Broad-band back-reflection helical antenna

Abstract

The present invention discloses a wide-band backfire spiral antenna, including a feeder module (1), a primary radiator and a reflection cavity. The feeder module (1) consists of a connecting column (11), a transitional feeding medium (12), a conversion feeding medium (13), an external feeding conductor (14), an internal feeding conductor (15), a cable (16) and an electric connector (17), which are connected accordingly. The primary radiator is formed by winding a metal spiral wire (5) on the medium support of the spiral wire (4). The reflection cavity includes a reflection tray (2) and a reflection cavity (3). The filing medium in a transforming feed medium (13) is air. The reflection cavity is the ode-shaped reflection cavity. The antenna of the invention can widen the bandwidth, and the relative bandwidth reaches to 30% above. And the antenna has the advantages of simple structure and good consistency. At the same time, a technique of combining the backfire spiral with the ode-shaped reflection cavity is adopted to improve the aperture utilization ration of the antenna. And the gain of the antenna reaches to 10dB above.

Description

technical field [0001] The invention relates to antenna technology in the field of wireless communication, in particular to an antenna with high requirements on broadband characteristics and circular polarization characteristics. Background technique [0002] There are relevant literature reports on backfiring antennas with oscillators or crossed oscillators as primary radiators. This type of antenna is generally composed of two parts: a primary radiator and a cylindrical reflective cavity. The cylindrical reflective cavity converts the electromagnetic waves back-radiated by the primary radiator into Electromagnetic waves that radiate forward with high gain. However, this type of antenna has three disadvantages: First, the antenna bandwidth is relatively narrow, generally about 10% of the relative bandwidth. Narrow, which cannot meet the requirements of modern communication capacity for antenna bandwidth; second, the circular polarization characteristics of the antenna can ...

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Problems solved by technology

However, this type of antenna has three disadvantages: First, the antenna bandwidth is relatively narrow, generally about 10% of the relative bandwidth. Narrow, which cannot meet the requirements of modern communication capacity for antenna bandwidth; second, the circular polarization characteristics of the antenna can hardly be satisfied in a wide frequency range, and only have a better circular polarization axis ratio in a narrower frequency range , the ratio of the circular polarization axis becomes worse in the broadband range, even greater than 3dB, and the cross-polarization component increases sharply, which cannot meet the requirements of modern communication for the circular polarization characteristics of the antenna, because the advanced and efficient modulation method of modern digital communication has a large impact on The axial ratio and cross-polarization of circularly polarized antennas have strict requirements; the third is that the backfiring antenna generally uses a cylindrical reflector cavity, but this conventional reflector cavity cannot guarantee the maximum antenna gain under a given aperture size

Patent No.: ZL96108158.9 "Circularly Polarized Backfiring Antenna", which is composed of a primary radiator and a cylindrical reflective cavity. The cylindrical reflective cavity converts the electromagnetic waves back-radiated by the primary radiator into high-gain forward-radiated electromagnetic waves , the backfiring antenna uses a helical antenna as the primary radiator, the antenna is circularly polarized, but it belongs to a narrow-band antenna, which can be used in UHF, L, S, C, X and other frequency bands, and the antenna uses a standard cylindrical reflector cavity , the antenna gain cannot be maximized, and the minimum gain is only 2.0dB; the article does not mention the situation of circular polarization axis ratio

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