Radiation Pattern Level (Circular Aperture Antenna)

Last modified by

MichaelBartmess

on

Jul 24, 2020, 6:28:07 PM

Created by

MichaelBartmess

on

May 6, 2015, 3:31:15 AM

$dB_"from peak main beam" = 10*log_"10"(|2* (J_1( "X" ))/ "X" |^2)$

$"Angle from Peak"$

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59f9ce3f-f3a0-11e4-a3bb-bc764e2038f2

This vCalc antenna equation computes the radiation directivity of a circular antenna at various angles from the peak of the main beam. /attachments/59f9ce3f-f3a0-11e4-a3bb-bc764e2038f2/552px-Typical_Antenna_Pattern.jpg This equation assumes the antenna has a uniform amplitude distribution and is calculated from the zero-order Bessel Function of the first kind ( $J_1(X)$ ).

The units dBi is the decibels relative to an isotropic antenna.

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The peak of the first lobe of a circular antenna calculated here is at $X approx 5.14$ and it's directed power is approximately -17.57 dB.

Radiation Pattern Level (Circular Aperture Antenna)

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