A Frequency Selective Surface with Switching Properties and Design Method

Abstract

The invention discloses a frequency selective surface with switching characteristics and a design method. The method is as follows: step 1: according to the requirement of the working frequency band of the frequency selective surface, select a dielectric material with low loss and a suitable dielectric constant to design the shape of the dielectric resonator, Then, observe the electromagnetic wave propagation characteristics of the FSS formed by the dielectric resonator array through the electromagnetic field full-wave simulation software; step 2: invert the equivalent electromagnetic parameters of the frequency selection surface according to the S parameters obtained from the simulation, and judge the magnetic dipole, electric The spectral position of the dipole and four dipole moments; then fine-tune the size of the dielectric column to adjust the dipole resonance position, so that its band-stop frequency band meets the design requirements; Step 3: split all the dielectric columns of the frequency selective surface from the middle into Two layers, simulate and calculate the band-pass characteristics of its working frequency band, and determine the distance between the two layers of dielectric column arrays; Step 4: According to the results obtained in step 3, process and manufacture two layers of the same dielectric column array, and connect them with mechanical devices.

Description

Technical field [0001] The invention relates to an all-medium microwave and millimeter wave frequency selective surface with switching characteristics, which belongs to the field of photoelectric technology. Background technique [0002] The frequency selective surface (ie: Frequency Selective Surface—FSS) is usually a two-dimensional periodic structure with frequency selective characteristics, which is equivalent to a spatial filter, and is widely used in aircraft radomes to reduce the radar cross section (RCS). Communication and electromagnetic protection also play an important role. [0003] The traditional frequency selection surface is generally composed of periodically arranged metal patch units or periodically arranged opening units on a conductive metal screen. This surface structure uses the resonance of the metal structure to achieve total reflection (band stop FSS) or Full transmission (bandpass type FSS) characteristics. Its disadvantages are: the working frequency ba...

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Problems solved by technology

Its disadvantages are: the working frequency band is narrow (if you want to obtain a wide frequency band, you need to arrange a variety of unit structures with resonance characteristics, and the design is quite complicated), and the metal part is prone to arcing under the irradiation of high-power electromagnetic waves, and the metal part is easy to corrode

[0005] The existing frequency selective surface is to print various metal structures on the dielectric substrate, or periodically arrange the openings on the conductive metal screen. The main working mechanism is electromagnetic resonance, so its working bandwidth is narrow and the design is complicated; while the metal layer It is easy to generate arcs under the irradiation of high-power electromagnetic waves, and the ohmic loss generated by large currents will cause temperature rise; when working with high-frequency electromagnetic waves, its surface wave loss will increase; the metal layer is also easy to corrode in harsh working environments

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