Wide-beam antenna of maritime satellite communication terminal

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a low-profile, wide-beam, wide-band, and circularly polarized microstrip antenna for maritime satellite communication applications. Background technique [0002] In the application of maritime satellite communication, the ground mobile communication terminal antenna is usually required to have the characteristics of wide beam, wide frequency band and circular polarization to meet the communication requirements. At present, the axial mode helical antenna is widely used in maritime satellite communication. This antenna has the characteristics of high gain and wide frequency bandwidth, but its beam width is narrow, and the half-power beam width is usually about 80 degrees. In order to compensate for the low elevation angle gain, it is usually designed as The active antenna greatly increases the product cost. The quadrifilar helical antenna is a wide-beam antenna. Its half-power beam...

AI Technical Summary

Problems solved by technology

At present, the axial mode helical antenna is widely used in maritime satellite communication. This antenna has the characteristics of high gain and wide frequency bandwidth, but its beam width is narrow, and the half-power beam width is usually about 80 degrees. In order to compensate for the low elevation angle gain, it is usually designed as Active antenna, greatly improving product cost

The quadrifilar helical antenna is a wide-beam antenna. Its half-power beam width can usually reach 150 degrees, but the quadrifilar helical antenna is relatively high. In order to achieve a wider frequency band, the height exceeds 0.8λ (λ is the working wavelength of the antenna). It does not meet the height-restricted use environment, and the structure of this antenna is complex and not easy to produce

Images