Simple optimization method for EMI mesh pattern design

Abstract

Metallic mesh coatings are used on visible and infrared windows and domes widely to provide shielding from EMI (Electromagnetic Interference). In this paper, different EMI mesh geometries are compared with each other regarding various performance parameters. But to decide the best fitting EMI mesh geometry to particular optic system is a little bit complicated issue. Therefore, we try to find a simple optimization methodology to decide best EMI mesh geometry design that fits our particular high performance ISR (Intelligence, Surveillance and Reconnaissance) systems.

Frequency selective diffractive optical element (FSDOE)

“…The shielding effectiveness of an enclosure is a measure of how the incident wave is transmitted, and it is defined as the ratio of the incident wave ( ) is given with the following equation [1,2]…”

“…The shielding effectiveness will be square of the electric fields, and it can be defined in dB unit as follows [1,2]  …”

“…After the optimizations were completed to equalize the optical transmittance of two different geometries, the FSS structure with the same optical transmission was evaluated to compare the conventional FSS and circular symmetry accurately. Optical transmission [1] of the FSS structure is given as follows by using the geometry in Fig. 4.…”