Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications
This paper presents a low loss and high selective lowpass filter which is implemented using suspended stripline (SSL) technology. The proposed structure is comprised of a 13th order generalized Chebyshev lowpass filter which enjoys integrated waveguide-to-SSL transitions. This filter is designed and...
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Amirkabir University of Technology
2019-12-01
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| Series: | AUT Journal of Electrical Engineering |
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| Online Access: | https://eej.aut.ac.ir/article_3511_d411c7912fab6fb6da5328ec0930e8c9.pdf |
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| author | Seyed Milad Miri Karim Mohammadpour-Aghdam Seyed Omidreza Miri |
| author_facet | Seyed Milad Miri Karim Mohammadpour-Aghdam Seyed Omidreza Miri |
| author_sort | Seyed Milad Miri |
| collection | DOAJ |
| description | This paper presents a low loss and high selective lowpass filter which is implemented using suspended stripline (SSL) technology. The proposed structure is comprised of a 13th order generalized Chebyshev lowpass filter which enjoys integrated waveguide-to-SSL transitions. This filter is designed and fabricated to be used as lowpass channel of a U-band diplexer employed in frontend of a U-band down converter. Designed filter has cut-off frequency of 50 GHz with high performance out-of-band rejection and wide stopband associated with stepped-impedance resonators realized using generalized Chebyshev prototype. Final design of filter is analyzed and optimized using 3D full-wave simulator. Filter circuit is realized on one side of a 0.127 mm-thick TLY5 substrate with dielectric constant of 2.2, which is suspended symmetrically in a waveguide channel with height of 0.961 mm and maximum width of 2 mm. Higher order modes propagation effects on filter performance are investigated to have proper single mode operation. In addition, parametric study of SSL is done to predict probable malfunctioning due to misalignment or other fabrication and packaging errors. Measurement results also are presented to verify performance of filter. The filter displays a maximum passband insertion loss of 2 dB and a return loss of better than 10 dB over the passband. Band-edge steepness reaches over 50 dB at 5 GHz away from cut-off and out-of-band rejection is higher than 45 dB at entire stopband, which are in good agreement with simulation. |
| format | Article |
| id | doaj-art-67d9effc7e3549a09b0b28d8e4863ebf |
| institution | OA Journals |
| issn | 2588-2910 2588-2929 |
| language | English |
| publishDate | 2019-12-01 |
| publisher | Amirkabir University of Technology |
| record_format | Article |
| series | AUT Journal of Electrical Engineering |
| spelling | doaj-art-67d9effc7e3549a09b0b28d8e4863ebf2025-08-20T02:34:56ZengAmirkabir University of TechnologyAUT Journal of Electrical Engineering2588-29102588-29292019-12-0151213113810.22060/eej.2019.16260.52813511Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer ApplicationsSeyed Milad Miri0Karim Mohammadpour-Aghdam1Seyed Omidreza Miri2Communication Department, School of Electrical and Computer Engineering, University of Tehran, Tehran, IranCommunication Department, School of Electrical and Computer Engineering, University of Tehran, Tehran, IranCommunication Department, Alumnus of Electrical and Computer Engineering, Shiraz University, Shiraz, IranThis paper presents a low loss and high selective lowpass filter which is implemented using suspended stripline (SSL) technology. The proposed structure is comprised of a 13th order generalized Chebyshev lowpass filter which enjoys integrated waveguide-to-SSL transitions. This filter is designed and fabricated to be used as lowpass channel of a U-band diplexer employed in frontend of a U-band down converter. Designed filter has cut-off frequency of 50 GHz with high performance out-of-band rejection and wide stopband associated with stepped-impedance resonators realized using generalized Chebyshev prototype. Final design of filter is analyzed and optimized using 3D full-wave simulator. Filter circuit is realized on one side of a 0.127 mm-thick TLY5 substrate with dielectric constant of 2.2, which is suspended symmetrically in a waveguide channel with height of 0.961 mm and maximum width of 2 mm. Higher order modes propagation effects on filter performance are investigated to have proper single mode operation. In addition, parametric study of SSL is done to predict probable malfunctioning due to misalignment or other fabrication and packaging errors. Measurement results also are presented to verify performance of filter. The filter displays a maximum passband insertion loss of 2 dB and a return loss of better than 10 dB over the passband. Band-edge steepness reaches over 50 dB at 5 GHz away from cut-off and out-of-band rejection is higher than 45 dB at entire stopband, which are in good agreement with simulation.https://eej.aut.ac.ir/article_3511_d411c7912fab6fb6da5328ec0930e8c9.pdflowpass filtersuspended striplinegeneralized chebyshevwaveguide-to-ssl transitionu-band diplexer |
| spellingShingle | Seyed Milad Miri Karim Mohammadpour-Aghdam Seyed Omidreza Miri Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications AUT Journal of Electrical Engineering lowpass filter suspended stripline generalized chebyshev waveguide-to-ssl transition u-band diplexer |
| title | Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications |
| title_full | Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications |
| title_fullStr | Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications |
| title_full_unstemmed | Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications |
| title_short | Highly Selective Lowpass Filter with Wide Stopband in Suspended Stripline Technology for Millimeter-wave Diplexer Applications |
| title_sort | highly selective lowpass filter with wide stopband in suspended stripline technology for millimeter wave diplexer applications |
| topic | lowpass filter suspended stripline generalized chebyshev waveguide-to-ssl transition u-band diplexer |
| url | https://eej.aut.ac.ir/article_3511_d411c7912fab6fb6da5328ec0930e8c9.pdf |
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