Abstract
AbstractA novel dual‐band microstrip bandpass filter with multiple transmission zeros has been proposed in this article. Dual‐band resonators composed of one shunt short‐circuited stub and one shunt open‐circuited stub are connected by dual‐band admittance inverters (J‐inverters) to create dual‐passband responses. The three transmission zeros brought by the resonator plus the transmission zero resulted from the inverter will produce sharp attenuations near the passbands, and large isolations between the passbands. Design formulas of this type of filters are also provided in detail. To verify the presented concept, a filter with a dual‐band response has been designed and fabricated with microstrip technology. The measured results are in good agreement with the full‐wave simulation results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2874–2877, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23861
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