Open AccessHybrid spoof surface plasmon polariton and substrate integrated waveguide bandpass filter with high out‐of‐band rejection for X‐band applications
Author(s) -
Sangam Ramanand Sagar,
Kshetrimayum Rakhesh Singh
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12049
Subject(s) - band pass filter , surface plasmon polariton , passband , materials science , waveguide , optics , insertion loss , optoelectronics , filter (signal processing) , rectangle , stopband , prototype filter , plasmon , surface plasmon , physics , filter design , electrical engineering , engineering , mathematics , geometry
Two bandpass filters based on hybrid spoof surface plasmon polariton (SSPP) and substrate integrated waveguide (SIW) are presented for X‐band applications, herein. The dispersion and transmission characteristics of the proposed hybrid SSPP‐SIW structures are analysed, and the influence on the variation of their structural parameters is investigated. The proposed dumbbell‐shaped SSPP shows more slow‐wave effects than the rectangle‐shaped SSPP for the same height of grooves, and hence could be a good choice in the design of compact, low loss and highly integrated microwave and terahertz devices. The lower and upper cut‐off frequencies of hybrid SSPP‐SIW bandpass filters can be adjusted independently by varying the structural parameters of SIW and SSPP units, respectively. The proposed two filters exhibit excellent passband (8–13.15 GHz for filter I and 8–13.5 GHz for filter II) and wide upper‐band rejection (>42.5 dB from 14.1 to 20 GHz for filter I and >41 dB from 14.2 to 19.5 GHz for filter II) simultaneously. Their size is very compact, amounts to only about 1 λ g × 0.7 λ g , where λ g is the guided wavelength in the SIW at the centre frequency.