In this article, a compact narrow-bandpass filter with high selectivity and improved rejection level is presented. For miniaturization,\na pair of double negative (DNG) cells consisting of quasi-planar chiral resonators are cascaded and electrically loaded to a microstrip\ntransmission line; short ended stubs are introduced to expand upper rejection band. The structure is analyzed using equivalent\ncircuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured.The\nmeasured results are in good agreement with the simulated ones. By comparing to other filters in the references, it is shown that the\nproposed filter has the advantage of skirt selectivity and compact size, so it can be integrated more conveniently in modern wireless\ncommunication systems and microwave planar circuits.
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