Experimental study on wirless interference in RFID system

The objective of the proposed work is to find the effects on the reading performance of 900 MHz radio frequency identification system (RFID) under the wireless interference. Experiments were carried out in full anechoic chamber avoiding the influence of wireless signal produced by the reflection. In order to simplify the analysis of the process of performance, single tone signal was selected as the source of wireless interference. The performance was measured in terms of change in the successful reading rate of tags and the interrogation range of the reader. Typically the performance of the RFID will decline due to the wireless interference. However in our experiment it was found that the unwanted signal can significantly improve the performance of RFID system when its power reaches a certain range. To explain this phenomenon, we analyze the tag circuit as well as the back-scatter link, and the ratio m was defined to characterize the degradation of reading performance. It was concluded that the results we calculate using the method we proposed was matched with the experimental results.