Air Coils are a kind of inductors which can be used at high frequency even up to 10GHz, having the virtue of simple structure, high precision, low distributing capacitance, high SRF, low temperature coefficient, using different diameters of enamelled copper wires with rated current up to 50A, widely used in TVs(tuners & modulators), mobile phones, intercoms, telephones, clocks, watches, satellite receivers, communications, motors, speakers, etc.