Thermally tuned frequency selective surface based on BST film and processing technology

Abstract

The invention discloses a thermally tuned frequency selective surface based on a BST film and a processing technology. The frequency selective surface comprises a base layer, an intermediate dielectric layer and a frequency selective surface metal layer which are sequentially in close contact from bottom to top, wherein the frequency selective surface metal layer includes electrodes arranged at two sides and a plurality of FSS (Frequency Selective Surface) structural units arranged between the two electrodes, a micron-scale electric heating unit is further connected between the two electrodes,and the plurality of FSS structural units are arranged in the electric heating unit at equal intervals to form a periodic array. The invention has the significant effects that the temperature of theBST film is controlled through introducing a micron-scale electric heating wire according to the mechanism of thermal tuning, and the dielectric constant of the BST film is indirectly controlled through changing the current size, so that the transmission frequency of the BST film is enabled to be changed, and the dielectric tunabilty of the terahertz frequency band is realized.

Description

technical field [0001] The invention relates to the technical field of spatial filtering, in particular to a BST film-based thermally tuned frequency selective surface and its processing technology. Background technique [0002] Frequency Selective Surface (FSS) is a two-dimensional periodic array structure composed of periodically arranged metal patch units or periodically arranged opening units on a metal screen, which can make electromagnetic waves at the resonant frequency Total reflection or total transmission occurs, so it is a spatial filter that has a selective effect on the frequency of electromagnetic waves. Utilizing this characteristic of FSS, it can be applied to many fields such as aircraft RCS reduction, sub-reflector antenna, microwave communication and electromagnetic shielding. [0003] As a spatial filter, FSS has a wide range of applications in the microwave field. For example, FSS technology is used to prepare hybrid radomes, which can reduce the out-o...

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Problems solved by technology

[0004] But when the above products are prepared, the band-pass filtering characteristics realized by FSS cannot be changed.

For the hybrid radome, frequency conversion radar cannot be used due to its single-passband characteristics. If the frequency band of the enemy's detection radar is the same as that of the own guidance radar, the stealth function will be lost due to the inability to shield the electromagnetic waves in this frequency band; when the feed source of the Cassegrain system When the frequency changes, the dichroic sub-reflector cannot be dynamically adjusted according to the change of the feed frequency; and the traditional shielding room cannot select different passband ranges according to actual needs

These limitations make it difficult for FSS as a spatial filter to meet the actual needs in the application

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