Ultra-thin and light-weight spoof surface plasmon polariton coupler achieved by broadside coupled split ring resonators

• 来源期刊: 中国物理B（英文版）
• 关键词: ultra-thin light-weight poof surface plasmon polariton broadside coupling
• 年，卷（期）: 2018,（10）
• 页码范围: 66-72
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/10/100304

摘要

Low profile and light weight are very important for practical applications of a spoof surface plasmon polariton (SSPP) coupler, especially at low frequencies. In this paper, we propose and design an ultra-thin, light-weight SSPP coupler based on broadside coupled split ring resonators (BC-SRRs). The size of BC-SRR can be far less thanλ/100 and can extremely well control the refl ective phases within a subwavelength thickness. Due to the broadside capacitive coupling, the electrical size of BC-SRR is dramatically reduced to guarantee the ultra-thin thickness of the SSPP coupler. The weight of the SSPP coupler is reduced by a low occupation ratio of BC-SRR in the unit cell volume. As an example, a C-band SSPP coupler composed of phase gradient BC-SRRs is designed, fabricated, and measured. Due to the ultra-small size and low occupation ratio of BC-SRRs, the thickness of the coupler isλ/12 and the surface density is only 0.98 kg/m2. Both simulation and experiment results verify that the coupler can achieve high-efficiency SPP coupling at 5.27 GHz under normal incidence.