Design of Near-Field Edge-Shorted Slot Microstrip Antenna for RFID Handheld Reader Applications

In this letter, a compact edge-shorted slot microstrip antenna with good near-field performance for radio frequency identification (RFID) applications is proposed. It is composed of a rectangular slot radiator, a shorting wall, and a pair of shorting strips, which occupy a small size of 40 ( L )×16...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2011, Vol.10, p.1135-1138
Main Authors: Hsien-Wen Liu, Chung-Hsun Weng, Chang-Fa Yang
Format: Article
Language:English
Subjects:
Antenna measurements
Dipole antennas
Electric fields
Handheld reader
microstrip antenna
Microstrip antennas
near-field
radio frequency identification (RFID)
Radiofrequency identification
Slot antennas
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Summary:In this letter, a compact edge-shorted slot microstrip antenna with good near-field performance for radio frequency identification (RFID) applications is proposed. It is composed of a rectangular slot radiator, a shorting wall, and a pair of shorting strips, which occupy a small size of 40 ( L )×16 ( W )×6 ( H ) mm 3 to be easily embedded inside a handheld reader device as an internal antenna. By properly designing a thin slot and a shorting wall, strong and uniform electric field distribution surrounding the near-zone region can be obtained with the antenna. This design can not only achieve an operating band of 2.38-2.55 GHz, but also generate large capacitive coupling effect to significantly enhance the near-field performance for actual application. Experiments exhibit that the proposed patch antenna may well function as a handheld reader antenna to detect the dipole-like tags through capacitive coupling for RFID near-field operation.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2011.2171310