Summary:
Kim et al. use dual-direction antennas to find the direction of arrival for RF signals transmitted from an RFID tag. The two spiral antennas are perpendicular to each other and their signal strengths are different depending on the angle to the RFID tag.
Obstacles in front of the antennas/tag increase the error in determining the direction. The object can still be tracked, though. In experimental results it worked pretty well.
Discussion:
It works pretty well for its domain. Probably less accurate for incredibly small movements (e.g., finger bends). Seems like every now and then it goes crazy off-track (Figure 8).
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