Sequence feed circularly polarized antenna with broadband phase shift network

Abstract

The invention discloses a sequence feed circularly polarized antenna with a broadband phase shift network. The antenna comprises a metal cavity with an opening in the top surface, and a patch radiation unit is arranged at the opening of the metal cavity; the patch radiation unit and the metal cavity form a back cavity; a printed circuit board is arranged at the bottom of the back cavity; a broadband phase shift network, a feed input end and four feed output ends are formed on the printed circuit board, wherein one feed input end is connected with four feed output ends through a broadband phaseshift network, four coupling feed columns are arranged on the printed circuit board, the bottom ends of the four coupling feed columns are in feed connection with the four feed output ends respectively, and the top ends of the four coupling feed columns perform sequence feed on the patch radiation unit. According to the invention, broadband phase shift can be realized, and good axial ratio characteristics of the antenna are ensured.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a serially fed circularly polarized antenna equipped with a broadband phase-shifting network. Background technique [0002] With the rapid development of information and electronic technology, communication systems have higher and higher requirements on the performance of antennas. Especially in the fields of satellite navigation and machine-to-machine communication, circularly polarized antennas are required to have high gain, low profile, and broadband axial ratio. For traditional circularly polarized antennas, the use of angle cutting or multi-feed point sequence feeding can effectively improve the performance of the antenna. Guarantee the requirements of broadband phase shift, resulting in the deterioration of the axial ratio in the broadband, affecting the quality of communication. With the continuous commercialization of navigation systems and the development of inter-de...

AI Technical Summary

Problems solved by technology

For traditional circularly polarized antennas, the use of angle cutting or multi-feed point sequence feeding can effectively improve the performance of the antenna. Guarantee the requirements of broadband phase shift, resulting in the deterioration of the axial ratio in the broadband, affecting the quality of communication

With the continuous commercialization of navigation systems and the development of inter-device communication technology for cluster UAVs, serial feed circularly polarized antennas with broadband phase-shifting networks have higher and higher requirements for wideband antennas and low elevation-to-axis ratios. Ordinary phase-shifting network can no longer meet the requirements of the circular polarization antenna broadband axial ratio, resulting in the deterioration of the axial ratio of the antenna in the broadband, the reduction of the antenna gain component, and the impact on communication quality

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