IXS-070 - Spherical Scanning System

The IndexSAR Spherical scanner is a four axis robotic system controlling a low dielectric arm moving a calibrated broadband isotropic probe around a device under test in a conical motion. The arm describes a cone as required in the CTIA standard. Full spherical data is gathered by rotating the EUT through 360 degrees.

The 3-axis orthogonal 'air' probe means that no receive /spectrum analyser is required, and only one device needs to be calibrated. This simple system uses only one USB serial port for data and control.

For optimum performance, the DUT is mounted vertically on a ‘Rohacell’ low-dielectric pillar 2.4metre high, and rotated via a floor mounted motorised turntable. The turntable has a small ‘Footprint’ equal to a standard anechoic block 600m x 600mm. Rohacell material has a dielectric factor of 1.05 (close to air) combined with the ability to be fabricated into structures that can take considerable weight compared to itself (the SAM Phantom filled with liquid weighs 10Kg.).

3D Plot Examples
Total Radiated Power (TRP) of mobile handset with and without SAM phantom (no hand)
Phone @ 900MHz [with SAM Phantom] NB: Radiated power reduced by 50%		Phone @ 900MHz in Free Space
Full range of set-up screens for full flexibility in probe positioning. Teach facility allows the setting of ‘waypoints’ in real time, with ‘playback’ positioning around DUT shapes as required.		Data ‘Viewer’ software supplied for data manipulation and analysis - allows user to present data in any orientation. Power at +/-30º & 45º sectors from horizon automatically calculated as required in CTIA test plan.
Comparative Table TRP patterns on Tri-Band GSM900/1800/1900 reference phone
IndexSAR ‘Conical cut’ CTIA system		Typical ‘Great Circle’ CTIA system
880MHz
1880MHz