Wideband Absorptive Frequency-Selective Reflector Based on Split-Ring
Resonator Embedded with Chip-Resistor
Abstract
A wideband absorptive frequency-selective reflector (AFSR) based on
split-ring resonator (SRR) embedded with chip-resistor is proposed in
this letter. A wide absorption band is achieved by the excitation of the
multimode resonance by two dipoles. The insertion of SSRs in the dipoles
is able to bypass the losses in the passband, thus allowing the
structure to open a wide window of transmittance in addition to
achieving broadband absorption performance. The upper structure consists
of a dipole in series with two SSRs, while the lower structure consists
of only one. The upper and lower structures are grouped together and
rotated by 90° around the Z-axis to form the final dual-polarization
3D-AFSR. The simulated results demonstrate that, reflection coefficients
below -10dB are seen between 6.74 ~ 9.31 GHz and 16.91
~ 19.61 GHz under normal incidence, with a total
fractional bandwidth of 46.8%. It also has a wide reflection band from
10.69 GHz to 15.44 GHz, and the entire profile is 0.17 λL, where λL is
lowest operating frequency.