A microwave system is capable of inspecting a medium, especially capable of inspecting food products transferred by a conveyer belt in real time. The microwave system includes a transmitter for transmitting continuous microwave; a receiver for receiving the microwave passing through the medium; a scanner for electrically directing a microwave beam along a linear path, especially, across the conveyer belt; a waveform extractor for extracting the informational parts of the received signal outputted by the receiver; and a cpu for analyzing the data outputted by waveform extracting means.