volume | PIER Journals

Abstract

This paper proposes a miniature microwave bandpass filter. It comprises quasi-lumped suspended substrate stripline resonators of a new type. Their common substrate consists of two contiguous dielectric layers. Every resonator in the filter has three parallel strip conductors. Two of them are placed on the outer substrate surfaces and the rest is placed inside the substrate. The filter of the sixth order was designed with the use of special optimization rules that are universal for all resonator filters. The substrate of the fabricated filter was made of RT/Duroid 5880 (ε_r = 2.2, tan δ =0.002) with thickness of 0.127 mm. It has dimensions of 12 mm x 45.5 mm. The measured passband has a center frequency of 1.01 GHz, 3-dB fractional bandwidth of 11%, and minimum insertion loss of 1.4 dB. The 100-dB upper stopband extends up to 10.5 GHz.

1. Chen, Y.-M., S.-F. Chang, C.-C. Chang, and T.-J. Hung, "Design of stepped-impedance combline bandpass filters with symmetric insertion-loss response and wide stopband range," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 10, 2191-2199, 2007.
doi:10.1109/TMTT.2007.906482 Google Scholar

2. Belyaev, B. A., S. V. Butakov, N. V. Laletin, A. A. Leksikov, V. V. Tyurnev, and O. N. Chesnokov, "Selective features of microstrip filters based on irregular resonators," J. Commun. Technol. Electron., Vol. 49, No. 11, 1308-1316, 2004. Google Scholar

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 Trans. Microw. Theory Tech., Vol. 54, No. 3, 1011-1017, 2006.
doi:10.1109/TMTT.2005.864139 Google Scholar

4. Kuo, J.-T. and E. Shih, "Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth," IEEE Trans. Microw. Theory Tech., Vol. 51, No. 5, 1554-1559, 2003.
doi:10.1109/TMTT.2003.810138 Google Scholar

5. Kuo, T.-N., W.-C. Li, C.-H. Wang, and C. H. Chen, "Wide-stopband microstrip bandpass filters using quarter-wavelength stepped impedance resonators and bandstop embedded resonators," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 6, 389-391, 2008.
doi:10.1109/LMWC.2008.922609 Google Scholar

6. Kuo, J.-T., S.-P. Chen, and M. Jiang, "Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses," IEEE Microw. Wireless Compon. Lett., Vol. 13, No. 10, 440-442, 2003.
doi:10.1109/LMWC.2003.818531 Google Scholar

7. Sanchez-Soriano, M. A., G. Torregrosa-Penalva, and E. Bronchalo, "Multispurious suppression in parallel-coupled line filters by means of coupling control," IET Microw. Antennas Propag., Vol. 6, No. 11, 1269-1276, 2012.
doi:10.1049/iet-map.2012.0248 Google Scholar

8. Belyaev, B. A., N. V. Laletin, A. A. Leksikov, and A. M. Serzhantov, "Peculiarities of coupling coefficients of a regular microstrip resonator," J. Commun. Technol. Electron., Vol. 48, No. 1, 31-38, 2003. Google Scholar

9. Belyaev, B. A., A. M. Serzhantov, V. V. Tyurnev, and A. A. Leksikov, "Miniature bandpass filter with a wide stopband up to 40f₀," Microwave Opt. Technol. Lett., Vol. 54, No. 5, 1117-1118, 2012.
doi:10.1002/mop.26751 Google Scholar

10. Belyaev, B. A., A. M. Serzhantov, V. V. Tyurnev, A. A. Leksikov, and A. A. Leksikov, "Miniature coaxial resonator and related bandpass filter with ultra-wide stopband," Tech. Phys. Lett., Vol. 38, No. 1, 47-50, 2012.
doi:10.1134/S106378501201004X Google Scholar

11. Belyaev, B. A., A. M. Serzhantov, V. V. Tyurnev, A. A. Leksikov, and Y. F. Bal'va, "Miniature bandpass microwave filter with interference suppression by more than 100 dB in a wide rejection band," Tech. Phys. Lett., Vol. 39, No. 8, 690-693, 2013.
doi:10.1134/S1063785013080026 Google Scholar

12. Belyaev, B. A., A. M. Serzhantov, V. V. Tyurnev, A. A. Leksikov, and Y. F. Bal'va, "Stripline bandpass filter with wide stopband and rejection level up to 100 dB," Microwave Opt. Technol. Lett., Vol. 54, No. 12, 2866-2869, 2013. Google Scholar

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

14. Belyaev, B. A. and V. V. Tyurnev, "The method for microstrip filters parametric synthesis," 16th Int. Crimean Conference ''Microwave and Telecommunication Technology, 517-519, Sevastopol, Ukraine, 2006. Google Scholar

15. Belyaev, B. A., S. V. Butakov, N. V. Laletin, A. A. Leksikov, and V. V. Tyurnev, "Expert system Filtex 32 for computer-aided design of bandpass microstrip filters," 15th Int. Crimean Conference ``Microwave and Telecommunication Technology", 504-505, Sevastopol, Ukraine, 2005. Google Scholar

16. Tyurnev, V. V., "Efficiency comparison of the optimization methods that are used to design microwave filters," VIIIth International Scientific and Practical Conference, 75-76, Kiev, Ukraine, 2011. Google Scholar

17. Belyaev, B. A., A. M. Serzhantov, and A. A. Leksikov, "Analysis of the coupling coefficient of stripline resonators in the designs of suspended-substrate filters," J. Commun. Technol. Electron., Vol. 55, No. 12, 1330-1339, 2010.
doi:10.1134/S1064226910120028 Google Scholar

Dr. Boris Afanasievich Belyaev

Dr. Alexey Mikhailovich Serzhantov

Prof. Vladimir V. Tyurnev

Dr. Yaroslav F. Bal'va

Dr. Aleksandr Leksikov