Novel dual-mode filters with two differently structured resonators were designed on Al2O3 ceramic substrates to achieve pattern minimization and better filter properties. The input/output microstrip lines were arranged in a straight line, making the designed filter easy to connect with other RF circuits. To promote a coupling effect between the input/output microstrip lines and the resonator, two additional coupling stubs were used to form modified T-shaped microstrip coupling lines. In a dual-mode filter, adding a perturbation stub could generate two degenerate modes and increased the bandwidth in the desired passband. To achieve this, the type-A dual-mode filter was designed on a square-ring resonator with two perturbation stubs. For the type-B filter, two open stubs, one perturbation patch, and one meandering loop ring resonator were investigated to achieve the same purpose but with a smaller pattern size than type-A. According to simulated results, the proposed filters with optimized parameters exhibited the wide passbands. © 2013 Springer Science+Business Media New York.
CITATION STYLE
Kung, C. Y., Yang, C. F., Hsieh, Y. T., Chang, W. C., Kuo, C. G., & Diao, C. C. (2013). Novel T-shaped non-orthogonal dual-mode band-pass filters with two differently structured resonators. In Lecture Notes in Electrical Engineering (Vol. 234 LNEE, pp. 675–684). https://doi.org/10.1007/978-1-4614-6747-2_78
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