Author： Liu S.-K. Zheng F.-Z.
Publisher： Taylor & Francis Ltd
ISSN： 1569-3937
Source： Journal of Electromagnetic Waves and Applications, Vol.26, Iss.1, 2012-01, pp. : 130-139
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Abstract
A new tri-band bandpass filter (BPF) designed based on two direct-coupled stepped impedance resonators (SIRs) with open stubs is proposed. Firstly, the resonant phenomenon of the stepped impedance resonator with open stubs is discussed. By properly controlling the length ratio of the SIRs and the length ratio of the stub, the center frequencies of the three passbands are respectively designed at 2.49 GHz, 3.60 GHz and 5.62 GHz, corresponding to the WLAN and WiMAX applications. Furthermore, the external quality factor and coupling coefficients are also obtained for the optimum design. Experimental results show good agreement with the simulated ones.
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