公开(公告)号：JPH10224144A

公开(公告)日：1998-08-21

申请号：JP34620497

申请日：1997-12-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SHOBER R ANTHONY ,  SWEETMAN ERIC ,  YOU-SAN WU

IPC: G06K17/00 ,  G07B15/02 ,  H01P5/12 ,  H01P5/22 ,  H01Q1/22 ,  H01Q9/18 ,  H01Q13/08 ,  H01Q21/06 ,  H01Q21/08 ,  H04B1/59 ,  H04B5/00

Abstract: PROBLEM TO BE SOLVED: To provide transmitting and receiving antennas which are small, light-weight and also inexpensive, and provide a beam width that is suitable for use. SOLUTION: This antenna system is suitable for an application in which a RFID tag passes near an interrogator. A single flat planar antenna 410 is used for transmission, and a multi-element flat planar antenna array 460 is used for receiving. In the multi-element flat planar antenna array, each element 420 to 450 is placed at intervals that are separated by 10.16cm for center to center interval and decides receiving beam width of narrow 30 degrees on a horizontal flat plane. A vertical receiving band width is far larger than 30 degrees and facilitates an interrogator in receiving signals at various heights.