The present invention relates to an antenna measurement system and a corresponding method for measuring parameters of the transfer function of an antenna transmission system comprising a transmit antenna, a receive antenna and a transmission channel between said transmit antenna and said receive antenna, and/or for measuring parameters of an antenna of said antenna transmission system. In order to enable such a measurement for a single discrete frequency at high frequencies as used in mm-wave applications, an antenna measurement system is proposed comprising mixers, for frequency conversion on the transmitter side and detection on the receiver side, which are both driven by an electromagnetic radiation signal. Applying a switched DC signal for biasing the mixer on the transmitter side with an ultra-fast rise-time, the envelope of the time domain signal can directly be measured in the time domain on the receiver side.