"I can feed a microwave LED output of a mobile phone?
I want to build something that reflects the microwaves from a cell phone and converts DC power to an LED. I have a double wave rectifier, how should my antenna work? No, no, I want is to become reality microwave power current. Without input, except the microwave. Something like a crystal radio.
Basically you need to make a circuit detection, something like a crystal radio. The first link below explains it. You need some selectivity – an adjustment circuit – setting out the bands interest (900 MHz and 1.8/1.9GHz for a cell phone). diode detectors always a question of sensitivity: You must have enough tension to overcome the diode Vf. For Vf Schottky diode is as low as 300 mV, a standard silicon diode is 600mV, and an LED is much higher: 1.2 V or more, depending on the type of diode. In fact, its full-wave solution makes things worse, and that adds two diode drops plus the LED, so the detector would not trigger unless you had 2.4V available. The LED only half of the wave would make better. This could be enough if, for example, wants the listener right into the phone. How to overcome this? The trick is to add a bias V CC to overcome, so that the small RF voltage stress failure of the V, over the hump in the light of the diode. I realize this pours water cold on the idea of the detector to be self-powered, but will work better than a passive solution. I think a better circuit would use a Schottky diode for detection buffer output continued to drive the LED. Even better than that, I have also linked an IC that can do this. It's very low current and can be powered by a Li coin cell. It is also very small.
10 watt high power LED test, 800 mA @ 12 Volt
