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Abstract
A compact microstrip dual-band bandpass filter with multiple transmission zeros is proposed. This filter is composed of input/output (I/O) coupling structure with source-load cross-coupling and two pairs of short-ended resonators resonating at 2.4 and 5.8 GHz, respectively. By proper arrangement of the I/O coupling structure with source-load cross-coupling, multiple transmission zeros are introduced. In this way, high selectivity of both passbands and good out-band rejection level better than 20 dB up to 9 GHz are achieved. Good agreement can be found between the full-wave electromagnetic simulations and measured results, which verifies the proposed design concept.
Acknowledgments
This work was supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant 20110185120008 20120185130001, and the Fundamental Research Funds for the Central Universities under Grant ZYGX2012J043.