Miniaturized Bandstop Frequency Selective Surface

Abstract

The invention discloses a miniaturized band-stop frequency selective surface. The band-stop frequency selective surface is composed of several identical unit structures arranged periodically in the horizontal two-dimensional direction of the dielectric substrate. The unit structure includes a pair of open metal rings on the upper surface of the dielectric substrate and a pair of openings on the lower surface of the dielectric substrate. Metal rings and metal through holes; the opening directions of the two metal rings forming a pair are opposite, and the two pairs of open metal rings on the upper and lower surfaces are perpendicular to each other in the direction of electromagnetic wave incidence, and the four metal through holes symmetrically distributed in the center of the unit respectively connect the four The open ends of the two metal rings correspond to the upper and lower connections. The inductance and capacitance resonance provided by the unit structure make the frequency selective surface of the present invention have band-stop characteristics, which can hinder the propagation of space electromagnetic waves in specific frequency bands; at the same time, the frequency selection surface also has a stable frequency response to different polarizations of space electromagnetic waves and different incident angles. and miniaturization features.

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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