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Antenna Factor PDF

The document presents equations to convert between antenna factor and gain. It provides the equations to calculate antenna factor from gain and gain from antenna factor. It also includes an example calculation table showing antenna factors and gains across a range of frequencies. The purpose is to allow easy measurement of electric field strength by combining a spectrum analyzer with antennas and registering the antenna gain.

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160 views1 page

Antenna Factor PDF

The document presents equations to convert between antenna factor and gain. It provides the equations to calculate antenna factor from gain and gain from antenna factor. It also includes an example calculation table showing antenna factors and gains across a range of frequencies. The purpose is to allow easy measurement of electric field strength by combining a spectrum analyzer with antennas and registering the antenna gain.

Uploaded by

eceprince
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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The calculation equation useful for mutual conversion of an antenna factor and gain is presented.

Application

Connection block diagram

DUT

Biconical antenna
MAN150

Spectrum analyzer
MSA438

Solution

When measuring the electric field strength by combining a spectrum analyzer with an antenna, calculating 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 antenna factor Af (dB/m) from the antenna gain Ga (dBi) in a 50-ohm system.

2 2.4
Af = 20 log
(Ga/10)
10
But, wave length(m)
Similarly,the following equation is used to calculate the antenna gain Ga (dBi) from the antenna factor Af (dB/m) in a 50-ohm system.
2
2
Ga = 10 log 2.4
(Af/20)
10

But, wave length(m)

The following table is a calculation example.


Frequency [MHz] 30 50 100 200 500 1000 1500 2000 3000
Antenna factor [dB/m] 38.5 32.5 27.8 22.6 23.3 29.5 40.2 47.3 50.5
Antenna gain [dBi] -38.7 -28.3 -17.6 -6.4 0.9 0.7 -6.4 -11.1 -10.7

System configuration
A tool that can measure the electric field strength easily will be gotten at inexpensive cost.
Spectrum analyzer[MSA438] 1
Calibration of MSA438 1
Biconical antennaMAN150 1

2013/3

2987-2 Kobiki-cho, Hachioji-shi, Tokyo Japan


MICRONIX Corporation
URL http://www.micronix-jp.com
Tel: +81-42-637-3667 Fax:+ 81-42-637-0227 E-mail micronix_e@micronix-jp.com

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