Broadband circularly polarized antenna covered by semi-sphere-like beam in Ka frequency band

Abstract

The invention relates to a broadband circularly polarized antenna covered by a Ka-frequency-band hemisphere-like wave beam, and belongs to the field of electronic science and technology subjects. Comprising a metal ring, a dielectric plate, a metal curved body, a circular waveguide and a metal bottom plate, an upper opening of the metal curved body covers the dielectric plate, and a lower opening is covered by the metal bottom plate; the circular waveguide is arranged in the metal curved-surface body, the upper opening is connected with the top opening of the metal curved-surface body, and the lower opening is connected with the metal bottom plate; the designed metal ring and metal curved surface body combined structure effectively widens the beam width, and keeps the axial symmetry (similar to a hemisphere) of a directional diagram. The circular waveguide stepped partition plate circular polarizer is used for feeding, the structure is simple, and loss is small.

Description

technical field [0001] The invention belongs to the subject field of electronic science and technology. In particular, a realization scheme of a millimeter-wave Ka-band circularly polarized antenna is provided. The antenna has a wide frequency band, a pattern with good axial symmetry, and a wide beam that resembles hemispherical coverage. It can be applied to the communication system of the moving carrier. Background technique [0002] On a mobile carrier, in order to maintain stable communication quality under different attitudes, the antenna needs to have a fairly wide beam width in order to achieve wide-angle gain coverage and ensure wide-angle information transmission and reception. For example, in radio systems such as communication and navigation on mobile carriers such as vehicles, ships, aircraft and satellites, antennas are required to have broadband and ultra-wide beam (approximate half-space coverage) characteristics. At present, most of these antennas are linea...

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Problems solved by technology

[0004] The existing broadband circularly polarized wide-beam antennas are usually implemented in the form of conical helix, magnetoelectric dipole, microstrip antenna and crossed dipole; magnetoelectric dipole has a wide impedance bandwidth, but its electrical Dipoles and magnetic dipoles are asymmetric structures, which lead to large fluctuations in the symmetry of their patterns as the

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