A cyclone dust collecting apparatus comprises a first cyclone for centrifuging dust from drawn-in air; one or more second cyclones for separating dust from air which is passed through the first cyclone; and an electrode unit mounted to at least one of the first and the second cyclones. Further, according to certain non-limiting embodiments, the at least partial coating adapted to polarize at least transmitted radiation comprises at least one at least partially aligned dichroic material. The detecting base station includes a mobile communication device detector configured to intercept the uplink communication signal transmitted from the wireless communication device to the originating base station of a communication network. Each of the projections extends from the common substrate in a general direction that is locally substantially perpendicular to the surface defined by the ends of the flaps.