Planar Coupled UWB Dipole Antenna with Notched Function to Prevent ISM Band from Interference

An UWB dipole antenna comprising of an arbitrary notched band function to prevent ISM band from interference is presented. The proposed dipole antenna demonstrates the UWB operation with an adjustable notched band and is designed on a commercial substrate FR4 having a thickness of 1.6 mm and 4.4 permittivity. Experimental results verify that the proposed antenna achieves a bandwidth covering from 3.1 to 10.6 GHz with VSWR below 2 including the WLAN band notched at the vicinity of 5 GHz, such as the 5.2 GHz band (5150-5350 MHz) and 5.8 GHz band (5725-5875 MHz). The band gain is about 4 dB and sharply decreases about 8 dB to -4 dB for the notched band. This design method offers impressive gain characteristics and can be applied to other frequency bands of interest.