Patent ID: 8565347
Filing Date: 2013-10-22
Classification: H04B

Abstract:
1. Antenna measurement system 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, said antenna measurement system comprising: a radiation source that provides an electromagnetic radiation signal having two spectral lines at different frequencies, a first mixer that receives said electromagnetic radiation signal from said radiation source, generates a first mixer signal having spectral lines at the sum and the difference of said spectral lines of said electromagnetic radiation signal, and outputs a first output signal to the transmit antenna having the spectral line of said difference but not the spectral line of said sum, said transmit antenna transmitting a transmit signal over the transmission channel to the receive antenna, a pulse generator that generates a pulse signal and provides it to the first mixer for biasing and amplitude modulation of the first output signal, a second mixer that receives said electromagnetic radiation signal from said radiation source and a receive signal received by said receive antenna, generates a second mixer signal that corresponds to the first mixer signal and outputs a second output signal, and a measurement circuit that measures a current of said second output signal and evaluates said current within a time period when the envelope of the second output signal corresponding to a line-of-sight signal component has settled and before it is substantially changing to obtain at least one parameter of the transfer function of said antenna transmission system and/or of an antenna of said antenna transmission system.