Broadband Dual Polarized Antenna

Abstract

The invention discloses a broadband dual-polarization antenna. Two or four parasitic radiation slots are arranged around the main body of each dual-polarization vibrator on the reflector, which can increase the front-to-back ratio of the antenna array by 2dB to 6dB, and to a certain extent Improved isolation metrics. In addition, the use of isolation components not only significantly improves the convergence of the S-parameters of the radiating unit, improves the impedance and isolation index of the antenna array, but also greatly improves the cross-polarization ratio index of the horizontal plane of the antenna array pattern, which satisfies the At present, base station antennas have a good application prospect in the communication field due to the high-performance requirements in wide frequency bands.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a broadband dual-polarization antenna. Background technique [0002] With the rapid development of mobile communication technology, the demand for broadband and high radiation performance base station antennas is gradually emerging. Broadband means that it has excellent impedance and isolation indicators in multiple mobile communication operating frequency ranges, and high radiation performance means that it has excellent radiation indicators. , especially the horizontal plane radiation index, in order to achieve a good coverage effect. [0003] The performance of a base station antenna depends primarily on the performance of the elements in the antenna array. At this stage, the VSWR and isolation indicators are mainly improved by optimizing the form and size of the radiation oscillator itself, but the degree of improvement in this way is limited, and it is difficult to me...

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Problems solved by technology

At this stage, the VSWR and isolation indicators are mainly improved by optimizing the form and size of the radiation oscillator itself, but the degree of improvement in this way is limited, and it is difficult to meet the wide-band multi-standard applications.

The cross-polarization ratio and the front-to-back ratio are two important indicators in the horizontal plane radiation characteristics. For ultra-wideband antennas, the high-frequency cross-polarization ratio and the low-frequency front-to-back ratio are two key factors that restrict the horizontal plane radiation performance. At this stage Mainly by optimizing the size of the radiation oscillator itself and simply changing the cross-sectional size of the reflector to improve the above indicators, but due to the limited degree of improvement, it is easy to cause cross-region interference in the low-frequency band and poor diversity reception in the high-frequency band. In addition, due to the usual It is said that the high-frequency cross-polarization ratio index becomes worse when it is downtilted, which also reduces the downtilt angle range of the antenna, thus limiting the use of base station antennas

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