The deployment of RFID technology will gain a significant boost if indoor location positioning is incorporated into RFID systems. Recent development in range estimation indicates that phase difference of arrival (PDOA) shows a promising performance. PDOA technique suffers from an inherited limitation of phase difference which is restricted to the maximum of 2π radians. In this paper a robust algorithm to overcome this limitation and unwrap the phase is presented. A theoretical model has been developed to accurately unwrap the phase using the round trip time of flight. Simulation results show that the proposed method can be used to estimate the range even under significant Round Trip Time of Flight (RTTF) measurement error. It is shown that a wide range of time measurement errors can converge to actual distance if the frequency difference of the transmitted waves is properly selected.
a b s t r a c t At frequencies above a few gigahertz, testing integrated circuits becomes a challenging task. Test signal integrity degradation due to parasitic effects of interconnects and electromagnetic coupling undermine the test results and increase the yield loss of integrated circuits at high speeds. A new test interface module based on MEMS technology is proposed in this paper. High-speed micro test-channels are designed to establish connectivity between the device under test and the tester at the die level. Experimental results indicate that the proposed architecture can be used to test integrated circuits up to 50 GHz without much loss or distortion.
One of the main advantages of Radio Frequency Identification (RFID) systems over the traditional barcode identification systems is that the direct line of site is not required for RFID tags. The potential of this key factor will not be fully materialized if the communication range of RFID systems remains below a few meters. For RFID tags to fully replace barcode labels, the communication range has to increase significantly. This work presents a new method to increase the communication range of RFID systems using a beam scanning method. A multi planner RFID scanning system using a directional antenna has been developed. As compared to the conventional RFID systems, the proposed scheme covers a larger area with a lower number of blind spots without consuming extra power.
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