.pi./2 power divider

US4945321A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ralph Oppelt · Uttenreuth, DE
• Markus Vester · Koblenzer Straße, DE

Key dates

• Filing date: Apr 5, 1989
• Grant date: Jul 31, 1990
• Expiry date: Apr 5, 2009

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H7/21
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

In a .pi./2 power divider, particularly a .pi./2 hybrid for the radio-frequency antenna of a nuclear magnetic resonance tomography apparatus, a decoupling circuit having unbalanced-to-ground line transformers is provided. Each branch thereof contains an all pass network consisting unbalanced-to-ground line transformers at the output. A broadband .pi./2 hybrid is obtained particularly with a broadband 3 dB/180.degree. hybrid as the decoupling circuit.