Small ultra-wide beam cavity-backed two-layer microstrip antenna and wide-angle scanning array thereof

Abstract

The invention belongs to the field of antenna technology, and discloses a small ultra-wide beam cavity-backed two-layer microstrip antenna and a wide-angle scanning array thereof. A parasitic dielectric substrate is located on the upper layer of the small ultra-wide beam cavity-backed two-layer microstrip antenna; a metal back cavity is located at the lowermost layer of the small ultra-wide beam cavity-backed two-layer microstrip antenna; and the metal back cavity is a metal cavity in a rectangular form, which closely surrounds a radiation medium substrate and the parasitic dielectric substrate. The invention adopts single point feed to radiate linearly polarized electromagnetic wave. Since the circular microstrip patch is of a small size and a compact structure, the side length of the whole antenna is less than 0.46[lambda]; the antenna thickness is less than 0.16[lambda]; the antenna impedance bandwidth is more than 14%; and the E-plane half-power beam width can reach 190 degrees. For a multi-element linear array assembled by the antenna, the space between elements is less than 0.44[lambda], and the gain is only reduced by 3dB in the scanning range of the E-plane + / - 82 degrees.The invention may also constitute an operating mode of dual-linear polarization and circular polarization.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a small ultra-wide beam cavity-backed double-layer microstrip antenna and a wide-angle scanning array thereof. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: in the development process of antennas, there are increasingly higher requirements for the performance of high directivity and fast variable beams. Before the appearance of the phased array antenna, the traditional mechanical scanning antenna can only realize the scanning of the antenna through mechanical rotation, and the phased array antenna has been widely used since its appearance because of its high-speed and accurate beam scanning. Generally speaking, the limit scanning angle of the phased array antenna is about ±60°. Whether it is a radar system or an electronic countermeasure system, in order to expand its target search range, improve its survivabil...

AI Technical Summary

Problems solved by technology

There is a certain distance between the three-dimensional floor and the microstrip patch, which increases the section height of the antenna when used, and this method is not conducive to processing

[0004] To sum up, the problems existing in the prior art are: the height of the antenna is limited in the existing mobile communication, and when the size is limited, the beam width of the antenna is relatively narrow

Generally, the maximum radiation direction of the antenna is located in the direction of the zenith. As the irradiation angle increases, the gain of the antenna will decrease, and the gain at low elevation angles will be very low, so that the beam width of the antenna will become narrower.

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