The invention discloses a wide-beam antenna of a maritime
satellite communication terminal. The wide-beam antenna comprises an upper parasitic patch, a lower circuit, a
microwave substrate, a feed interface, conductive walls, a reflecting sheet and medium studs. The lower surface of the
microwave substrate is connected with the reflecting sheet while the upper surface of the same is provided with the lower circuit, and the medium studs penetrate the
microwave substrate to be fixed on the reflecting sheet. The upper parasitic patch is set up above the lower circuit through the medium studs, an inner conductor of the feed interface is connected with the lower circuit while an outer conductor of the same is connected with the reflecting sheet, and the conductive walls are arranged on the periphery of the
microwave substrate on the reflecting sheet. The lower circuit is composed of a lower parasitic patch,
impedance matching branches, a phaser and a power divider, wherein the
impedance matching branches are connected between the lower parasitic patch and the power divider as well as between the lower parasitic patch and the phaser. Based on a wide-beam antenna of a stacked structure, the circularly polarized maritime
satellite antenna having the advantages of low profile,
wide beam and
broadband is designed by introduction of the vertical conductive walls, and is simple in structure, easy to produce and low in cost.