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A Broad Dual-Band Bandpass Filter Design Based on Double-Layered Spoof Surface Plasmon Polaritons
| Content Provider | MDPI |
|---|---|
| Author | Liu, Lingyun Liu, Yun Jin, Xiaohua Li, Zhuo Tian, Yubo |
| Copyright Year | 2022 |
| Description | In this work, a broad dual-band bandpass filter is designed by applying double-layered spoof surface plasmon polaritons (DLSSPPs) as the main transmission line (MTL) and loading combined-stub dual-mode resonators (CSDMRs) onto the MTL with certain spaces. Each CSDMR consists of an open stub and a short stub that are connected in parallel. Efficient mode conversion between the quasi-transverse electromagnetic waves in the microstrip line and the spoof surface plasmon polaritons (SSPPs) on the double-layered surface plasmon waveguide is realized using gradient double-layered metal gratings and via the sector structure impedance matching technique. A parametric study of the CSDMR demonstrates that center frequencies and bandwidths can be controlled by varying the stub lengths and widths of the CSDMRs. A second-order dual-band filter is designed and fabricated, and simulated and experimental S-parameters agree well. A lower loss of the passband is achieved compared with the filters that apply single-layered SSPPs. The space between two CSDMRs is shortened because of the slow-wave effect of the DLSSPPs. The lowpass performance of the DLSSPPs exhibits good rejection from the cutoff frequency above. |
| Starting Page | 697 |
| e-ISSN | 20799292 |
| DOI | 10.3390/electronics11050697 |
| Journal | Electronics |
| Issue Number | 5 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-24 |
| Access Restriction | Open |
| Subject Keyword | Electronics Telecommunications Broad Dual-band Bandpass Filter Double-layered Plasmon Waveguide Double-layered Spoof Surface Plasmon Polaritons Mode Conversion |
| Content Type | Text |
| Resource Type | Article |
