Abstract
AbstractConventional electromagnetic crystals or electromagnetic bandgaps (EBGs) with uniform distribution show spurious ripples in the pass band and poor stop‐band responses. This paper presents a detailed theoretical investigation of the performance of EBGs on a uniplanar transmission line using tapered distribution. The nonuniform size of the EBGs is used to improve the ripple height, 20‐dB rejection band, and selectivity of the filter over the pass‐band and stop‐band regions. The calculated S parameters exhibit significant improvement in ripple height and rejection bandwidth, as compared with the conventional EBG‐assisted coplanar transmission line. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 128–131, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20228
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