Broadband high-efficiency and high-gain circular-polarized array antenna

Abstract

The invention belongs to the field of the millimeter wave antenna, and provides a broadband high-efficiency and high-gain circular-polarized array antenna which is suitable for a wireless communication system in Terahertz band. The broadband high-efficiency and high-gain circular-polarized array antenna comprises a broadband circular-polarized sub-array antenna unit and a broadband feed network; the broadband circular-polarized sub-array antenna unit comprises a sub-array feed network, a complementary phase shifter and a radiation unit; the sub-array feed network comprises a feed structure, a power-division coupling cavity structure and a coupling gap arranged on the upper surface of the power-division coupling cavity structure; the power-division coupling cavity structure is a square cavity having four corners with chamfers, and a perturbation structure is arranged at the centre of each of four sides; a coupling gap is correspondingly formed at each chamber position as the dual-polarized output port; the output port is connected with the complementary phase shifter, and the output end of the complementary phase shifter is connected with a radiation unit. The antenna provided by the invention adopts the broadband power-divider structure and the broadband phase shifter structure, so that the wide axial ratio bandwidth (more than 28.5%) and standing wave bandwidth (more than 28.5%) are provided.

Description

technical field [0001] The invention belongs to the field of millimeter-wave antennas, in particular to a wide-band, high-efficiency, high-gain circularly polarized array antenna. Background technique [0002] As the communication capacity gradually increases, the operating bandwidth and signal-to-noise ratio requirements of the communication system also increase; the antenna, as a key component of the wireless communication system, plays a decisive role in the overall performance of the communication system, such as: the polarization purity of the antenna and Gain directly affects the system signal-to-noise ratio. At present, the antennas designed and applied in the terahertz frequency band are mainly patch array antennas and planar reflectarray antennas. Due to the increased loss of the dielectric substrate in the terahertz frequency band, patch array antennas are difficult to design high-gain array antennas; at the same time, reflectarray The antenna has problems such ...

AI Technical Summary

Problems solved by technology

At present, the antennas designed and applied in the terahertz frequency band are mainly patch array antennas and planar reflectarray antennas. Due to the increased loss of the dielectric substrate in the terahertz frequency band, patch array antennas are difficult to design high-gain array antennas; at the same time, reflectarray The antenna has problems such as difficulty in improving the aperture efficiency and the installation accuracy of the feed antenna position

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