A feeding network for improving a convergence of a lobe width of a wideband antenna, wherein the feeding network comprises a first power divider, a delay line, a 90° electric bridge and a second power divider, wherein the first power divider is configured to convert a signal input to the feeding network into two signals, such that the phase of one of the two signals is bechanged by the delay line and then input to the 90° electric bridge, and such that the other of the two signals is input to the 90° electric bridge directly, and wherein the 90° electric bridge is configured to convert the received two signals into two signals with same phase and different amplitudes, output one of them to a radiating unit (21, 23) via the second power divider and output the other signal to another radiating unit directly, wherein the delay line includes: a transmitting microstrip line body and a U-shaped portion formed by bending the transmitting microstrip line body, wherein a distance of a bottom end of the transmitting microstrip line body from a bottom end of the U-shaped portion is greater than a wavelength of the signal input to the feeding network, or a first main transmitting microstrip line and a short-circuit microstrip line connected in a T-shape, and a non-short-circuit end of the short-circuit microstrip line is connected to the first main transmitting microstrip line, and a short-circuit end of the short-circuit microstrip line is provided with grounding vias, and wherein a length of the short-circuit microstrip line is one quarter of the wavelength of the signal input to the feeding network, or a second main transmitting microstrip line and an open-circuit microstrip line connected in a T-shape, and wherein a non-open-circuit end of the open-circuit microstrip line is connected to the second main transmitting microstrip line, and wherein a length of the open-circuit microstrip line is one-half of the wavelength of the signal input to the feeding network. wherein the first power divider is configured to convert a signal input to the feeding network into two signals, such that the phase of one of the two signals is bechanged by the delay line and then input to the 90° electric bridge, and such that the other of the two signals is input to the 90° electric bridge directly, and wherein the 90° electric bridge is configured to convert the received two signals into two signals with same phase and different amplitudes, output one of them to a radiating unit (21, 23) via the second power divider and output the other signal to another radiating unit directly, wherein the delay line includes: a transmitting microstrip line body and a U-shaped portion formed by bending the transmitting microstrip line body, wherein a distance of a bottom end of the transmitting microstrip line body from a bottom end of the U-shaped portion is greater than a wavelength of the signal input to the feeding network, or a first main transmitting microstrip line and a short-circuit microstrip line connected in a T-shape, and a non-short-circuit end of the short-circuit microstrip line is connected to the first main transmitting microstrip line, and a short-circuit end of the short-circuit microstrip line is provided with grounding vias, and wherein a length of the short-circuit microstrip line is one quarter of the wavelength of the signal input to the feeding network, or a second main transmitting microstrip line and an open-circuit microstrip line connected in a T-shape, and wherein a non-open-circuit end of the open-circuit microstrip line is connected to the second main transmitting microstrip line, and wherein a length of the open-circuit microstrip line is one-half of the wavelength of the signal input to the feeding network. a transmitting microstrip line body and a U-shaped portion formed by bending the transmitting microstrip line body, wherein a distance of a bottom end of the transmitting microstrip line body from a bottom end of the U-shaped portion is greater than a wavelength of the signal input to the feeding network, or a first main transmitting microstrip line and a short-circuit microstrip line connected in a T-shape, and a non-short-circuit end of the short-circuit microstrip line is connected to the first main transmitting microstrip line, and a short-circuit end of the short-circuit microstrip line is provided with grounding vias, and wherein a length of the short-circuit microstrip line is one quarter of the wavelength of the signal input to the feeding network, or a second main transmitting microstrip line and an open-circuit microstrip line connected in a T-shape, and wherein a non-open-circuit end of the open-circuit microstrip line is connected to the second main transmitting microstrip line, and wherein a length of the open-circuit microstrip line is one-half of the wavelength of the signal input to the feeding network.