8-shaped like planar broadband circularly polarized antenna

Abstract

The invention provides an 8-shaped like planar broadband circularly polarized antenna. The planar broadband circularly polarized antenna comprises a dielectric substrate, a top-layer radiation unit and a bottom-layer radiation unit, wherein the top-layer radiation unit is arranged on an upper surface of the dielectric substrate; the bottom-layer radiation unit is arranged on a lower surface of the dielectric substrate; the top-layer radiation unit and the bottom-layer radiation unit are the same in sizes and structures; the top-layer radiation unit consists of a top-layer metal strip radiation unit and a top-layer metal half-wave dipole unit which are connected with each other; the bottom-layer radiation unit consists of a bottom-layer metal strip radiation unit and a bottom-layer metal half-wave dipole unit which are connected with each other; and the top-layer radiation unit and the bottom-layer radiation unit are arranged in an inversesymmetry way like the number 8 relative to the dielectric substrate. The structure is suitable for the broadband circularly polarized antenna. Through adoption of the 8-shaped like planar broadband circularly polarized antenna, the antenna structure is symmetric and simple; convenientfeed is achieved; and broadband wide-beam circularly polarized radiation can be realized. Moreover, the antenna is small in size, and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the field of microwave technology, and in particular relates to a figure-eight-like planar broadband circularly polarized antenna. Background technique [0002] Microstrip antennas have the characteristics of small size, light weight, and low cost, and are widely used in the field of wireless communication. Circularly polarized antennas have many advantages: they can receive linearly polarized incoming waves in various directions, and their circularly polarized radiation waves can also be received by any polarized antenna; they have rotation orthogonality, and polarized waves are incident on symmetrical targets and reflected The wave becomes anti-handed and so on. However, since the impedance bandwidth and axial ratio bandwidth of circularly polarized microstrip antennas are usually narrow, and the beam width is narrow, in order to meet the needs of wireless data transmission for broadband antennas, various new antenna designs...

AI Technical Summary

Problems solved by technology

However, since the impedance bandwidth and axial ratio bandwidth of circularly polarized microstrip antennas are usually narrow, and the beam width is narrow, in order to meet the needs of wireless data transmission for broadband antennas, various new antenna designs and structures have begun to appear.

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