Chapter1_Notes_v0

Of applied electromagnetics ulaby et al for ece331

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Unformatted text preview: c recall, 1 c= √ µ0 ≈ 3 × 108 (m/s.) (25) 0 • Wavelength and frequency are related through c λ= f (26) Note different uses for different frequencies/wavelengths. Switch over from frequency to wavelength at around 300 GHz. Microwave and millimeter bands (used loosely). Notes based on Fundamentals of Applied Electromagnetics (Ulaby et al) for ECE331, PSU. Electromagnetics I: Introduction: Waves and Phasors Optical window Infrared windows Radio window Ionosphere opaque Atmosphere opaque 100% 35 Atmospheric opacity 0 X-rays v i Ultraviolet s i Sterilization b l e Medical diagnosis Gamma rays Cancer therapy Radio spectrum Communication, radar, radio and TV broadcasting, radio astronomy Infrared Heating, Night vision 1 fm 1 pm 1Å 1 nm 1m m 1 mm 1m 10-15 10-12 10-10 10-9 10-6 10-3 1 1 km 1 Mm 103 106 Wavelength (m) 108 1 EHz 1023 1021 1 PHz 1 THz 1 GHz 1 MHz 1 kHz 1 Hz 1018 1015 1012 109 106 103 1 Figure 1-15 Frequency (Hz) Figure 14: EM spectrum. Notes based on Fundamentals of Applied Electromagnetics (Ulaby et al) for ECE331, PSU. Electromagnetics I: Introduction: Waves and Phasors Frequency (Hz) 1012 Band Medium Frequency MF (300 kHz - 3 MHz) AM broadcasting Radio beacons, weather broadcast stations for air navigation Navigation and position location Ultra Low Frequency ULF (300 Hz - 3 kHz) Audio signals on telephone Ionospheric sensing, electric power distribution, submarine communication Extremely Low Frequency ELF (3 - 30 Hz) 1 Hz Short wave broadcasting Super Low Frequency SLF (30 - 300 Hz) 1 kHz TV and FM broadcasting, mobile radio communication, air traffic control Very Low Frequency VLF (3 - 30 kHz) 103 TV broadcasting, radar, radio astronomy, microwave ovens, cellular telephone Low Frequency LF (30 - 300 kHz) 1 MHz Ultra High Frequency UHF (300 MHz - 3 GHz) High Frequency HF (3 - 30 MHz) 106 Radar, satellite communication systems, aircraft navigation, radio astronomy, remote sensing Very High Frequency VHF (30 - 300 MHz) 1 GHz 109 Radar, advanced communication systems, remote sensing, radio astronomy Super High Frequency SHF (3 - 30 GHz) Microwave Applications Extremely High Frequency EHF (30 - 300 GHz) 300 GHz Detection of buried metal objects f < 3 Hz Magnetotelluric sensing of the earth's structure Figure 1-16 Figure 15: RF spectrum. Notes based on Fundamentals of Applied Electromagnetics (Ulaby et al) for ECE331, PSU. 36 Electromagnetics I: Introduction: Waves and Phasors 37 ℑm -2 θI 3 θV ℜe |I| -3 I -4 Figure 1-18 |V| V Figure 16: Complex V and I. 1.5. Review of Complex Numbers We need to cover the basics: different forms and conversions between, Euler’s identity, complex conjugate, identity, addition, multiplication, division, powers and some other useful relations. Notes based on Fundamentals of Applied Electromagnetics (Ulaby et al) for ECE331, PSU. Electromagnetics I: Introduction: Waves and Phasors Notes based on Fundamentals of Applied Electromagnetics (Ulaby et al) for ECE331, PSU. 38 Electromagnetics I: Intro...
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This note was uploaded on 09/25/2013 for the course ECE 331 taught by Professor Martinsiderious during the Fall '12 term at Portland State.

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