Epcos Ag

Denys Orlenko

Patric Heide

Georgiy Sevskiy

Roman Kravchenko

Sergiy Royak

A multiband circuit includes a signal path comprising a first signal branch that includes a first circuit that is transmissive in a first frequency band and a second signal branch that includes a second circuit that is transmissive in a second frequency band. The first and second signal branches are combined on an antenna side into a common path.

Multi-band circuit with first and second signal branches

A bandpass filter is described herein. The bandpass filter has two parallel signal branches, each connected, on an input side, to an input node and, on an output side, to an output node. The two signal branches form a ring resonator, having a wave mode with a complex amplitude of {right arrow over (U)}=|{right arrow over (U)}|exp{&#x2212;j&#x3c6;} propagating in a clockwise direction and a wave mode with a complex amplitude of {right arrow over (U)}=|{right arrow over (U)}|exp{&#x2212;j&#x3c6;} propagating in a counterclockwise direction. The vector sum of a resulting wave {right arrow over (U)}at the output node of the bandpass filter at two or more stop frequencies is: {right arrow over (U)}={right arrow over (U)}+{right arrow over (U)}=0, and |{right arrow over (U)}|=|{right arrow over (U)}| and |&#x3c6;&#x2212;&#x3c6;|=180&#xb0;. The stop frequencies are arranged such that a passband is formed between two stop frequencies.

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Munich, Germany

Denys Orlenko