Broadband directional circularly polarized antenna applied in wireless communication system

Abstract

The invention discloses a broadband directional circularly polarized antenna applied in a wireless communication system. The broadband directional circularly polarized antenna comprises a dielectric substrate, a metal back cavity and a metal floor; upper and lower surfaces of the dielectric substrate have fan-shaped symmetrical dipole metallic patches; rotation parasitic metallic patches are distributed between the fan-shaped symmetrical dipole metallic patches; the fan-shaped symmetrical dipole metallic patches and the rotation parasitic metallic patches are symmetrically distributed around the center; the fan-shaped symmetrical dipole metallic patches and the rotation parasitic metallic patches rotate 90 degrees around the center in order; phase shifting rings of the connected fan-shapedsymmetrical dipole metallic patches on the upper and lower surfaces of the dielectric substrate are connected to an inner core and an outer sheath of a coaxial line; and the coaxial line passes through the floor and is connected with an SMA connector. The invention is simple in structure, is easy to process, and has wide axial ratio bandwidth and impedance bandwidth; a directional diagram is relatively stable in the common frequency band, so that the broadband directional circularly polarized antenna can be used for a wide-band wireless communication system and can reduce the antenna complexity of the communication system.

Description

technical field [0001] The invention relates to a broadband directional circularly polarized antenna used in a wireless communication system. The antenna works at 1.35GHz to 2.94GHz and can be used in the wireless communication system. Background technique [0002] As the front end of receiving and transmitting of the wireless communication system, the performance index of the antenna is directly related to the communication quality. Low profile, broadband development, and good gain and pattern characteristics are also important indicators of antenna performance. However, general circularly polarized antennas have narrow operating bandwidth and poor radiation pattern performance (especially in the high frequency part of the operating frequency band). Contents of the invention [0003] In order to solve the above problems, the object of the present invention is to provide a broadband directional circularly polarized antenna that can be applied in a wireless communication s...

AI Technical Summary

Problems solved by technology

However, general circularly polarized antennas have narrow operating bandwidth and poor radiation pattern performance (especially in the high frequency part of the operating frequency band)

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