A Miniaturized and Polarization Insensitive FSS and CFSS for Dual Band WLAN Applications

Abstract

Abstract This article reports on a dual band, polarization insensitive Frequency Selective Surface (FSS) for Wi-Fi and WLAN shielding applications. The design incorporates concentric square and circular loops loaded with log periodic directors and passion crosses, respectively. The proposed design is completely polarization insensitive. Also, the design has angular stability up-to 45° for both Transverse Electric (TE) and Transverse Magnetic (TM) polarizations. The FSS offers measured suppression of 38\u202fdB at 2.4\u202fGHz and 32\u202fdB at 5.9\u202fGHz. The detailed analysis of all parameters has been carried out. Equivalent lumped circuit model has also been proposed. The design is highly miniaturized with the unit element size of 0.1λ0 only. The complementary bandpass FSS has also been investigated. The measured results are in good agreement with the simulated response. The design has excellent potential for EM field suppression and security applications.