Calculation of antenna factor and gain
The calculation equation useful for mutual conversion of an antenna factor and gain is presented.
Connection block diagram
- When measuring the electric field strength by com bining a spectrum analyzer with an antenna, calcul ating an antenna gain from an antenna factor, or the contrary may be needed. The calculation equation is shown below. In MSA438 , the electric field strength can be read directly by registering the antenna gain in it.
- The following equation is used to calculate the ant enna factor Af (dB/m) from the antenna gain Ga (dBi) in a 50-ohm system.
- Similarly, the following equation is used to calcula te the antenna gain Ga (dBi) from the antenna facto r Af (dB/m) in a 50-ohm system.
- The following table is a calculation example.
|Antenna factor [dB/m]||38.5||32.5||27.8||22.6||23.3||29.5||40.2||47.3||50.5|
|Antenna factor [dB/m]||-38.7||-28.3||-17.6||-6.4||0.9||0.7||-6.4||-11.1||-10.7|
|Spectrum Analyzer MSA438|
|MSA438 calibration set|
*MICRONIX Corporation reserves the right to make changes in design, specification and other information without prior notice.