So-called channel-sounders are employed for the measurement-technical characterization of mobile communications channels. In order to describe a radio channel three-dimensionally in case of a measurement scan, a spatial scanning of the wave field pattern is necessary and thus a 3D antenna array is required. The antenna arrays developed consist of 96 polarization-sensitive individual elements, which are arranged on a cylinder in 4 rings each with 24 elements. Every single antenna has a minimum bandwidth of 120 MHz, and has a separate connection for the vertical and horizontal polarization in each case. All 192 single channels are switched through an integrated changeover switch, if desired, to a common port. The antenna arrays have a reference port for calibration. The antenna arrays can be equipped with inclination sensors and laser pointers. Likewise, four camera modules can be integrated for the recording of the scan path covered.
The signals are filtered and pre-amplified with low-noise. The activation is implemented over a SUB-D socket. The connector type is female SMA. The antenna arrays are provided with a radome and thus resistant to external climatic influences.