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A wideband adaptive isolator for a UHF RFID reader with a minimum component count is introduced. The operation of the device is based on a reflection from a variable load, which is connected to a port of a hybrid coupler. The other ports are connected to the receiver (RX), transmitter (TX) and antenna ports of the reader. The isolator provides an isolation of 50 dB from TX to RX at the 800 MHz-1 GHz...
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,...
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