A Compact RFID Reader Antenna for UHF Near-Field and Far-Field Operations

Table 1

Comparison of near-field read-range.

Environment	Transmission power at 10 dBm	Transmission power at 20 dBm
Air	30 mm	48 mm
Water container	42 mm	56 mm
Paper	33 mm	36 mm
Plant surface (corn)	37 mm	38 mm
Hand skin (human)	24 mm	29 mm