Modulation of anode current at 1 GHz was observed on two different devices. The devices tested were 1,197-tip arrays of 4 micrometer column emitters. Net signal gain of 0.84 dB was recorded at a bias current of 172 micro-A. As more devices are tested, it is expected that increased RF gain will be observed. An identical array was tested at lower frequencies (1 - 50 MHz). Extrapolating from the gain ...
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