Difference between revisions of "Radio propagation equation (A4,B1)"
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Radio propagation equation (A4,B1)
Course | UNIK4700, UNIK9700 |
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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
|
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
- Media:UNIK4700h14-RadioPropagation.pdf
- Video: mms://lux.unik.no/UNIK4700-JN/UNIK-20140912.wmv
- Streaming
- Media:UNIK4700-L3H13.pdf
- Media:UNIK4700-L4H12.pdf
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
- 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
= Next lecture: Antennas =