Bandwidth enhancement and size reduction of period for dual-band loop-slot Frequency Selective Surfaces on plastic board

摘要

To reduce cars' weight, plastic materials are being used in bodies and windows of cars. Electromagnetic shielding capability in plastic is much less than metal and glass. Therefore, electromagnetic interferences between devices of car equipments are concerned in the replacement from metal and glass to plastic of car body and windows. To solve this problem, a Frequency Selective Surface (FSS) [1] is one of the solutions. FSS consists of arrangement of identical elements. Only the waves at some specific frequencies penetrate FSS, as shown in Fig. 1. Using this property, FSSs are widely used for antenna's reflectors, radomes, and electromagnetic filters [1], [2]. Actually, the intended waves for car applications are not only one, for example, GPS, mobile phone, ETC and so on are used, simultaneously. Therefore, the bandwidth enhancement or multi-band FSS is required [3]. Furthermore, as only the limited area is often allowed to mount FSS, the size of the period is designed to be small to obtain periodic property.