Abstract
ABSTRACTAn extremely wideband (EWB) microstrip antenna is presented that is designed with band rejection characteristics at C and WLAN bands. This is achieved by embedding inside the inverted triangular shaped patch a pair of L‐shaped slits that have been rotated by ±90° so that they are horizontal and downward facing, and topping the patch with an arrow‐shaped strip. The feedline to the patch also needs to be backed with a trapezoid shaped ground‐plane. The center frequency of the notched bands can be easily controlled by altering the parameters of the slits and arrow‐shaped strip. The low‐profile antenna essentially radiates omni‐directionally and has a measured impedance bandwidth of 18.9 GHz (2.9–21.8 GHz) with a VSWR ≤ 2, except at the two rejection bands. The antenna has an average gain > 3 dBi. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:908–911, 2016
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