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A compact sixteenth‐mode substrate integrated waveguide bandpass filter with improved out‐of‐band performance
Author(s) -
Azad Amit Ranjan,
Mohan Akhilesh
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30615
Subject(s) - band pass filter , stopband , waveguide filter , waveguide , substrate (aquarium) , filter (signal processing) , materials science , optics , ground plane , optoelectronics , etching (microfabrication) , physics , engineering , prototype filter , low pass filter , electrical engineering , oceanography , geology , layer (electronics) , antenna (radio) , composite material
This article presents a compact sixteenth‐mode substrate integrated waveguide (SMSIW) bandpass filter operating at fundamental mode TM01. The filter size is reduced by introducing SMSIW circular cavity. It occupies only 6.25% of the conventional substrate integrated waveguide (SIW) circular cavity with same resonant frequency. The higher‐order mode TM02 of the circular cavity is suppressed by etching two slots on the ground plane to improve out‐of‐band performance. Measured results show that an out‐of‐band rejection better than 18 dB is obtained from 2.5 GHz to 8 GHz. The in‐band and out‐of‐band performance obtained from simulation and measurement are presented and they are in good agreement. The filter exhibits good stopband performance and compact size.