24 GHz Direct Conversion Transceiver for Sensor Networks

A complete low power 24 GHz transceiver chain intended for wireless sensor networks is presented. Including standard button cell batteries, the node size is only 1cm³. A specially designed PCB antenna is implemented, which is fed through the substrate from the backside. The RF components are flip chip mounted directly to the feedline to reduce losses. Data transmission at 2400 bps has been demonstrated, low complexity of the circuitry makes future system on chip (SoC) integration feasible.