1. Introduction Electromagnetic wave spectrumFrequency bandWavelengthMicrowavesUltrahigh frequency (UHF) (300–3000 MHz)(100–10 cm)P band (230 MHz–1 GHz)130–30 cmL band (1–2 GHz)30–15 cmS band (2–4 GHz)15–7.5 cmIntroductory Chapter: RF/Microwave Applications | IntechOpen www.intechopen.com › chapters