서강대학교

초록 (요약문)

In this paper, a broadband low-loss and high isolation Double-Strip Spoof Surface Plasmon Polariton (DS SSPP) transmission line is designed and fabricated at 0.1-40.0 GHz which is applicable to high-speed interconnect technology, and DS SSPP ring resonator with high-quality factors than microstrip ring resonator is designed and fabricated. When transmission lines such as conventional microstrip lines and stripline were miniatured for high-performance, high-speed interconnect, the distance between transmission lines becomes shorter, resulting in signal interference due to crosstalk, which causes performance degradation such as increased insertion loss and reduced isolation. Therefore, in this study, a transmission line using SPP was proposed to suppress interference due to crosstalk. Since a ground plane is required for interconnects, and impedance matching is essential, a DS SSPP structure in which periodic structures exist symmetrically around the dielectric substrate has been designed. To reduce radiation loss that has a great effect on insertion loss and isolation properties in high frequency, the DS SSPP was designed in T-shaped, not a simple rectangular shape, so that the coupling with adjacent cells and ground metal could be stronger. Through this, radiation loss could be reduced by attenuating the signal radiated into the air and having strong field confinement properties. Using DS SSPP’s strong field confinement property, a DS SSPP ring resonator with high-quality factors by reduced radiation loss is designed. The fabricated DS SSPP coupled transmission lines showed an average improvement in insertion loss of 1.4 dB in the 20.0-38.0 GHz, and an average improvement in isolation of 13.8 dB in the 6.5-38.0 GHz compared to the microstrip line. In addition, better insertion loss and isolation properties were shown than microstrip lines at various coupling gaps. The fabricated DS SSPP ring resonator showed higher quality factors at fundamental and second harmonic resonant frequencies than the microstrip ring resonator.