Ultra-thin, polarization-insensitive, deca-band metasurface absorber based on a plus-shaped resonator with concentric circular arc elements

This article presents an ultra-thin, polarization-insensitive, and high-performance deca-band metasurface ab sorber designed on a low-cost FR-4 substrate. The proposed structure consists of unit cells with dimensions of 20 & times; 20 & times; 1 mm3. When the free-space wavelength (lambda o) at the lowest operating frequency of 3.8 GHz is considered, the unit cell periodicity is approximately 0.25 lambda o and the total structure thickness is 0.012 lambda o (approximate to lambda o/77), which is well below lambda o/10, thereby confirming the ultra-thin nature of the proposed structure. The metasurface absorber achieves absorption levels exceeding 90% at 3.8, 5.4, 8, 9.7, 14.7, 17.6, 18.8, 20.6, 21.2, and 24.35 GHz in the S, C, X, Ku, and K bands. The maximum absorption occurs at 24.35 GHz with a quality factor of 243.5, indicating suitability for both radar cross-section (RCS) reduction and sensing applications. Monostatic RCS analysis demon strates more than 7 dBsm reduction at the absorption frequencies. The structure exhibits polarization-insensitive behavior under normal incidence and maintains absorption above 80% for oblique incidence angles up to 45 degrees. An equivalent circuit model developed in Advanced Design System (ADS), along with experimental vali dation using a fabricated prototype and Vector Network Analyzer (VNA) measurements, shows strong agreement with simulation results, confirming the accuracy and validity of the proposed metasurface absorber.

Dergi

OPTICS AND LASER TECHNOLOGY

Yıl

2026

Cilt

199

ISSN

0030-3992

eISSN

1879-2545

DOI

10.1016/j.optlastec.2026.115001

WoS UID

WOS:001703007900001