基于启发式模型的金属丝网覆盖孔的透射截面

R. Gunnarsson, M. Backstrom
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引用次数: 1

摘要

一个简单和低成本的解决方案,以保护位于一个封闭的孔后面的敏感设备,如通风或显示面板,是使用金属丝网覆盖的孔(s)。在高频率下,孔径传输系数接近于1,传输特性几乎完全取决于丝网特性。周期(无限)线网传输系数的解析模型可以很好地近似计算线网覆盖孔径的传输特性。然而,在较低的频率下,情况更为复杂,因为传输特性还取决于孔径的大小和形状。本文提出了丝网覆盖孔传输截面的解析模型。在低频,这是基于单线网单元的传输截面的组合,该截面使用磁极化率和从天线理论导出的功率关系来计算,该关系将通过一系列孔径传输的功率与通过单个孔径传输的功率联系起来。在中频,该模型假定通过数值模拟启发式地发现了频率依赖性。该模型在较宽的频率范围和线网格范围内提供了与数值结果非常吻合的结果。
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A heuristic model for the transmission cross section of wire-mesh covered apertures
A simple and low-cost solution for protecting sensitive equipment located behind an aperture in an enclosure, such as a ventilation or display panel, is to use a metallic wire-mesh to cover the aperture(s). At high frequencies, where the aperture transmission coefficient is close to one, the transmission properties depend almost exclusively on the wire-mesh properties. Analytic models for the transmission coefficient of periodic (infinite) wire-meshes can then be used to provide a good approximation of the transmission properties of the wire-mesh covered aperture. At lower frequencies, however, the situation is more complex, since the transmission properties depend also on the size and shape of the aperture. An analytic model for the transmission cross section of wire-mesh covered apertures is proposed in this paper. At low frequencies this is based on a combination of the transmission cross section of a single wire-mesh cell calculated using the magnetic polarizability and a power relation, derived from antenna theory, relating the power transmitted through an array of apertures to the power transmitted through a single aperture. At intermediate frequencies the model assumes a frequency dependence found heuristically through numerical simulations. The proposed model provides results in very good agreement with numerical results over a wide range of frequencies and wire-meshes.
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