Modified short‐circuit quarter‐wavelength resonators for the design of microstrip dual‐passband bandpass filter

In this article, a novel microstrip dual‐passband bandpass filter has been proposed and developed. This filter is composed of two modified short‐circuit quarter‐wavelength resonators with a half‐wavelength stepped‐impedance resonator. Design procedures and theoretical analysis are provided; the prototypical bandpass filter with dual passbands is fabricated and measured as well. Well matched simulated results and experimental data validate the proposed filter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 3026–3029, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24811