A New Scheme to Avoid Null Zone for HF-Band RFID with Diversity Combining of Loop Antennas

• HIRAYAMA Hiroshi

  Dept. of Computer Science and Engineering, Nagoya Institute of Technology

• KIKUMA Nobuyoshi

  Dept. of Computer Science and Engineering, Nagoya Institute of Technology

• SAKAKIBARA Kunio

  Dept. of Computer Science and Engineering, Nagoya Institute of Technology

Abstract

A new scheme to avoid null zone for HF-band RFID without expanding antenna size is proposed. At first, we demonstrate by FDTD simulation that the null zone occurs because of cancellation of magnetic fields over the loop surface. To prevent cancellation of magnetic fields, the loop antenna is split into four parts, which work as a planar array antenna. The outputs of antennas are gathered by using combining circuit. We have validated by FDTD simulation that the proposed scheme enlarges the worst received power by 13.1dB.

Journal

• IEICE Transactions on Communications

  IEICE Transactions on Communications E93-B (10), 2666-2669, 2010

  The Institute of Electronics, Information and Communication Engineers

Keywords

• RFID
• selective diversity
• loop antenna
• wireless power feeding

Details

• CRID: 1390282679352200960
• NII Article ID: 10027639416
• NII Book ID: AA10826261
• DOI: 10.1587/transcom.e93.b.2666
• ISSN: 17451345
• ISSN: 09168516
• Web Site: http://www.jstage.jst.go.jp/article/transcom/E93.B/10/E93.B_10_2666/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed