System and method for a radio frequency filter

US9941908B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventor

• Ruediger Bauder · Feldkirchen-Westerham, DE

Key dates

• Filing date: Oct 2, 2015
• Grant date: Apr 10, 2018
• Expiry date: Oct 2, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/38
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In accordance with an embodiment, a circuit includes a plurality of filter circuits having a first port, a second port and a third port, where a second port of a first of the plurality of filter circuits is coupled to a first port of a second of the plurality of filter circuits, and each of the plurality of filter circuits includes a first passive filter, a second passive filter, a first coupler and a combining network. The first coupler includes an input port coupled to the first port, an isolated port coupled to the second port, a first phase shifted port coupled to the first passive filter and a second phase shifted port coupled to the second passive filter, and the combining network includes a first input coupled to the first passive filter, a second input coupled to the second passive filter, and an output coupled to the third port.