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Basically, you want to apply two tones into the RF input, spaced 1-5MHz apart. Call these F1 and F2. Then depending on what your LO is, you measure measure the output power levels of the F2 +/- Flo product (P1) and the 2*F2 - F1 +/- Flo product (P3 third order distortion power). The +/- is if...
I haven't used CST... pictures of plots would be better. It could be that your port excitations are inconsistent between your CST and HFSS setups. In HFSS, you have to setup your integration paths on the ports to be the same direction. Otherwise when doing arrays, you may get some ports...
From here, Rician Fading, the channel response to a sinusoid input is h(t) = C*Dirac(t - t0) + sum(rho_n * Dirac(t - tn)). For a Rician channel, C is non-zero and larger than the rho_n components. This is your direct LOS path with time delay t0. The autocorrelation of h(t) is your Ac(t,del_t)...
Not sure without knowing more. Can you instead determine Zin for your stub, then solve for the phase length needed to give you that Zin with a 65ohm-width line? It shouldn't change the length too much.
If you're only concerned about determining antenna efficiency, resistive and dielectric losses are fairly constant over a "narrow" bandwidth. You could determine S11 at the antenna input port at one frequency and use that to determine the efficiency per WimRFP's equations.
If you have a...
Basically, yes. Metal or dielectrics in the vicinity can cause loss and you can lump that in with the radiation efficiency. Through reciprocity, it's the same for transmit or receive. Power accepted is 1-|S11|^2, which in an array would be active-S11 to account for mutual coupling terms.
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