US Patent 10403066 Portable device having directional BLE antenna

A system and method for a portable device analyzing user information broadcast from target user devices is disclosed. The portable device includes a commodity user device (e.g. iPhone, smart phone) and a directional antenna system fastened to the commodity user device for receiving the user information broadcast from the target user devices. An application program executing on the portable device can then be used to disable a user account on an access control system, for example.