Low-frequency ultra-wideband wave absorber based on magnetic material and lumped device

Abstract

The present invention provides a structure unit, which is of a square structure and comprises a cross-shaped metal patch (2), a dielectric substrate (1), a metal floor (3) and a lumped resistor (4) onthe same layer as the cross-shaped metal patch (2) from top to bottom. The dielectric substrate (1) is a square sheet; the cross-shaped metal patch (2) is attached to the upper surface of the dielectric substrate (1), and two gaps are etched in each of the horizontal branch knot and the vertical branch knot; a lumped resistor (4) is loaded on the gap; and the metal floor (3) completely covers thebottom surface of the dielectric substrate (1). The invention further provides a low-frequency ultra-wideband wave absorber based on the magnetic material and the lumped device, the low-frequency ultra-wideband wave absorber is composed of the structural units and is a linear array or an area array, the larger the number of the structural units in the array is, the better the wave absorbing effect is, and the wave absorbing effect of the area array is remarkably superior to that of the linear array. More than 85% of wave absorbing effect within the frequency band of 0.23 GHz-1. 0GHz is achieved through adoption of a method of combining the magnetic material and the lumped resistor, the problems of narrow P-band wave absorbing bandwidth and unsatisfactory wave absorbing effect are solved,and the ultra-thin P-band wave absorbing material has the advantages of being simple in structure, ultra-thin and miniaturized.

Description

technical field [0001] The invention relates to a broadband absorber, in particular to a low-frequency ultra-broadband absorber based on magnetic materials and lumped devices. Background technique [0002] Metamaterial absorber is a structural artificial electromagnetic material, which utilizes the ohmic loss and dielectric loss of the unit structure to achieve strong absorption of electromagnetic waves, and can reach nearly 100% absorption rate, which has broad application prospects in the field of stealth. But its limitation is that the absorption bandwidth is narrow, and it is difficult to achieve low frequency operation. With the development of advanced low-frequency radar, the absorber needs to have good absorbing performance in the P-band, and most of the existing absorbers work in the L-X band, and there are few researches on the absorber for the P-band . Although the operating frequency of the absorber can be appropriately reduced by increasing the size and thickne...

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Problems solved by technology

[0003] In order to solve the problems of large size, narrow bandwidth and unsatisfactory absorbing effect when the traditional absorber works in the P-band, the present invention proposes a structural unit, which is hereinafter referred to as "unit", which is characterized in that the unit is a square structure. From top to bottom, it includes a cross-shaped metal patch 2, a dielectric substrate 1, a metal floor 3, and also includes a lumped resistor 4 on the same layer as the cross-shaped metal patch 2;

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