1 / 18

ELECTROMAGNETISM

ELECTROMAGNETISM. ?. Studies the interaction between electric charges in arbitrary motion. Radio Link. Applications of electromagnetism. ELM for ENERGY ELM for INFORMATION. Electromagnetism for energy. Electrical machines Electric energy distribution

brianne-haughey
Download Presentation

ELECTROMAGNETISM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELECTROMAGNETISM ? Studies the interaction between electric charges in arbitrary motion

  2. Radio Link

  3. Applications of electromagnetism • ELM for ENERGY • ELM for INFORMATION

  4. Electromagnetism for energy • Electrical machines • Electric energy distribution • Heating (induction ovens, microwave ovens…) • Biomedical applications (treatment) • Particle accelerators • Plasma heating (nuclear fusion)

  5. Electromagnetism for information • Telecommunications • Electromagnetic remote sensing • Biomedical applications (diagnosis) • Metrology applications • “Computer” applications • High speed electronics applications

  6. Frequency range • “Low frequency” lumped parameter circuits if size of circuit << cT=c/f=l

  7. Frequency range • “high frequency” distributed parameter circuits if size of circuit comparable with cT=l c=300 000 km/s = 30 cm/ns = 300 mm/ps

  8. Types of propagation • Free space propagation Attenuation with geometrical origin

  9. P T P R Types of propagation • Guided wave propagation D (=1 with negligible losses)

  10. Radio Electric Spectrum • f: 3 - 30 kHz VLF l: 100 - 10 km Very Low Frequency: Radio navigation • f: 30 - 300 kHz LF l: 10 - 1 km Low Frequency: Radio navigation, Long wave broadcasting

  11. Radio Electric Spectrum • f: 300 - 3000 kHz MF l: 1 - 0.1 km Medium frequencies: AM Broadcasting, maritime communications • f: 3 - 30 MHz HF l: 100 - 10 m High Frequencies: AM Broadcasting, Amateur radio

  12. Radio Electric Spectrum • f: 30 - 300 MHz VHF l: 10 -1 m Very high Frequencies: TV, FM Broadcasting, Police, Taxi • f: 300 - 3000 MHz UHF l: 100 - 10 cm Ultra High Frequencies: TV, radar, cell phones

  13. Radio Electric Spectrum • f: 3 - 30 GHz SHF l: 10 - 1 cm Super High Frequencies: Radar, radio links, satellites • f: 30 - 300 GHz EHF l: 10 - 1 mm Extremely High Frequencies: Radar, urban communications, remote sensing

  14. Radio Electric Spectrum • l: 1000 - 0.77 mm IR • l: 0.77 - 0.39 mm visible • l: 390 - 10 nm UV • l:X rays

  15. Radio Electric Spectrum • l: g rays • l: cosmic rays

  16. Some dates • 1873 - Maxwell Equations • 1887 - 1891 Hertz experiments • 1885 - 1887 Heaviside • 1894 - 1902 Marconi experiments • 1897 Lord Rayleigh: waveguides • 1940 - 45 Radar • 1950 ... Stripline and Microstrip

  17. microstrip stripline

  18. Some dates • 1960 ... Microwave integrated Circuits (MIC) • 1970 ... Monolithic Microwave Integrated Circuits (MMIC) • 1980 Low loss optical fibers: • a = 0.2 dB/km • Today: hundreds of millions km of fibers deployed

More Related