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The study of a planar circular slot antenna for Ultrawideband (UWB) communications is presented. The integration on this antenna of a notch fllter, to reduce the possible interferences with the 5GHz WLAN communications, has been discussed in detail. Four difierent structures, achieved by etching a suitable pattern on the antenna circular stub, have been considered, and their features have been compared. The antenna with symmetrical and inverted-L cuts shows the best performance, and it has been therefore realized and fully characterized. It shows very good matching features over the UWB band, and notable rejection of the 5GHz WLAN band.

UWB CIRCULAR SLOT ANTENNA PROVIDED WITH AN INVERTED-L NOTCH FILTER FOR THE 5 GHz WLAN BAND