A radome based on wide stopband low frequency multilayer frequency selective surface

Abstract

The invention discloses a radome based on a wide-stop-band low-frequency multi-layer frequency selective surface. The upper surface of the upper PCB board is provided with an upper conductive layer, the lower surface of the upper PCB board is provided with a middle conductive layer, and the lower surface of the lower PCB board A lower conductive layer is provided, the upper conductive layer is composed of several upper interdigital structural units periodically arranged, the middle conductive layer is composed of several cross-shaped structural units periodically arranged, and the lower conductive layer is composed of several lower interdigital structural units periodically arranged. Composed of interdigital structural units, wherein an upper interdigital structural unit corresponds to a cross-shaped structural unit and a lower interdigital structural unit; the upper interdigital structural unit and the lower interdigital structural unit are composed of two comb structures, Among them, the lengths of the outermost teeth of the two comb structures are the same, relatively distributed, and there is a gap between them; each upper interdigital structural unit is completely aligned with the corresponding cross-shaped structural unit and lower interdigital structural unit; the radome has lower resonant frequency.

Description

technical field [0001] The invention belongs to the field of electromagnetic engineering and relates to a radome based on a wide stop band low frequency multilayer frequency selective surface. Background technique [0002] At present, for low-frequency (400MHz-3GHz) mobile communication, electronic countermeasures, radar and other electronic equipment, the frequency selection surface radome has narrow bandwidth, narrow stop band, high frequency, harmonics are closer to the fundamental frequency, and the unit is smaller. Large and other problems, there is a greater difficulty in development. The reason is that the sub-wavelength of the low-frequency unit is longer than that of the high-frequency sub-wavelength unit; the structural size of the frequency selective surface unit is much larger when working at low frequencies; the radome often uses many units to simulate infinite periodic structures, which will As a result, the size of the entire radome is too large, resulting in...

AI Technical Summary

Problems solved by technology

Since the inductively loaded frequency selective surface adopts a single-layer design, it cannot achieve multi-frequency point resonance in the band, resulting in a narrow resonance bandwidth of the frequency selective surface, which cannot transmit broadband signals; due to inductive loading, the harmonics are closer to the fundamental frequency of the resonance, which cannot be realized Wide stopband performance

Capacitor-loaded multilayer frequency selective surface can achieve broadband, but due to the discrete type of capacitance, the error of patching and the effectiveness of capacitance, the performance of the frequency selective surface is far from the expected; and its processing and welding lead to frequency Increased cost of selecting surfaces

In addition, lumped inductors and capacitors will fail at high temperatures, so they are not suitable for radomes of various electronic devices

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