Narrow Band Rejection in Ultra Wideband Pixel Antennas

In order to meet the growing demand for new services, airborne or satellite platforms must integrate more and more radio systems while the space available for the integration of these elements is increasingly reduced. Particularly, the use of ultra wideband (UWB) Radar, Electronic Warfare devices or wide band telecommunication systems increases the difficulty to share the allowed frequency band on a platform. Then, the introduction of a narrow forbidden band in these UWB structures is a challenge today. This narrow band can be used for localization, voice, internet, communications using for example another antenna located nearby on the platform, but also inside the UWB antenna itself building a Multifunction Antenna. Agile Radiating Matrix Antennas (ARMA) (Fig1) built with wide band pixels are a good candidate to perform this multi-functionality as shown in this paper.