Somehow my reply was not posted yesterday.
There are a few things:
1: negative power means the power flow is toward the negative axis.
2: the data you viewed is the raw power data without normalization.
3: Power is usually normalized to sourcepower transmission - Script command
4:For such bend waveguide, it is better to use FDE in MODE to get the loss contant:
Solving bent waveguides in FDE and FEEM
Bent waveguide analysis
5: you can also use the mode source to get the bending loss: choose "user select" and calculate the mode
Choose PML boundary conditions:
set the bending radius:
specify the wavelength or frequency, then "calculate modes":
For the half circule bending, we do not recommend to simulate it using FDTD. If you really want, please use mode expansion monitor, or better port to get the modal S paramter.
Please write a new post if you have other questions.
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