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.
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
Image
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] Miniaturized unit size The low-frequency frequency selection surface includes a PCB board, the thickness of the PCB board is 0.5-2 mm, and the dielectric constant is less than 10. The front side of the PCB board is provided with an upper conductive layer, and the back side is provided with a lower conductive layer; the upper conductive layer is formed by periodic arrangement of upper period units, and the lower conductive layer is formed by periodical arrangement of lower period units. The number of units in the previous cycle is greater than 20*20, and the units in the next cycle correspond to the units in the previous cycle.
[0023] figure 1 It is a schematic diagram of the upper cycle unit. The upper cycle unit includes a copper foil box 2 and four square conductive sheets 1 surrounded by a square shape in the frame. There are fine wires between adjacent conductive sheets and between the conductive sheet and the copper foil box. Seam 3; a lumped parameter inductanc...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
11 Jul 2012
Publication
CN102569953A
- IPC
- H01P1/20
- Inventors
- ιε³°; ε΄ζε