Open AccessHIS‐based bandpass filter with improved upper‐stopband performance
Author(s) -
Qiao Haidong,
Guo Dalu,
Mou Jinchao,
Li Mingxun,
Ma Zhaohui,
Lv Xin
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.4836
Subject(s) - stopband , passband , elliptic filter , ground plane , band pass filter , transition band , resonator , materials science , microstrip , spurious relationship , bandwidth (computing) , acoustics , band stop filter , electronic engineering , optoelectronics , physics , prototype filter , optics , computer science , engineering , low pass filter , telecommunications , antenna (radio) , machine learning
A bandpass filter (BPF) with improved upper‐stopband performance has been studied and implemented with the aid of a ground plane based on high impedance structures (HIS). The microstrip structure of the filter on the top layer consists of three‐order cascaded cross‐shaped resonators loaded by folded split ring slots. The ground plane contains two groups of 2 × 5 lattice metallic mushroom array, showing high impedance at the spurious band so that the upper‐stopband bandwidth of the BPF can be effectively broadened. The HIS‐based ground can independently control the stopband without affecting passband performance. Experimental results demonstrate that the BPF exhibits an extremely broad stopband region from 15.5 to 49.2 GHz with a rejection level above 20 dB.