Apparatus and method for eliminating blind spot in an rf antenna array

Abstract

The present invention provides an apparatus and method for eliminating blind spot of a high frequency RF antenna array, allowing an RFID tag to be detected when placed anywhere on top of and within the communication range of the RF antenna array. The RF antenna array includes a first array of RF antenna placed on a first surface and a second RF antenna placed on a second surface. The second RF antenna is located directly below or above the area encompassing borders of multiple antennas in the first array, but is not connected to any electrical path. Through the electromagnetic induction with the EM field generated by the first RF antenna array, a second EM field is formed by the second RF antenna, which enables detection and identification of the RFID tag placed on the blind spot of the first array of RF antenna. The present invention is useful in improving the RF communication range and accuracy of a passive RFID system.

Dependencies are inferred from the claim text.