Broadband low cross-polarization printed dipole antenna with parasitic element

Abstract

The invention discloses a broadband low cross-polarization printed dipole antenna with a parasitic element. The antenna has the advantages of broad frequency band, low cross-polarization, stable directional diagram, small size and simple structure. The antenna adopts a double-layer printed dipole way, and meanwhile, rectangular patches are uploaded on the upper end and at two sides of a dipole arm. The broadband low cross-polarization printed dipole antenna has the basic structure as follows: a metal earth plate, two layers of dielectric slabs, strip line feeding balun, a double-layer printed dipole arm, a rectangular patch arranged on the upper end of the dipole arm, rectangular patches arranged at two sides of the dipole arm and an SMA (Small A Type) joint. The greatest innovation of the broadband low cross-polarization printed dipole antenna is that the ultra broadband character and stable directional diagram character are obtained through uploading the parasitic elements in the manner of the rectangular patches on the upper end and at two sides of the double-layer printed dipole arm, 75% of bandwidth can be achieved under the condition that the standing-wave ratio is smaller than 1.5, and meanwhile, the broadband low cross-polarization printed dipole antenna has a stable directional diagram in the bandwidth, low cross-polarization and grain up to 6.1-9.3dBi. The size of the antenna is reasonably changed, i.e., other concrete embodiments of the invention can be formed.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to a printed dipole antenna, in particular to a double-layer printed dipole antenna with broadband and low cross polarization that can be used for wireless communication and phased array radar. Background technique [0002] Printed dipole antennas have the advantages of small size, light weight, simple structure, easy integration, and easy mass production, and are widely used in communications and radar. But it also has disadvantages such as narrow bandwidth and high cross polarization. In some applications, in order to improve the performance of the system, it is required that the antenna has broadband and low cross-polarization characteristics. For example, in a base station antenna, the antenna bandwidth needs to be increased in order to increase the data transmission rate. In a dual-polarized base station antenna, in order to ensure high polarization isolation, the a...

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Problems solved by technology

However, the size of the antenna is very large, and the distance between the parasitic unit and the dipole is about 1 / 4 wavelength, which is extremely inconvenient in practical applications

In the article "Equivalent-Circuit Analysis of a Broadband Printed Dipole With Adjusted Integrated Balun and an Array for Base Station Applications" (IEEE Transactions on antennas and propagation, 2009), RongLin Li et al. The position of the feed point of the integrated balun of the sub-antenna has been adjusted, from the upper feed of the dipole slot to the lower feed to facilitate the realization of dual polarization. At the same time, the impedance bandwidth of the antenna remains unchanged, but the relative The bandwidth is narrower, only 40%

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