Antenna and array antenna

Abstract

The invention discloses an antenna. The antenna comprises a broadband dual-polarized radiation unit and a reflecting plate, wherein the broadband dual-polarized radiation unit comprises a support part and four vibrator arms in different shapes; the four vibrator arms are located at the same plane and arranged in an array with two rows and two columns to form two pairs of orthogonally polarized dipoles; as the diagonal line of the array serves as an axis, the four vibrator arms are in an asymmetric structure with respect to the axis; the vibrator arms are of hollow quadrangular structures; the four vibrator arms are connected with the four corners of the support part; the support part is located below the vibrator arms and is vertical to the plane of the vibrator arms; each vibrator arm is provided with a clipped corner near the corner part in the center of the array, and is connected with a corner part of a corresponding support part at the clipped corner; the support part is of a hollow structure; a groove with equal height and equal width is formed in the middle part of each wall surface of the support part. With the adoption of the embodiment of the invention, impedance bandwidth of single radiation unit can be increased efficiently, and the isolation degree and the cross polarization ratio of the radiation unit are improved.

Description

technical field [0001] The invention relates to the technical field of mobile communication antennas, in particular to an antenna and an array antenna. Background technique [0002] In recent years, the 4G communication technology dominated by LTE has developed very rapidly, and the domestic market is about to enter the commercial stage. The market demand for 1710-2690MHz broadband base station antennas that can cover multiple frequency bands is increasing. Base stations working at this frequency The antenna can cover frequency bands such as DCS (1710-1880MHz), PCS (1850-1990MHz), UMTS (1920-2170MHz), TD-SCDMA (1880-2690MHz) and WIMAX and WIFI (2400-2500). The performance of the antenna radiating unit basically determines the performance of the array antenna, and the relative bandwidth of 1710-2690MHz reaches 44%, which requires the antenna radiating unit to have ultra-wideband performance, and puts forward higher requirements for impedance matching and isolation. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] The vibrator arm of this structure enables a single radiating unit to meet the requirements, but when forming an array (the array is usually composed of 2 to 10 radiating units), it has a great influence on the isolation. Often the isolation after forming the array is only about 22dB. Far below the requirement of 28dB

Therefore, it is necessary to add various sheet and strip metal sheets between the radiating units or under the vibrator arms to barely solve the problem of isolation, but it increases the difficulty and cost of production

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