Microwave instantaneous frequency measurement apparatus

摘要

The present invention provides microwave instantaneous frequency measurement apparatus which includes a power divider (2) for dividing an RF input signal line (4) for delaying the first signal, a 3 decibel hybrid coupler (5) for quadrature summing and differencing the delayed first signal and the second signal, a pair of logarithmic amplifiers (10, 11) connected to receive sum and difference outputs from the coupler, and a substrator (12) arranged to subtract the outputs from the amplifiers.