Abstract: An antenna assembly comprising an antenna. The antenna includes: a substrate including a first surface and a second surface arranged opposite to each other; a first radiator disposed at the first surface and including two first radiation elements spaced apart from each other and connected to each other by a connector; and a second radiator disposed at the second surface and including a second radiation element disposed at an area of the second surface corresponding to an area of the first surface between the two first radiation elements. Each of the two first radiation elements and the second radiation element includes a current adjustment structure configured to adjust a current flow direction in the radiation element to which the current adjustment structure belongs.

Abstract: The present application discloses methods, devices, servers, and systems for notification between mobile terminals during communication. When two mobile terminals are in an active communication session, sometimes one terminal fails to respond to the other terminal due to various reasons such as distractions, additional responsibilities, or technical difficulties. The mobile terminal that is not getting a response may then utilize the process herein disclosed to notify the other terminal that a response is expected. By shaking or other convenient approaches, a mobile terminal may send out a notification request during an active communication session. The other terminal may return a notification response indicating whether the other terminal is in a current communication with a third mobile terminal or is in an idle status.