A novel hexagonal dual-mode inductance-loaded filter with four transmission zeros is presented. The technique of utilising inductive sourceload coupling introduces four transmission zeros to provide high selectivity. Then, a bandpass filter is designed, fabricated and tested. Both simulated and measured results are presented.

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A novel triple‐mode square loop microstrip filter with capacitive open stubs and source‐load coupling is proposed.The filter has three controllable transmission zeros near its passband, and exhibits sharp skirt property. The bandpass filter is fabricated and measured. Both simulated and measured results are in agreement. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2403–2406, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26278

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