A bandpass filter (BPF) using CPW combined with microstrip is proposed. The target BPF is composed of two element filters built from combined CPW and microstrip structure. The design of element filter is based on the lumped elements approach with each circuit component built from a CPW or microstrip. In the circuit model, transmission zeros are created by the passband edges to enhance the signal selectivity. The element filter's characteristics are analyzed by the lumped L-C circuit model. Experiment is conducted, and a good agreement is observed between the measurement and simulation.
2. Zhu, L. and K. Wu, "Characterization of finite-ground CPW reactive series-connected elements for innovative design of uniplanar M(H) MICs," IEEE Trans. Microwave Theory Tech., Vol. 50, No. 2, 549-557, Feb. 2002.
doi:10.1109/22.982234
3. Martin, F., F. Falcone, J. Bonache, T. Lopetegi, M. A. G. Laso, and M. Sorolla, "New periodic-loaded electromagnetic bandgap coplanar waveguide with complete spurious passband suppression," IEEE Microw. Wireless Compon. Lett., Vol. 12, No. 11, 435-437, Nov. 2002.
doi:10.1109/LMWC.2002.805536
4. Williams, D. F. and S. E. Schwarz, "Design and performance of coplanar waveguide band-pass filters," IEEE Trans. Microwave Theory Tech., Vol. 31, No. 7, 558-566, Jul. 1983.
doi:10.1109/TMTT.1983.1131545
5. Lin, F.-L., C.-W. Chiu, and R.-B. Wu, "Coplanar waveguide bandpass filter --- A ribbon-of-brick-wall design," IEEE Trans. Microwave Theory Tech., Vol. 43, No. 7, 1589-1596, Jul. 1995.
6. Nguyen, C., "Broadside-coupled coplanar waveguides and their end-coupled band-pass filter applications," IEEE Trans. Microwave Theory Tech., Vol. 40, No. 12, 2181-2189, Dec. 1992.
doi:10.1109/22.179879
7. Wu, M.-S., Y.-Z. Chueh, J.-C. Yeh, and S.-G. Mao, "Synthesis of triple-band and quad-band bandpass filters using lumped-element coplanar waveguide resonators," Progress In Electromagnetics Research B, Vol. 13, 433-451, 2009.
doi:10.2528/PIERB09021302
8. Hong, J.-S. and M. J. Lancaster, Microstrip Filter for RF/Microwave Applications, Wiley, N.Y., 2001.
doi:10.1002/0471221619.ch12
9. Matsunaga, M., M. Katayama, and K. Yasumoto, "Coupled-mode analysis of line parameters of coupled microstrip lines," Progress In Electromagnetics Research, Vol. 24, 1-17, 1999.
doi:10.2528/PIER99032902
10. Niu, J.-X., X.-L. Zhou, and L.-S.Wu, "Analysis and application of novel structures based on split ring resonators and coupled lines," Progress In Electromagnetics Research, Vol. 75, 153-162, 2007.
doi:10.2528/PIER07060101
11., HFSS ver. 8.5, Ansoft, PA, 2000.
12. Bahl, I. and P. Bhartia, Microwave Solid State Circuit Design, 2 Ed., No. 6, John Wiley & Sons, N.Y., 2003.
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