A frequency-selective surface structure with large bandwidth and small size periodic elements

Abstract

A frequency selective surface structure of large bandwidth and small size periodic unit, which comprises a first base material and a second base material, the front surface of the first base material is provided with an upper conductive layer, and the first base material and the second base material are provided with The middle conductive layer, the reverse side of the second base material is provided with a lower conductive layer, the upper conductive layer, the middle conductive layer and the lower conductive layer are respectively composed of the upper periodic unit, the middle periodic unit and the lower periodic unit. The broken line on the side and the upper first conductive metal sheet and the upper second conductive metal sheet on the right side are composed of the middle period unit is composed of the middle conductive metal sheet, and the lower period unit is composed of a series of parallel conductive metal wires in the lower layer. Identical and stacked on top of each other, edge-aligned. The frequency selective surface of the present invention uses the surface-to-surface coupling between the conductive metal sheets to increase the distributed capacitance and reduce the relative size; the broken line increases the distributed inductance and increases the relative passband bandwidth; the lower parallel conductive metal lines increase the frequency selective surface crossing Polarization isolation.

Description

technical field [0001] The invention belongs to the field of frequency selective surface design, and in particular relates to a frequency selective surface structure of a period unit with a large bandwidth and small size. Background technique [0002] Frequency selective surface has gradually become a research hotspot due to its application value in antenna, microwave and other fields. Frequency selective surfaces are composed of one-dimensional or two-dimensional periodic structures whose transmission coefficients behave as spatially structured filters. The miniaturization of the periodic unit size (expressed as the relative size of unit side length and resonant frequency wavelength) of frequency selective surface is a very important research direction of frequency selective surface. The smaller the element size, the weaker the grating lobe characteristics of the frequency selective surface, and the transmission coefficient will be about stable under the condition of large...

AI Technical Summary

Problems solved by technology

Although the above method can significantly reduce the cell size, due to the relative bandwidth of the frequency selective surface When C increases significantly, the relative bandwidth will gradually decrease

Therefore, the above cell size miniaturization techniques are of limited use in the design of large relative bandwidth frequency selective surfaces without loading with lumped inductive elements

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