Hello Thanks for your reply.
I appreciate it...and read the book relative to antenna array and have the initial result. However, now I met another problem.
The problem is that I used Momentum and HFSS to simulate the T-junction power divider possessing two different phase outputs for antenna scanning application.
Even they have the identical structure parameters; however, their deg (S21-S31) are different obtained by two respective softwares.
For example, I want to generate a divider to have phase different of 171 degree and obtained the results by Momentum; but when I put it on HFSS to simulate again, the phase different become 200 degree.
The magnitudes of S21 and S31 are also changed and generally moved to lower frequency (almost 15% frequency shift).
I know it may be caused by different EM machnisms such that analytical and iterative solver.
Theoretically Momentum should be more accurate on the planar structure; however, I used HFSS for antenna simulation. If HFSS got the wrong phase difference, which may degrade the performance of radiation pattern.
Could someone meet the same problem before? Please give me some comments.