SPHERICAL-SCAN NEAR-FIELD CHAMBER FOR CELLULAR PHONES

摘要

Motorola Cellular Subscriber Research Laboratory has developed and installed new hardware and software for measuring the performance of cellular and satellite phones. The hardware facilities consist of twin 16' cubical, near-field, anechoic chambers. Each has a spherical-scan system custom designed for cellular phone testing. The software consists of data collection, data presentation and database management software running under Windows NT 4.0™. Accurate testing of cellular phones requires that the measurements be made with a human phantom consisting of a human-shaped, liquid-filled fiberglass shell. These phantoms are fragile and must remain vertical. This required that an arm be implemented for the theta axis while a typical azimuth-only positioner is used for the phi axis. The Theta axis arm is shaped like a "U" and is mechanically driven from both ends allowing the cross-piece of the "U" to be of a lightweight dielectric material so as to have minimum scattering.