NEC-LIST: Use of CP for multiple dipoles antennas

Hello,
I am currently studying a solution under NEC2 permitting the mesurement of
the decoupling between 2 antennas: a Yagi and a GSM type. I have indeed
tried everything using the CP function. But the difficulty comes from the
fact that the GSM antenna is made of several radiating elements.
Now the CP function permits the measurement of the decoupling only between
two unique segments. The solution that I envision at the moment is to
distribute a unique supply (on one of the dipoles) for all of the GSM
antenna. So I can use the one unique CP function between the radiating
segment of the GSM antenna and the radiating segment of the Yagi.
Only, the obtained results do not return a correct outcome in the case.
Indeed, according to the place of excitement on which dipole on the GSM
antenna, the decoupling value is variable. I hope to have formulated my
problem in a rather clear manner and that you will be able to reply with
some elements of explanation.
In this case, I sincerely thank you.
Cordially, Etienne LEROUX-GIRARD.

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