Microstrip dual-band bandpass and bandstop filters



In this letter, simple and effective design of dual-band bandpass and bandstop filters using microstrip open-loop resonators is proposed.The dual-band bandpass and bandstop filters developed in this letter exhibit dual operating frequencies that are not integral multiples of each other and are realized using a simple method rather than using the extensive method of extracting coupling coefficient matrix for designing dual-band filters. Parametric analysis is performed on the proposed microstrip structures to determine the optimum dimensions of the dual-band filters. Both simulation and measured results are presented in this letter, and good agreement is obtained between the results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:168–171, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26469