Hello, I need to know the effective area (Aeff) of the HyperLog 60100 antenna. I searched for the equation of this parameter for this particular antenna and I found the typical equation which is for aperture antennas:

Aeff=G*(lambda)^2/(4*pi)

But the log-periodic antenna isn't an aperture antenna, this is a thin elements antenna because it's a dipole array. I found that the thin elements atenna haven't a simple relationship between physical area and effective area:

https://en.wikipedia.org/wiki/Antenna_a ... cite_ref-6

I read the book "Modern Antenna Design" and I found the same, the typical equation is for aperture antenna.

So, do you know what's the effective area equation for a log-periodic antenna?

Or, can you guide me to find the equation?

These days, I have been reading books related to antennas and I found in the book **"Antennas" by Kraus** that the equation, which I mentioned before, **can be used for any antenna** (page 54, at the beggining):

G=4*pi*Aeff/(lambda)^2

I got confused with the scope of the mentioned equation because I read in the book "Modern Antenna Design" by Milligan that that equation was derived for large aperture antennas. Maybe, I didn't interpret that correctly.

So fortunately, I was able to calculate the effective area of my antenna from the mentioned equation and the antenna gain with respect to an isotropic antenna.