Array antenna and antenna isolation assembly

Abstract

The invention provides an array antenna. The array antenna comprises a reflection plate and a high-frequency resonant unit, a low-frequency resonant unit and C-shaped resonant rings which are arrangedon the reflection plate, wherein the C-shaped resonant rings are arranged at an outer side of the high-frequency resonant ring relative to an axis in a paired way, and openings of the C-shaped resonant rings in the paired way face to each other. The C-shaped resonant rings combined and used in the paired way are used as hidden isolation strips of the array antenna, so that the problem that a conventional isolation means cannot be implemented due to limited internal space is solved, the array element installation space is not occupied, a relatively high isolation effect also can be achieved, and a relatively high suppression effect on cross polarization is achieved. The C-shaped resonant ring hidden isolation strips are electromagnetically coupled between the resonant rings, so that an electromagnetic field among array elements is limited between the C-shaped resonant rings, a propagation passage of the electromagnetic field is changed, the coupling among the array elements is reducedor eliminated; and moreover, since the scattering cross section of each resonant ring is small, the generated cross polarization is far lower that of the conventional means.

Description

【Technical field】 [0001] The present invention relates to the communication field, in particular to an invisible isolation component composed of a pair of resonant rings, and an array antenna which uses the invisible isolation strips to improve the isolation effect. 【Background technique】 [0002] As a key front-end component of the wireless communication system, the performance of the antenna plays a decisive role in the quality of the operator's network. In recent years, with the rapid increase in the number of mobile users, the communication system is constantly being updated and expanded, which puts forward higher and higher requirements for antenna design. With the development of base station antennas towards miniaturization and light weight, at the same time, wireless communication proposes higher performance indicators such as high gain, broadband / multi-frequency, multi-beam, low sidelobe, high isolation, high and low frequency, and even different polarization The di...

AI Technical Summary

Problems solved by technology

With the development of base station antennas towards miniaturization and light weight, at the same time, wireless communication proposes higher performance indicators such as high gain, broadband / multi-frequency, multi-beam, low sidelobe, high isolation, high and low frequency, and even different polarization The array of directions is nested and installed in the narrow internal space of the antenna. Traditional isolation methods, such as isolation bars, metal partitions, and parasitic units, cannot be installed because of insufficient space, or cannot be implemented because the parasitic effect is too significant.

In principle, conventional isolation methods use the scattering or resonance of electromagnetic waves at metal plates, metal strips or slits to weaken the incident field, thereby reducing near-field coupling. Although there is isolation effect, it is inevitable to generate new polarization. component, causing poor cross-polarization; and when the metal partition or spacer is too close to the array element, it will cause a large parasitic inductance or parasitic capacitance, which will seriously affect the impedance matching

For array antennas with small spacing (spacing less than half of the center wavelength), the lack of effective isolation will inevitably lead to serious deterioration of performance indicators, such as: cross polarization, side lobe level increase, gain drop, beam deviation, direction Figure 1 Consistency variation etc.

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