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Low-frequency wave transmission and high-frequency broadband wave absorption frequency selection device

A wide-band, wave-transparent technology, applied in the direction of electrical components, antennas, etc., can solve the problems of narrow wave-absorbing bandwidth, bulky structure, difficult to fix, etc., achieve frequency dependence reduction, low-frequency wave-transparent, easy to install and fix Effect

Inactive Publication Date: 2019-06-21
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can realize the function of low-frequency wave transmission and high-frequency wave absorption by alternately stacking metal and dielectric layers, but its defects are that the wave-absorbing bandwidth is narrow, and the structure is bulky and thick
In addition, it is difficult to fix the layers of the structure, which is not conducive to practical application.

Method used

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  • Low-frequency wave transmission and high-frequency broadband wave absorption frequency selection device
  • Low-frequency wave transmission and high-frequency broadband wave absorption frequency selection device
  • Low-frequency wave transmission and high-frequency broadband wave absorption frequency selection device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] refer to figure 1 , a frequency selective device for low-frequency wave-transmitting and high-frequency broadband absorbing, comprising M×N frequency-selective surface units periodically arranged, the device selects M=26, N=17 to ensure the side length of the frequency-selective surface greater than the wavelength of the incident electromagnetic wave. In order to make the frequency selective units of the frequency selective surface closely connected, the period of the frequency selective surface is set as p. In order to control the size of the frequency selective surface unit, its side length should be controlled to be sub-wavelength, that is, the side length is smaller than the wavelength corresponding to the working frequency of the frequency selective surface, so the period of the selected frequency selective surface is p=11mm.

[0031] The frequency selective surface unit includes a square first dielectric plate 1 and a square second dielectric plate 2 stacked up a...

Embodiment 2

[0044] The structure of this embodiment is the same as that of Embodiment 1, only the sheet resistance value of the ITO film is modified, a=60ohm / sq.

Embodiment 3

[0046] The structure of this embodiment is the same as that of Embodiment 1, only the sheet resistance value of the ITO film is modified, a=120ohm / sq.

[0047] The working principle of the present invention is:

[0048] There are two reflection coefficients S on the frequency selective surface due to impedance matching 11 ≤-10dB, when the electromagnetic wave is incident, there will be almost no reflection into the frequency selective surface.

[0049] In the low frequency band, the ITO film does not oscillate, which is similar to an ideal electrical conductor, and the metal patch does not oscillate, so when the electromagnetic wave is incident from the upper surface of the frequency selective surface, except for a small part of the energy consumed by the ITO film, the dielectric plate and the gold patch , other energy passes through the frequency selective surface and propagates along the original propagation direction. This process is the forward wave transmission process o...

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Abstract

The invention provides a low-frequency wave transmission and high-frequency wave absorption frequency selection device. The device comprises MxN frequency selection surface units distributed periodically, wherein each frequency selection unit comprises a first square dielectric plate and a second square dielectric plate which are stacked up and down; 2x2 ITO thin films in the shape of a regular polygon or a regular polygon ring are pasted to the upper surface of each first dielectric plate, and the characteristic of high-band electromagnetic wave broadband absorption is realized by determiningthe size of each ITO thin film; and a metal patch is printed on the lower surface of each second dielectric plate, wherein a quasi-Jerusalem cross-shaped gap is etched on the metal patch, and the characteristic of low-band electromagnetic wave bidirectional transmission is realized by determining the size of the quasi-Jerusalem cross-shaped gap. The device has both the characteristic of low-bandbidirectional wave transmission and the characteristic of high-band wave absorption, the bandwidth of a wave absorption band is expanded, and the device can be applied to the field of wireless communication technologies.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a frequency selection device for low-frequency wave penetration and high-frequency broadband wave absorption. Background technique [0002] Metamaterials (MM) are synthetic macroscopic composite materials with periodic unit structures, which are designed to have certain physical properties that natural materials do not have. The research on metamaterials originated in the 1960s, and was selected by the "Science" magazine in 2010 as one of the 10 most important technologies for mankind in the past decade. So far, typical metamaterials include: left-handed materials, artificial magnetic conductors, frequency selective surfaces, etc. Among them, the frequency selective surface has been widely used as a "spatial filter" in radome, wave absorption and electromagnetic compatibility. With the development of detection radar, while ensuring normal communication between devi...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
Inventor 衣建甲林梦兰刘毅郭明涛刘晨晨李蝶
Owner XIDIAN UNIV
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