Hi Yuzi Song,
Thank you for your post and question. First I would like to apologize for the weird formatting of the initial post. It seems something got broken, I'll try and fix this as quickly as possible (as soon as the forum allows me to edit the post...).
Regarding your questions:
- As mentioned in the intial post, the total power emitted by multiple dipole sources can be obtained using dipolepower(f) (or the box of monitors). In our example, sourcepower(f) gives 2fW, that is the sum of the power emitted by each dipole individually, while together, the actual power emitted is 1.39fW.
- I think it is important to remember sourcepower(f) corresponds to the power emitted by the source(s) in a homogeneous medium so where nothing perturbs the emission of each individual dipole, hence no interference between them. The interference will be taken into account by dipolepower(f).
I hope this anwsers your questions. Let us know if you need any further information.