You Do Need power plug adapter while traveling from Portugal to United Arab Emirates (UAE).

Here is Why You Need An Adapter

The outlet and plug type used in United Arab Emirates (UAE) is G and in Portugal are C and F. This is how they look like.

Portugal

In Portugal, outlets of type C and F are in use.

Type C

Type F

United Arab Emirates (UAE)

In United Arab Emirates (UAE), outlets of type G are in use.

Type G