Modification of Radiation Patterns of First Harmonic Mode of Slot Dipole for Dual-Frequency Operation

The effect of parasitic slots on the radiation patterns of the first harmonic mode of a coplanar waveguide-fed slot dipole antenna is presented. By adding four parasitic slots, two on each of the two arms of the slot dipole, the radiation patterns of the first harmonic mode of the slot dipole can be modified to be similar to those of its fundamental mode, while the performance of the fundamental mode is retained. Therefore, the antenna would operate as a dual-band operator with similar radiation patterns. Details of the design and measured and simulated results are presented and discussed.