A frequency selective absorber for medium frequency broadband wave transmission, high frequency and low frequency absorption

A technology of frequency selection and absorber, applied in the direction of antennas, electrical components, etc., can solve the problems of large transmission insertion loss, difficult processing, high production cost, etc., and achieve wide transmission frequency bandwidth, small transmission insertion loss, and simple structure Effect

Active Publication Date: 2021-02-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • 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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  • A frequency selective absorber for medium frequency broadband wave transmission, high frequency and low frequency absorption
  • A frequency selective absorber for medium frequency broadband wave transmission, high frequency and low frequency absorption
  • A frequency selective absorber for medium frequency broadband wave transmission, high frequency and low frequency absorption

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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 6.3mm and a width of 0.15mm. 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 coeffici...

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PUM

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Abstract

The invention discloses a frequency selective absorber for medium-frequency broadband wave penetration and high-frequency and low-frequency absorbing, which includes periodically arranged frequency-selective absorber units, and the frequency-selective absorber units include sequentially arranged first metal layers , the first dielectric layer, the air layer, the second metal layer, the second dielectric layer, the third metal layer, the third dielectric layer, and the fourth metal layer; wherein, the first metal layer includes four groups of interdigitated structures that form a square , there is a group of cochin structures on one side of the square, and the adjacent two groups of cochin structures are connected by lumped resistance, each group of cochin structures includes three cochin units, and the adjacent two cochin units in each group The lines are connected. The invention has simple structure, easy processing and low cost, and can obtain wider transmission frequency bandwidth and smaller transmission insertion loss.

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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Patent Type & Authority Patents(China)
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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