A Pattern-Frequency-Dependent Wide-Band Slot Antenna

A new design for a coplanar waveguide (CPW)-fed wide-band slot antenna is presented in this letter. The basis for achieving such a broadband operation is to create a multiresonator in a slot cavity. By using a modified fork-like feeding structure, several different equivalent magnetic current paths are alternatively excited when the operated frequency is changed. Due to different radiation regions, the radiation pattern, including the end-fire or bore-sight direction, changes frequency-dependently. A 220% impedance bandwidth (S
₁₁
< -10dB) is demonstrated. Simulated and measured results of the antenna are presented.