Parallel transmission (pTx) with an array of radiofrequency (RF) coils enables spatially uniform excitation with lower SAR in high-field MRI. Performance improves with the number of coils. Currently, 7T scanners have a limited number of transmit channels due to their high cost and complexity. Array-compressed pTx (acpTx) networks comprise unequal power splitters that sit between the transmit amplifiers and coils, enabling a small number of channels to optimally drive a large number of coils. This study presents the design of low-loss unequal power splitter building blocks with minimal size that can be combined in stages for a variety of applications.