Telefonaktiebolaget Lm Ericsson (publ)

Andrzej Plotka

Peter Pääkkönen

Jurek Dabrowski

A balanced amplifier includes a bypass branch (), termination elements (TE, TE) and an amplifying section (). The section () includes amplifiers (A, A), first coupling/splitting unit () having a first input signal receiving port (), a second port () connected to a termination element (TE), a third port () connected to a first amplifier (A), and a fourth port () connected to a second amplifier (A). The section () also includes second coupling/splitting unit () having a first port () connected to first amplifier (A), a second port () connected to second amplifier (A) and a third port () connected to a termination element (TE). The second coupling/splitting unit () combines signals from amplifiers (A, A) as output signals on a fourth port () for supply to a signal output (O). The branch () is connected to the second port () of the first coupling/splitting unit () and provides bypass signals to output (O).

Balanced amplifying device having a bypass branch

A directional coupler for radio frequency application, comprising: an input () for receiving a radio frequency input signal; a port () for delivering a radio frequency output signal; a first elongated conductor (), suspended in air between two ground planes, for connecting the input () with the port (); the first conductor () comprising a sandwich structure with a first upper conductive strip (A), a first intermediate layer comprising a dielectric material and a first lower conductive strip (B); a second elongated conductor (), suspended in air between two ground planes, the second elongated conductor () comprising a sandwich structure with a second upper conductive strip (A), a second intermediate layer comprising a dielectric material and a second lower conductive strip (B); said first elongated conductor () and said second elongated conductor () being substantially parallel; said first upper and lower conductive strips and said second upper and lower conductive strips, respectively, having conductive interconnections ().

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Stockholm, Sweden

Andrzej Plotka