Sharp Rejection and Wide Stopband Microstrip Lowpass Filters using Complementary Split Ring Resonators

Abstract

Abstract-

Grating Lobes Suppression in Frequency Selective Surfaces Using Electromagnetic Band Gap with Square Holes

“…Among some of these applications, antennas, filters, and frequency selective surfaces (FSS) can be mentioned. In some cases, these structures may present radiation of spurious modes [3], which can cause interference in antennas of other communication systems [4], or degrade the level of rejection above the passband, in the case of microstrip filters [5] and on frequency selective surfaces (FSS), spurious modes can significantly degrade the frequency response in the passband [6].…”

Application of electromagnetic bandgap in frequency selective surfaces for suppression of higher‐order modes

“…4 In the case of microtrip filters, spurious modes can degrade the rejection level above the passband. 5 In frequency selective surfaces (FSS), spurious modes can degrade the response in the passband. 6 In this context, periodic structures as electromagnetic bandgap (EBG) have been used to improve the performance of planar circuits and microstrip antennas, introducing rejection bands that prohibit the propagation of electromagnetic waves in the unwanted frequency bands.…”

“…In antennas, these spurious modes can cause interference with other communications systems 4 . In the case of microtrip filters, spurious modes can degrade the rejection level above the passband 5 . In frequency selective surfaces (FSS), spurious modes can degrade the response in the passband 6 …”