A planar reflectarray antenna

Abstract

The invention discloses a broadband planar reflective array antenna with a wider phase compensation range. The technical scheme adopted is as follows: the planar reflective array antenna includes a feed source and a conductive planar reflective array surface; the feed source is used for emitting or receiving electromagnetic waves; the conductive planar reflective array surface is used for scattering the electromagnetic waves emitted by the feed source into planar waves or receiving the planar waves and converging the planar waves onto the feed source; and a number of reflection units are distributed in an array on the conductive planar reflective array surface, and each reflection unit includes a phase hole and four branches distributed on the phase hole. The planar reflective array antenna is characterized in that twigs extend in the same direction from one side of the branches, the twigs extend near the edges of the phase holes, and slots for are formed between the twigs and the edges of the phase holes to adjust and control phase compensation and working frequency.

Description

technical field [0001] The invention relates to a planar reflection array antenna. Background technique [0002] With the development of communication technology, high-gain antennas are used more and more widely, especially in applications such as radar and satellite communication. As a new high-gain antenna, the planar reflectarray antenna has the advantages of light weight, small size, low cost, easy manufacture, easy assembly, and easy integration compared with the parabolic antenna; compared with the microstrip array antenna, it overcomes the The problem of large feed transmission loss. Therefore, it has become a research hotspot in the field of antennas since its birth, and it is one of the main research directions for large-scale high-gain antennas in the future. [0003] The traditional planar reflectarray antenna is also called the microstrip reflectarray antenna. The microstrip reflectarray antenna adopts the microstrip structure. The microstrip dielectric layer a...

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Problems solved by technology

[0003] The traditional planar reflectarray antenna is also called the microstrip reflectarray antenna. The microstrip reflectarray antenna adopts the microstrip structure. The microstrip dielectric layer as the unit support structure has many adverse effects on the performance of the reflectarray antenna. The dielectric layer increases the loss and reduces the gain

The second is that the microstrip dielectric layer is difficult to maintain flatness when working in an outdoor environment

The dielectric material is hygroscopic, absorbing air moisture under outdoor environmental conditions causes the dielectric layer to expand and shrink, resulting in warping of the dielectric layer and affecting the flatness of the reflective surface

The third is that the dielectric constant of the microstrip dielectric layer will change after moisture absorption, which will affect the phase compensation

Fourth, the structural stability of the microstrip dielectric layer is insufficient, and it is easy to be broken and damaged

[0005] The disadvantages of the above schemes are: as is known to researchers in this field, the reflectarray unit can achieve phase change by changing the size and length of the branches. In principle, the array unit requires a phase change of more than 360 degrees. Only when 360 degrees is satisfied can the phase angle be adjusted. Achieve comprehensive compensation, so that the reflectarray antenna achieves wide frequency band and good gain characteristics

The paper focuses on the description of the two structures, citing the data of the paper, and the basic scheme (such as Figure 11 shown) can achieve a phase change of 257 degrees, the preferred solution (such as Figure 12 shown) to achieve a phase change of 300 degrees, neither of which can achieve a 360-degree phase compensation

Limited by the phase compensation capability, the working frequency band is about 8.3%, and the antenna efficiency is not high

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