Carmo, João PauloMendes, P.M.Couto, CarlosCorreia, José H.2008-08-182008-08-182006Sensors and Actuators A. ISSN 0924-4247. 132:1 p. 47-510924-4247http://hdl.handle.net/10198/692This paper describes a chip-size antenna for operation at 5.7 GHz, assembled with a low-power, low-voltage RF CMOS transceiver, fabricated in UMC RF CMOS 0.18 μm process. Measurements shown a patch antenna with the central frequency of 5.705 GHz, a bandwidth of 90 MHz at −10 dB of return loss, a directive gain of 0.3 dB, with an efficiency of 18%, and a transceiver with a measured total power consumption of 23 mW. This microsystem is intended for the use in each wireless node of a wireless sensor network mounted in a wireless electronic shirt, that monitors the cardio-respiratory function and posture.engWireless sensors networksOn-chip antennaRF transceiverjournal article10.1016/j.sna.2006.06.001