The present invention provides an umbrella fan which includes a pole, an upper hub, main umbrella support members, a lower hub, lower umbrella support arms and a main umbrella fabric cover attached to the main umbrella support members. Deposition of the buffer film is carried out by exposing the substrate along a deposition zone to a material plume generated by bombarding a target in the presence of a magnetic field, the deposition zone having a length of at least 1. The method further includes receiving downlink data from an LTE radio link.