IEEE Access | |
Design Wideband Differential Bandpass Filter Using Slotline Surface Plasmon Polaritons | |
Baoping Ren1  Haiwen Liu2  Huifeng Ma3  Pin Wen4  Zhengbiao Wang5  Qingfeng Zhang6  | |
[1] Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China;School of Electronic and Information Engineering, Xi&x2019;School of Information Engineering, East China Jiaotong University, Nanchang, China;School of Information Science and Engineering, Southeast University, Nanjing, China;an Jiaotong University, Xi&x2019;an, China; | |
关键词: Surface plasmon polariton (SPP); slotline; common/differential-mode; wideband; filter; | |
DOI : 10.1109/ACCESS.2019.2907124 | |
来源: DOAJ |
【 摘 要 】
In this paper, a novel wideband differential bandpass filter (BPF) with slotline surface plasmon polaritons (SPPs) is proposed. It consists of a pair of differential microstrip-to-slotline transition, a slotline-to-SPP transition with subwavelength gradient grooves, and a slotline SPP waveguide, which supports the TEM, TE, and SPP modes, respectively. The dispersion and transmission characteristics of the proposed hybrid SPP structure are analyzed under differential-mode (DM) and common-mode (CM) operations and applied to design wideband differential filter. To validate the design concept, a filter sample has been designed, fabricated, and measured. Both simulated and measured results prove its good performance including a wide 3-dB fractional bandwidth of 147.6% centered at 4.2 GHz (f0), a wide DM upper stopband to 4.8 f0 (S21dd <; -30 dB), and a wide 40-dB CM suppression from 0.1 to 20 GHz.
【 授权许可】
Unknown