RF tag, RF tag attitude detection apparatus, and RF tag attitude detection system
First Claim
Patent Images
1. An RF tag orientation detection apparatus, comprising:
- a directional antenna which receives/transmits a radio signal from/to an RF tag;
an interrogator which measures the signal intensity of the radio signal received from the RF tag via the directional antenna; and
a detection section which detects the orientation of the RF tag in a reference coordinate system based on the signal intensity measured by the interrogator, the reference coordinate system having its origin at a point at which a probability of finding the RF tag attached to an article in the coordinate system is highest.
3 Assignments
0 Petitions
Accused Products
Abstract
According to the present invention, the attitude of the article with the RF tag can be automatically detected by detecting the attitude of the directional antenna of the RF tag relative to that of the directional antenna of the RF tag attitude detection apparatus based on the signal intensity of the radio signal received from the RF tag.
60 Citations
14 Claims
-
1. An RF tag orientation detection apparatus, comprising:
-
a directional antenna which receives/transmits a radio signal from/to an RF tag; an interrogator which measures the signal intensity of the radio signal received from the RF tag via the directional antenna; and a detection section which detects the orientation of the RF tag in a reference coordinate system based on the signal intensity measured by the interrogator, the reference coordinate system having its origin at a point at which a probability of finding the RF tag attached to an article in the coordinate system is highest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
-
-
9. An RF tag attitude detection apparatus, comprising:
-
a directional antenna which receives/transmits a radio signal from/to an RF tag; an interrogator which measures the signal intensity of the radio signal received from the RF tag via the directional antenna; and a detection section which detects the attitude of the RF tag based on the signal intensity measured by the interrogator, wherein the interrogator writes into the RF tag the attitude information on the attitude of the RF tag detected by the detection section. - View Dependent Claims (11)
-
-
10. An RF tag attitude detection apparatus, comprising:
-
a directional antenna which receives/transmits a radio signal from/to an RF tag; an interrogator which measures the signal intensity of the radio signal received from the RF tag via the directional antenna; a detection section which detects the attitude of the RF tag based on the signal intensity measured by the interrogator; a plurality of the directional antennas having a directivity direction or polarization plane direction different from each other; and a direction changing section which causes a relative change in at least one of the directivity direction and/or polarization plane direction of the directional antenna and the attitude of the RF tag, wherein the detection section detects the attitude of the RF tag based on the change of the signal intensity associated with the operation of the direction changing section, the direction changing section changes electronically or mechanically at least one of the directivity direction and polarization plane direction of the directional antenna, and the interrogator writes into the RF tag the attitude information on the attitude of the RF tag detected by the detection section. - View Dependent Claims (12, 14)
-
Specification