Hi,

Iím working on a new software defined antenna project that uses wireless relay boxes instead of traps. The key to success is very low power operation. In order to keep the power low, I need a means of detecting a wireless (non conductive) wake up signal that requires very little current drain (a few microamps or less ideally). The wake up detector senses the signal to awaken, at which point sub-GHz ISM band RF communications that consumes up to 5 milliamperes of power ensues to receive the actual switching information via Arduino or PIC MCU, which drives a latching relay to switch antenna segments in/out.

I have researched the latest state of the art Wakeup RX papers. They all seem to suffer from limited distance - just a few meters. Attempting to further amplify the incoming wakeup signals involves preamps whose quiesce currents are in the milliamperes range and thus far all experiments and research suggests this is not technically feasible today via an RF wakeup approach.

Whatever solution there may be, it must be inexpensive to implement. Iím even willing to consider not RF wakeup stimulus, such as pneumatic, ultrasonic, infrared or other.

Any ideas or suggestions greatly appreciated.

Rick, W5FCX