Low-Power-Level Passive Harmonic Reradiator for Sensor Nodes
نویسندگان
چکیده
Sensor nodes distributed over a large area can be used to collect environmental information such as chemical pollution. The sensed information can be communicated to a central location, without significant power consumption by the sensor nodes, by utilizing backscatter modulation. In this approach, a central source such as a radar illuminates the sensor nodes by microwave radiation. The reradiation from each sensor can be modulated by switching a load on the sensor antenna. This permits design of low-power sensors having a long battery life. To avoid interference at the radar from unwanted objects, harmonic reradiation can be used on the sensor nodes and the reradiated harmonic can be processed. A passive harmonic reradiator is designed to reradiate an incident 10 GHz electromagnetic wave at 20 GHz. The design is for low incident power density. The design comprises of receiving and transmitting integrated patch antennas, a low-barrier Schottky diode and double stub impedance matching. Measurement of the reradiated power, with a representatively input low power density, showed promising characteristics for the use of harmonic reradiator as described above.
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