Patent ID: 8515377
Filing Date: 2013-08-20
Classification: H01P,H04B

Abstract:
1. A radio base station comprising: an antenna; a first power amplifier configured to receive a first carrier signal; a second power amplifier configured to receive a second carrier signal; an imbalanced combiner configured to apply a power imbalanced combined signal to the antenna, the power imbalanced combined signal having a power imbalance at least between a first power level of the first carrier signal and a second power level of the second carrier signal at the antenna; and a coupler, the coupler comprising: a first coupling element, the first coupling element comprising a first end connected to an output of the first power amplifier and a second end connected to the antenna; a second coupling element, the second coupling element comprising a first end connected to an output of the second power amplifier and a second end terminated without connection to the antenna; a coupling medium positioned between the first coupling element and the second coupling element, the coupling medium being configured to be interchangeable and positioned between the first coupling element which carriers the first carrier signal and the second coupling element which carriers the second carrier signal.