The self-decoupled coil that is intrinsically decoupled proves to be a simple way to solve coupling issues in RF arrays. Small mode capacitances are needed to balance the dipole- and loop-mode coupling in self-decoupled coils, which then requires the addition of inductors to maintain the resonant frequency. But inductors may lead to loss and thus decrease transmit efficiency. In this work, we investigated the performance of small self-decoupled coils at 7T and compared it to ideal conventional coils. It was found that the coil performance of self-decoupled array could be well preserved so long as the sample loss is dominated. Based on these simulation and experimental results, the self-decoupled coil is a good candidate for dense coil arrays at ultrahigh fields.