Abstract: An antenna system includes a first antenna, a second antenna, and a tuning stub, where the first antenna and the second antenna have a same first operating frequency band or similar first operating frequency bands. The tuning stub is electrically connected to the first antenna, and the tuning stub is configured to adjust an equivalent current path of the first antenna, so that a connection line between a projection point of a maximum equivalent current point of the first antenna and a projection point of a maximum equivalent current point of the second antenna on a first plane tends to be more perpendicular to a projection of the equivalent current path of the first antenna or of the second antenna on the first plane; or the equivalent current path of the first antenna and of the second antenna tend to be more perpendicular to each other.

Abstract: An antenna apparatus includes a ground plate, a radiator, and a signal source. The radiator is disposed on the ground plate. The signal source is configured to feed an electromagnetic wave signal of a first frequency band into the radiator. A first slot and a second slot are disposed on the ground plate. Both slots are closed slots and surround the radiator, and are used to restrain current distribution on the ground plate.

Abstract: An antenna apparatus includes a ground plate, a radiator, and a signal source. The radiator is disposed on the ground plate. The signal source is configured to feed an electromagnetic wave signal of a first frequency band into the radiator. A first slot and a second slot are disposed on the ground plate. Both slots are closed slots and surround the radiator, and are used to restrain current distribution on the ground plate.

Abstract: The present disclosure provides an antenna. The antenna includes a PCB board, a matching circuit, and a feeder. The PCB board is provided with a ground plane. The ground plane is provided with an open slot. One end of the matching circuit is connected to a signal source, and the other end of the matching circuit is connected to an end of the feeder. The feeder passes across the open slot. An endpoint of the feeder is connected to one side of the open slot. The antenna further includes a capacitor C1 and an inductor L1. The capacitor C1 and the inductor L1 are located in the open slot. The capacitor C1 and the inductor L1 are connected in series. The antenna may further generate a low frequency based on an original frequency band.