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Analysis and practical implementations of small all-platform UHF RFID transponders are presented. Four prototypes that are combinations of two topologies of integrated impedance matching circuits and two fabrication methods are introduced. With printed circuit board (PCB) technology that is the first of the fabrication methods, prototypes with two and three metal layers are presented. Measurements...
A wireless radio transmitter with an integrated variable-impedance antenna is demonstrated. The transmit signal is connected via a switch to the antenna at one of several feed points that correspond to different load impedances that are optimal for the power amplifier at different transmit power levels. It is shown that this can be used to improve the efficiency of the transmission at low and medium...
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