Soft surface structure-based patch array antenna

Abstract

The invention provides a soft surface structure-based patch array antenna, and aims at achieving miniaturization while keeping high gain of the patch array antenna. The soft surface structure-based patch array antenna comprises five dielectric plates which are stacked from top to bottom, wherein a first composite metal band is printed on the first dielectric plate; a second composite metal band and m*n upper radiating elements are printed on the second dielectric plate and each upper radiating element comprises 2*2 upper radiation patches; m*n first plated through holes are arranged in the third dielectric plate, a third composite metal band and m*n lower radiating elements are printed on the upper surface of the third dielectric plate, each lower radiating element comprises 2*2 lower radiation patches and a main radiation patch, an internal grounding plate is printed on the lower surface of the third dielectric plate and m*n feed via holes are etched in each internal grounding plate;the first composite metal band, the second composite metal band and the third composite metal band form a soft surface structure; m*n second plated through holes are arranged in the fourth dielectricplate; and an external grounding plate is printed on the lower surface of the fifth dielectric plate and a feed network is printed on the upper surface of the fifth dielectric plate.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a patch array antenna, in particular to a patch array antenna based on a soft surface structure, which can be used in wireless communication fields such as vehicle-mounted devices. Background technique [0002] With the rapid development of modern wireless communication systems in the world, the performance requirements of antennas are getting higher and higher, such as strong directivity, high gain, narrow beam, small size, etc. A single antenna generally cannot meet the requirements, so it is necessary to build an array antenna. Array antennas are a common form of antenna found in modern radar and communication systems. In array antenna design, gain and size are important performance indicators. The larger the antenna size, the higher the antenna gain, but the larger the space required to install the antenna. Therefore, how to reduce the size of the array antenna while mainta...

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Problems solved by technology

Among them, the artificial periodic structure needs to occupy a large area of ​​the dielectric layer to form a complete bandgap structure to reduce the mutual coupling between the antennas, so the structure is complex, which increases the processing difficulty and processing cost; setting a cavity in the dielectric layer can reduce the equivalent of the dielectric Dielectric constant can improve the antenna gain, but the module with the cavity is fragile after processing, and it is difficult to test and apply; while the soft surface structure is small in size and simple in structure, and can be placed between the antenna elements without significantly increasing the array antenna The size is conducive to miniaturization design

For example, in 2017, IEEE Transactions on Antennas and Propagation published an article entitled "60-GHz LTCC Differential-Fed Patch Antenna Array With High Gain by Using Soft-Surface Structures" by Huayan Jin et al. The surface-structured patch array antenna uses a differential feed network to feed the patch antenna coaxially, and sets a parasitic patch above the patch antenna, and sets symmetrical rectangular metal strips on both sides of the antenna unit to suppress surface waves And to increase the gain of the array antenna, the size of the array antenna is 2.88λ×3λ×0.36λ, where λ is the wavelength in the air, and the gain of the array antenna reaches 19.2dBi, but the size of this bilaterally symmetrical soft surface structure is too large, resulting in sticking Chip array antennas are too large to meet miniaturization requirements

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