An antenna and an electronic device are provided in the disclosure. The antenna includes a first radiator, a matching circuit, a first adjustment circuit, a
signal source, and a second radiator. The first radiator has a first ground end, a first free end, and a
feed point. The first adjustment circuit is electrically connected to the matching circuit. The first adjustment circuit includes a switch unit and multiple adjustment sub-circuits, and the switch unit electrically connects at least one adjustment sub-circuit to the matching circuit. The
signal source electrically connects the matching circuit to the
feed point. A gap is defined between the second radiator and the first radiator, the second radiator is coupled to the first radiator via the gap. The second radiator has a second ground end and a second free end, the second free end is closer to the gap than the second ground end, and the antenna has at least two resonant
modes. Transmission / reception of electromagnetic wave signals in a middle band (MB) and a high-band (HB) is supported by the at least two resonant
modes cooperatively at the same moment, or transmission / reception of electromagnetic wave signals in an MB of long-term evolution (LTE) and an MB of new radio (NR) is supported by the at least two resonant
modes cooperatively at the same moment, or transmission / reception of electromagnetic wave signals in an HB of LTE and an HB of NR is supported by the at least two resonant modes cooperatively at the same moment.