A segmented loop antenna is presented for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications. The proposed segmented configuration makes the current along the loop remain in-phase even though the perimeter of the loop is comparable to the operating wavelength, so that a strong and uniform magnetic field is generated in the region surrounding the antenna. The antenna printed on a FR4 printed circuit board (PCB) with an overall size of 160×180×0.5 mm achieves good impedance matching and uniform magnetic field distribution over an operating bandwidth of 800–1040 MHz, which is desirable for UHF near-field RFID reader applications.
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Qing et al. (2009) studied this question.