1. Introduction Electromagnetic wave spectrumFrequency bandWavelengthMicrowavesP band (230 MHz–1 GHz)130–30 cmL band (1–2 GHz)30–15 cmS band (2–4 GHz)15–7.5 cmSuper high frequency (SHF) (3–30 GHz)(10–1 cm)Introductory Chapter: RF/Microwave Applications | IntechOpen www.intechopen.com › chapters