An antenna, wherein the antenna is configured to radiate a first signal and a second signal, the first signal and the second signal are in different frequency bands, a first half-wavelength is half of a wavelength corresponding to the first signal, a second half-wavelength is half of a wavelength corresponding to the second signal, and the antenna comprises a medium substrate, a top radiating element, a phase inversion unit, and a bottom radiating element; the medium substrate is used as a carrier of the top radiating element, the phase inversion unit, and the bottom radiating element; wherein the phase inversion unit comprises at least a first and a second current phase inversion points (405, 406, 507, 509, 510), a part of the phase inversion unit between the at least first and second current phase inversion point (405, 406) does not produce radiation, and the top radiating element and the bottom radiating element horizontally radiate the first signal and the second signal omnidirectionally; wherein the phase inversion unit comprises a meander line part and a vertical part, the vertical part comprises a first slot and a second slot, the first slot is parallel to the second slot, and the first slot and the second slot divide the vertical part into a first microstrip, a second microstrip, and a third microstrip; the first microstrip and the third microstrip are respectively located on two sides of the second microstrip; and when the antenna is configured to radiate the second signal, currents at the first microstrip and the second microstrip are in opposite directions, and currents at the second microstrip and the third microstrip are in opposite directions, so that the second microstrip does not produce radiation; wherein a first end of the top radiating element is connected to an end of the phase inversion unit; a second end of the phase inversion unit, which coincides with an end of the second microstrip, is connected to an end of the bottom radiating element; a length of the phase inversion unit, which is the distance between the first end and the second end, is a first odd multiple of the second half-wavelength; and the length of the phase inversion unit, is greater than a second odd multiple of the first half-wavelength; - the first signal is a Band41 signal and the second signal signal a Band42 signal; - the first half-wavelength corresponds to half of a wavelength λ 1 corresponding to a center frequency ofBand41; - the second half-wavelength corresponds to half of a wavelength λ 2 corresponding to a center frequency of Band42; - the first odd multiple of the second half-wavelength is 3λ 2 /2; and - the second odd multiple of the first half-wavelength is λ 1 /2; the medium substrate is used as a carrier of the top radiating element, the phase inversion unit, and the bottom radiating element; wherein the phase inversion unit comprises at least a first and a second current phase inversion points (405, 406, 507, 509, 510), a part of the phase inversion unit between the at least first and second current phase inversion point (405, 406) does not produce radiation, and the top radiating element and the bottom radiating element horizontally radiate the first signal and the second signal omnidirectionally; wherein the phase inversion unit comprises a meander line part and a vertical part, the vertical part comprises a first slot and a second slot, the first slot is parallel to the second slot, and the first slot and the second slot divide the vertical part into a first microstrip, a second microstrip, and a third microstrip; the first microstrip and the third microstrip are respectively located on two sides of the second microstrip; and when the antenna is configured to radiate the second signal, currents at the first microstrip and the second microstrip are in opposite directions, and currents at the second microstrip and the third microstrip are in opposite directions, so that the second microstrip does not produce radiation; wherein a first end of the top radiating element is connected to an end of the phase inversion unit; a second end of the phase inversion unit, which coincides with an end of the second microstrip, is connected to an end of the bottom radiating element; a length of the phase inversion unit, which is the distance between the first end and the second end, is a first odd multiple of the second half-wavelength; and the length of the phase inversion unit, is greater than a second odd multiple of the first half-wavelength; - the first signal is a Band41 signal and the second signal signal a Band42 signal; - the first half-wavelength corresponds to half of a wavelength λ 1 corresponding to a center frequency ofBand41; - the second half-wavelength corresponds to half of a wavelength λ 2 corresponding to a center frequency of Band42; - the first odd multiple of the second half-wavelength is 3λ 2 /2; and - the second odd multiple of the first half-wavelength is λ 1 /2; - the first signal is a Band41 signal and the second signal signal a Band42 signal; - the first half-wavelength corresponds to half of a wavelength λ 1 corresponding to a center frequency ofBand41; - the second half-wavelength corresponds to half of a wavelength λ 2 corresponding to a center frequency of Band42; - the first odd multiple of the second half-wavelength is 3λ 2 /2; and - the second odd multiple of the first half-wavelength is λ 1 /2;