Summary
International Symposium on Antennas and Propagation
2012
Session Number:4E3
Session:
Number:4E3-5
Bandwidth Enhancement and Size Reduction of Period for Dual-band Loop-slot Frequency Selective Surfaces on Plastic Board
Katsuyuki Tachikawa, Kunio Sakakibara, Kiyotaka Kumaki,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
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) is one of the solutions. FSS consists of arrangement of identical elements. Waves at some specific frequencies penetrate FSS. Using this property, FSSs are widely used for antenna's reflectors, radomes, and electromagnetic filters. Actually, the intended waves for car applications are not only one, for example, GPS, mobile phone, ETC and so on. Therefore, the bandwidth enhancement or multi-band FSS is required. 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. To yield dual-band property, two different elements are arranged in one period. In addition, close arrangement of inner elements yields broad bandwidth of higher resonance. Fractal path of loop slot in FSS achieves both double resonance and size reduction of the period. Polarization independent FSSs are developed by using vertically and horizontally symmetrical loop slot. To confirm simulation validity, measurement system is developed. Simulated and measured performances are presented in this paper.