Antenna system

An antenna system, comprising:

• a ground plane, comprising a first side and a second side;
• a first antenna unit, connected to the first side, wherein the first antenna unit is configured to receive and transmit a first high-frequency signal and a first low-frequency signal;
• a second antenna unit, connected to the second side, wherein the second antenna unit is configured to receive and transmit a second high-frequency signal and a second low-frequency signal;
• a first ground unit, wherein a closed end of the first ground unit is connected to the first side, and another closed end of the first ground unit is connected to the second side, to jointly form a closed loop of the first ground unit with the ground plane, and a physical length of the first ground unit matches the first high-frequency signal and the second high-frequency signal to provide grounding of the first high-frequency signal and the second high-frequency signal;
• and
• a second ground unit, forming a closed loop of the second ground unit, wherein the second ground unit is connected to the first ground unit, and a physical length of the second ground unit is less than the physical length of the first ground unit, wherein
• a sum of the physical length of the second ground unit and the physical length of the first ground unit matches the first low-frequency signal and the second low-frequency signal, and the second ground unit and the first ground unit jointly provide the grounding of the first low-frequency signal and the second low-frequency signal.