Satellite Communications/transmitting two different polarized signal
How can Earth station transmit two polarized signal(one transponder up/Dw=H/V and 2nd transponder up/dw=V/H) in satellite from one uplink antenna? Does it required to used two HPA for two different polarized transponder? Does it required to setup two waveguide for vertical and horizontal feed in uplink antenna?
Sorry for the delay in my answer.
Indeed, you will need an HPA per polarization.
Typically, the antenna will have a 4-port feed.
With 2 ports for the reception of the 2 polarizations and another 2 ports for the 2 transmit signals.
A practical example of a 4-port Ku-band feed can be seen on http://www.gdsatcom.com/rfproducts/Ku-Band/112653-4%20TDS.pdf
I hope this helps,