The elements library in FDTD Solutions and MODE solutions allows the users to create a rounded tip cone using the “custom” object. However, if someone is trying to import this structure into DEVICE (CHARGE or HEAT), they can not do it since DEVICE do not support the custom object.
One easy solution to this problem is to use the planar solid object which is available in DEVICE (and also in the optical solvers). The planar solid object can be used to create any arbitrary geometry. In this file (rounded_tip_cone.ldev (5.0 MB)) a structure group has been created that generates a planar solid to create a rounded tip cone. The input parameters to the structure group have been kept almost identical to the FDTD (custom) counterpart.
Here is one more post that shows how a truncated cone can be created using planar solid,