Wide Beamwidth and High Gain Reflection Pattern Design Method for Intelligent Reflecting Surface

The Intelligent reflecting surface (IRS) has recently been attracting attention as a solution for coverage hole problems in mobile communication areas. Since the reflection range of the IRS depends on each direction and beamwidth of the IRS, the half-power beamwidth (HPBW) becomes an important param...

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Bibliographic Details
Main Authors: Matsuno, Hiromi, Ohto, Takuya, Hayashi, Takahiro, Okita, Mitsutaka, Suzuki, Daiichi, Matsunaga, Kazuki, Oka, Shinichiro
Format: Conference Proceeding
Language:English
Subjects:
Design methodology
half-power beamwidth
Intelligent reflecting surface
Interference
measurement results
Mobile communication
Numerical analysis
Optimization methods
Power measurement
reflection pattern design
Surface waves
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Summary:The Intelligent reflecting surface (IRS) has recently been attracting attention as a solution for coverage hole problems in mobile communication areas. Since the reflection range of the IRS depends on each direction and beamwidth of the IRS, the half-power beamwidth (HPBW) becomes an important parameter to reflect signals to user equipment widely distributed in the coverage hole. On the other hand, the reflection power decreases as the HPBW increases. Therefore, the design of the reflection pattern with appropriate HPBW is important to reflect sufficient signals to the desired range. Although the conventional reflection pattern design method, which divides the IRS into sub-IRSs with different reflection directions and synthesizes each reflection power, achieves a wide beamwidth of IRS, the reflection power is decreased due to the interference between the reflection power of each sub-IRS. In addition, the relationship between the HPBW and the reflection direction of each sub-IRS is not clarified. To solve this problem, we (1) propose the reflection phase optimization method to avoid the interference of each sub-IRS. We also (2) derive the relationship between the reflection HPBW and the gain of IRS. We (3) verify the validity of the proposed method through numerical analysis. In addition, we (4) verify that the proposed method achieves wide HPBW with high gain through experimental analysis. As the results show, the proposed method achieves about 1 dB reflection power enhancement. In addition, the proposed method can achieve HPBW up to 40 degrees of the IRS with the size of 50 wavelengths.
ISSN:1558-2612
DOI:10.1109/WCNC55385.2023.10118905