Abstract
ABSTRACTA single‐layer differential coplanar waveguide (CPW) fed antenna is proposed for common‐mode suppressed and WLAN band notched ultra‐wideband (UWB) applications. The UWB nature is generated by the stepped slot radiators and a pair of differential stepped CPW feeding lines. When two ports of the antenna are fed with common‐mode signals, the radiator cannot be excited and common‐mode suppression is obtained. Moreover, a pair of U‐shaped slits and stubs are etched on the CPW lines and stepped slots to earn a notch band characteristic. Then, to validate the presented antenna, a prototype antenna is fabricated and tested. The proposed antenna shows experimentally differential reflection coefficients −10 dB bandwidth of 122.6% (2.54 − 10.6 GHz). A measured band notch at 5.1–5.9 GHz for WLAN band is also obtained. Moreover, the common‐mode suppression within the operating band better than 1.5 dB is achieved. All the results show that the proposed antenna can be widely used in UWB wireless communication systems, medical imaging systems and vehicular radars. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:73–77, 2017
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