Multitasking Device Regulated by the Gravity Field: Broadband Anapole-Excited Absorber and Linear Polarization Converter

In this paper, an innovative multitasking device (MTD) regulated by the gravity field realizing the functions of metamaterial absorber (MMA) and linear polarization converter (LPC) is proposed and theoretically investigated. When the device operates in the function of MMA, the engineered SRR structure offers robust conditions for the formation of anapole mode. The anapole mode can lead to destructive interference in the far-field and constructive interference within the configuration synchronously; thereby, the incident wave energy can be consumed strongly. It is verified that the proposed MTD in the MMA state can acquire a high absorption rate exceeding 0.9 from 10.82 to 13.55 GHz, with a broad relative bandwidth (RBW) of 22.4%. While in the LPC state, the utilization of the L-shaped structure successfully introduces an equivalent magnetic resonance to achieve the translation of the incident wave polarization state. In this case, the orthogonal state of the incident beam can be obtained by the MTD with the polarization conversion ratio (PCR) over 0.9 in the range of 2.62-3.72 GHz, whose RBW is 34.7%. The design accomplishes the functional combination of MMA and LPC through the gravity field regulation, simultaneously staggering the operating bands to guarantee their independence and anti-interference.

Automated summary

In this paper, an innovative multitasking device regulated by the gravity field is proposed, which can perform the functions of metamaterial absorber and linear polarization converter. The device achieves high absorption rate and wide bandwidth in the absorber state, and it can realize polarization conversion of the incident beam in the converter state through gravity field regulation.