Dual-frequency band and dual round polarization rear radiation spiral antenna

Abstract

The invention discloses a double circular polarization backfire antenna for double band, which comprises a high-frequency circular polarization antenna component (2), a low-frequency circular polarization antenna component (3) and a reflecting cavity component (1) mutually used by the two; the high-frequency circular polarization antenna component (2) comprises a high-frequency feeding component (21) and a high-frequency primary radiator; the low-frequency circular polarization antenna component (3) comprises a low-frequency feeding component (31) and a low-frequency primary radiator; the high-frequency and low-frequency feeding components are formed by the metal helical wires twisting on medium supports of the helical wires; the low-frequency circular polarization antenna component (3) is sheathed on the outside of the high-frequency circular polarization antenna component (2), and the two are coaxially fixed on the center position of the reflecting cavity component (1); the rotary directions of the metal helical wires of the high-frequency and low-frequency feeding components are opposite. The reception and transmission of the antenna of the invention separately work in two different bands, and two polarizations of the double circular polarization antenna are perpendicular to each other, thereby increasing the polarization isolation between the two bands and improving the overall performance of the system.

Description

technical field [0001] The invention relates to antenna technology in the field of wireless communication, in particular to a dual-band dual-circularly polarized helical back-firing antenna that is simultaneously applied to reception and transmission. Background technique [0002] The backfiring antenna has the characteristics of high gain and so on, and has a wide range of applications, but this type of antenna has the following disadvantages: First, the backfiring antenna is generally single-band, multi-band or wide-band, and the backfiring antenna is generally linearly polarized or Circular polarization, for increasingly tight frequency resources, the antenna itself cannot achieve good polarization isolation. The second is that the backfiring antenna generally adopts a cylindrical reflection cavity, but this conventional reflection cavity cannot guarantee the maximum antenna gain under a given aperture size. [0003] Chinese Patent No.: ZL93222793.X "A High-Performance S...

AI Technical Summary

Problems solved by technology

[0002] The backfiring antenna has the characteristics of high gain and so on, and has a wide range of applications, but this type of antenna has the following disadvantages: First, the backfiring antenna is generally single-band, multi-band or wide-band, and the backfiring antenna is generally linearly polarized or Circular polarization, for increasingly tight frequency resources, the antenna itself cannot achieve good polarization isolation

The second is that the backfiring antenna generally adopts a cylindrical reflective cavity, but this conventional reflective cavity cannot guarantee the maximum antenna gain under a given aperture size.

Chinese Patent No.: ZL96108158.9 "Circularly Polarized Backfiring Antenna" discloses a circularly polarized backfiring antenna. The backfiring antenna uses a helical antenna as the primary radiator. The antenna is circularly polarized, but belongs to a single circle Polarized antenna; the frequency band characteristic of the invention is not dual-band, and the antenna uses a standard cylindrical reflector cavity, which cannot maximize the antenna gain, and the minimum gain is only 2.0dB

Chinese Patent No.: ZL03154514.9 "Multi-Band Helical Antenna" introduces a multi-band helical antenna. Although the helical antenna is multi-band, it does not belong to the category of back-firing antennas, and it uses a single helix to achieve multi-band , so it does not have dual circular polarization characteristics

The working principle of the microstrip antenna is very different from that of the backfiring helical antenna. Since the helical antenna is a natural circularly polarized antenna, good circular polarization can be achieved without any additional technology, while the microstrip antenna needs to use double feed points to achieve circular polarization. Technology or corner cutting technology, it is more complicated to realize circular polarization, and the circular polarization characteristics are worse than the back-firing helical antenna

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