Planar four-element frequency agile MIMO antenna system with chassis mode reconfigurability

In this work, a novel multiband, four-element, mean- dered-line reconfigurable planar F-shaped multiple-input-multiple-output antenna is presented. The proposed design includes chassis mode recon- figurability option as well. A combination of PIN and varactor diodes is used to achieve the frequency tuning over a wide-band. The proposed design covers several well-known frequency bands between 0.7 and 3 GHz. The design is compact and realized on a single commercial sub- strate board with dimensions 65 3 120 3 1.56 mm 3 that can be used in small wireless handheld devices for cognitive radio applications. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1933-1938, 2015; View this article online at wileyonlinelibrary.com. DOI 10.1002/ mop.29218

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