Miniaturization band elimination type frequency selective surface

Abstract

The invention discloses a miniaturization band elimination type frequency selective surface. The miniaturization band elimination type frequency selective surface is formed by periodically arranging a plurality of same unit structures on a dielectric substrate in the horizontal two-dimensional direction, and each unit structure comprises a pair of opened metal rings located on the upper surface of the dielectric substrate, a pair of opened metal rings located on the lower surface of the dielectric substrate and metal through holes; the opening directions of the two metal rings in each pair are opposite, the two pairs of opened metal rings on the upper surface and the lower surface are perpendicularly staggered in the electromagnetic wave incidence direction, and the four metal through holes symmetrically formed in each unit center are used for correspondingly connecting the opening ends of the four metal rings in an up and down mode. The frequency selective surface has the band elimination characteristic due to inductance and capacitance resonance provided by the unit structures, and propagation of electromagnetic waves within specific frequency bands can be blocked; meanwhile, the frequency selective surface further has the advantages of being stable in response to different-polarization and different-incidence-angle frequencies of the space electromagnetic waves and being miniaturized.

Description

technical field [0001] The invention belongs to the field of electromagnetic field and microwave technology. In particular, it relates to a band-stop type frequency selective surface with unit size miniaturization. Background technique [0002] Frequency Selective Surface (FSS) is a two-dimensional periodic structure composed of periodic arrangements of resonant units. Frequency selective surfaces have been widely studied and applied in military and civilian fields such as spatial filters, radomes, antenna reflectors, and absorbing materials. However, when the frequency selective surface is applied in the above fields, it faces a prominent problem, that is, when the frequency selective surface is used in a limited area, if the unit size of the frequency selective surface is relatively large, the number of units in the limited area will be relatively small , will affect the relative performance of the frequency selective surface, for example: the low sensitivity of the freq...

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Problems solved by technology

In view of this, the current miniaturization technology of most frequency selective surfaces is mainly realized by using metal wires, gaps in meandering units or using external lumped capacitance and inductance elements; the design of the former frequency selective surface unit structure is very complicated, while the latter integrates The electrical parameters of the total components will be affected by ambient temperature, humidity and even strong electromagnetic fields; in addition, a so-called three-dimensional frequency selective surface has been proposed. This kind of three-dimensional frequency selective surface is mostly based on multi-layer dielectric substrates, which is difficult to manufacture , the cost is high; therefore, it is necessary to further design a new type of frequency selective surface miniaturized unit structure

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