Apparatus and method for production testing of devices with wireless capability

US11047894B2 · kind B2 · utility

Assignee

• BLUETEST AB · SE

Inventors

• John Kvarnstrand · Columbia, US
• Magnus Franzén · Kungsbacka, SE
• Eric Lundin · Grimnäs, SE

Key dates

• Filing date: Jan 15, 2019
• Grant date: Jun 29, 2021
• Expiry date: Jan 15, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B17/29
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and apparatus for production testing of a device under test (DUT) in a chamber is disclosed, the chamber defining an internal cavity therein, adapted to enclose the DUT, and including walls having inwardly facing surfaces of an electromagnetically reflective material, thereby supporting several resonant modes within the internal cavity. The method comprises: arranging the DUT at one or several measurement position(s) in the internal cavity; measuring radio frequency transmission between the DUT and at least one chamber antenna arranged in the internal cavity sequentially in a number of different static mode distribution configurations; comparing the measured radio frequency transmission at said predetermined mode distribution configurations with reference values obtained from measurement of a reference device arranged at the same measurement position(s) within the internal cavity, and at the same static mode distribution configurations; and determining whether the DUT is acceptable or non-acceptable based on said comparing.