Radio Frequency versus Microwaves?
Radio frequency (RF) and microwaves are forms of electromagnetic energy but differ in operating frequency and wavelength. Both are allocated specific bands of operation by international governments. In the USA, these are monitored and controlled by the Federal Communication Commission or FCC. Industrial radio frequencies typically operate between 10 and 30 MHz with wavelengths of 100 to 35 feet (30 to 10 meters). In comparison, units designed and built by Industrial Microwave Systems use frequencies between 460 and 2,450 MHz with corresponding wavelengths between 24 and 4 inches (60 to 10 cm). Generally speaking, the efficiency of power utilization is far lower in a RF generator than a microwave unit, although the initial capital cost per KW of power output is higher. Selection of RF or microwave heating will depend on product physical properties and required process conditions for a particular application. Where penetration depth in excess of 6 inches (15 cm) is required and control o
