A chipless light sensing tag based on radio frequency identification（ RFID） technology is designed. Due to compact design

tag contains 6 bit data capacity in a smaller volume. Combining with RFID chipless technology and sensor technology

the tag not only has ID encoding capacity

but also has light intensity detection capability for environment. The designed tags structure and manufacturing process are simple

it has advantages of low cost

maintenance free

reusable

and so on. Three-dimensional electromagnetic simulation software HFSS is used to simulate on the tags

and two cross-polarized loop antennas are used to test the tags. Simulation and test results prove that in frequency band range of 1. 5

2. 8 GHz

tags can realize ID cod

ing and ambient light intensity sensing at the range of 0

1 000 lux. The tag has good sensitivity

reproducibility and linearity.