Large-angle stable miniaturized frequency selective surface

Abstract

The invention relates to a miniaturized frequency selective surface, and belongs to the field of radar antennas. The frequency selective surface is formed by arranging a plurality of S*T same units inan equal-period mode, wherein each unit is composed of a dielectric plate in a regular hexagonal prism shape, two layers of metals printed on the upper surface and the lower surface of the dielectricplate and a metal via hole set vertically penetrating through the dielectric plate, the two layers of metals on the upper surface and the lower surface of the dielectric plate are respectively composed of three metal strip lines which are in rotational symmetry, each metal strip line is bent into an arrow shape, and the upper metal strip line and the lower metal strip line are connected through ametal via hole which vertically penetrates through the dielectric plate to form a 2.5 D frequency selection unit structure. The frequency selective surface designed by the invention has a good miniaturization characteristic, can still keep the band elimination performance in a stable frequency band when different polarized electromagnetic waves are incident at a large angle, and is suitable for the fields of wireless communication and radar.

Description

technical field [0001] The invention belongs to the field of radar antennas. Background technique [0002] Frequency Selective Surface (FSS) usually refers to a planar structure formed by periodic arrangement of basic units. Theoretically, FSS is a two-dimensional structure that extends infinitely. However, in practical applications, there must be restrictions on the size of the structure. To arrange enough units on the same area of ​​the plane, it is necessary to reduce the size of each unit. Size, so that the characteristics of the entire plane are closer to the characteristics of infinite period, that is, to reduce the energy loss caused by edge diffraction, grating lobes and mode interaction zeros, etc., and to improve the filtering performance of the frequency selective surface. In addition, the miniaturization of FSS can reduce the center frequency, improve the polarization and angle stability of electromagnetic wave propagation, and expand the application range of FS...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of insufficient miniaturization and poor stability at large angles caused by the limited single-layer planar design of the frequency selective surface, the present invention designs a more compact planar symmetric structure, and breaks through the limitation of the planar space to improve the miniaturization of the frequency selective surface and stable performance at large angles

Images