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This paper presents a planar ultra-wide band (UWB) sensing antenna accompanied with a monopole narrow band communicating antenna for interweave cognitive radio (CR) applications. daftar demo slot The UWB antenna bandwidth covers the entire band specified for UWB applications (3. juara 28 slot login 1–10 6 GHz) In addition to the varactor diode, a PIN diode is attached to the communicating antenna to expand the continuous