Dual Slot Multiband Microstrip Antenna for Pattern and Frequency Agility

This work describes an improved rectangular microstrip antenna that can produce numerous frequency narrow bands in both frequency and pattern reconfigurable modes of operation. Two PIN diodes are inserted in the slots created within the patch and the resulting parasitic elements to produce four cases based on the active diode(s). A slot is also created within each parasitic element for introducing different radiation patterns when the associated diode is active. The reported antenna can toggle between single band to dual, triple, and quad frequency bands for the four diodes combinations. Reflection coefficients and radiation patterns are mainly investigated to show the intended operation of the designed antenna.