volume | PIER Journals

Abstract

A method aiming to widen the upper stopband in a microwave bandpass filter based on two-conductor suspended-substrate stripline resonators is described in this letter. Applicability of the method is illustrated by simulating and fabricating fourth-order filter that has a very wide upper stopband: Δf_stop/f₀=7.92 measured at a level -50 dB, which is achieved because the widths of the inner resonators in the structure are 1.4 times greater than that of the outer ones.

1. Crute, J. R. and L. E. Davis, "A compact microstrip interdigital stepped-impedance band-pass filter with enhanced stop band," Microwave and Opt. Technol. Lett., Vol. 34, No. 5, 336-340, 2002.
doi:10.1002/mop.10455

2. Chu, P., W. Hong, L. Dai, H. Tang, Z. Hao, J. Chen, and K. Wu, "An ultra-wide stopband microstrip bandpass filter," Microwave and Opt. Technol. Lett., Vol. 52, 2218-2221, 2010.

3. Lin, S.-C., P.-H. Deng, Y.-S. Lin, C.-H. Wang, and C. H. Chen, "Wide-stopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 3, 1011-1018, 2006.
doi:10.1109/TMTT.2005.864139

4. Garcıa-Garcıa, J., F. Martın, F. Falcone, J. Bonache, I. Gil, T. Lopetegi, M. A. G. Laso, M. Sorolla, and R. Marques, "Spurious passband suppression in microstrip coupled line band pass filters by means of split ring resonators," IEEE Microwave and Wireless Component Letters, Vol. 14, No. 2, 416-418, 2004.
doi:10.1109/LMWC.2004.832066

5. Kim, C. H. and K. Chang, "Wide-stopband bandpass filters using asymmetric stepped-impedance resonators," IEEE Microwave and Wireless Component Letters, Vol. 23, No. 2, 69-71, 2013.
doi:10.1109/LMWC.2012.2236885

6. Russian patent 2237320, published , 2004.

7. Leksikov, A. A. and F. G. Sukhin, "Stripline double-wire resonator on suspended substrate," Transactions of 16th Int. Conference “Microwave & Telecommunication Technology” (CriMiCo’2006) Sevastopol, 564-565, Crimea, Ukraine, 2006.

8. Belyaev, B. A., A. M. Serzhantov, and A. A. Leksikov, "Analysis of the coupling coefficients of stripline resonators in the designs of suspended substrate filters," Journal of Communications Technology and Electronics, Vol. 55, No. 12, 1330-1339, 2010.
doi:10.1134/S1064226910120028

9. Belyaev, B. A., A. A. Leksikov, A. M. Serzhantov, and V. V. Tyurnev, "Miniature suspendedssubstrate bandpass filter," Progress In Electromagnetics Research C, Vol. 15, 219-231, 2010.
doi:10.2528/PIERC10070604

10. Zhang, Yu., K. A. Zaki, A. J. Piloto, and J. Tallo, "Miniature broadband bandpass filters using double-layer coupled stripline resonators," IEEE Transaction on Microwave Theory and Techniques, Vol. 54, No. 8, 3370-3377, 2006.
doi:10.1109/TMTT.2006.879176

Dr. Aleksandr Leksikov

Dr. Alexey Mikhailovich Serzhantov

Dr. Iliya Valerievich Govorun

Dr. Aleksey Olegovich Afonin

Dr. Andrey Vitalievich Ugryumov

Dr. Andrey Leksikov