Low-band frequency selective surface with minimized cell sizes

A low-frequency, surface-selective technology, applied in electrical components, waveguide-type devices, circuits, etc., can solve the problems of large surface area, difficult installation, poor passband performance, etc., to achieve low resonant frequency and a wide range of applications.
CN102569953AActive Publication Date: 2012-07-11CHINA SHIP DEV & DESIGN CENT
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA SHIP DEV & DESIGN CENT
Publication Date
2012-07-11

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Abstract

The invention provides a low-band frequency selective surface with minimized cell sizes. The low-band frequency selective surface comprises a printed circuit board (PCB). An upper conductive layer is arranged on the front surface of the PCB, and a lower conductive layer is arranged on the back surface of the PCB. The upper conductive layer consists of upper periodical cells which are periodically arranged. The lower conductive layer consists of lower periodical cells which are periodically arranged. The upper and lower periodical cells are provided with vertically aligned conducting strips which are surface-surface coupled to form high distributed capacitance to reduce the resonance frequency of the frequency selective surface. The more than 20*20 upper periodical cells correspond to the lower periodical cells. According to the frequency selective surface, the vertically aligned conducting strips are arranged in the upper and lower conductive layers, and are surface-surface coupled to form the high distributed capacitance, so that the resonance frequency of the frequency selective surface is remarkably reduced. The frequency selective surface is insensitive to the polarization characteristics of electromagnetic waves, and the passband characteristics of different polarized electromagnetic waves (transverse electric (TE) waves and transverse magnetic (TM) waves) are substantially the same.
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Description

technical field

[0001] The invention belongs to the field of electromagnetic compatibility, and in particular relates to a low-frequency frequency selective surface with miniaturized unit size. Background technique

[0002] At present, for electronic equipment with a low working frequency band (300MHz~1GHz), it is difficult to develop a corresponding passband frequency selection surface radome, mainly for the following reasons: firstly, it can be known from the working principle of FSS that the unit perimeter It is approximately proportional to the free-space wavelength of the electromagnetic wave. The size of the periodic unit of the low resonant frequency FSS will be large. Taking the FSS with a resonant frequency of 300MHz as an example, the free-space wavelength of its electromagnetic wave is about 1000mm, and the variable length of the periodic unit is about 250mm, which is almost the same as the size of the equipment antenna. The frequency selective surface made by us...

Claims

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