High octave dual-polarized Vivaldi antenna

Abstract

The invention discloses a high octave dual-polarized Vivaldi antenna. After a radiation element is led into the boundary S2, the impedance bandwidth of a low frequency end of the dual polarized antenna is improved, which is mainly represented in the 3-8 GHz working frequency band. After the radiation element is led into the boundary S3, the radiation performance of the antenna is improved. Since the radiation element is led into the boundary S2 and the boundary S3 and the antenna is equipped with a tray and a bottom metal ring, the impedance of the low frequency end of the dual polarized antenna is improved, the impedance bandwidth of the antenna is expanded and the small size design is achieved at the same time. Since the radiation element is led into the boundary S2 and the boundary S3 and the antenna is equipped with the tray and the bottom metal ring, and after the radiation element is loaded with periodical slots, the matching performance in the whole frequency band is improved in different levels. By adopting a medium lens type antenna shade provided with a fixing chute, effects of mounting and fixation and physical protection are achieved and the directivity and the gain of the antenna are improved at the same time. Compared with a traditional antenna, unexpected performance such as comparatively high cross polarization and dissymmetry of radiation pattern caused by dissymmetry of electric fields are avoided.

Description

technical field [0001] The invention belongs to the technical field of ultra-wideband dual-polarization antennas, and in particular relates to a high-octave dual-polarization Vivaldi antenna, which can be applied to wide-band time-domain radars and communication systems that have higher requirements on the fidelity of signal time-domain waveforms middle. Background technique [0002] Time-domain radar and communication systems use the time-domain characteristics of electromagnetic waves, so they have high requirements for the fidelity of the time-domain waveform of the signal. In addition, the time-domain antenna must simultaneously meet the requirements of wide instantaneous bandwidth, flat phase response in the band, and stable phase center. From the perspective of broadband antennas: the time-domain signal fidelity of the ridged TEM horn antenna and the Vivaldi antenna is better, while the logarithmic periodic antenna and the cavity-backed Archimedes spiral antenna have ...

AI Technical Summary

Problems solved by technology

At present, although many scholars have made great progress in the ultra-wideband and miniaturized design of the classic Vivaldi antenna, when it is suitable for radar or communication systems with 2-18GHz or even wider frequency bands, its antenna design and engineering applications still need to be done. further refine or improve

[0007] The existing classic Vivaldi antenna structure is shown in Figure 1. Whether it is a wide-band miniaturized Vivaldi antenna or a dual-polarized Vivaldi antenna, the octave band impedance bandwidth of the antenna is basically less than 6, and the miniaturized antenna loaded with resistors not only reduces the radiation efficiency of the antenna , also increased the structural complexity and processing difficulty

[0008] The structure of the extended Vivaldi antenna is shown in Figure 2. Compared with the classic Vivaldi antenna, the bandwidth characteristics of the antenna can be greatly expanded, and the main performance is that the high frequency end can be extended to extremely high frequencies. However, due to the asymmetry of the electric field, the cross polarization is relatively weak. high

[0009] The structure of the balanced paired Vivaldi antenna is shown in Figure 3. Compared with the paired Vivaldi antenna: the upper and lower electric fields are basically symmetrically distributed, but the left and right electric fields are asymmetrical, resulting in an asymmetrical pattern and unsatisfactory radiation characteristics.

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