Design of an adjustable polarization-independent and wideband electromagnetic absorber

Abstract

An adjustable polarization-independent electromagnetic absorber based on a frequency-selective surface is proposed for both C and X microwave-band applications. The design using a symmetric fan-shaped pattern significantly reduces the sensitivity to different polarizations of normal incident microwaves. To achieve adjustability, PIN diodes are connected between patterned unit cells. By incorporating inductors into the metal patterns, an S-shaped series bias provides the bias voltage to PIN diodes. By tuning the working states of the diodes, an adjustable absorption performance from 4.6 to 13 GHz is achieved for both transverse electric and transverse magnetic polarizations in normal incidence.

UHF Metamaterial Absorber with Small-Size Unit Cell by Combining Fractal and Coupling Lines

“…The use of an air layer greatly reduces the weight of the entire absorber. In the microwave anechoic chamber, a pair of double-ridge broadband horn antennas (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) connected to a vector network analyzer (PNA-XN5244A) is used to measure the reflectivity of the proposed absorber. To ensure the remote field conditions, the distance between the absorber International Journal of Antennas and Propagation and antennas is set as 2 meters.…”

“…The incident electromagnetic wave can be absorbed almost 100 percent by the rational design unit cell and dielectric materials. To date, much work has been made on absorbers to achieve multiband absorption and broadband absorption due to its important applications in microwave, terahertz, and optical frequency [6][7][8][9][10][11][12][13][14][15]. A dual-band polarization-independent metamaterial absorber has been designed using a fractal square loop.…”

The quest for perfect electromagnetic absorber: a review

“…He et al proposed an adjustable PIA based on an FSS for both C and X band applications [96]. The design using a symmetrical fan-shaped pattern significantly reduces the sensitivity to different polarizations of normally incident EM waves.…”

A wideband switchable absorber/reflector based on active frequency selective surface

“…[10][11][12][13] In recent years, more attention has been focused on the switchable absorber/reflector. [14][15][16][17][18][19][20][21][22][23][24][25][26] In order to avoid radar detection in complex electromagnetic environment, it is necessary to use absorbing materials. However, since the absorber only absorbs all the incident electromagnetic waves, it will cause the problem of blocking the useful signals at the same time.…”