A Compact Frequency Selective Surface With Stable Response for WLAN Applications

Design of a Compact Passband Frequency Selective Surface with Stable Resonance

“…This may be due to strong surface impedance dependence at oblique incidence on the plane and polarization. However, it can also be found that the shifts of the frequency response with the change O p e r a t i n g b a n d Dual [6] 2.208 0 × 2.208 0 3.4, 0.5 mm Single Dual [7] 0.104 0 × 0.104 0 4.4, 1.6 mm Single Dual [8] 0.081 0 × 0.081 0 2.65, 1.5 mm Single Dual [9] 0.062 0 × 0.062 0 3.66, 0.254 mm Single Single [10] 0.172 0 × 0.172 0 4.3, 1.6 mm Single Single [11] 0.095 0 × 0.095 0 4.3, 1.6 mm Single Dual [12] 0.061 0 × 0.061 0 2.65, 1 mm Dual Single [13] 0.088 0 × 0.088 0 4.3, 1.6 mm Dual Single [14] 0 of the incident angle are opposite for transverse magnetic (TM) and transverse electric (TE) incidences. It is further observed from Figure 2 that the variation in the amplitude levels (i.e., the resonance bandwidth) in TM mode increases with increase in the angle of incidence, whereas in TE mode, it is falling rapidly as the angle of incidence increases.…”

“…These parameters normally control the overall frequency response of the structure, such as its resonance frequency, bandwidth, and dependence on the polarization and incidence angle. In recent years, several structures have been proposed to miniaturize the FSS [6][7][8][9][10][11][12][13][14]. Metallic patches and wire mesh separated by thin airgaps constituting an FSS [6] have been proposed at X-band.…”

“…A better reduction of other novel unit cells has been also proposed by adding another layer on the other side of octagonal FSS [8] and the metallic line between square patches [9]. Other novel FSS patterns have been proposed for the single band [10,11] as well as dual-band [12][13][14], applications with stable resonance frequency at the different incident angles.…”

Double square loop FSS with slots for closer band spacing at oblique incidence

“…There is a large volume of published studies describing techniques to optimize FSS geometry to ensure that the structure is capable to provide multi resonance behavior with a higher packing density without compromising the angular stability [4]. There are various compact structures that were proposed in literature either as a bandstop or bandpass filter [5]- [7]. In this paper, a nested double square loop FSS is proposed with dual-band stop behavior.…”

A Novel Simple Convoluted Geometry to Design Frequency Selective Surfaces for Applications at ISM and UNII Bands

“…In [10], the authors showed a project of cascading FSS to block the second and third ISM bands and UNII band. In [11], the authors proposed a compact FSS to reject 5 GHz band with angular stability for TE and TM modes of polarization. None of those projects blocked all ISM bands and UNII bands with angular stability and independence of polarization.…”