A Broadband Wave-transmitting Frequency Selective Absorber Based on 2.5d Structure
A frequency-selective and wave-absorbing technology, applied in the field of artificial metamaterials, can solve the problems of sensitive incoming wave polarization, narrow wave-transmitting bandwidth of wave absorbers, and difficult 3D structure processing, so as to improve angular stability and reliability. Integration, widening -1dB transmission bandwidth, avoiding the effect of angle-sensitive characteristics
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Embodiment 1
[0028] Low scattering characteristics are an essential feature of advanced weapons and equipment. With the wide application of radar detection technology and multi-station radar, conventional stealth radome can only reduce the single-station RCS and cannot meet the stealth requirements of weapons and equipment. However, conventional absorbers do not have selectivity in the frequency domain, which seriously affects the working requirements of the antenna system for transmitting and receiving electromagnetic waves. Therefore, frequency-selective absorbers with frequency-selective characteristics have become a research hotspot in the field of stealth. However, in the prior art, the high-transmission bandwidth of the frequency-selective absorber is often narrow, which is contrary to the development trend of the broadband work of the airborne radar antenna system. Therefore, there are objective applications for the frequency-selective absorber with wide wave-transmission characterist...
Embodiment 2
[0034] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly.
[0035] The thickness of the lossy layer dielectric plate in the present invention is hd1, 0.25mm≤hd1≤2mm. The dielectric constant is j, 1.5≤j≤4.5. In this exa...
Embodiment 3
[0037] The overall composition of the broadband wave-transparent frequency-selective absorber based on the 2.5D structure is the same as in Embodiment 1. In the present invention, the side length of the dielectric plate of the loss layer is a, 5mm≤a≤10mm, and the size of the dielectric plate is related to the wave-transparent work of the resonator. Frequency is related, the operating frequency of the resonator (that is, the center frequency of the wave-transmitting band of the present invention) is related to the 2.5D bent metal strip structure formed by bending the double-sided rounded metal patch along a right-angle path, when the length and width of the dielectric plate change , the 2.5D bent metal strip structure formed by bending the bilateral rounded metal patch along the right angle can also change accordingly. In this example, side length a=10mm, thickness hd1=2mm, j=4.5.
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