Hi, How can I calculate aperture efficiency for reflectarray antennas by using CST software, Thanks.?

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Hend A. Malhat

The aperture efficiency of the reflectarray antenna is the ratio of the effective aperture to the physical aperture. The formula usually looks like:

ϵap=Ae/Ap

The aperture efficiency is a dimensionless number usually reported as a percentage and Ap is the physical aperture and Ae is the effective aperture (which is related to the antenna gain and operating wavelength)

Ae=G*lamda*lamda/(4*pi)

the calculated gain using cst at specific wavelength

Muhammad Hussain

Gain (linear scale), Wavelength (meter), A_phy(square meter), Eap=Ae/A_phy example is given in figure