Ultra-Wideband Balanced Band-Pass Filter Using Spoof Surface Plasmon Polaritons
Published in 2025 IEEE 8th International Symposium on Electromagnetic Compatibility (ISEMC), 2025
An ultra-wideband balanced band-pass filter (BPF) is proposed based on the spoof surface plasmon polaritons (SSPPs). Firstly, a I-shaped microstrip SSPP structure is proposed for introducing the upper cut-off frequency and achieving compact size. Then, a microstrip-to-slotline (MTS) transition feeding structure is used to introducing lower cut-off frequency, and an ultra-wideband balanced BPF is fabricated and measured. For differential mode (DM) operation, a filtering response with center frequency of 2.4 GHz and 3-dB fractional bandwidth of 116% is achieved. For common mode (CM) operation, the in-band CM suppression level is above 30 dB. The ultra-wideband balanced BPF shows controllable bandwidth and high CM suppression level.
Citation: Y. Song, Q. Yang, M. Zhao, H. Yuan, G. Liu, and A. Zhang, "Ultra-wideband balanced band-pass filter Using spoof surface plasmon polaritons," 2025 IEEE 8th International Symposium on Electromagnetic Compatibility (ISEMC), Hefei, China, 2025, pp. 1-3.
