An adjustable door closer has a hollow pedestal with a first and a second chamber as well as an actuating groove. The nonwoven fabric is adapted to be bonded to another item that includes a similar auto-adhesive material. The sign may be supported by a tripod structure portion that enables the sign to be utilized in a stand-alone state. The plurality of feed probes may produce orthogonal vector components of a field to provide circular polarization. The band-pass filter further includes two pairs of second ground electrodes which are disposed on both sides of the input electrode andor output electrode and which are electrically connected to the first ground electrode. The stepping motor is capable of rotating with not only high speed but also less undesired vibration and noises, and enabling a simpler, smaller manufacturing equipment thereof to be constructed.