Abstract
A new model for accurate calculation of the coupling coefficient between two degenerate modes (in dual-mode filters) or two resonators in standard filters is presented, validated, and compared with the standard model through simulation and test. New filter geometries are devised and investigated in order to improve the narrowband performance. Smaller resonator separation is achieved by moving the portions with current peaks in adjacent resonators away from the coupling region and hence bringing the resonators closer. This is a crucial issue for compactness. Two new microstrip filters with FBW values of 0.02% and 0.14% are demonstrated and compared with two others previously reported using this notion. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 180–185, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21118
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