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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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This article presents a systematic methodology to aid design a low-cost patch antenna for RFID readers. The geometric antenna parameters are found using multiobjective optimization for return loss minimization and gain maximization. To assess the use of low-cost FR-4 substrate the radiation efficiency has been investigated using software simulations. A prototype antenna was built and its parameters were measured in the anechoic chamber. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:905-908, 2016; View this article online at wileyonlinelibrary.com.ABSTRACT: An 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 6908 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. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:908-911, 2016; View this article online at wileyonlinelibrary.com.