A compact dual open‐loop antenna is proposed to provide enhanced bandwidth in near‐field applications in the ultra‐high frequency band. The antenna generates a strong and uniform magnetic field in a near‐field zone of the smaller open‐loop antenna. For increased bandwidth, two open loops with individual half‐wavelength perimeters are etched on each side of an FR4 printed circuit board. The antenna was fabricated in a compact overall size (dimensions, 60 × 60 × 0.8 mm3) and achieves an interrogation zone of 50 × 50 mm2 with good impedance matching and uniform magnetic field distribution in a 888–932 MHz band. Performance tests indicate that the proposed antenna has a reading distance of up to 130 mm for near‐field applications and is suitable for radio frequency identification reader applications.
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Chen et al. (2015) studied this question.
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