A structure for realizing wide bandwidth angular scanning and its microstrip antenna unit

Abstract

The application belongs to the technical field of phased array radar antennas, and in particular relates to a structure for realizing wide bandwidth angular scanning and a microstrip antenna unit having the same. The structure includes: a metal floor, a feed layer dielectric substrate, a radiation layer dielectric substrate, a metal column and a metal patch. The lower surface of the dielectric substrate of the feeding layer is attached to the metal floor, and a copper layer is etched on the upper surface. The four corners of the dielectric substrate of the feeding layer are provided with first metal isolation walls. The first metal The isolation electric wall connects the metal floor and the copper layer; the radiation layer dielectric substrate is bonded to the upper surface of the feed layer dielectric substrate through a prepreg; the metal post is 1 / 4 cylindrical, and the metal post is arranged on the on the four corners of the radiation layer dielectric substrate, and the central axis of each metal column coincides with the side edge of the radiation layer dielectric substrate, and one end of the metal column is grounded; the metal patch is etched on the radiation layer The upper surface of the dielectric substrate is arranged around the metal post.

Description

technical field [0001] The application belongs to the technical field of phased array radar antennas, and in particular relates to a structure for realizing wide bandwidth angular scanning and a microstrip antenna unit having the same. Background technique [0002] With the continuous development of phased array radar technology, whether it is radar or electronic countermeasure system, in order to improve its own combat capability and range, in addition to requiring radar antenna broadband, it also requires large airspace coverage and wide-angle scanning. Therefore, it has become a key problem to be solved urgently to improve the working bandwidth of the phased array antenna while taking into account the wide-angle scanning characteristics. However, due to the mutual coupling between the phased array antenna elements, a sharp and deep concave point appears on a certain scanning angle before the grating lobe. At this time, the energy is totally reflected, and the antenna will...

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Problems solved by technology

[0003] The traditional active phased array radiating unit mostly adopts the form of Vivaldi and other end-fire antennas. This type of antenna can obtain a wider working bandwidth and a larger beam scanning angle, but it has the following defects: large volume and heavy weight restrict The large-area application of the antenna on the airborne platform; the characteristics of the high profile make its structural strength weaken as the height of the antenna increases; the installation structure of the antenna is complex and the assembly workload is large

Because it appears before the grating lobes, and some even appear at an angle not far from the side-firing direction, this will inevitably greatly reduce the scanning area of ​​the microstrip phased array antenna, resulting in a decline in the scanning performance of the entire array, making the microstrip antenna It is difficult to achieve wide-angle scanning while ensuring broadband operation

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