Sub-nanosecond coherent pulse generation at millimetre-wave frequencies

Described is a simple method to produce sub-nanosecond phase coherent pulses with rise times and fall times of at least 80 ps at power levels in excess of 200 mW at 94 GHz. The duration and timing of these pulses are controlled by fast input logic, and pulses as short as 110 ps have been achieved. The technique is easily extended to both higher and lower frequencies, and produces pulses with an infinite extinction ratio suitable for amplification to higher power levels.