Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 61, Issue 11, Pages 5372-5376Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2013.2278481
Keywords
Radio-frequency identification (RFID); split-ring resonators (SRRs); strip dipole antennas; tag antennas
Funding
- National Science Council, Taiwan [NSC 100-2221-E-002-221-MY2]
- National Taiwan University [102R890832]
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A compact strip dipole coupled split-ring resonator (SRR) antenna is proposed for radio-frequency identification (RFID) tag applications. The antenna has a simple and uniplanar structure and can be designed to conjugate match to the tag chip. Design details are presented and a tag chip of impedance (33 - j112) Omega at 915 MHz is used to verify the design. The simulated and measured input impedances of the prototype antenna are (34 + j116) Omega and (38 + j94) Omega, respectively, which are very close to the conjugate of the chip impedance. Simulated and measured radiation patterns are in good agreement and are nearly omnidirectional, especially in the H-plane. The minimum power transmitted by the reader and reflected back by the tag with detectable signals at the reader is also measured at two distances of about 1.5 lambda(0) and 3 lambda(0) using a commercially available reader card. The results are satisfactory.
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