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Electromagnetic

Electromagnetic. Lanjutan SAP. Dari buku Stuart Wentworth: Pertemuan 10 Plane Waves: 5.1 -5.4 Pertemuan 11 Plane waves: 5.5 – 5.8. Dari buku Stuart: Pertemuan 12 Transmission lines: 6.1 - 6.3 Pertemuan 13 Transmission lines: 6.4 - 6.5 Pertemuan 14 Transmission lines: 6.6 - 6.8.

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Electromagnetic

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  1. Electromagnetic

  2. Lanjutan SAP Dari buku Stuart Wentworth: • Pertemuan 10 Plane Waves: 5.1 -5.4 • Pertemuan 11 Plane waves: 5.5 – 5.8

  3. Dari buku Stuart: • Pertemuan 12 Transmission lines: 6.1 - 6.3 • Pertemuan 13 Transmission lines: 6.4 - 6.5 • Pertemuan 14 Transmission lines: 6.6 - 6.8

  4. Pertemuan 15 Waveguide : 7.1 -7.2 • Pertemuan 16 Waveguide : 7.3 -7.4 • Pertemuan 17 Waveguide : 7.5 -7.6

  5. Pertemuan 18 Antena : 8.1 - 8.4 • Pertemuan 19 Electromagnetic Interference: 9.1 – 9.3 • Pertemuan 20 Electromagnetic Interference: 9.4 – 9.6

  6. Figure 2-47 (p. 77)Simplified schematic of an electret microphone circuit.

  7. Plane Waves

  8. Learning Objectives • Derive the general equations for electromagnetic wave propagation • Study electromagnetic wave propagation in conductors and define skin depth • Describe electromagnetic wave power transmission using the Poynting theorem • Define the polarization of an electromagnetic wave • Study reflection and transmission of waves incident from one material to another

  9. 5.1 General Wave Equations • Material media that are linear, isotropic, homogeneous and time invariant

  10. 5.2 Propagation in Lossless, Charge-Free Media • Charge-free (v = 0) medium has zero conductivity(  = 0 ) • perfect dielectric is lossless

  11. 5.3 Propagation in Dielectrics • Dielectrics are to some degree lossy • The lossy nature can be attributed to finite conductivity, polarization loss or a combination of the two. • Low loss dielectrics is one with a small loss tangent (/<<1)

  12. A standard measure of lossiness in a dielectric is given by the loss tangent. It is useful for classifying a material as either a good dielectric (tan <<1 ) or a good conductor (tan >>1 )

  13. 5.4 Propagation in Conductors • In any decent conductor at reasonable frequencies the loss tangent, / , is much greater than one. • Example, stainless steel with a conductivity of 106 S/m.

  14. Latihan 5.3: A wave with l = 6.0 cm in air is incident on a nonmagnetic, lossless liquid media. In the liquid, the wavelength is measured as 1.0 cm. What is the wave’s frequency (a) in air? (b) in the liquid? (c) What is the liquid’s relative permittivity?

  15. Answer (a) (b) the frequency doesn’t change with the media (the wavelength does) so f = 5 GHz (c)

  16. Terima kasih Selesai

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