A dual-port antenna for wide and narrowband applications

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. © 2015,penerbit utm press. all rights reserved.