Abstract
An ultra-high frequency (UHF) travelling wave antenna based on complementary split ring resonator (CSRR) element is investigated in this study for pure near-field radio frequency identification (RFID) system. The proposed antenna consists of a T-type power divider, 180 ° phase shifter, two microstrip transmission lines ended with two 50 Ω resistors and the metal ground loaded CSRR elements. The CSRR elements are loaded on the metal floor corresponding to the minimum current points and middle of the two transmission lines. The CSRR elements resonate at the centre frequency and introduce coupling to enhance the magnetic field. The measured − 10 dB impedance bandwidth of the proposed antenna is 46 MHz (889–935 MHz), which covers the standards of Chinese and American bands. The reading regions for near-field tag, far-field tag and anti-metal tag are 400 × 200 × 10 mm 3 , 400 × 200 × 70 mm 3 and 400 × 200 × 60 mm 3 , respectively. The far-field gain is less than − 22 dBi, which makes the antenna suitable for the pure near-field application.
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