Abstract
This paper presents a study on a dual port antenna with wide and narrowband functionality. The proposed structure incorporates two antennas into a single substrate by sharing same ground plane. In this structure, two ports are used. One port is used for wideband function that works from 1 to 3.7 GHz. The other one is used for reconfigurable narrowband operation, which supports single, dual and triple-band modes. Reconfiguration of the narrowband antenna is achieved by means of PIN diode switches. The single-band operates at 2 GHz. The dual-band provides two center frequencies at 1.8 GHz and 2.4 GHz, while the triple-band operates at 1.4, 1.8, and 2.6 GHz. The coupling between the two ports is signified by the S12 and S21 parameters. The coupling is below -10dB across the full operating range of the antenna measured in S12 and S21 parameter. These features are potentially useful for Cognitive Radio systems.
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