부산대학교 도서관

In this letter, a structure to reduce the reflection loss in intelligent reflecting surface of liquid crystal (IRS-LC) is proposed. The loss in IRS-LC is analyzed, indicating that the electric field in the liquid crystal (LC) is a primary cause. To address this issue, a structure by introducing a loss suppression structure beneath the LC layer is presented. Theoretical analysis confirms the low reflection loss characteristic of the structure, and a 15 × 15 prototype IRS-LC array is fabricated and measured. Simulated and measurement results show that the proposed IRS-LC has a maximum reflection loss reduction of 11.3 dB, a magnitude variation reduction of 8.5 dB at 40.3 GHz, and a reflection phase range of 204$^\circ$. The results validates the proposed structure in reducing the reflection loss. Furthermore, the proposed IRS-LC structure has the advantages of low cost and easy processing.