Satellite communication dual-frequency circularly polarized antenna

Abstract

The invention discloses a satellite communication dual-frequency circularly polarized antenna, which comprises an inner dielectric support, an inner radiator, an outer dielectric support, an outer radiator, a feeding layer and a grounding layer, wherein the inner dielectric support is of a cylinder structure, and two coaxial cables are arranged in the middle of the inner dielectric support; the inner radiator is of a four-arm spiral structure, and four spiral wires of the inner radiator are evenly wound around the outer surface of the inner dielectric support; the outer dielectric support is of a cylindrical ring structure, the outer dielectric support sleeves the inner dielectric support, and the outer diameter of the outer dielectric support is greater than the outer diameter of the inner dielectric support; and the outer radiator is of a four-arm spiral structure, and four spiral wires of the outer radiator are evenly wound around the outer surface of the outer dielectric support. The satellite communication dual-frequency circularly polarized antenna has the advantages of simple structure, small size, wide antenna bandwidth, high gain, high gain consistency of the two frequencybands, good overall performance and capability of meeting the requirement of miniaturization.

Description

technical field [0001] The invention relates to a satellite communication circular polarization antenna, in particular to a satellite communication dual-frequency circular polarization antenna. Background technique [0002] In 1968, C.C. Kilgus proposed a resonant four-arm helical structure antenna, which consists of four helical arms, and the length of each helical arm is an integer multiple of a quarter wavelength. The current amplitudes at the feeding ends of the four helical arms are equal, and the phases are sequentially different by 90°. It has a cardioid pattern, good front-to-back ratio and excellent wide-beam circular polarization characteristics, and is widely used in satellite communication systems. Dual-frequency antenna means that one antenna frequency band contains two working frequency bands. At present, most of them adopt the combination of double four-arm helical structure to generate two antenna resonant frequency bands to cover the two frequency bands of ...

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Problems solved by technology

[0003] However, due to the narrow-band characteristics of the quadrifilar helical antenna, there are currently several defects: (1) the gain performance of the two frequency bands is inconsistent, which affects the overall performance of the antenna; (2) the respective bandwidths of the two frequency bands are narrow, especially in order to reduce After adopting media loading measures, the bandwidth performance is more difficult to achieve; (3) The two frequency bands affect each other, making antenna production more difficult, which is not conducive to mass production and application

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