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This paper presents a new small-size microstrip-fed UWB (ultra wideband) planar monopole antenna with band notch properties. The presented antenna comprises of trapezoid shape with tapered end radiating patch and a 50Ω microstrip line that are etched on the upper surface of the FR-4 substrate whereas the ground plane is etched on the bottom surface of the substrate. The antenna covers the UWB frequency...
This paper presents an efficient beamforming technique for secondary cognitive radio network deployed in the coverage region of a cellular network. In cognitive network, it must be ensured that secondary users (SUs) do not cause any harmful interference to the primary users (PUs). To keep this in mind, we have formulated a new beamforming problem for the secondary network considering some new constraints...
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