TY - JOUR
T1 - Broadband bandpass filter and filtering power divider with enhanced slow-wave effect, compact size, and wide stopband based on butterfly-shaped spoof SPPs
AU - Moznebi, Ali-Reza
AU - Afrooz, Kambiz
AU - Arsanjani, Arash
PY - 2022/2
Y1 - 2022/2
N2 - This paper introduces butterfly-shaped spoof surface plasmon polaritons (SSPPs) to design a broadband bandpass filter and filtering power divider (FPD) with enhanced slow-wave effect, compact size, and wide stopband. The dispersion and transmission characteristics of the proposed butterfly-shaped SSPP unit-cell are analyzed. It has higher slow-wave features than the conventional rectangle-shaped SSPP unit-cell with same lateral size. Accordingly, compact devices with enlarged confinement of surface waves can be implemented. The proposed filtering structures are realized by etching periodic butterfly grooves on the bottom layer of the substrate and using microstrip-to-slotline transition based on radial stubs. The lower and upper cutoff frequencies of the passband can be adjusted independently by tuning the dimensions of the radial stubs and butterfly grooves, respectively. The designed SSPP bandpass filter and FPD are fabricated. The measured results show a fractional bandwidth of 135.8% and 109.7% with an out-of-band rejection of greater than 31 dB from 6.9 to 18 GHz and 33 dB from 6.6 to 18 GHz for the bandpass filter and FPD, respectively. Moreover, the butterfly-shaped SSPPs achieve a lateral size reduction of about 39% compared to the rectangle-shaped SSPPs. Considering the above advantages, the presented structures provide a highly efficient solution for future telecommunication systems.
AB - This paper introduces butterfly-shaped spoof surface plasmon polaritons (SSPPs) to design a broadband bandpass filter and filtering power divider (FPD) with enhanced slow-wave effect, compact size, and wide stopband. The dispersion and transmission characteristics of the proposed butterfly-shaped SSPP unit-cell are analyzed. It has higher slow-wave features than the conventional rectangle-shaped SSPP unit-cell with same lateral size. Accordingly, compact devices with enlarged confinement of surface waves can be implemented. The proposed filtering structures are realized by etching periodic butterfly grooves on the bottom layer of the substrate and using microstrip-to-slotline transition based on radial stubs. The lower and upper cutoff frequencies of the passband can be adjusted independently by tuning the dimensions of the radial stubs and butterfly grooves, respectively. The designed SSPP bandpass filter and FPD are fabricated. The measured results show a fractional bandwidth of 135.8% and 109.7% with an out-of-band rejection of greater than 31 dB from 6.9 to 18 GHz and 33 dB from 6.6 to 18 GHz for the bandpass filter and FPD, respectively. Moreover, the butterfly-shaped SSPPs achieve a lateral size reduction of about 39% compared to the rectangle-shaped SSPPs. Considering the above advantages, the presented structures provide a highly efficient solution for future telecommunication systems.
KW - Bandpass filter
KW - Broadband
KW - Filtering power divider
KW - High selectivity
KW - Size reduction
KW - Slow-wave effect enhancement
KW - Spoof surface plasmon polariton (SSPP)
KW - Wide stopband
UR - http://dx.doi.org/10.1016/j.aeue.2021.154084
UR - http://www.scopus.com/inward/record.url?scp=85122330517&partnerID=8YFLogxK
U2 - 10.1016/j.aeue.2021.154084
DO - 10.1016/j.aeue.2021.154084
M3 - Article
SN - 1434-8411
VL - 145
JO - AEÜ = International Journal of Electronics and Communications
JF - AEÜ = International Journal of Electronics and Communications
M1 - 154084
ER -