Design Wideband Differential Bandpass Filter Using Slotline Surface Plasmon Polaritons

IEEE Access

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 (S₂₁^dd <; -30 dB), and a wide 40-dB CM suppression from 0.1 to 20 GHz.

【 授权许可】

Unknown