The surgical stocking made by knitting a knitting yarn together with an extensible weft yarn is a placebo type stocking suitable for exerting compressive pressure at the ankle of less than 8 mmHg, and preferably less than 5 mmHg. A heat resisting ceramic or polyimide non-metallic short tube 15 is loosely mounted onto the outer periphery of a small diameter metal core wire 14 connected to an electromagnetic wave irradiating electrode 13 such that it covers the short tube at the root of the electrode 13. At least one cyclone chamber is positioned in the air flow passage. In this case, no data pulse is applied to an address electrode, so that there is no power consumed at the time of the rise and the fall of the data pulse. Data signals are transmitted to the receivers by applying the computed beamformer matrix to data symbols to maximize the lowest reception rate. The preferred composites include cobalt, nickel, or lithium zinc ferrite and PZT films which are arranged in a bilayer or in alternating layers, laminated, and sintered at high temperature.