Wide angle scanning ellipsoidal dielectric lens antenna based on phased array feed

Abstract

The invention discloses a wide angle scanning ellipsoidal dielectric lens antenna based on phased array feed applied to a wide-angle scanning and multi-beam directional communication system. Its basicstructure consists of an elliptical dielectric lens with five layers of dielectric and a 1*9 phased array with a microstrip patch as elements. The lens antenna is compressed in thickness by conversion optics, keeps the focusing performance of the original spherical Luneberg lens; at the same time, the antenna is easy to process because the dielectric constant range is controlled; according to thesuperposition algorithm of element patterns, he element amplitude and phase of the phased array are optimized, so that the accurate wide-angle scanning is realized, and the gain is improved comparedwith the phased array. The application of the phased array fed lens antenna in the lower profile and wide-angle scanning is better solved, and it can play a better role in the multi-beam directional communication and wide-angle scanning system. Based on the basic structure of the invention, other specific embodiments of the invention can be formed by reasonably changing the filling medium type, antenna size, feed unit form and array arrangement mode.

Description

Technical field [0001] The present invention belongs to the technical field of antennas, and relates to an ellipsoidal dielectric lens antenna, specifically a phased array feed-based wide-angle scanning ellipsoidal dielectric lens antenna for beam scanning and multi-beam communication, and is especially suitable for working in millimeters. Use scenarios such as wave band, lower profile, wide-angle scanning, and 5G communication. Background technique [0002] Multi-beam antennas have become an important branch of modern antennas. With the urgent demand for multi-beam antennas in the fields of ship navigation, satellite communications, electronic countermeasures and target tracking, it has high gain, low sidelobe, wide scanning angle, and high-speed scanning. And multi-beam antennas with low manufacturing cost are focused on. Based on the above requirements, the present invention designs a wide-angle scanning ellipsoidal dielectric lens antenna based on phased array feeding, which...

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Problems solved by technology

Japan's Sumitomo Electric Industries Co., Ltd. foams the foamed plastic beads through the mold opening method in the patent CN 101057370, but the process flow of this method is very complicated and the foaming uniformity is difficult to control, and the processing conditions are very high, resulting in processing costs. Uncontrollable, difficult to mass produce

American patent inventor Michael.P.Carpenter et al. disclosed in the patent No. US 6433936 B1 titled "Lens of GradientDielectric Constant and Methods of Production" that thermoplastic resin expansion beads (polystyrene, polyamide, etc.) were doped with ceramic materials (titanium dioxide, silicon dioxide, etc.) are filled into the mold, and heated to melt them together, and the dielectric constant of each spherical shell is controlled by adjusting the density of the foam molding and the ceramic content. Good practicability, but the process is relatively complicated, not suitable for mass production

In 2011, the team of Professor Cui Tiejun from Southeast University used electromagnetic metamaterials to design a The Lunberg lens antenna works in the Ku band, but because the metal-attached PCB board is used to realize the metamaterial, the loss of the antenna is too large, and the antenna aperture efficiency is very low

In the patent with the publication number CN107627611A, a spherical Lunberg lens design method based on 3D printing technology is disclosed, the cost is a quarter of the traditional layered structure, and the dielectric constant of each basic unit is adjustable, but at least The dielectric constant of one material is not greater than 1, and the dielectric constant of at least one material is not less than 2. The same material cannot be used for processing, and materials with a dielectric constant of not greater than 1 are actually difficult to achieve

In the patent with the publication number CN107369876A, a hemispherical lens and a reflective floor antenna structure are disclosed. The relative position of the lens is adjusted by the mechanical arm to scan the beam as a whole, and the real-time performance is poor.

In 2014, Hao Yang et al. published a paper titled "Flat Luneburg Lens via Transformation Optics for Directive Antenna Applications" on IEEE Transactions On Antennas and Propagation, using variable optics to successfully compress the spherical Luneburg lens into a cylindrical dielectric lens, but through mechanical movement Feed scanning only reaches 34°, and the dielectric constant of the innermost layer is as high as 12, which is difficult to realize and the actual processing cost is high

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