Radio propagation equation (A4,B1)

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Radio propagation equation (A4,B1)

Course UNIK4700, UNIK9700
Title Radio propagation for mobile and wireless communications
Lecture date 2014/09/12 0915-1200
presented by Josef Noll
Objective The objective of this lecture is to explain the principles of radio propagation.
Learning outcomes What will we learn today
  • Modes of Propagation
  • Free Space Propagation
  • Transmit Power
  • EIRP
  • Permittivity
  • Permeability
  • Attenuation
  • Reflection, Scattering, Diffraction
Pensum (read before)
References (further info) References:
Keywords Propagation, Free space attenuation, propagation equation, transmit power, Attenuation, Permittivity, Permeability, EIRP, Reflection, Diffraction, Scattering

this page was created by Special:FormEdit/Lecture, and can be edited by Special:FormEdit/Lecture/Radio propagation equation (A4,B1).


Test yourself, answer these questions

  • Convert to dB, dBm: Pr = Pt . Gt . Gr . L(free)
  • What is the exact difference between permeability and permittivity?
  • What is Relative permittivity? and Relative Permeability?
  • Define Propagation constant

Lecture notes


Discussions from earlier years

How much is 0 dB_m and 10 dB_m?

  • Convert dBm to mW is: mW = 10^(x/10), x = number of dBm
  • Convert mW to dBm is: dBm = 10*log10(y), y = number of mW

So you get:

  • 0 dBm = 10^(0/10) = 1 mW
  • 10 dBm = 10^(10/10) = 10 mW

Power received in an area in a distance R from transmitter:

  • area of a sphere is
  • power transmitted from isotropic antenna is
  • antenna area of receiver is
  • power received in A_r = P_r


Free space propagation Calculation: http://spreadsheets.google.com/pub?key=p0EyjWrbirGKJXK43uluJfg Josef, check numbers in spreadsheet


S5-unik-preview.png
Slide Show

Title
UNIK4700/UNIK9700 Signal and Capacity
Author
Josef Noll,
Footer
Radio propagation equation (A4,B1)
Subfooter
UNIK4700/UNIK9700


⌘ UNIK 4700: Radio & Mobility

3rd lecture block

Radiowave propagation

Building Networks:Propagation


= Next lecture: Antennas =

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