Antenna housing based on wide-stop-band low-frequency multilayer frequency selective surface

Abstract

The invention discloses an antenna housing based on a wide-stop-band low-frequency multilayer frequency selective surface. An upper conductive layer is arranged on the upper surface of an upper-layerPCB; a middle conductive layer is arranged on the lower surface of the upper-layer PCB; a lower conductive layer is arranged on the lower surface of a lower-layer PCB; the upper conductive layer is composed of a plurality of upper interdigital structure units which are periodically arranged, the middle conductive layer is composed of a plurality of cross-shaped structure units which are periodically arranged, the lower conductive layer is composed of a plurality of lower interdigital structure units which are periodically arranged, and each upper interdigital structure unit corresponds to onecross-shaped structure unit and one lower interdigital structure unit; each of the upper interdigital structure unit and the lower interdigital structure unit is composed of two comb tooth structures,the lengths of outermost teeth of the two comb tooth structures are the same, the outermost teeth are oppositely distributed, and a gap is formed between the outermost teeth of the two comb tooth structures; each upper interdigital structure unit is completely aligned with the corresponding cross-shaped structure unit and the corresponding lower interdigital structure unit; and the antenna housing has relatively low 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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