A tunable miniaturized-element frequency selective surfaces without bias network

Switchable electromagnetic shield by active frequency selective surface for LTE‐2.1 GHz

“…Frequency selective surface (FSS) is a kind of spatial filter constituted by periodic metallic patch or aperture to transmit desired and reflect undesired signals, which widely used in many fields like antenna reflectors, absorbers, hybrid radomes, electromagnetic shield, and so on . A passive FSS has some limits and shortcomings because it offers no flexibility once fabricated, whereas an active FSS (AFSS) allows the potential for some elements of control by changing the behavior of the surface .…”

A Dual-Polarized Switchable Active Frequency Selective Surface for Lte-D Band

“…Over past years, FSSs have been extensively used in a variety of applications such as designing stealth radomes for aircrafts, dichroic reflector antennas, EM shielding for EMC and RCS reduction by EM absorbers to name a few [2]. A passive FSS has some limits because it offers no flexibility once fabricated, whereas an Active FSS (AFSS) allows the potentiality of control by changing the behavior of the surface [3][4][5][6][7][8][9][10][11][12][13][14]. As far as we know, the reconfigurable AFSSs can be divided into two main categories.…”

“…As far as we know, the reconfigurable AFSSs can be divided into two main categories. One is switchable AFSSs which can switch frequency response between transmission and reflection at a specific frequency [3][4][5][6][7][8], and the other is tunable AFSSs whose frequency response can be shifted and tuned within a certain range [9][10][11][12][13][14]. The square-loop switchable AFSSs were realized by loading PINs inside elements or adjacent space, which were the first proposed AFSS as far as we know [3,4].…”

“…To achieve polarization-independent performance, a new back provefed method through vias inside substrate was invented, which still needs a biasing network in bottom layer and not easy to be manufactured [5,6]. Moreover, some scholars combined the structures and feeder lines together and adopted reasonable topology to avoid extra biasing network for easy design and better performance [7,8,[11][12][13][14]. In [7], the popular ring element FSS was used to realize good performance in terms of all polarization affected and good angular stability by PINs and inductors.…”

Analysis of on-Body Transponders Based on Frequency Selective Surfaces

“…This filter property has been exploited in several applications [13]. In [14] the bandpass frequency can be modified using tuning devices such as varactors or PIN diodes. In previous works, the authors demonstrate the use of a transponder based on an FSS to reduce the interference from clutter reflections by changing its radar cross section (RCS) using the classic backscattering technique for RFID applications.…”