# Is OSIRIS-REx's high gain antenna nearly the same as TESS'? If so, why?

These two high gain antennas look very similar superficially, but are not identical. Is this a case of convergent design (a fancy kind of coincidence) or have they evolved from the same source, or were they designed by the same group? Is OSIRIS-REx's high gain antenna nearly the same as TESS'? If so, why?

"Bonus points" for figuring out what ORIRIS-REx's dish is made of. Is this just structural and a metal reflector will be applied later?

(related but different, and no accepted answer yet: Why is TESS' high gain antenna made of undulating BLACK fabric rather than metal?)

OSIRIS-REx's high gain antenna from Spaceflight 101's OSIRIS-REx Instruments:

TESS's high gain antenna from Spaceflight 101's Photos: TESS Spacecraft Assembly & Testing :