Abstract: An electrostatic discharge (ESD) circuit includes a first ESD detection circuit, a first discharging circuit and a first ESD assist circuit. The first ESD detection circuit is coupled between a first node having a first voltage and a second node having a second voltage. The first discharging circuit includes a first transistor. The first transistor has a first gate, a first drain, a first source and a first body terminal. The first gate is coupled to the first ESD detection circuit by a third node. The first drain is coupled to the first node. The first source and the first body terminal are coupled together at the second node. The first ESD assist circuit is coupled between the second and third node, and configured to clamp a third voltage of the third node at the second voltage during an ESD event at the first or second node.

Abstract: An antenna resonator unit is provided. The antenna resonator unit is adapted to be selectively connected to a first radiator or a second radiator, which includes a substrate and a resonator. The shape of the resonator is formed on the substrate, wherein the shape of the resonator is U-shaped, and includes a first end portion and a second end portion, wherein a ground point is formed on the first end portion, a radiator connection point is formed on the second end portion, and a feed point is disposed on the second end portion, wherein the radiator connection point is selectively connected to the first radiator or the second radiator.