Spatial homogenization of the field strength of radiofrequency pulses

US9952298B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ludwig Eberler · Dresden, DE
• Jürgen Nistler · Erlangen, DE

Key dates

• Filing date: Dec 15, 2014
• Grant date: Apr 24, 2018
• Expiry date: May 24, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/28
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and a device are provided for spatial homogenization of the field strength of voltages of radiofrequency pulses of a number of RF transmitters, wherein (a) the measured complex voltages, induced by the electromagnetic field of the antenna, of a plurality of field probes, which are disposed in the vicinity of the antenna, are respectively superposed with a fitting phase shift and used for establishing the new desired homogenized voltages of the radiofrequency pulses of the antenna by a complex transfer function, and/or (b) output signals of at least two directional couplers on the RF feed lines of the antenna are superposed in a respectively fitting phase-shifted manner and these are used to establish complex impedances or scattering parameters of a complex scattering matrix of the antenna, which are used for establishing the new desired homogenized voltages of the radiofrequency pulses of the antenna.