Abstract
This paper presents an incident angle$(\boldsymbol{\theta})$insensitive metamaterial absorber (MTMA) operating at 2.45 GHz. De-signed MTMA is based on the proposed unit cell (UC) which has a size of 20-by-20 sq. mm. UC is developed on Rogers RO4350B and employs two half-circular rings connected by a line. It is imperative to note that the considered UC geometry showed a high absorption level for varying$\theta$. In particular, the peak absorption of 99.9% is obtained when$\theta$was changed between 0 and 30 deg. Furthermore, the minimum absorption of 80% was achieved at$\boldsymbol{\theta=70}$deg. Finally, the results reveal that developed MTMA can be utilized in practical scenarios, e.g., for the low-power Internet-of-Things devices charging,