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I am currently working on a system to communicate with amateur CubeSats. I have decided to use the turnstile crossed-dipole style yagi because it is relatively easy to construct and uses circular polarization. However, I cannot find resources on how to calculate the gain for such an antenna. Turnstile Yagi Antenna

I suspect the gain would be equivalent to that of a typical yagi with the same characteristics. Is this correct?

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  • $\begingroup$ Welcome to ham.stackexchange.com! $\endgroup$
    – rclocher3
    Commented Oct 21, 2019 at 14:21
  • $\begingroup$ Welcome to SE! You can simulate it with xnec2c and optimize its gain and impedance match with xnec2c-optimize. $\endgroup$
    – KJ7LNW
    Commented May 27 at 16:30
  • $\begingroup$ Can you share a link to the original source containing the image referenced on your post? $\endgroup$
    – KJ7LNW
    Commented May 27 at 16:54

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The answer to calculating the gain of any antenna is usually to model it. EZNEC is a common solution.

Absent modelling, you are correct that a circularly polarized Yagi will have gain approximately equal to an similar linearly polarized one.

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  • $\begingroup$ Note for others who might find this: I believe that using a circularly-polarized (CP) antenna to contact a vertical or horizontal antenna (or vice-versa) will have a -3dB "loss". CP to CP in the same handedness will get the full CP gain, as would a horiz-to-horiz or vert-to-vert antenna. Of course for working satellites you definitely want a CP antenna! $\endgroup$
    – KJ7LNW
    Commented May 27 at 16:28

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