  Surfaces capable of delaying the frosting passively and facilitating its
removal are highly desirable in fields where ice introduces inefficiencies and
risks. Coalescence jumping, enabled by highly hydrophobic surfaces, is already
exploited to slow down the frosting but it is insufficient to completely
eliminate the propagation by ice-bridging. We show how the self-ejection of
single condensation droplets can frustrate the ice bridges of all the
condensation droplets leading to a frost velocity lower than 0.5 um/s thus
dropping below the current limits of passive surfaces by a factor of at least
2. Arrays of truncated microcones, covered by uniformly hydrophobic
nanostructures, enable individual condensation droplets to growth and
self-propel towards the top of the microstructures and to self-eject once a
precise volume is reached. The independency of self-ejection on the neighbour
droplets allows a precise control on the droplets' size and distance
distributions and the ice-bridging frustration. The most performant
microstructures tend to cones with a sharp tip on which the percentage of
self-ejection is maximum. Looking towards applications, tapered microstructures
allow maximising the percentage of self-ejecting drops while maintaining a
certain mechanical strength. Further, it is shown that inserted pinning sites
are not essential, which greatly facilitates manufacturing.
