Abstract
AbstractA new miniature microstrip four‐pole bandpass filter using a two‐layer structure with quarter‐wavelength resonators and open stub inverters is proposed. The coupling between the resonators in the two layers is achieved via a slot etched on a common ground plane located between the layers. The open stub inverters are used to increase the selectivity of the filter and to avoid connection to ground plane that is generally required for quarter‐wavelength resonators of bandpass filter. A four‐pole bandpass filter with elliptic‐type performance is designed and tested at 2.45 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1485–1487, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23401
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