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Frequency selective absorbing body for intermediate frequency broadband wave transmission and high frequency and low frequency wave absorbing

A frequency-selective and wave-absorbing body technology, applied in the field of frequency-selective wave-absorbing bodies, can solve the problems of large transmission insertion loss, difficult processing, and high production cost, and achieve wide transmission frequency bandwidth, small transmission insertion loss, and simple structure. Effect

Active Publication Date: 2019-09-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

[0004] However, at present, the existing planar frequency selective absorbers have a relatively narrow IF transmission frequency bandwidth, large transmission insertion loss, and narrow application prospects.
In order to solve the problem of narrow transmission frequency bandwidth, the traditional method is to use the combination of the transmission channel and the absorbing channel to build a three-dimensional broadband absorbing frequency selection structure, but the structure is complex, the processing is difficult, the production cost is high, and it is often a single Polarization sensitive

Method used

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  • Frequency selective absorbing body for intermediate frequency broadband wave transmission and high frequency and low frequency wave absorbing
  • Frequency selective absorbing body for intermediate frequency broadband wave transmission and high frequency and low frequency wave absorbing
  • Frequency selective absorbing body for intermediate frequency broadband wave transmission and high frequency and low frequency wave absorbing

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Embodiment 1

[0023] In this embodiment, the period of the frequency selective absorber unit is 15 mm, the thickness of the air layer 3 is 6.3 mm, and the overall thickness of the frequency selective absorber unit is 12.5 mm. The first dielectric layer 2 is made of RO4350B sheet material with a relative permittivity of 3.48 and a loss tangent of 0.0037, with a thickness of 0.2 mm. The 12 cochin units 11 have the same structure and all resonate at 10GHz. The lumped resistor 12 is a chip resistor packaged in 0201 with a resistance value of 130 ohms. The second dielectric layer 5 and the third dielectric layer 7 are F4B plates with a dielectric constant of 2.2 and a thickness of 3 mm. The side lengths of the second metal layer 4 and the fourth metal layer 8 are 7.5 mm. The square ring 62 has a side length of 6.3 mm and a width of 0.15 mm. All metal layers are made of copper with a thickness of 0.035mm.

[0024] Figure 6 It is the simulation curve of the absorption rate, reflection coeffi...

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Abstract

The invention discloses a frequency selective absorbing body for intermediate frequency broadband wave transmission and high frequency and low frequency wave absorbing. The body includes a periodically selected frequency selective wave absorbing unit, wherein the frequency selective wave absorbing unit includes a first metal layer, a first dielectric layer, an air layer, a second metal layer, a second dielectric layer, a third metal layer, a third dielectric layer and a fourth metal layer which are sequentially disposed, the first metal layer includes four sets of cross-toe structures surrounding a square, a set of cross-toe structures are on one side of the square, the adjacent sets of cross-toe structures are connected by a lumped resistor, each set of cross-toe structures includes three cross-toe units, and two adjacent toe units in each set of cross-toe structures are connected by metal lines. The body is advantaged in that the structure is simple, processing is easy, cost is low, and wider transmission frequency band width and smaller transmission insertion loss can be obtained.

Description

technical field [0001] The invention relates to a frequency selective wave absorber, in particular to a frequency selective wave absorber for medium frequency broadband wave penetration, high frequency and low frequency wave absorption. Background technique [0002] In modern warfare, radar technology is the most important means of detection, and it is widely used in aircraft, missiles, navigation and other fields, and the application of radomes is also becoming more and more extensive. The radome radome can not only protect the antenna from interference from rain, snow, strong wind, dust and other external environments, but also has a certain frequency selection function, which can reduce the interference of surrounding reflection antennas. [0003] According to the radar action equation, the maximum detection range of the radar in free space is proportional to the fourth root of the radar cross section (Radar Cross Section, RCS) of the target. Every 10dB reduction in RCS c...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0026H01Q15/0086H01Q17/008
Inventor 王玲玲刘少斌孔祥鲲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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