A wideband dual-polarized base station antenna for imt-advanced systems

Abstract

The invention discloses a base station antenna that is applied to an international mobile telecommunication-advanced (IMT-Advanced) system of a fourth generation wireless mobile communication system. The antenna unit employs a mode of multi-layer microstrip paster antenna and a basic structure of the antenna comprises a metal reflecting plate, a microstrip feeding layer, two radiating layers and a plurality of nylon insulating columns. The greatest innovation of the invention lies in an ultrabroad band characteristic of the antenna; a novel arrowhead coupling feeding groove and a double-layer radiation patch are employed; and a bandwidth can reach 49.5% on the condition that a standing-wave ratio is less than 1.5. On the basis of a reasonable design of a reflecting plate, a half-power lobe width of the antenna is a value caused by adding 6 degrees to 65 degrees or by subtracting 6 degrees from 65 degrees in a whole working frequency band range; and a convergence degree of a wave beam of the antenna has a good performance. According to the invention, a corner feeding mode is employed to carry out feeding and a dual polarization with plus / minus 45 degrees is realized on the condition that it is avoided that a radiation patch is rotated by 45 degrees, so that it is beneficial to reduce a whole length of an antenna array after arrangement of the array. On the basis of the basic structure that is based on the technical scheme of the invention, other concrete embodiments of the invention can be constructed only by reasonably changing a size of a radiation patch, a shape of a slotted floor and spaces between all layers.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to a microstrip patch antenna, in particular to a broadband dual-polarization base station antenna for the fourth-generation wireless mobile communication system IMT-Advanced. Background technique [0002] ITU (International Telecom Union) issued a circular letter to countries in February 2008 to solicit IMT-Advanced technical proposals from countries and standardization organizations. In October 2009, IMT-Advanced, the air interface standard for the new generation communication system, was completed. (International Mobile Telecommunication-Advanced) solicitation. IMT-Advanced is launched by ITU to meet the needs of global mobile communications in the next 10 to 15 years. It is defined as a mobile system with new capabilities beyond IMT-2000. This system can provide a wide range of telecommunication services: mobile and fixed The network supports an increasing number of a...

AI Technical Summary

Problems solved by technology

The feeding structure of this antenna is complex, since the two feeding ports are on the same plane, an air bridge must be used

Shi-Chang Gao et al. introduced a slot-coupled broadband dual Polarized antenna, this antenna also uses a double-layer radiation patch, which can achieve a bandwidth of 20.9% when the VSWR is less than 1.5. The antenna must be rotated 45° as a whole, so the overall length of the antenna array will inevitably increase after the formation of the array

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