**3. Working Mechanism and Application Scenario**

In this section, the design evolution steps are first presented to understand the operating mechanism better. Consequently, the role of the DBs is analyzed. The third part shows the current vector distribution of the proposed antenna at 3.5 GHz and 4.9 GHz when DB1 is utilized or not, and some variables are selected to be analyzed. The last portion of this section provides a scenario where this device is held in dual-hand mode (DHM).
