A single helical antenna with wide angle coverage

Abstract

The invention provides a single helical antenna with wide angle coverage, comprising a helix (1), a dielectric pillar (2), a bottom plate (3), a low sleeve (4), a stud (5), a connector (6) and a hollowed-out reflector (7). The connector (6) is located in a central position on the back of the base plate (3), the inner conductor of the connector passes through the through hole through the front sideof the bottom plate, and is connected to the lower end of the screw (1), A spiral (1) is supported by a dielectric strut (2) and radiates a circularly polarized wave, A low sleeve (4) is position onthat front side of the base plate, eight studs (5) are uniformly distribute outside the low sleeve (4), and a hollow reflector (7) is positioned above the helix (1), thereby widening the radiation pattern of the antenna, effectively improving the low elevation angle characteristic of the antenna in airborne application, and achieving good antenna performance consistency within a frequency bandwidth of 20%.

Description

technical field [0001] The invention relates to an antenna circular polarization technology, in particular to a single helix antenna with wide-angle coverage. Background technique [0002] The center-fed single helix antenna is used as a small-gain airborne circularly polarized directional antenna and is applied to air-ground communication, and has the advantages of simple fabrication and low cost. The 3dB radiation beamwidth of the antenna is about 70°, and the gain is often good within the 3dB radiation beamwidth, but the gain deteriorates sharply outside the 3dB radiation beamwidth, resulting in poor low-elevation gain in airborne applications. The ground limits the application of this antenna. The inventor adopts a metal short sleeve and a set of coupling studs in "A Single Helix Antenna with Improved Low Elevation Angle Characteristics" (Patent No. 20171036.7), which broadens the radiation and axial ratio patterns of the single helix antenna, and improves the The circ...

AI Technical Summary

Problems solved by technology

The 3dB radiation beamwidth of the antenna is about 70°, and the gain is often better within the 3dB radiation beamwidth, but the gain deteriorates sharply outside the 3dB radiation beamwidth, resulting in poor low-elevation gain in airborne applications, so it is extremely Earth limits the application of this antenna

In "A Single Helix Antenna with Improved Low Elevation Angle Characteristics" (Patent No. 20171036.7), the inventor adopted a metal short sleeve and a set of coupling studs to widen the radiation and axial ratio pattern of the single helix antenna, and improved the The antenna has circular polarization characteristics at low elevation angles, but in airborne applications, it is still possible that the antenna gain in the communication direction at low elevation angles may drop too quickly due to aircraft maneuvering, so it is necessary to further increase the gain of the antenna at low elevation angles, thereby broadening the coverage of the antenna angle

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