A diaper includes a chassis, a liquid-absorbent structure and containment cuffs. The fluid from the first container in a positive g-force environment is a mixture of air and oil, and the fluid from the first container in a negative g-force environment is primarily oil. Further, a PIN diplexing switch separates signals into different base-band and highband paths. The apparatus in accordance with the invention is characterized by the fact that it encompasses guide or focusing buffers arranged between the separation medium and at least one electrode.