Microwave antenna and outer cover thereof

Abstract

The invention discloses a microwave antenna and an outer cover thereof. The outer cover is a rotational symmetric element which comprises a plurality of homocentrically arranged parts as below: a compensation part arranged at the middle of the outer cover and used for compensating the phase delay of the electric field distribution at the middle of an antenna aperture surface caused by the shielding of a feed source, a main reflection part arranged at the periphery of the compensation part and used for reflecting the electromagnetic wave emitted from the microwave antenna feed source to a specific direction deviating from the feed source, and an assistant reflection part arranged at the periphery of the main reflection part and used for carrying out reflex bunching on the edge diffraction electromagnetic wave of the microwave antenna. All the parts of the outer cover are especially designed and shaped, therefore the microwave antenna has the characteristics of excellent electrical properties, stable structure, low cost and the like.

Description

【Technical field】 [0001] The invention relates to the field of communication antennas, in particular to a microwave antenna and its outer cover. 【Background technique】 [0002] With the increasing demand for microwave communication, the point-to-point or point-to-multipoint communication network composed of microwave antennas is becoming more and more dense, and the potential risk of mutual interference between microwave systems is increasing. To this end, various administrative authorities and network operators have formulated strict standards to limit the radiation pattern envelope (Radiation Patterns Envelope, RPE) of microwave antennas, and then select antennas that meet different standard levels according to different network requirements. Among the electrical performance indicators of the antenna, the Front-to-Back Ratio (F / B) is particularly important and must be considered in the design of the antenna. [0003] The radome is an important component of the microwave a...

AI Technical Summary

Problems solved by technology

[0008] 1) The loss of antenna gain is mainly caused by the insertion loss introduced by the radome. Therefore, it is required not only to choose a low-loss dielectric material but also to design its thickness reasonably to achieve the best wave transmission performance when designing the radome;

[0009] 2) Increase the return loss of the antenna, that is, deteriorate the input voltage standing wave ratio (VSWR) of the antenna, which is mainly caused by the reflected electromagnetic wave caused by the radome returning to the feed source;

[0011] 4) Deteriorating the F / B performance of the antenna, which is mainly due to the fact that the radome disturbs the diffraction field distribution at the edge of the antenna mouth, and even the radome plays a role of "guiding" the diffraction field backwards, thereby improving the antenna's back radiation

[0013] 1) The frequency bandwidth is limited, so it is not suitable for broadband antenna systems;

[0014] 2) Since the edge of the radome is usually not specially shaped, it has a great influence on the RPE of the antenna, especially the F / B;

[0015] 3) The mechanical strength of the flat radome is poor

[0016] Although the concave radome can be designed with a certain cone angle to obtain wider frequency band characteristics, the impact on RPE, especially F / B performance is often not considered; in addition, the mechanical strength and wind load performance of the concave radome bad

[0017] The convex radome can obtain better frequency band characteristics and F / B performance through a certain shape design, and the mechanical strength and wind load performance are also better, but in terms of the impact on RPE performance, the convex radome is at most It is difficult to improve without deterioration; in addition, the convex radome will increase the overall size of the antenna, thereby increasing packaging and transportation costs

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