Broadband dual polarized antenna

Abstract

The invention discloses an integrated broadband dual polarized antenna, which comprises a radiator and a balanced feeding device, wherein the balanced feeding device is simultaneously formed into a supporting arm of an antenna oscillator; the radiator is a symmetric radiation array consisting of four radiation units; each radiation unit consists of two branches which are bilaterally symmetric and each branch is provided with hollow holes so as to form parallel current paths; the tail ends of the two branches are connected through a connecting arm so that the left and right branches of each radiation unit form a closed electromagnetic loop; the balanced feeding device comprises two pairs of U-shaped baluns which are mutually orthogonal and of which bottoms are connected; four supporting planes are formed at the top part of the balanced feeding device and are supported at the connecting parts of the radiation units respectively; and the balanced feeding device is integrated with the radiator. The integrated broadband dual polarized antenna is simple in structure, convenient in mounting, easy in feeding, good in consistency and easy to produce, and has the advantages of small horizontal wave beam width fluctuating with frequency, good cross polarization characteristic, high gain and high front-to-back ratio.

Description

[technical field] [0001] The invention relates to the field of mobile communication base station antennas, in particular to a broadband dual-polarization antenna. [technical background] [0002] With the development of mobile communication technology, higher and higher requirements are put forward for the index requirements of dual-polarized base station antennas, especially bandwidth characteristics, half-power angle fluctuation characteristics with frequency, and cross-polarization characteristics. The base station antenna is generally combined into an array form by radiating elements of the same form to obtain high gain, so the index of the dual-polarized antenna array element will directly affect the performance of the entire antenna. At present, the dual-polarized antenna element mainly adopts the following two implementation forms: [0003] 1. Two pairs of co-located, interleaved and orthogonally polarized antenna dipole structures are adopted; [0004] 2. Dual polar...

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Problems solved by technology

[0005] The first solution above is generally composed of conventional dipoles or folded dipoles. The horizontal beamwidth of the antenna dipole varies greatly with frequency, the gain of the antenna dipole is relatively low, and the cross-polarization is generally not good.

The second solution requires four feeding points, which is likely to cause current imbalance between the antennas, and the assembly is troublesome, the consistency is poor, and the cross-polarization of the combined oscillator is still biased, so it is rarely used in the frequency band of 2GHz or above.

[0006] At present, the first scheme is widely used, such as Chinese patent No. ZL 200620145421.4, ZL 200720170443.0, ZL 200720170876.6 and ZL03208478.1 documents, all describe a method of improving the balance of the oscillator radiation space through balanced feeding to improve the cross-pole However, the above-mentioned design is generally a split design, with many components and complex structure, it is difficult to realize an integrated design, and the reliability of mass production is poor.

The document with the Chinese application number 200710188585.4 describes a broadband dual-polarization vibrator unit with simple structure and low cost. The vibrator unit is directly processed into half-wave dipoles from aluminum, and then fed through a strip line, but each The vibrator is composed of four individual radiation arms fixed through the positioning holes on the reflector, which will easily cause poor positioning consistency of the vibrator, which will have a negative impact on subsequent reliability tests

Higher integration, such as the broadband dual-polarization radiation unit disclosed in Chinese Patent No. ZL 200320119738.7, has a simple and compact structure, is easy to manufacture, low cost and easy to assemble and install, but the gain of the broadband dual-polarization radiation unit is low , the beamwidth fluctuates greatly with frequency

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