Thin composite multiple-layer band gap microwave dark chamber wall body liner

Abstract

A thin composite multiple-layer band gap microwave dark chamber wall body liner is composed of microwave absorbing units arranged according to arrays. Each microwave absorbing unit comprises one layer or multiple layers of overlaid magnetic band gap structures, wherein a foam pointed cone is arranged on the magnetic band gap structure on an upmost layer and comprises a foam base arranged on the magnetic band gap structure on the upmost layer, and conical foam is arranged on the foam base. In the thin composite multiple-layer band gap microwave dark chamber wall body liner, a conical foam ring is arranged on the foam base, and the conical foam is arranged in the conical foam ring. The height of the conical foam is larger than that of the conical foam ring. The number of multiple layers of overlaid magnetic band gap structures is two to four. A simulation result shows that at least -15dB of reflection coefficient can be achieved in a range from 0.6GHz to 3GHz under the condition that the overall liner thickness does not exceed 5cm.

Description

technical field [0001] The invention relates to the field of microwave anechoic chambers, and relates to a thin composite multilayer bandgap microwave anechoic chamber wall lining. The lining combines conical foam materials with a lossy electromagnetic bandgap structure to obtain good broadband absorption characteristics and reduce Material thickness and weight, suitable for applications in compact space such as small microwave anechoic chambers. Background technique [0002] Microwave anechoic chamber is a room specially designed to reduce electromagnetic wave reflection and external interference. It can better simulate free space test conditions and is mainly used for microwave measurements such as antennas, radar and electromagnetic interference characteristics. The key to the design of the microwave anechoic chamber is the performance of the wall lining material. The lining materials used are usually divided into two types, conical foam and ferrite tiles. Cone-shaped fo...

AI Technical Summary

Problems solved by technology

Although these improvements have improved the performance of the lining material, they have not significantly reduced the volume and weight of the material, so they are only suitable for microwave anechoic chambers with large spaces.

This traditional microwave anechoic chamber has excellent performance and wide versatility, but the cost is very high

Images