An ultra-broadband circularly polarized cavity-backed crossed-dipole antenna

Abstract

The invention discloses a novel ultra-broadband circularly polarized cavity-backed crossed dipole antenna, which includes a crossed dipole, a coaxial transmission line, and a composite back cavity. The crossed dipole is placed above the composite back cavity. The coaxial transmission line is connected to the crossed dipole after passing through the composite back cavity; the crossed dipole includes a dielectric plate, a phase delay line and a plurality of metal radiation arms, and the plurality of metal radiation arms are evenly located On the upper and lower sides of the dielectric plate, the metal radiation arms located on the same side are connected by the phase delay line, so that orthogonal phases are generated between the metal radiation arms to excite circularly polarized electromagnetic waves. The cross dipole antenna of the present invention can realize ultra-wideband impedance bandwidth and axial ratio bandwidth, which is of great significance for further broadening the application field of the cross dipole antenna. The cross dipole antenna of the present invention has a very compact structure, is easy to integrate with the system, and is beneficial to the miniaturization design of the system.

Description

technical field [0001] The invention relates to the technical field of electromagnetic environment perception and testing, in particular to an ultra-wideband circularly polarized cavity-backed crossed dipole antenna. Background technique [0002] Compared with linearly polarized antennas, circularly polarized antennas have the advantages of anti-multipath interference and eliminating polarization mismatch. At the same time, in the transceiver system, when using circularly polarized antennas, there are no strict requirements on the alignment of the transceiver antennas. Based on the above excellent characteristics, circularly polarized antennas have been widely used in electromagnetic environment perception and testing, and wireless communication systems. However, due to the extensive use of electronic systems, they will radiate electromagnetic signals with wide frequency bands, different energies, and different polarizations into space when they work, making the space electr...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing crossed dipole antenna has insufficient bandwidth and large antenna size, the present invention proposes an ultra-wideband circularly polarized cavity-backed crossed dipole antenna, which has ultra-wideband impedance bandwidth and axial ratio bandwidth. Not only can the relative bandwidth be as high as 125.2% impedance bandwidth and 120.1% axial ratio bandwidth, but also has a compact structure with a relative size of 0.54λ 0 ×0.54λ 0 ×0.23λ 0 , easy to promote the development of high-confidence testing technology for complex electromagnetic environments

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