Ceramic  capacitors:

Porcelain is material which works well as a dielectric. Sheets of metal are stacked with wafers of ceramic alternately to make these capacitors. The meshing geometry of Figure is used. Ceramic, such as mica, has quite low loss, and thus allows for the high efficiency.

For the low values of capacitance, only one layer of ceramic is required, and two metal plates are glued to the disk-shaped porcelain, one on each side. Specifically this type of component is called as a disk-ceramic capacitor. On the other hand, a tube or cylinder of ceramic can be employed, and metal ink applied inside and outside of the tube. Such units are known as tubular capacitors.

Ceramic capacitors have values varying from a few picofarads to about 0.5 µF. The voltage ratings of them can be comparaed to those of the paper capacitors.

Paper capacitors

In the beginning of radio, capacitors were usually made by placing paper, soaked with mineral oil, between 2 strips of foil, rolling the assembly up, attaching wire leads to the 2 pieces of foil, and enclosing the rolled-up foil and paper in the cylindrical case.

These capacitors c sometimes be found in the electronic equipment. They have values ranging from around 0.001 µF to 0.1 µF, and can handle low to moderate voltages, generally up to about 1000 V.