Transmission Media Microwave Link Budget Akram Radhi Nasser Master of Electronic and Communication First course
Transmission Media
Microwave Link Budget
Akram Radhi Nasser Master of Electronic and Communication
First course
What is a Microwave? *It’s electromagnetic waves with a short
wave length between radio waves and infrared radiation .
*The microwave radiation means electromagnetic radiation arising from radiation electric waves of high frequency value ranging between approximately (1 - 300) GHz.That is, they include a range of radiation wave length of (30 – 0.1) centimeter
*Radio waves are bounded it from below (larger wave-length) and is bordered by infrared that reduce the visible light spectrum of the highest (along with smaller) wave.
Microwave Applications
What is Link Budget ? *A link budget is accounting of all of the
gains and losses from the transmitter, through the medium to the receiver in a .telecommunication system
*It accounts for the attenuation of the transmitted signal due to propagation, as well as the antenna gains, feedline and
miscellaneous losses .
A simple link budget equation
Received Power (dB) = EIPR (dB) − Losses (dB)
Concept and parameters **EIPR :
EIRP: Effective Isotropic Radiated Power EIRP = Transmit power (fed to the antenna) + antenna gain
LTX = transmitter losses (coax, connectors...) (dB)
**Path Losses: The loss due to propagation between the transmitting and receiving antennas, often called the path loss or free space loss
[LOSSES[ =]FSL[ + ]RFL[ + ]AML[ + ]AA[ + ]PL ,]where :
_[FSL = ]free‐space spreading loss in dB =PT/PR(in w
atts)[ –RFL = ]receiver feeder loss in dB
[ –AML = ]antenna misalignment loss in dB[ –AA =]atmospheric absorption loss in dB
[ –PL = ]polarization mismatch loss in dB
where Lfs is expressed in dB, D is in Kilometers or Miles and fis in GHz.
General Equation *General equation for calculate received
power
References: 1 -https://en.wikipedia.org/wiki/Microwave
2 -https://en.wikipedia.org/wiki/Link_budget
3 ”-Link budget “ , PROF. MICHAEL TSAI, 2011
4 -https://en.wikipedia.org/wiki/Free-space_path_loss
5”-Link Budget Calculation”, The abdus Salam The International center of
theoretical physics
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