Il-Jong Song

Rectenna Design for Passive RFID Transponders

This work emphasises rectenna design issues of passive RFID transponders for 868/915-MHz and 2.45-GHz ISM bands. The characterisation of transponder chip takes into account the impact of connecting antenna to rectifier by flip-chip bonding process. Proposed experimental way allows finding chip impedance exactly as it seen by antenna. Refined rectifier circuitry effectively overcomes dependence of transponder performances on the type deviation of connected antennas.

Transmitter-leakage compensator of UHF RFID reader for mobile applications

This paper presents a new approach for reducing transmitter-leakage in UHF RFID readers for mobile devices. In the approach, it is possible to reduce the leakage dynamically by utilizing pilot signals for detecting the leakage and then applying reverse-phase signals for its compensation. Experimental results show more than 30dB of the leakage elimination and 25~600% of enhancement in the reading range when tested with a 8dBi stationary and a -3.5dBi mobile antennae in an anechoic chamber.

10-Gbps uncooled DFB LD module by the optimal EOTM design

The optimized 10 Gbps uncooled DFB LD module is achieved and its performance is verified by transmission experiments over 20 km of conventional single mode fiber. The module output power is +2 dBm and extinction ratio is over 7 dB at 10 Gbps and 75degC