Spurious mode suppressing technique for performance enhancement of hybrid planar/NRD-guide circuits

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

“…Microstrip planar structures have been used in several applications, in wireless communication systems, due to the low cost of manufacture, reduced weight, and dimensions and ease in their manufacture on a large scale. 1,2 However, these structures may have some limitations, such as radiation of spurious modes. 3 In antennas, these spurious modes can cause interference with other communications systems.…”