Patch antenna with high cross polarization ratio and communication base station

Abstract

The invention discloses a patch antenna with a high cross polarization ratio and a communication base station. The patch antenna comprises a substrate, a metal reflecting surface, a main radiating surface and a parasitic radiating surface, wherein the main radiating surface is arranged on the upper surface of the substrate, and is provided with a main radiating sheet and a feed port, a convex structure is arranged at one end of the main radiating surface, the convex structure is an inverted T shape, the convex direction of the convex structure is the direction of the feed port and is parallel to the feed port, the two sides of the convex structure are connected with the feed port, the metal reflecting surface is positioned on the lower surface of the substrate and is integrally formed through a laser etching or selective electroplating technology, the parasitic radiating surface comprises a parasitic radiation sheet arranged right above the main radiation sheet in parallel, and the parasitic radiation sheet is fixed on the substrate through a support column. By adopting the structure, the convex structure is arranged on the main radiation sheet to improve the polarization purity of the main radiating surface, so that the cross polarization ratio of the patch antenna is further improved; and the structure adopts two-point feed, so that the patch antenna is simple in wiring.

Description

technical field [0001] The present application relates to the technical field of mobile communication base stations, in particular to a patch antenna with a high cross-polarization ratio and a communication base station. Background technique [0002] Traditional communication base station antennas mostly use ±45-degree cross-arranged dipole antennas as oscillators, which have the advantages of broadband, high isolation, and high cross-polarization ratio. However, in order to ensure good reflection characteristics of the dipole antenna, it is generally required to maintain a distance of about a quarter of a wavelength between the front of the dipole antenna and the ground. Reducing the height of the antenna array is a major trend in the era of 5G communication base station technology. Therefore, in the strict requirements of the 5G communication base station on the height of the antenna array, the dipole type of the dipole antenna does not have an advantage in reducing the h...

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Problems solved by technology

However, the patch antenna has the problem of relatively low cross-polarization ratio, and the cross-polarization ratio is an important index to measure the antenna radiation performance and coverage effect. Specifically, it refers to the ratio of the main polarization component of the antenna to the cross-polarization component, which reflects the is the polarization purity of the base station antenna, therefore, a low cross-polarization ratio will affect network coverage and uplink communication quality

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