Parallel transmit using equal numbers of RF power amplifiers and coil elements has emerged as a common way to improve the homogeneity of the transmit field through RF shimming. When performing RF shimming, in many cases the magnitude of the transmit field is limited by the maximum power limit of a single RF amplifier. We propose networks that can be used to share power between transmit channels, increasing the maximum transmit field. These networks are shown to provide substantial flexibility in RF power allocation for certain conditions on the relative phases of the channels.
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