-1

How to calculate aperture efficiency for an antenna with the following parameters:

  • Big reflector diameter= 24 mm
  • Gain= 9.265 dbi
  • Frequency= 11.60 GHz
Mike Waters
  • 7,948
  • 4
  • 18
  • 51
Kawa Abdoula
  • 19
  • 1

1 Answers1

1

For any antenna, also for wire antennas, you can calculate so called effective area with $A_{eff} = \frac{\lambda^2}{(4\pi)}G$. An ideal antenna with surface area of $A_{eff}$ absorbs the same amount of power from the plane wave as that antenna. Aperture efficiency is defined as ratio of effective and physical surface area $\eta_{ap} = A_{eff}/A_{phys}$. For a circular reflector antenna the physical size is the area of your antenna facing the incoming plane wave $ A_{phys} = \pi(d/2)^2$.

OH2FXN
  • 988
  • 5
  • 19
  • Hi,Thank you, but what about Aphys(how I can calculate Aphys if I have the big reflector Diameter =24mm) – Kawa Abdoula Oct 14 '19 at 08:42
  • I have edited my answer – OH2FXN Oct 14 '19 at 11:15
  • 4
    Are you sure about the input values? On a closer look it seems that your antenna diameter is barely a wavelength, not exactly a "big reflector" – OH2FXN Oct 14 '19 at 11:19
  • Antennas diameter is 26 mm,antennas height is 13.128 mm, gain is 9,265 dBi and frequency is 11.6 GHz. – Kawa Abdoula Oct 14 '19 at 12:04
  • @KawaAbdoula to repeat what the others have said: a reflector that's not even one wavelength is not a "big reflector". It doesn't actually work well as reflector, at all. – Marcus Müller Oct 14 '19 at 21:39