A Single Helix Antenna with Improved Low Elevation Angle Characteristics

Abstract

The invention provides a single-screw antenna capable of improving a low elevation angle characteristic. The single-screw antenna comprises a screw (1), a dielectric support (2), a base plate (3), a short sleeve (4), double-screw bolts (5) and a connector (6). The connector (6) is located at the position of the center of the back of the base plate (3); an inner conductor of the connector (6) passes through the base plate (3) through a through hole to the front of the base plate (3) and is connected with the lower end of the screw (1); the screw (1) is supported by the dielectric support (2) and radiates polarized waves; the short sleeve (4) is positioned on the front of the base plate; eight double-screw bolts (5) are uniformly distributed outside the short sleeve (4); and the short sleeve (4) and the double-screw bolts (5) are of a combined action, so that the radiation directional diagram and the axial directional diagram of the antenna are broadened, and the low elevation angle characteristic of the antenna is improved.

Description

technical field [0001] The invention relates to an antenna circular polarization technology, in particular to a broadband single helical antenna with improved low elevation angle characteristics. Background technique [0002] As a circularly polarized directional antenna with small gain, the center-fed single helix antenna is applied to air-to-ground communication, and has the advantages of simple fabrication and low cost. The 3dB radiation beamwidth of this antenna is about 70°, and the axial ratio characteristics are often better within the 3dB radiation beamwidth, but the axial ratio characteristics deteriorate sharply outside the 3dB radiation beamwidth, resulting in poor low-elevation angle characteristics. The application of this antenna is limited. The axial ratio performance of the circularly polarized antenna can be improved by using the ring or the studs uniformly distributed along the circumference to load. For example, in the patent "A Ring-Loaded Microstrip Pa...

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Problems solved by technology

When loaded on some antennas, it can also broaden the radiation and axial ratio patterns at the same time, thereby improving low elevation performance, but often the frequency bandwidth is not wide

For example, in the master's thesis of South China University of Technology "Research on Beidou Wide Beam and Broadband Circularly Polarized Antenna", the cage structure of the ring and the stud is used as the parasitic unit, loaded on the four-wire helix, the maximum gain is 2.3dB, and the axial ratio of 3dB The beam width is widened from 100° to 156°, and the 3dB power beam width is widened from 150° to 180°, but the frequency bandwidth of the antenna is only 8%

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