Dual‐polarized frequency‐selective absorber with wide transmission band

Abstract

A dual‐polarized frequency‐selective absorber (FSA) with wide transmission band is proposed and designed. First, a three‐layered antenna‐filter‐antenna structure is designed to construct a wide passband. Then, a lossy resonator is introduced to achieve the absorption properties. Therefore, the resultant FSA can achieve one wide passband in higher frequencies and one absorptive band at lower frequencies, and thus can be applied as a radome of an antenna system. In the transmission band (3.51‐5.33 GHz), the signal can transmit through the absorber. Meanwhile, in the absorption band (1.67‐3.10 GHz), the coming wave is absorbed to reduce the radar cross section of the antenna. The total thickness of the FSA is less than 0.1λ L at the lowest operating frequency.

Low profile polarization‐insensitive wideband rasorber with in‐band transmission

“…1 These can also be termed absorbers with a transmission band. 2,3 These are used in radome structures and hence these are termed as rasorbers (Radome and absorbers) or FSR. 4,5 Radomes are structures commonly used on military aircraft and ships to protect against electromagnetic interference (EMI) and to provide stealth technology.…”

“…They can also be used in civilian applications, such as cars and boats, to reduce the risk of accidents caused by collisions with other objects 1 . These can also be termed absorbers with a transmission band 2,3 . These are used in radome structures and hence these are termed as rasorbers (Radome and absorbers) or FSR 4,5 .…”

Polarization‐insensitive frequency selective rasorber with broad absorption band and two‐sided transmission bands

“…11,12 In order to overcome the communication limitation of FSS based absorbers, frequency selective rasorbers (FSRs) with dual characteristics of absorption and transmission have gained much popularity in the recent years. [13][14][15][16][17][18][19] The FSR are generally obtained by integrating the bandpass application of FSS with the absorbers, where the ground layer of the absorber is replaced with a bandpass FSS such that both the transmission and absorbance characteristics are retained. Moreover, the FSR structures are also used to achieve low out-of-band radar cross section.…”

A wideband multilayer tunable filter using active frequency selective surface

“…1,2 FSS research covers microwave, infrared, visible light, and other electromagnetic wave bands. With the bandpass or bandstop characteristics, it is widely used in many fields, such as filters, 3,4 absorbers, 5 and antennas. 6 With the rapid development of wireless communication technology, reconfigurable FSS has become a research hotspot in recent years.…”