ABSTRACT
The term microwaves indicates wavelength in the micron ranges. In this book, microwaves mean those wavelengths measured from 1 m to 0.1mm, which correspond to the frequency range of 0.3 to 3000 gigahertz. The microwave frequency range is usually grouped into different wave bands: (1) the decimeter wave band for microwave frequencies from 0.3 to 3 GHz, (2) the centimeter wave band for microwave frequencies from 3 to 30 GHz, and (3) the millimeter wave band for microwave frequencies from 30 to 300 GHz. There is also a subset of microwave wavelengths measured from 1 to 0.1 mm (the submillimeter wave band) for the 300 to 3000 GHz frequency range. Microwaves are bounded on the long wavelength side by radio (meter) waves and on the short wavelength side by infrared (IR) waves. The frequency bands commonly used in electronics industries and academic institutes are shown in Tables 1.1 and 1.2.
