Omnidirectional dual circularly polarized antenna

Abstract

The invention provides an omnidirectional dual circularly polarized antenna which is an integrally coaxial structure; a medium is filled between inner and outer conductors which are coaxially arranged; rectangular gaps (with an included angle of 90 degrees) which are perpendicular with one another are formed in the conductor wall of the outer conductor of an antenna radiation structure; the upper and the lower gaps which are perpendicular with one another are divided into a group to form a gap pair; four groups of gaps are formed in the periphery of the conductor wall to form a radiation unit; the four groups of the radiation units are arranged up and down to form a radiation array which is an antenna radiation section. Upper and lower ends of the antenna radiation structure are respectively used as dual circularly polarized two feeder ports; a coaxial tapered transmission line structure is adopted for changing the interface into a practical SMA interface dimension for performing radio frequency feeder. According to the embodiment disclosed by the invention, the omnidirectional performances and the dual circularly polarized performances are good, the working frequency band is 5.1-5.9GHZ, -15dB isolation bandwidth is 12.8%, a reflection coefficient in the isolation bandwidth is smaller than (-)10dB, omnidirectional surface gain within the band is 3dBic-dBic, and the omnidirectional average axial ratio is smaller than 3dB.

Description

technical field [0001] The present invention relates to an antenna in the field of communication technology, in particular to an omnidirectional dual circular polarization antenna for realizing omnidirectional dual circular polarization. Background technique [0002] With the development of modern communication technology, pure linear polarization is difficult to meet the communication requirements. Circularly polarized antennas can receive incoming waves of any polarization, and their radiated waves can also be received by antennas of any polarization. It has the advantages of rotation orthogonality, ability to suppress cloud and rain interference, and anti-multipath reflection. Due to the superior performance of circularly polarized antennas in modern communications, more and more people pay attention to them. Omnidirectional circular polarization realizes the omnidirectional radiation characteristics of the antenna under the condition of ensuring circular polarization, a...

AI Technical Summary

Problems solved by technology

However, these are only single circular polarization implementations, and there are very few antenna forms that realize omnidirectional dual circular polarization.

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