The diode’s two wires go to an analog meter set to the 1-volt scale. When the screwdriver is still less than half a meter from the oscillator end, and at the node for the first half-wavelength ...

The four diodes act as switches between the balanced signal input and the output, and have the effect of reversing the polarity of the path between them on each cycle of the local oscillator.

They designed and fabricated a compact terahertz oscillator that integrates a micro slot antenna (a type of wireless communication antenna) and a resonant tunneling diode. This reduced the delay of ...