected to the arms straddling the gap and arranged to receive the RF signal from the planar two arm spiral antenna, and means for sensing the receipt of the RF signal by the electronic circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for receiving an RF signal from an RF signal generated as part of an RFID tag system, the method comprising the steps of:
-
arranging a planar two arm spiral structure to receive the RF signal, defining a gap between the two electrically isolated arms, electrically connecting an electronic circuit straddling the gap and arranged to receive the RF signal from the planar two arm spiral antenna, and sensing the receipt of the RF signal by the electronic circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification