8 meter ' 3x10 8 f Hz ' 3x10 5 f kHz ' 300 f MHz ' 0.3 f GHz f Hz ' 3x10 8 8 meter f kHz ' 3x10 5 8 meter f MHz ' 300 8 meter f GHz ' 0.3 8 meter 2-3.1 Figure 1. Electromagnetic Radiation SpectrumFREQUENCYSPECTRUM Figure 1, which follows, depicts the electromagnetic radiation spectrum and some of the commonly used or known areas. Figure 2 depicts the more common uses of the microwave spectrum. Figure 3 shows areas of the spectrum which are frequently referred to by band designations rather than by frequency. Section 7-1 provides an additional breakdown of the EO/IR spectrum. To convert from frequency (f) to wavelength (8) and vice versa, recall that f = c/8, or 8 = c/f; where c = speed of light. or Some quick rules of thumb follow: Metric: Wavelength in cm = 30 / frequency in GHz For example: at 10 GHz, the wavelength = 30/10 = 3 cm English: Wavelength in ft = 1 / frequency in GHz For example: at 10 GHz, the wavelength = 1/10 = 0.1 ft 0.3 0.4 0.5 0.6 0.8 1.0 2 3 4 5 6 8 10 20 30 40 50 60 80 100 GHz GHz GHz 1 m 10 cm 1 cm 20 30 100 200 300 500 FREQUENCY (MHz) 1.5 2 3 4 5 6 8 12 18 27 40 60 10080 FREQUENCY (GHz) 10 20 30 MILITARY STANDARD BANDS INTERNATIONAL STANDARD BANDS U.S. INDUSTRY STANDARD BANDS (IEEE Radar Designation) HF VHF UHF L S C X K u * K K a * 7 (HF) 8 (VHF) 9 (UHF) 10 (SHF) 11 (EHF) A B C D E F G H I J K L M 15 250 * "u" stands for unabsorbed or under K; "a" stands for absorption region or above K 200 300 V W 400 Millimeter 12 110 2-3.2 Figure 2. The Microwave Spectrum Figure 3. Frequency Band Designations . Figure 1. Electromagnetic Radiation Spectrum FREQUENCY SPECTRUM Figure 1, which follows, depicts the electromagnetic radiation spectrum and some of the commonly. of the microwave spectrum. Figure 3 shows areas of the spectrum which are frequently referred to by band designations rather than by frequency. Section