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The six-port phase correlator is composed of three 90?? hybrid couplers and a Wilkinsion power divider. In this paper, various six-port phase correlators with Wilkinsion power divider, 90?? hybrid coupler and/or 180?? rat-race ring coupler were designed and simulated at the center frequency of 2.5 GHz. The simulation results show that the six-port correlator structure with one 90?? hybrid coupler,...
The radio link between reader and tag for UHF band RFID is discussed and analyzed, focusing in particular on minimum transmitting power and improving the sensitivity of the receiver in order to emphasis on the necessity of increasing the isolation between TX and RX for high performance of reader; based on the conventional microstrip directional coupler, a method is introduced to achieve high isolation...
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