# RF Wireless World

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## RF Budget calculator

This page of converters and calculators section covers RF Budget calculator. This is used as RSSI calculator also. Here power at receiving antenna can be taken as RSSI.

RSSI refers to Received Signal Strength Indication. It measures the power in the received RF signal. This can be measured directly at the RF level or at baseband level using I/Q samples.

Frequency of operation in GHz (input1) :
Distance between Tx & Rx (meters) (input2) :
Transmitter Antenna Gain in dB (input3) :
Receiver Antenna Gain in dB (input4) :
Transmitter Power in dBW (input5) :

Free Space Path Loss in dB (Output1):

Power at receiving antenna in dBW (Output2):

EXAMPLE:
INPUTS:
Frequency(GHz) =4, Distance (meters) =35863E03, Transmitter gain(dB)= 48, Receiver Gain (DB)=44, Transmitter Power (dBW) = 24
OUTPUTS:
Free Space Path Loss(dB) = 195.57 , Power received (dBW) = -79.57

RF budget is the term most popular in satellite communication domain. As we know when the RF signal travels from one end to the other it gets attenuated and value of the attenuation depends upon the medium in which the EM wave is travelling. In the case of satellite communication, loss mainly occurs in the free space. The free space loss here depends upon the distance from the transmitter to the receiver and wavelength(or frequency) of operation.

Free space path loss = (4*π*d/λ)2

Following equation or formula is used for RF budget calculator.

This RF budget calculator calculates power received at satellite receiver and free space path loss. Transmitter power and antenna gains are provided as input to the RF budget calculator.  ### Useful converters and calculators

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